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Agilent G2350A Atomic Emission Detector

1. 3 5 min Figure 28 Carbon 193 2 342 Counts 1800 1600 1400 1200 1000 800 600 4 400 4 200 0 T i 0 0 5 1 1 5 2 2 5 3 3 5 min Figure 29 Chlorine 479 Released MAY 2000 G2350A AED Service Manual 51 Counts 8000 7000 6000 5000 4000 2000 1000 3000 1872 2 131 2 342 Ens 1 348 1 993 1 584 1 295 2 615 3 042 3 490 0 0 5 1 1 5 2 2 5 3 5 min Figure 30 Hydrogen 486 Counts 800 600 400 200 1 872 0 0 5 1 1 5 2 2 5 3 5 min Figure 31 Nitrogen 174 Installation Specifications Released MAY 2000 G2350A AED Service Manual 52 Counts 250 200 150 100 50 0 1 874 1 298 1 542 0 5 1 1 5 2 2 5 3 3 5 min Figure 32 Oxygen 171 Counts 1800 1600 1400 1200 1000 800 600 400 200 0 2 028 0 5 1 1 5 2 2 5 3 35 min Figure 33 Phosphorus 178 Installation Specifications Released MAY 2000 G2350A AED Service Manual 53 Installation Specifications Counts 8 8000 7000 6000 5000 4 4000 3000 2000 1000 0 Ji 0 1
2. 57 General maintenance procedures essen enne 57 AED sh tdowri ecu etatis 57 Hazard awareness n 58 High temperature etre nete esee 58 High voltage 24 e etre tee Ret eee ae RR uen 59 MICO WAVES reves e rese Lev eed ev te etur et edu voee ure rere Tung 59 eet edente te e ree 59 PUENTE BASES P 60 Hydrogen rhet eer a de ei eee 60 INSUIAGION 60 Optical Assembly Replaceable components eese sees eene nennen ennt rentrer enne 61 Tools meeded eee or gelo eoe det eoe 61 PPA teet pe irte 62 Spectrometer x ena ea ee 63 Spectrometer assembly 67 Spectrometer bc Ue a iae eere 67 Removing the leris 5 tte tette mete er e ee Ee eet te 68 Cleaning the lens nir eee ie ne doe eet eene deed 69 Lens mount assembly 69 Electronics Replaceable components esses seen eene 70 Tools needed eee eere e ehe eL ea HER fea eene 71 AC nitet ete ettet tet des 71 Replacing the AC board 71 Voltage selection switches 0 0
3. 73 II ME PR 74 High voltage power supply rennen nennen nennen 75 Service display board nennen nennen enne 76 Released MAY 2000 G2350A AED Service Manual Contents Main Board eee terit eret edet ia e IE e EE E FRUI EE FE PESE teen 77 Replacing the main board eee 77 79 E 80 Sparket board nic assente d ae 81 Sparker assembly e eet e e E p nee 81 Sparker PCB assembly esses esee nennen enne nnne 83 Tenton module Ptr egi too viter Ee aoe 83 TSNITION COU arses io ha eas SA elena De ete et ad 84 TTAnSEOEDIer ced tes Ere Per saved Ore EYED 84 Emission Source Replaceable components tones 86 Gas union tote ovem tede ers fee tese Seas ter 87 Tools needed nennen ieii aie ER ee ee eene 87 Special handling notes and Cautions seen 87 Cleaning the 87 Moving the cavity assembly to the service position 91 Replacing other emission source assembly hardware 94 Cavity heater PRT assembly esses enne 95 Dis
4. EPC manifold Figure 15 Gas lines connected to the EPC 3 Connect the three stainless steel lines from the EPC outlet to the corre sponding inlets on the AED side panel 4 Set the EPC gas pressures to the values listed in the Customer Information Sheet provided with your AED If the data is not available set the pres sures to the values given in the table above Released MAY 2000 G2350A AED Service Manual 32 Installation Installing your transfer line Installing your transfer line insulation tube LE dis heated Swagelok fitting and core ferrules 2 Figure 16 Transfer line Note To modify existing GCs you must order G2350A option 320 which includes the oven modification kit the instructions and the tools required to modify the GC oven for AED use Install your transfer line in your 6890 GC as follows 1 Ifthe right cover panel on your 6890 GC was pre drilled at the factory remove the panel and remove the plastic bag which covers the opening Re install the cover panel If your 6890 GC contains a round knock out on the right panel for the transfer line remove the knock out Figure 17 Removing the knock out 2 Ensure oven insulation has been removed from the transfer line through holes in the GC and that the mounting bracket is installed in the GC oven See Figure 18 Released MAY 2000 G2350A AED Service Manual 33 Installation Installing your transfer line Br
5. 223 Main board part no G2350 60015 224 Main harness cable assembly part no G2350 60680 230 PDA to main PCB cable assembly part no G2350 60860 233 Service display board cable part no 05921 60710 234 Sparker assembly cable part no 05921 61000 234 Sparker board part no 05921 60030 236 Water board part no G2350 60080 _ 237 Water board part no G2350 60085 239 Water drawer control cable assembly Dart no 2350 00 DU Lupe t rt 240 Water drawer control cable assembly part rio 62350 00755 2 iret HR e RR Ad 242 Wires water board to flow sensor and pump 243 Released MAY 2000 G2350A AED Service Manual 209 Internal cabling diagram Cabling Diagrams and Pinouts Internal cabling diagram Figure 139 below is a simplified wiring diagram showing all of the wires and harnesses used in the G2350A AED Following it are pinouts listings for each of the cables or wires All AED board pinouts are listed after the pinouts for the cables main board 5 J251 J252 P500 P101 P100 L 10 solenoid PDA service display solenoid solenoid solenoid board 4 board
6. EE put ae 009 Main board part 62350 60015 Figure 147 Main board 224 vice Manua G2350A AED Ser Released MAY 2000 Connector J251 main board to PDA Cabling Diagrams and Pinouts Main board part no G2350 60015 Pin Function Pin X Function Pin Function 1 GND 15 2 29 PH2 2 PGA OUT 16 GND 30 GND 3 GND 17 31 PH1 4 GND 18 GND 32 GND 5 CAL REF 19 CALO 33 ASUB 6 15 20 GND 34 GND 7 15 21 GAIN2 35 8 15 22 GND 36 GND 9 15 23 GAINI 37 10 15 24 GND 38 GND 11 15 25 GAINO 39 HBW 12 GND 26 GND 40 GND 13 CALEN 27 STRT 14 GND 28 GND Connector J252 PRT circuit Pin Function J252 1 Cavity PRT J252 2 Cavity PRT GND S J252 3 Transfer line PRT J252 4 Transfer line GND S J252 5 Water bath PRT J252 6 Water bath GND S Released MAY 2000 G2350A AED Service Manual 225 Cabling Diagrams and Pinouts Main board part no G2350 60015 Connector P500 AC board Pin Function Pin Function 1 Line sense 10 High V primary 2 24 V enrage 11 Main relay 3 High V ON OFF 12 Reference GND 4 Water pump control 13 DC ground 5 Mignonette overheat 14 DC ground 6 H30 sense 15 Reference GND 7 AUX3 16 20 VAC 8 AUX2 17 20 VAC C T 9 AUX1 18 20 VAC Connector P101 service display board Pin Function Pin Function 1 BAO 11 BD6 2 BA1 12 GND D 3 BA2 13 GND D 4 BA4 14 GND D 5 BDO 15 5V 6 BD1 16 5V 7 BD2 17 FPST
7. imos spectromete LN pa 12 6 transformer 13 Lu cavity fan 14 8 Figure 139 G2350A internal cabling diagram Released MAY 2000 G2350A AED Service Manual 210 Table 24 AED Cables Cabling Diagrams and Pinouts Internal cabling diagram No Description part no 1 PDA to main PCB cable assembly 62350 60860 2 Heater sensor cable assembly 62350 61310 3 High voltage power supply 62350 80075 4 AC input cable assembly 62350 60500 5 AC main cable assembly 62350 60690 6 Transformer leads 7 Emission source sense cable assembly G2350 60510 8 Water drawer control cable assembly G2350 60750 9 Service display board cable 05921 60710 10 Gas flow system connector 11 Sparker assembly cable 05921 61000 12 8 mm Ignition wire 18 5 inch long 8120 5473 13 Main harness cable assembly G2350 60680 14 Wires water board to flow sensor and pump Released MAY 2000 G2350A AED Service Manual 211 Cabling Diagrams and Pinouts AC board part no G2350 60057 AC board part no G2350 60057 Figure 140 AC board Released MAY 2000 G2350A AED Service Manual 212 Cabling Diagrams and Pinouts AC board part no G2350 60057 Connector P1 to main board P500 Pin Function Pin Function 1 Line sense 10 High voltage primary 2 24 V DC from main board 11 Main relay heated zone 3 High V on off 12 REF GND main board 4 Water pump control 13 DC GND 5 Magnetron overheat 14 DC GND 6
8. Datli e eee dee cs 178 Water pump 178 Water drawer sensors switches and connections 174 Water board connections eene enne nennen nnns 174 Pressure SWILCIVM ei eei retro reae qe peto v ee V Ehe VAR ERE Enc Resta 174 Chapter 4 Troubleshooting General Procedures PUPS since MR 176 Plasma shut off circuits 177 PRT resistance vs temperature rennen enne 179 Testing for microwave leakage eese neret 180 Using the service display board eese 181 Electronics AED does not turn ON 182 Troubleshooting the AC board esses enne nente 183 Troubleshooting the main board eene 183 Troubleshooting the high voltage power supply 184 Voltage problems ead entre adr 185 General troubleshooting esses netten ent 186 Zone snot heating eee eut etie nel t e OLEO eR 187 Gas Flow System Adjusting gas flow rates seessesssessessseeeeeee enne entente EEE 188 TM 188 Reagent and spectrometer purge gases eee 190 Discharge tube breaks frequently sees 192 Finding gas leaks ee eee pe 192
9. esses eene nennen enne 210 AC board part no 2850 60057_ 212 AC input cable assembly part no G2350 60500 216 AC main cable assembly part no G2350 60690 217 Emission source sense cable assembly part no G2350 60510 218 Gas flow system connector ccccccecsscceesssecceeesaececessececsesececcessaeccsssaeeeneaes 219 Heater sensor cable assembly part no G2350 61310 220 High voltage power supply part no G2350 80075 223 Main board part no G2350 60015 essere 224 Main harness cable assembly part no G2350 60680 230 PDA to main PCB cable assembly part no 12350 60800 tette reete re eremo n a PER PEDE RES 233 Service display board cable part no 05921 60710 234 Sparker assembly cable part no 05921 61000 234 Sparker board part no 05921 60030 236 Water board part no G2350 60080 sse eterne 237 Water board part no G2350 60085 sse eterne 239 Water drawer control cable assembly part no G2350 60750 240 Water drawer control cable assembly part no G2350 60755 242 Wires water board to flow sensor a
10. For a general description of how to operate the AED see Basic operation of your AED on page 39 Setting Up and Maintaining the G2350A AED For a detailed listing of the G2350A AED performance specifications see Spec ifications on page 50 Preparing your work station 1915 ALS 6890 GC G2350A AED Figure 1 A typical GC AED installation A typical AED installation requires space power gases and physical support as listed below In addition the amount of heat generated by the typical com ponents is also listed If any of your components are different than those below make sure that enough room is allocated for proper AED installation A complete GC AED ChemStation system typically consists of e G2350A Atomic Emission Detector e 6890 Gas Chromatograph with split splitless inlet and GC AED interface e G1915A or G1916A ALS with a G1512 Controller or 7683 ALS e GC AED ChemStation a Pentium TM processor based computer running the GC AED ChemStation under Windows NT 4 0 HP DeskJet or LaserJet printer Note that the AED must be installed to the right of the GC Released MAY 2000 G2350A AED Service Manual 12 Installation Preparing your work station Table 1 Physical Dimensions and Power Requirements G2350A AED HxWxD 41 x 52 x 57 cm 16 x 21 x 23 inch Power 1100 VA max 120 Vac at 20 amps or 100 Vac at 20 amps or 220 Vac at 15 amps or 240 Vac at 15 amps Outlets One outlet on individual ci
11. Hydrogen Gas To reduce risk of explosion fire and injury ensure that the hydrogen gas flow is turned off at the source and in the AED before starting this procedure Effluent Gases To reduce risk of breathing ozone and other harmful gases pro duced by the plasma turn off all reagent gas flows and the column flow before starting this procedure Turn OFF the AED Remove the gas drawer See Accessing the gas drawer on page 109 Split the drawer Remove connecting lines Remove the wires from the connector a AF WN Remove the solenoid assembly mounting screws Released MAY 2000 G2350A AED Service Manual 115 Caution Warning Gas Flow System Maintenance Replacing related components 7 Replace the solenoid and reassemble the gas drawer See also Solenoid will not operate on page 196 and Finding gas leaks on page 192 Replacing related components Other gas drawer components are replaceable by the Agilent CE To replace the components listed below see Accessing the gas drawer on page 109 e Back pressure regulator e Cavity pressure gauge e Column adapter brazement e Fitting bushing e Forward pressure regulator e Helium pressure gauge e Mass flow assembly See also Gas Flow System on page 188 Adjusting gas flow rates on page 188 and Finding gas leaks on page 192 Unless otherwise noted these components should be hand tightened and then given an additional 1 4 turn Do not use brass f
12. ash Titer m 116 GAS OTA WET eere pestes 118 Insulated jacket assembly and heated core 121 Water Flow System tet qtiae tete teri eas 122 Keeping clean water in the system 122 Pressure SWwILCl ueste e pee ae Eee PE Yee 123 Water iaceret o etre tee ete gene dede 124 Water board P 130 Water Gra wer cited eire dice tele Sakae 133 Water filter 135 FIOW SENSOT cete reete eee reet eeu eo eode 138 Released MAY 2000 G2350A AED Service Manual 56 General Maintenance Intended use General Intended use The maintenance section of this documentation is intended for use primarily by the Agilent Customer Engineer While some of the procedures described can be performed as part of regular maintenance and upkeep other procedures are to be performed only by qualified personnel Please reference the Setting Up and Maintaining the G2350A AED manual for routine maintenance proce dures General maintenance procedures When performing any maintenance on the G2350A AED observe the following rules e Adding distilled water to the reservoir when the water level is low is the only procedure which can be performed while the AED is running Never perform any other maintenance procedure while the AED is running e Allow the cavity and heated zones to cool down before performing mainte nan
13. Part Number Description UM Oty 8500 5067 Performance sample box EA 1 8710 0510 Open end wrench 1 4 inch amp 5 16 inch EA 2 878 2360 Hex key 2 5 mm EA 1 8710 0803 Open end wrench 7 16 inch amp 9 16 inch EA 1 8710 0972 Open end wrench 7 16 inch and 3 8 inch EA 1 8710 1876 Sm cavity twisted wire brush EA 2 8710 1938 Large cavity brush EA 1 8710 2358 Nut driver 5 5 mm EA 1 8710 2359 Wrench 1 2 and 3 8 inch EA 1 G2350 80610 Column setting tool plastic tube EA 1 G2350 80350 Hardware information CD ROM EA 1 G2350 61090 Discharge tube kit EA 3 G2350 61300 Heated transfer line EA 1 62350 90200 Contents list EA 1 G2350A Atomic Emission Detector II EA 1 62350 90110 Setting Up and Maintaining manual EA 1 Declaration of conformity EA 1 Also included with the AED is a Customer Information Sheet listing the step up conditions which optimized performance during testing at Agilent Technologies This data will be used to set up and test your unit Connecting control cables The G2350A AED comes with two control cables e GPIB cable e Remote start cable Released MAY 2000 G2350A AED Service Manual 28 Installation Connecting control cahles Sampler control 7673 only Tower Remote start Tray cable cable GPIB cable Parallel cable GPIB cable Remote start cable 6890 GC Figure 11 GC AED ChemStation cabling diagram Warning High Voltage To reduce risk of electric shock disconnect the powe
14. Service Manual Agilent G2350A Atomic Emission Detector Released MAY 2000 G2350A AED Service Manual Copyright Agilent Technologies 2000 All Rights Reserved Reproduction adaptation or translation without permission is prohibited except as allowed under the copyright laws Part No G2350 90157 First edition MAY 2000 Replaces Part No G2350 80170 and G2350 90150 Printed in USA Microsoft is a U S registered trademark and Windows is a trademark of Microsoft Corporation Safety Regulatory Information The G2350A Atomic Emission Detector AED meets the following IEC International Electrotechnical Commission classifications Safety Class 1 Transient Overvoltage Category II and Pollution Degree 2 This unit has been designed and tested in accordance with recognized safety standards and designed for use indoors If the instrument is used in a manner not specified by the manufacturer the protection provided by the instrument may be impaired Whenever the safety protection of the G2350A AED has been compromised disconnect the unit from all power sources and secure the unit against unintended operation Refer servicing to qualified service personnel Substituting parts or performing any unauthorized modification to the instrument may result in a safety hazard Disconnect the AC power cord before removing the top cover The customer should not attempt to replace the fuses i
15. Table 4 Electrical Supply Summary Circuits Outlets GC 1 dedicated 1 AED 1 dedicated 1 Sampler Computer monitor Shared 2 Printer Shared 1 Getter Shared 1 Gas sources The AED requires the pure gases listed below Table 5 Pure Gases Gas Function Purity Helium GC carrier gas and AED plasma 99 9999 Hydrogen AED reagent gas 99 997 Oxygen AED reagent gas 99 997 Nitrogen Spectrometer purge 99 99 Auxiliary Gas 10 1 CH4 90 AED reagent gas 99 99 Methane AED reagent gas 99 99 The purity requirement is on original gases for the reagent gas The G2350A AED can only be plumbed for three reagent gases The user must decide whether to plumb for 10 CH 90 N to detect oxygen 171 or for methane to detect nitrogen 388 mm line and nitrogen 15 isotope The performance verification checkout procedure described in this manual requires 10 CH4 90 N Released MAY 2000 G2350A AED Service Manual 16 Installation Suppliers of helium getters and nitrogen generators Agilent Technologies requires six 9 s 99 999996 gas for helium An optional method of obtaining that level of purity is with the use of five 9 s gas and a helium getter A helium getter is recommended to help ensure helium gas purity Do not use filters on the helium line For nitrogen spectrometer purge the user is advised to provide a moisture trap part no 5060 9084 and a hydrocarbon trap part no 5060 9096 to pre ve
16. e Set the response switch to FAST e Zero the meter with the knob labeled ZERO ADJ 3 Turn the AED Activate the magnetron power supply by issuing the IGN command 5 With the 5 cm spacer installed on the probe slowly pass it as close as pos sible to all areas around the emission source Pay special attention to the joints between the cavity and the waveguide 6 Record the results of the test A reading of gt 5 mW cm is outside the spec ification and must be corrected A sizable leak is indicated by the meter beeping during testing Immediately shut off the AED and inspect the hardware for possible assembly failures Released MAY 2000 G2350A AED Service Manual 180 General Procedures Troubleshooting Using the service display board Using the service display board To use the service display board if available for troubleshooting plug the rib bon cable into the P101 connector on the main board The service display board displays the same AED diagnostic messages and codes sent to the com puter Remove the board when finished Figure 131 P101 connector location Released MAY 2000 G2350A AED Service Manual 181 Electronics Electronics Troubleshooting AED does not turn ON AED does not turn ON Problem Possible cause Suggested actions AED does not turn on nothing happens AC board not providing power to main board or high voltage power supply Main board not powering
17. Be careful not to disturb the nut and ferrule in the end of the heated core Released MAY 2000 G2350A AED Service Manual 92 Emission Source Maintenance Moving the cavity assembly to the service position Figure 59 Gas union disassembly 12 Loosen the lens mount nut and slide it away from the cavity 13 Slide the spectrometer and lens mount assemblies to the right until clear of the cavity Be careful not to damage the nitrogen purge line or crimp the spectrometer cable See Figure 60 below You will need to lift the right edge of the spectrometer over the lip on the sheet metal Figure 60 Emission source disassembled from spectrometer assembly 14 Remove the thumbscrew in the disconnect block Lift the top of the block off so that the metal tubing from the gas union is free Gently move the block around the lens purge tubing so it won t entangled when you pull the drawer out See Figure 60 15 Loosen the two thumb nuts on the emission source lock Lift the lock Released MAY 2000 G2350A AED Service Manual 93 Emission Source Maintenance Replacing other emission source assembly hardware Figure 61 Thumbnuts on the emission source lock 16 Slide the water drawer cavity and emission source assemblies out from the AED until there is enough space to perform the maintenance Replacing other emission source assembly hardware To remove the following parts assemblies for replacement see the instructions
18. Cabling Diagrams and Pinouts Water drawer control cable assembly part no G2350 60750 Connector P2 Pin Function 1 2 3 4 5 6 15 V fan GND NC NC GND 15 V fan P2 on the water board connects to the fan Connector P3 Pin Function 1 NC 2 NC 3 PRT 4 PRT shutdown P3 on the water board connects to the water drawer control cable G2350 60 755 Water drawer control cable assembly part no G2350 60750 Pin 1 Pin 1 Figure 154 Water drawer control cable assembly Released MAY 2000 G2350A AED Service Manual 240 Cabling Diagrams and Pinouts Water drawer control cable assembly part no G2350 60750 Connector to heater sensor cable pinouts Pin Function 1 NC 2 NC 3 GND for cabling ckt closed sensor 4 24 V 7 24 V enable 10 Shorted to 13 11 PRT ckt to pressure switch and flow sensor 13 J252 5 from main board PRT ckt Shorted to 10 110 ohms 14 J252 6 from main board PRT ckt Connector to pressure switch Should read 110 ohms nominal or open when system is down Connector to water board J1 Pin Function 1 Enable 24 V when pump and fan are running 2 GND 3 GND 4 24V Released MAY 2000 G2350A AED Service Manual 241 Cabling Diagrams and Pinouts Water drawer control cable assembly part no G2350 60755 Water drawer control cable assembly part no G2350 60755 Pin 1 62350 60750 XX XX XX XX
19. Column flow Makeup Gases Spectrometer window purge Gases gt All Gases Detail of cavity flows Figure 135 Gas flow systems in basic operation flow mode Released MAY 2000 G2350A AED Service Manual 191 Gas Flow System Troubleshooting Discharge tube breaks frequently Discharge tube breaks frequently Problem Possible cause Suggested actions Discharge tube breaks fre quently and with shorter than expected mean time to failure Low water flow Pieces of a broken discharge tube are lodged between the discharge tube and water jacket Coating on outside of dis charge tube restricts water flow Connections are too tight causing stress on the dis charge tube GC side water chamber GC side brazement and or opti cal side water chamber not aligned properly Finding gas leaks Use a graduated cylinder to verify that the water flow is 400 mL min See Verifying the actual water flow rate on page 203 Measure the pump voltage the voltage across P1 1 and P1 3 on the water board Normal voltage ranges between 9 12 V A voltage of 20 V indicates a restriction or pump problem Clean the cavity and blow out the cav ity and water lines with high pressure air If the problem persists troubleshoot the water drawer to verify that the pump flow sensor and board are operating correctly Clean replace discharge tube Use only distilled water Check the water to make sure it is distilled and
20. Remove the column and disconnect the transfer line heated core and insulated jacket assembly from the gas union as described in Moving the cavity assembly to the service position on page 91 Figure 88 Loosening the transfer line 3 Loosen the nut that secures the column to the GC oven and slide the col umn out of the heated core 4 Slide the heated core out of the insulated jacket assembly Replace the heated core if required 5 Slide the insulated jacket out of the GC Replace the insulated jacket if required Released MAY 2000 G2350A AED Service Manual 121 Water Flow System Maintenance Replaceable Components Water Flow System While working on the water drawer it is usually most convenient to couple the cavity assembly to the AED enclosure so the drawer can be removed sepa rately Replaceable Components 5 pm water filter element Hose clamps Modified water board assembly Pressure switch AED serial number lt US01000166 Pump Tubing Water drawer control cable assembly Flow Sensor AED serial number US01000166 Tools needed Posi drive Small flat head screwdriver to adjust the water flow sensor AED serial number lt US01000166 Keeping clean water in the system Fill the reservoir to within 1 inch of the top with distilled water Distilled water will keep the system clean Do not add algal inhibitors Do not use de ionized water De ionized water damages the tubing and fittings and re
21. See GPIB address on page 79 below 7 Install a new board Make sure that the heat sinks shown in Figure 49 do not short to any cover See also Main board on page 150 and Troubleshooting the main board on page 183 Released MAY 2000 G2350A AED Service Manual 78 Warning Caution Electronics Maintenance Main board GPIB address The GPIB controller can be set to a different address as described below High Voltage To reduce risk of electric shock disconnect the power cord from the AED The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics 1 Turn OFF the AED 2 Openthe top cover 3 If desired remove the main board See Replacing the main board on page 77 4 Set or reset the pins on the GPIB controller to match the proper GPIB con figuration For installed systems reference the ChemStation Configuration Editor for each instrument s current GPIB address Pins 2 3 4 in down position Figure 50 GPIB default setting 15 Released MAY 2000 G2350A AED Service Manual 79 Electronics Maintenance Main board An address of 15 is set as follows Table 15 Default Settings Switch Setting 1 up 2 down 3 down 4 down 5 to 8 up ROM Three ROMs on the main board are replaceable
22. board If there is power check the pinouts on the AC board to ver ify power is going to the heated zones If there is no power the relay is bad Replace the AC board See Figure 132 AC board See Troubleshooting the main board on page 183 Check the fuse and replace if necessary Check the transfer line magnetron and cavity heaters to verify they are not damaged before restarting the AED If the fuse is intact replace the AC board See Figure 139 G2350A internal cabling diagram Released MAY 2000 G2350A AED Service Manual 187 Gas Flow System Troubleshooting Adjusting gas flow rates Gas Flow System Adjusting gas flow rates Follow the steps below to adjust the gas flow rates When practical set the flow rates to the values given on the factory Customer Information Sheet pro vided with the AED Otherwise adjust the flow rates as described in First start up on page 41 Refer to Figure 135 for a gas flow system schematic During this procedure no column should be installed Cavity pressure Fly ash filter Make up gas Helium supply pressure Figure 134 Gas drawer Helium 1 Check the supply gas conditions Expected Source gas condition Helium source pressure 60 psi Oxygen 30 psi Hydrogen 15 psi Nitrogen methane 25 35 psi Released MAY 2000 G2350A AED Service Manual 188 2 Gas Flow System Troubleshooting Adjusting gas flow rates Turn off all reagents and the s
23. 20 2 22 23 Using the small nylon screw provided in your ship kit gently push the dis charge tube and O ring inward until the O ring seats in its recess and is flush with the discharge tube end Using lab tissue to cover the sharp edge of the exit chamber install the exit chamber and hand tighten Use two wrenches to tighten the gas union 1 8th of a turn Use the 5 16 inch wrench to maintain orientation as shown in Figure 70 Look through the cavity window to make sure the tube is still intact If you removed the cavity water lines while cleaning the cavity you may wish to perform a gross leak test now See checking the Cavity gross leak test on page 104 This is a recommended good practice Slide the water drawer back into the AED Reattach the spectrometer assembly to the cavity Make sure the lens mount nut is tight Warning Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED Released MAY 2000 G2350A AED Service Manual 102 24 Emission Source Maintenance Discharge tube Re start the AED Caution If there is a water leak quickly shut off the AED to avoid spilling water within the enclosure 25 26 27
24. 81 Electronics Maintenance Sparker board Figure 52 Remove the mounting screw to sparker assembly 5 Lift the sparker assembly out of the two slots in the enclosure and remove 6 Replace and reassemble in reverse order Figure 53 Sparker board See also Sparker board on page 152 and Sparker board part no 05921 60030 on page 236 Released MAY 2000 G2350A AED Service Manual 82 Warning Warning Electronics Maintenance Sparker board Sparker PCB assembly Replace the sparker board as described below High Voltage To reduce risk of electric shock disconnect the power cord from the AED High Voltage To reduce risk of electric shock the ground strap for the magne tron power supply must always be connected to the waveguide when the AED is in operation Turn off the AED and unplug the power cord Open the top cover Remove the connectors at J1 and J2 Remove the four M4 mounting screws using a posi drive nO cg m or Install a new board Ignition module Replace the ignition module as described below High Voltage To reduce risk of electric shock disconnect the power cord from the AED High Voltage To reduce risk of electric shock the ground strap for the magne tron power supply must always be connected to the waveguide when the AED is in operation Turn off the AED and unplug the power cord Open the top cover Remove the four blade connectors Remove the two M4 mounting screws usi
25. AED Service Manual 205 Error messages Error messages Error messages A D and DRAM messages The ChemStation displays the following messages when a problem is detected in the A D converter or PDA board A D RAM FAILED Meaning Fatal error in the main board RAM Possible cause Faulty main board Replace the board and re test BAD DRAM BUFFER Meaning Fatal error in the main board DRAM buffer Possible cause Faulty main board Replace the board and re test A D CPU FAILED Meaning Fatal error in the main board A D converter CPU Possible cause Faulty main board Replace the board and re test If the prob lem persists replace the PDA and retest A D SW MISMATCH Meaning Fatal error Possible cause Faulty main board Replace the board and re test A D FAULT Meaning Fatal error in the main board A D converter in the PDA control subsystem Possible cause Faulty main board Replace the board and re test BAD CAVITY READING BAD XFR LN RDG Meaning The signal from the cavity PRT or heater transfer line PRT is below 100C or above 460C Possible cause Faulty PRT Faulty heater Faulty AC board Faulty main board Released MAY 2000 G2350A AED Service Manual 206 Error messages Error messages CAVITY OVERHEAT XFER LN OVERHEAT Meaning The signal from the cavity PRT or heater transfer line PRT is above 460 C or has significantly exceeded the setpoint Possible cause Faulty PRT Faulty heater
26. As long as conditions in the cavity are acceptable the plasma is ignited or triggered as the spark travels through the microwave energy Ignition coil The ignition coil increases the initial ignition pulse from 13 6 V up to 20 kV Water board Figure 114 62350 60080 62350 60085 Water boards G2350 60080 The water board regulates the discharge tube temperature while the AED is on and controls the AED cooling fan It monitors a water flow sensor and contains a pressure switch to confirm coolant flow The water board also compares the flow sensor information to set points to determine the appropriate coolant flow rate The board then varies the water pump speed accordingly The pres sure switch and a relay attached to the flow sensor are connected in series to connector J252 on the main board If the either switch or the relay opens the main board stops the 24 V power to the water board and the power to the mag netron to prevent plasma ignition The main board notifies the user of the potential problem The relay opens when the output from the flow sensors is less than 2 5 V During start up the main board allows for a delay of approxi mately 30 seconds for the water pump to pressurize the system Released MAY 2000 G2350A AED Service Manual 153 Electronics Theory of Operation Power supply The water drawer cooling fan runs at a constant rate while the AED is ON A diagnostic LED on the water board flashes when th
27. Cap off the lens purge inlet 4 Remove the lens mount cone lens mount liner and lens mount liner O ring Be careful not to lose the O rings in the lens mount liner 5 Inspect the lens mount liner for deterioration If the central area of the lens mount liner is greatly discolored or if the lens mount cone is loose and cannot be tightened replace the lens mount liner Dirt or scratches on the lens decrease AED performance Avoid scratching the lens Never touch the lens with bare fingers Always wear clean latex or simi lar gloves to handle the lens 6 Unscrew the three mounting screws in the lens keeper and carefully remove it and the lens 7 Replace or clean the lens as needed Figure 42 Lens keeper removed 8 Reassemble the lens and lens keeper in reverse order Be sure the O ring is secure and undamaged Tighten the screws a little at a time until all are tight following a circular tightening pattern 9 Place the lens mount nut over the lens mount bottom threads facing out Install the lens mount liner with the through holes at the 12 o clock 1 o clock and 4 o clock position See Figure 43 Released MAY 2000 G2350A AED Service Manual 68 Optical Assembly Maintenance Lens mount assembly Figure 43 Lens mount liner orientation 10 Reassemble the rest of the parts in reverse order Cleaning the lens 1 Remove the lens as described above in Removing the lens on page 68 2 Wipe the lens with
28. D RO EUER 194 No pressure at the cavity pressure gauge esee 195 Plasma glows Drown tree 195 Plasma glows red munire o dte e 196 Solenoid will not operate sess eene nnns 196 Troubleshooting the gas drawer eese 199 Spectrometer and Chromatography Chromatographic peaks not sharp 200 Loss of UV SCTISIUIVICY sirar co e ere ipie tee tee ote ce ees 200 PDA output not registering eese enne 201 Released MAY 2000 G2350A AED Service Manual Contents Sensitivity 1S DOOF eet eU rti tdi ee eene 201 UV wavelengths missing ertt entretenir e E a eaii a 201 Verifying PDA performance 1 1 esses eene eene nennen nnne 201 Water Flow System Flow rate too low high 0 es eeceeccesceescecseceseceseeenceseeeeacecseecseceseceeeeeaeeeaeeaees 202 Pump cycles very fast then slow 203 Verifying the actual water flow rate esee 203 Water board LED diagnostics G2350 60080 only 203 Water leaks en t pec eet ee ern ee eo Cae e RA OE ye eve 204 Chapter 5 Error messages Errormessages ue edite e eae e rn Reate en 206 A D and DRAM messages ssssesseeseeeeeeeee ener nest nete tenent 206 Chapter 6 Cabling Diagrams and Pinouts Internal cabling diagram
29. Exhaust High Flow Solenoid 55 off E Helium column flow fpr forward pressure regulator mfc manual flow controler bpr back pressure regulator m1 main manifold block m2 secondary manifold block gage 1 helium head pressure gage gage 2 cavity pressure gage r1 to r17 pneumatic restrictors ferrule cavity vent vent Gas flow system Window purge Makeup gases gt Makeup Gases Column flow Makeup Gases Spectrometer window purge Gases All Gases Cavity flow detail solvent vent ON Figure 120 Gas flow system in solvent vent mode Released MAY 2000 G2350A AED Service Manual 162 Gas Flow System Theory of Operation Flow modes Calibration mode and lines Description Helium lens purge gas is routed through the spectrometer side of the cavity to back flow through the discharge tube N and O leech through the bypass tube reach the plasma and register at the PDA for calibration e Solenoid s energized Solvent vent e Total flow rate 25 mL min 02 Solenoid 51 off H2 Solenoid 52 off CH4 N2 Solenoid S3 off Solvent Vent Solenoid 54 ON High Flow Solenoid 55 off 02 or 02 Helium H2 or H2 Helium He CH4 N2 or CH4 N2 helium Static or Exhaust Helium column flow fpr forward pressure regulator mfc manual flow controler bpr back pressure regulator m1 main manifold block m2 secondary manifold block gage 1 helium head pre
30. Faulty AC board Faulty main board CAVITY NOT HEATING XFER NOT HEATING Meaning The signal from the cavity or heated transfer line PRT indi cates that the heated zone has not begun to increase in temper ature within 3 minutes after its heater was turned on Possible cause Faulty PRT Faulty heater Faulty AC board Faulty main board CAVITY TEMP XFER LINE TEMP Meaning Zone temperature errors are shown whenever the cavity assembly PRT or the heated transfer line PRT reads a tempera ture outside of the acceptable setpoint range For example the messages are displayed at start up until the zones heat to set point temperature HIGH VOLTAGE OFF Meaning The main board has not yet sent the high voltage enable signal to the power supply to ignite the plasma This message is dis played while the AED is warming up and while the heated zones are not yet up to temperature Possible cause See No plasma on page 194 NO CAVITY SENSOR NO TRANSFER LINE Meaning The main board does not detect the presence of the cavity PRT or the heated transfer line PRT Possible cause Part not installed PRT faulty Loose connection Open safety switch Released MAY 2000 G2350A AED Service Manual 207 Error messages Error messages SPECTR NO WATER Meaning The SPECTR NO WATER error message is displayed when ever the pump is disabled for any reason On the main board pin 1 of connector P500 will read 0 V to ground instead of the
31. G2350A AED Service Manual 183 Electronics Troubleshooting Troubleshooting the high voltage power supply 2 For potential communications GPIB problems verify the GPIB address is set correctly on the board If the problem persists troubleshoot the GP IB by switching the main board Once a problem has been isolated to the main board replace the board and re test Figure 133 Main board See also Figure 139 G2350A internal cabling diagram Troubleshooting the high voltage power supply Warning High Voltage To reduce risk of electric shock disconnect the power cord from the AED Warning High Voltage To reduce risk of electric shock the ground strap for the magne tron power supply must always be connected to the waveguide when the AED is in operation Released MAY 2000 G2350A AED Service Manual 184 Voltage problems Electronics Troubleshooting Troubleshooting the high voltage power supply Problem Possible cause Suggested actions No low voltage no filament current No high voltage to magne tron no plasma Bad cabling connections or main board No power from AC board Main board contactor K2 not working High voltage power supply Bad cabling connections or main board A zone temperature or the water flow rate reading is not correct No signal from main board Check the gauges The amp meter gauge should read 8 A If it does check the cabling and the main board If it does
32. Remove the PDA Do Pam 5977 Figure 36 PDA removed 11 Ensure the O ring is properly seated then install the new PDA using the two mounting screws 12 Re assemble in reverse order See also PDA on page 145 Spectrometer Replace the spectrometer as described below when problems with the optics are suspected and all other causes have been ruled out Warning High Voltage To reduce risk of electric shock disconnect the power cord from the AED 1 Turn off the AED 2 Slide out the cavity assembly and water drawer as described in Moving the cavity assembly to the service position on page 91 Released MAY 2000 G2350A AED Service Manual 63 Optical Assembly Maintenance Spectrometer Can ttor Trot shown Figure 37 Spectrometer detached from cavity assembly Disconnect the PDA ribbon cable from the PDA Disconnect the spark plug wire and unscrew the spark plug and remove Disconnect the lens purge and cavity vent lines Unplug the connector at the rear of the spectrometer Turn OFF the nitrogen purge at the source 0 o Disconnect the spectrometer purge line using a 9 16 inch and a 7 16 inch wrench Plug the line and the spectrometer inlet 9 Take the spectrometer and cradle out of the AED and place them on a bench 10 Place the spectrometer so that it stands with the slit and PDA on top Figure 38 Spectrometer on end 11 Remove the two screws in the PDA and remove the PDA Clean the t
33. emission regions The element characteristic wavelengths detectable using the G2350A AED are given in Table 18 below Released MAY 2000 G2350A AED Service Manual 142 Table 18 Table of Spectral Lines Overview Theory of Operation B F N S 249 773 685 602 174 272 180 734 182 587 690 246 746 831 182 036 same as S 744 230 182 626 Brill H 0 SI 481 670 656 285 170 CO band 545 388 470 485 486 133 777 539 478 550 434 047 777 194 410 174 777 417 C He P Se 193 090 471 338 253 561 203 985 247 856 706 519 255 325 196 090 495 724 2nd 253 561 253 399 Si Cd Hg 255 490 251 611 228 802 253 652 178 287 326 105 184 950 178 768 Sn 255 490 283 999 CI l 213 547 286 332 479 454 206 238 213 618 303 481 006 206 163 214 914 271 481 946 180 186 542 325 725 665 1 d Pb 837 597 466 648 217 558 516 120 283 307 533 822 405 782 562 569 Line used in the G2350A AED Released MAY 2000 G2350A AED Service Manual 143 Optical Assembly Theory of Operation Spectrometer Optical Assembly The optical assembly consists of a spectrometer including a grating mirror and grating motor PDA and preamplifier assembly These components break down the emitted energy and sort it for analysis by the ChemStation The opti cal assembly components are briefly described below Spectrometer The spectrometer focuses emitted light and directs it onto the PDA for detec tion The light emitted by the excited atoms p
34. ferrules e Avoid sharing the AED s gas system with other instruments The gas sys tem should be dedicated to the AED Fewer connections unions and tees and shorter supply tubing provides better performance e Usea gas getter to ensure the purity of the helium gas Gas system set up 1 Install a moisture trap part no 5060 9084 and a hydrocarbon trap part no 5060 9096 on the nitrogen gas line that will feed the spectrometer purge 2 Set up the gas cylinders sources for the purities and pressures listed below Released MAY 2000 G2350A AED Service Manual 19 Installation Installing your ChemStation software Table 8 Gas Cylinders Sources Setup Flow Rate mL min Gas Purity Approx Consumption Supply Pressure psi Helium 99 9999 200 80 100 Hydrogen 99 997 20 60 Oxygen 99 997 20 60 Auxiliary Gas 10 99 99 20 60 1 CH4 90 Methane 99 99 20 70 90 Nitrogen 99 99 400 40 The purity requirement is on original gases for the reagent gas Installing your ChemStation software The G2350A AED requires ChemStation GC AED software for operation If you already have a computer set up to run the proper version of the ChemStation software and know how to use it move on to Uncrating Your AED If the GC AED ChemStation software must be installed or if you are not familiar with it take time now to install it and learn to use it It is important that you under stand how to use this software t
35. guide channel 9 Labelthe lines from the gas union and label the connecting lines inside the gas drawer 10 Use two 5 16 inch open end wrenches to disconnect the Swagelok fittings from the disconnect block tubing Use a 7 16 inch open end wrench to remove the tubing from the T union in the back of the drawer 11 Unplug the cable connector at the back of the drawer 12 Remove the gas drawer from the AED 13 Install a new drawer in reverse order See also Finding gas leaks on page 192 Gas Flow System on page 188 Sole noid will not operate on page 196 and Gas Flow System on page 157 Released MAY 2000 G2350A AED Service Manual 120 Warning Gas Flow System Maintenance Insulated jacket assembly and heated core Insulated jacket assembly and heated core To replace the Insulated Jacket Assembly and or Heated Core transfer line heater and PRT assembly High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves High Voltage To reduce risk of electric shock disconnect the power cord from the AED Effluent Gases To reduce risk of breathing ozone and other harmful gases pro duced by the plasma vent G2350A AED effluents from the side panel to a fume hood 1 Turn OFF the heated zones including the GC oven and allow them to cool to ambient temperature Turn OFF the AED 2
36. heated zones Heated transfer line temperature See 1 below See 1 below High voltage heated zones Emission source temperature See 1 below See 1 below High voltage heated zones Switch on the spectrometer grating motor Closed Closed 0 V High voltage heated zones Emission source safety switch 2 Emission source in enclosure when Closed 0 V High voltage heated zones water drawer open Pressure switch in water drawer 2 Water flow gt 250 mL min Closed High voltage heated zones water board Relay switch on water board 3 gt 250 mL min flow Closed High voltage heated zones water board 1 The main board will assume there is a temperature runaway problem and turn off the plasma if any PRT reads above 460 C or if a PRT significantly exceeds the temperature set point 2 The water drawer circuit is a safety circuit controlled by the main board as if it were a PRT A resistor in the water drawer control cable provides a 110 W impedance in the circuit which the main board interprets as ambient temperature If a switch opens the main board sees an infinite resistance and the plasma is shut off prevented as if there were a temperature runaway problem 3 Only used in AEDs with serial number lt 1000166 See F ow sensor on page 138 for a photograph For example high voltage to the plasma will be shut off if any of the following occur The resistor in the water drawer control cable fails or the resistance drifts out of rang
37. heated zones are turned off and power to the emission source is stopped Relay switch AED serial number US 01000166 When the water flow through the system is 400 mL min 30 mL min the relay switch is closed If the water flow drops below 250 mL minute or the 2 5 volt equivalent the relay switch on the back of the water board opens and the heated zones are turned off The emission source is powered down Diagnostic LED AED serial number US 01000166 The diagnostic LED on the water board flashes when the flow rate is 370 mL min or less Released MAY 2000 G2350A AED Service Manual 174 Troubleshooting General PFOCeQUEGS oer proto LE se Pi EPA ta SENE E 176 E 176 Plasma shut off circuits 177 PRT resistance VS temperature sees 179 Testing for microwave leakage eene 180 Using the service display board esses 181 Icone 182 AED does not turn ON eese eene 182 Troubleshooting the AC board eese 183 Troubleshooting the main board esses 183 Troubleshooting the high voltage power supply 184 ZONE snot heating ois sec e 187 Gas FIOW System i ovr rre eoe e eM EE FIRE NAE eR RT 188 Adjusting gas flow rates essent 188 Discharge tube breaks frequently 192 Finding gas leaks nee ene te
38. in the drawer so that the lock will fully engage the drawer e The emission source support clip located near the door open switch and the drawer See also Emission Source on page 156 Released MAY 2000 G2350A AED Service Manual 107 Gas Flow System Maintenance Replaceable components Gas Flow System Replaceable components Ash filter assembly Back pressure regulator Cavity pressure gauge Filter tube fly ash Fitting bushing Forward pressure regulator Gas drawer Helium pressure gauge Mass flow assembly Solenoid assembly Column adapter brazement Heated core assembly Heated transfer line Insulation jacket assembly Tools needed Two 5 16 inch open end wrenches Two 7 16 inch open end wrenches 9 16 inch open end wrench Posi drive Gas flow meter Released MAY 2000 G2350A AED Service Manual 108 Warning Warning Gas Flow System Maintenance Accessing the gas drawer Accessing the gas drawer Cavity pressure Fly ash filter Helium supply pressure Figure 75 Gas drawer version with exterior fly ash filter shown There are two versions of the gas drawer in service For AEDs with serial num ber 03000208 the fly ash filter is mounted on the inside wall of the drawer front panel All newer AEDs have an externally mounted fly ash filter as shown in Figure 75 To access the Gas Drawer for maintenance or troubleshooting Hydrogen Gas To reduce risk of explosion fire and injur
39. methods eese ON OEE Switch bete VIEW ues cette eet e eet he eua epe eu voee do Eden Adjusturig gas flOWS deeem ete eben Adjusting the water flow esses nennen nennen enne Checking the water level esses eene tenentes Order of GC AED system start up Important operating tips seen eene G2350A Atomic Emission Detector Service Information Copyright 2000 Agilent Technologies Part number G2350 90157 First Edition MAY 2000 Replaces part number G2350 80170 and G2350 90150 Contents First start ette e nne Pe Mae 41 Install the column in the GC eese enne 41 Turn the AED ON and set the initial gas flow rates 41 Adjust EPC controlled reagent gas flow rates 6890 only 44 Adjust manually controlled reagent gas flow rates 45 Verify initial spectrometer purge eeseseeeeeeeeneeee enne 46 Verifying performance 4T E 47 Specifications SE 49 Specifications bnt mto o He Ue ULP Ee gre 50 Sample chromatograms and tabulated data 51 Checkout sample composition 55 Chapter 2 Maintenance General l air cicada enn
40. needed Gas union Normally the gas union is replaced as a whole unit and is not disassembled However if for any reason it is disassembled it is important that the four bellville washers are installed correctly While holding the GC half of the gas union facing up install two washers so that their conical surface faces up Install the last two washers with their conical surfaces facing down Re assemble the gas union halves Tools needed Posi drive Flat head screwdriver 5 mm nut driver 7 mm nut driver 1 2 inch open end wrench Two 5 16 inch open end wrenches 7 16 inch open end wrench Small nylon screw or equivalent Agilent supplied nylon screw or equivalent Correction fluid Column trimming tool part no 62350 80610 Needle nosed pliers Cavity brushes part no 8710 1876 and 8710 1938 2 5 mm hex key Special handling notes and cautions Check the unit for microwave leakage whenever any portion of the magnetron waveguide or cavity to waveguide interface has been loosened or disassem bled and reassembled See Testing for microwave leakage on page 180 Cleaning the cavity After removing a broken discharge tube you will need to clean the cavity assembly to prevent small particles of glass from lodging in the water flow paths Such debris will shorten discharge tube life and can damage other parts of the flow system Clean the cavity as described below Released MAY 2000 G2350A AED Service Manual 87 Warnin
41. not de ionized De ionized water corrodes the tubing which causes deposits to form on the discharge tube Check that the gas union and exit chamber seals have not been over tightened Disassemble and reassemble Check for water leaks which may indicate misalignment Check the O rings for damage and proper seating If the GC side water cham ber GC side brazement and or optical side water cham ber show signs of damage replace them Gas leaks often show up as pronounced nitrogen lines in the background as air gets into the GC or AED system See also Figure 135 for a diagram of the gas flows in the AED First determine where to look for the leak 1 Let the column cool to a temperature of less than 50 C 2 Turn off the column flow by removing the septum Watch the nitrogen 174 line If the nitrogen peak diminishes the leak is in the GC If there is no change the leak is either not in the GC or is common to both systems Released MAY 2000 G2350A AED Service Manual 192 Gas Flow System Troubleshooting Finding gas leaks Alternately 1 Disconnect the GC from the AED plug the open end of the gas union and check the N 174 C 193 H 486 and O 170 lines as appropriate If the lines still read excessively high see below the leak is in the AED Vary the carrier gas flow rate into the plasma and monitor the N 174 C 193 H 486 or O 170 lines If the area counts increase with increasing carrier flow the leak is
42. power supply up and out of the AED Install a new power supply Make sure that the tab in the power supply aligns with the slot in the enclosure bottom 10 Reconnect the power supply to the emission source Re attach the ground strap Released MAY 2000 G2350A AED Service Manual 75 Warning Caution Warning Electronics Maintenance Service display board High Voltage To reduce risk of electric shock the ground strap for the magne tron power supply must always be connected to the wave guide when the AED is in operation 1l Reinstall the fire wall Make sure that the cables will feed through the fire wall without excessive stress See also Troubleshooting the high voltage power supply on page 184 and Power supply on page 151 Service display board The service display board is an optional diagnostic tool available only to the Agilent Customer Engineer To install the board The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics High Voltage To reduce risk of electric shock disconnect the power cord from the AED m Open the AED top cover B Attach the ribbon cable from the service display board to the P101 connec tor on the main board See Figure 48 Figure 48 Installing the service display b
43. preventing the makeup and column flows from entering Instead they are routed to bypass through the solvent vent solenoid and out to vent Released MAY 2000 G2350A AED Service Manual 173 Water Flow System Theory of Operation Water drawer sensors switches and connections Water drawer sensors switches and connections Water board connections Connector J1 is the power input from the AC board and carries a 24 V enable signal in pin 4 while the pump is operating Output from the flow sensor if equipped enters the water board at J2 The P1 connector carries 9 to 21 V DC to the pump The P2 connector powers the fan with 15 V DC The connector is part of a series loop to turn off water board emission source and heated zone power if there is a problem The pressure switch is in the water control drawer assembly cable which connects to the water board at P3 and is in series with the flow sensor relay if equipped the cavity PRT temperature circuit and the main board If water pressure is too low the main board stops power to the water emission and heating systems For information on water board pinouts see Water board part no G2350 60080 on page 237 or Water board part no G2350 60085 page 239 Pressure switch When the water flow through the system is above 250 mL min the water pres sure is sufficient and the pressure switch remains closed If the water pressure drops too low the pressure switch opens the
44. reconnect the ground strap to the high voltage power source Lethal voltage could be present on the case if it is not reconnected 13 Re assemble in reverse order Check the unit for microwave leakage whenever any portion of the magnetron waveguide or cavity to waveguide interface has been loosened or disassem bled and reassembled e Install the new emission source assembly into the AED with the lock UP After the emission source is seated push the lock DOWN to secure it to the AED Slide the water drawer in and check for clear ance between the drawer cabling and emission source assembly Released MAY 2000 G2350A AED Service Manual 106 Emission Source Maintenance Emission source assembly e Align the tab on the emission source lock with the slot in the enclo sure Drop the lock into the slot and secure the thumbscrews e Ensure that the emission source assembly engages the interconnect Switch e Make sure the power supply cable is out of the way of the water drawer e Check the clearance between the drawer and cabling Make sure the emission source lock functions properly e Reconnect the water tubes as follows Fittings Tube No Flow direction Left side fitting 1 Flow out from cavity Right side fitting 2 Flow in to cavity 14 Check for interference between the hardware at e The lock and the water drawer track e The white washer on the lock and the drawer The washer should fit inside the square notch
45. risk of explosion fire and injury ensure that hydro gen gas is only connected to the gas inlet on the side panel labeled HYDROGEN Hydrogen Gas To reduce risk of explosion fire and injury ensure that the hydrogen gas flow is turned off at the source and in the AED before starting this procedure 1 Turn off the AED 2 Turn off the column flow Set the GC oven temperature to less than 40 C Turn off all gas flows at the AED and the source 1 long lead from gas union To middle lead from gas union 5 To outer lead from gaS union To lens purge Spectrometer purge Figure 86 Pneumatic connections 3 Label all input and outlet gas lines from the side of the gas drawer as required including the lines from the gas union and cavity Label the con nections inside the gas drawer Released MAY 2000 G2350A AED Service Manual 119 Gas Flow System Maintenance Gas drawer 4 Usea 7 16 inch wrench to remove the input line Remove the exhaust lines Use a 9 16 inch and a 7 16 inch wrench to remove the spectrometer purge line from the spectrometer Plug the spectrometer s inlet 7 Remove the mounting screw in the enclosure at the lower left foot of the drawer Remove the mounting screw on the right side of the drawer just past the gas ports Figure 87 Removing mounting screw 8 Slide the drawer partially out If needed slide the tubing from the gas union disconnect block out of the
46. system in reagent mode Released MAY 2000 G2350A AED Service Manual 164 Gas Flow System Theory of Operation Gas drawer Note that under normal operating conditions approximately 20 mL min flows out the ferrule vent Components The system consists of the following components e Gas drawer which houses most of the system e Two manifolds e Five solenoids e Tubing and fittings Gas drawer All of the AED gas system components except some tubing and fittings are contained in the gas drawer assembly The gas drawer contains e Five inlet and eight outlet ports e Five solenoids e Manifolds e One manual flow controller e Two pressure regulators e Fly ash filter Inlets and outlets There are four sets of inlet and exhaust connections on the side of the gas drawer Inlets He N H5 CH N Aux Inlet vents CH N Aux Bypasses CH N Aux Exhaust vents ferrule vent cavity vent Flow control Flow control is provided by the forward and back pressure regulators one manual flow controller five solenoids manifolds and 17 fixed pneumatic restrictors Released MAY 2000 G2350A AED Service Manual 165 Gas Flow System Theory of Operation Gas drawer Manifold 2 Distributes incoming helium to manifold 1 the high flow solenoid and the spectrometer lens purge The manifold is gauged to show incoming pressure 30 psi 207 kPa Manifold 1 e Distributes helium to the inco
47. the cavity halves together Never operate the G2350A AED when the cavity magnetron or wave guide are disassembled or mechanically loose If stray microwave emission is suspected and or measured above 5 mW cm at a distance of 5 cm shut down the instrument immediately and call the Agilent Service Department for service Note 5 mW cm at a distance of 5 cm is the amount of microwave leakage allowed from microwave ovens by the International Electrotechnical Commis sion IEC and the United States Food and Drug Administration FDA This standard is published in IEC Publication 519 6 1982 and in the Radiation Con trol for Health and Safety Act of 1968 PL90 602 section 358 Ultraviolet light To reduce risk of eye damage never operate the G2350A without the glass fil ter in the view port of the cavity Never view the plasma by looking directly into the open end of the discharge tube while the plasma is lit Released MAY 2000 G2350A AED Service Manual 59 Warning Warning Warning General Maintenance Hazard awareness The AED emits ultraviolet light that can damage the eyes if stared at for long periods of time The view port in the cavity has a glass filter that prevents ultra violet light light of wavelengths shorter than 360 nm from passing through to the viewer s eyes Effluent gases To reduce risk of breathing ozone and other harmful gases produced by the plasma vent G2350A AED effluents from the side pan
48. the five board mounting screws and remove the board from the panel Do not operate the AED with the water drawer open 8 Replace and reassemble in reverse order See also Water board on page 153 Water Flow System on page 170 Water board part no G2350 60080 on page 237 Water board part no G2350 60085 on page 239 Released MAY 2000 G2350A AED Service Manual 131 Warning Caution Water Flow System Maintenance Water board If your AED serial number is gt US01000166 Water board assembly Figure 98 Water board assembly To replace the water board assembly High Voltage To reduce risk of electric shock disconnect the power cord from the AED High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics 1 Power down the AED 2 Remove the power cord in rear of instrument 3 Lower the front facing and remove the water drawer See Water drawer on page 133 4 Label the wires leading to the pump fan and water drawer control cable if desired Remove the wires from the board Using a posi drive remo
49. the instrument for cooling A Hall Effect rotometer measures the flow rate with 1 volt output equal to 100 mL linear If the water flow drops below 250 mL minute the high voltage to the magnetron is stopped and plasma ignition is prevented The water passes through a 5 micron 70 mL capacity filter to clean any particles which have gen erated or degenerated from the gear pump head Released MAY 2000 G2350A AED Service Manual 170 Water Flow System Theory of Operation Water drawers using a flow sensor Water flow path Water flows from the lower port on the reservoir into the pump which pumps it through the filter The central outlet from the filter ends at the pressure switch while the other outlet carries the flow through the water flow sensor and into the cavity The water flows across the discharge tube out the cavity and into the heat exchanger Cooler To interlock Cavity on main board 15 volts DC From water control board Legend FS Flow sensor pump control P PS Pressure switch lt gt Interlock Figure 126 Water flow path diagram Water pump control At start up the main board waits approximately 30 seconds for the water pump to establish the correct flow rate During operation about 9 to 12 V is used to drive the pump at a flow rate of 400 mL min If the pump head is worn or if there is a restriction in the system the voltage will be increased to gain the same flow rate The hi
50. your GC and your G2350A AED before starting the Chem Station software When starting the system for the first time see First start up on page 41 Important operating tips Below is a summary of important operating tips e Donotattempt to analyze for Os if the AED is plumbed for pure methane Use of pure methane when searching for oxygen can damage the instru ment with excessive carbon buildup e measure the N 388 you must use pure methane e the helium supply pressure is set at 30 psi do not adjust it further The AED uses a system of fixed restrictions to control gas flows If the helium supply pressure is not 30 psi the reagent purge and carrier flow rates will vary by unknown amounts e Use only distilled water in the water reservoir Released MAY 2000 G2350A AED Service Manual 40 Warning Installation First start up First start up In order to verify that the AED performance meets the specifications as tested at Agilent Technologies install the checkout column and set the gas flow rates to factory standard as described below Once check out performance is verified vary the gas flow rates oven tempera ture program or columns to optimize results for the compounds being ana lyzed Install the column in the GC Install the AED checkout column 25m x 0 32 mm ID x 0 17 mm film thickness HP 1 part number 19091Z 012 as follows 1 Install column nuts and ferrules onto the column and trim
51. zones Released MAY 2000 G2350A AED Service Manual 215 Cabling Diagrams and Pinouts AC input cable assembly part no G2350 60500 AC input cable assembly part no G2350 60500 AC board 62350 60055 Remote rocker switch AC input cable assembly G2350 60500 GND greenlyellow Figure 141 AC input cable assembly Released MAY 2000 G2350A AED Service Manual 216 Cabling Diagrams and Pinouts AC main cable assembly part no G2350 60690 AC main cable assembly part no G2350 60690 Figure 142 AC main cable assembly Connector pinouts Pin Function 1 Line sense 2 24 V unreg 3 High V ON OFF 4 Water pump control 5 Magnetron overheat 6 H50 sense 7 AUX3 8 AUX2 9 AUX1 10 High V primary 11 Main relay 12 Reference GND 13 DC ground 14 DC ground 15 Reference GND 16 20 VAC 17 20 VAC C T 18 20 VAC Released MAY 2000 G2350A AED Service Manual 217 Cabling Diagrams and Pinouts Emission source sense cable assembly part no G2350 60510 Emission source sense cable assembly part no G2350 60510 Pin 1 Figure 143 Emission source sense cable assembly Connector pinouts Pin Function 1 PRT safety circuit normally not open 2 PRT safety circuit normally not open Released MAY 2000 G2350A AED Service Manual 218 Cabling Diagrams and Pinouts Gas flow system connector Gas flow system connector Pin 1 Pin 14 Figure 144 Gas flow
52. 0 Released MAY 2000 G2350A AED Service Manual 253 Replacement Parts Lens mount assembly Lens mount assembly 1 7 2 8 g b 3 f i i 1 a 100 4 5 11 6 12 Figure 163 Lens mount assembly part no G2350 60740 Number Description Part number Oty Assy Lens mount assembly G2350 60740 1 Lens mount liner G2350 22230 1 2 Lens mount cone G2350 22220 1 3 Lens mount liner O ring 0905 1451 1 4 Lens keeper O ring 0905 1099 1 5 SCR MACH M3x0 5x12mm LG 0515 0911 3 6 Lens keeper G2350 22240 1 7 Lens O ring 0905 1293 1 8 Lens G2350 80360 1 9 Lens mount top 62350 20910 1 10 Lens mount bottom 62350 21320 1 11 Screw M4x20 0515 0982 2 12 Lens mount nut 62350 20980 1 NS Lens mount liner interior O ring 0905 1162 3 NS Lens mount liner ferrule bushing 0100 1504 1 NS Lens mount liner fitting nut 0100 1505 1 Released MAY 2000 G2350A AED Service Manual 254 Replacement Parts Sparker assembly Sparker assembly co Figure 164 Sparker assembly part no G2350 60550 Number Description Part number Oty Assy Sparker assembly G2350 60550 1 Sparker PCB assembly 05921 60030 1 2 Ignition module 0960 0826 1 3 Ignition coil 9140 1516 1 4 Spark top brazement 05921 80880 1 NS 8 mm ignition wire 8120 5473 1 NS Sparker assembly cable 05921 61000 1 NS Spark fitting 05921 22056 1 Released MAY 2000 G2350A AED Service Manual 255 Spectrometer assembly Repl
53. 08 2 NS 1 4 inch barb to 1 4 inch tube 0100 1609 1 NS Plastic fitting luer tube fitting 0100 1869 1 NS Luer lock ring on filter 0100 1874 1 NS Nut hex wilkwr 0535 0031 5 NS Gasket 0905 1440 68 NS Washer flat 3050 0307 4 NS Washer flat 3050 0891 4 NS Washer flat 3050 0893 4 NS Washer fl nm 6 0 3050 1202 1 NS Washer nylon 3050 1414 2 See Figure 169 for a plumbing diagram Released MAY 2000 G2350A AED Service Manual 258 Replacement Parts Water drawer AED serial no gt 1000166 15 Figure 167 Water drawer parts Number Description Part number Oty Assy 5 RP reservoir assembly G2350 60710 1 12 Hose clamp pump and reservoir 1400 2152 6 13 Fitting barbed bulkhead 0100 1680 1 14 Restrictor 1 8 inch SS tube coil 62350 20890 1 15 Fitting tee 1 8 inch barbed 0100 1869 1 16 Water control PCB 62350 60085 1 17 AED pump cable G2350 60810 1 18 Water drawer fan assembly G2350 61070 1 19 Heat exchanger G2350 20905 1 20 Water drawer cable G2350 60755 1 21 Hose clamp SNP 2 HSO 1400 1569 8 Released MAY 2000 G2350A AED Service Manual 259 Replacement Parts Water drawer AED serial no gt 1000166 Cooler Cavity To interlock on main board 15 volts DC From water control board Reservoir Legend Water Board Control Circuit a 51 volt FS Flow sensor pump control PS Pressure switch Interlock Figure 168 Water flow path diagram vers
54. 192 BU EES C 194 No pressure at the cavity pressure gauge 195 Plasma glows brown eese 195 Plasma glOWS Dern rte dee 196 Solenoid will not operate essere 196 Troubleshooting the gas drawer 199 Spectrometer and Chromatography 200 Chromatographic peaks not sharp esses 200 Loss of UV sensitivity nennen nens 200 a PDA output not registering sese 201 Sensitivity 1S POOF cesi ice eiiis e eee eene ue 201 UV wavelengths missing eene 201 Verifying PDA performance eee 201 Water Flow SVSLELQEH sisse cei pipe S nee NUS pv aive Fa iio 202 Flow rate too low high eee 202 Pump cycles very fast then slow 208 Verifying the actual water flow rate esses 203 Water board LED diagnostics G2350 60080 only 203 Water leaks iiti xen te eee orte ta us ea uu 204 Released MAY 2000 G2350A AED Service Manual 175 General Procedures Troubleshooting Tips General Procedures Tips The following tips and techniques are designed to help diagnose AED prob lems Diagnostic descriptions in this manual cover the symptoms and corrective actions for the most common AED technical problems If a probl
55. 2000 G2350A AED Service Manual 172 Water Flow System Theory of Operation Water drawers without a flow sensor Water flow path Water flows from the lower port on the reservoir into the pump which pumps it through the filter The other filter outlet carries the flow into the cavity across the discharge tube out the cavity through a tee union to the pressure sensor and into the heat exchanger See Figure 128 Tee union To interlock on main board Pressure Fan D Water board Sensor i alga M E UE NES 1 e Water board IS volt DC from ater boar d water control Control circuit hoard Restrictor Interlock Figure 128 Water flow path diagram Water pump control At start up the main board waits approximately 30 seconds for the water pump to establish the correct flow rate During operation about 9 to 12 V is used to drive the pump at a flow rate of 400 mL min If the pump head is worn or if there is a restriction in the system the voltage will be increased to gain the same flow rate The high flow solenoid is normally off with flow blocked but in high flow mode it directs 120 mL min of helium into the main manifold to augment the makeup flow for a total flow rate between 150 mL min and 300 mL min The solvent vent solenoid 1 closes the exhaust path for gases exiting the dis charge tube This forces the window purge to back flow through the discharge tube
56. 24 V DC water pump 15 REF GND main board 7 AUX3 16 20 VAC 8 Cavity gate 17 20 VAC C T 9 HTL gate 18 20 VAC Connector P2 AC power cord Pin Function 1 Mains AC voltage 3 Mains AC voltage Connector P4 high voltage power supply Pin Function 1 Hot 2 Neutral 3 GND 4 HV enable 0 V when HVPS is on to 5 V if off Released MAY 2000 G2350A AED Service Manual 213 Connector P5 transformer Pin Function cO on Cc ao FP WO N gt Cc 12 20 VAC 20 VAC 120 VAC CT GND Line voltage Neutral Shield Line voltage Line voltage Not used Neutral Connector P6 magnetron fan Pin Function c1 A CO N Mag fan Mag fan Mag PRT Mag PRT Mag fan Mag fan Cabling Diagrams and Pinouts AC board part no G2350 60057 Released MAY 2000 G2350A AED Service Manual 214 Connector J7 Pin Function cO OO N Cc ao FP WO N gt e Transfer line heat Transfer line heat return Cavity heat Cavity heat return 120 VAC 120 VAC back Pump GND 24 V pump enable 24 V DC H30 sense A senses open ckt in wiring AC board fuses Cabling Diagrams and Pinouts AC board part no G2350 60057 Fuse Type part no Circuit F1 7A 250 V 2100 0614 Main F2 7A 250 V 2100 0614 Main F3 5A 250 V 2110 0010 High voltage power supply F4 5AJ250 V 2110 0010 High voltage power supply F5 7A 250 V 2100 0614 Heated
57. 24 V to ground which enables the water pump Possible cause Any one of the following parts problems e Spectrometer cable e Spectrometer open internal switch on the grating motor e 2 jumper cable running into the heater sensor cable Heater sensor cable Emission source sensor cable Emission source sensor switch e Water board cable Bad flow sensor or flow sensor relay on the water board e AC board J7 P1 e Main board P500 J252 pins 5 6 e Water flow obstruction No water pressure leak no water or water pump bad See also Figure 133 Main board Figure 132 AC board Figure 139 G2350A internal cabling diagram TRIAC INTERRUPT Meaning The triac controlling a heated zone has not detected a zero crossing in the line voltage and is not turning its heater on off Possible cause Faulty AC board Released MAY 2000 G2350A AED Service Manual 208 Cabling Diagrams and Pinouts Internal cabling diagram eene 210 AC board part no G2350 60057 212 AC input cable assembly part no G2350 60500 216 AC main cable assembly part no G2350 60690 217 Emission source sense cable assembly part no GFZ UCDO i era rex po Re a oH 218 Gas flow system connector essere 219 Heater sensor cable assembly part no G2350 61310 220 High voltage power supply part G2350 80075
58. 28 29 30 Check for water leaks Check for leaks at the three gas tubes leading from the gas union at the exit chamber at the tubing connections and where the gas union connects to the water chamber If there is a leak at the gas union check that the gas union nut has been sufficiently tightened with a 1 2 inch wrench and tighten the exit chamber again Correct other leaks as required Shut down the AED and reassemble if required When all leaks are fixed shut off the AED Examine the disconnect block Make sure that the three O rings are in place for the gas tubes and that the bottom interface is clean Attach the top half of the disconnect block using the thumbscrew Cover the open end of the gas union with a spare septum If the cavity pressure gauge reads above 0 there are no gross leaks Loosen the thumb nut near the cavity lower the emission source lock and tighten the two thumb nuts in the lock so that the cavity is attached to the enclosure Re attach the transfer line to the gas union Disconnect block Figure 71 Disconnect block 31 32 Start the AED The cavity pressure should read 1 5 psi If the pressure is too low or too high check for gas leaks or obstructions Released MAY 2000 G2350A AED Service Manual 103 Emission Source Maintenance Discharge tube Verifying discharge tube installation After discharge tube installation perform a quick check to verify that the installati
59. 4 Trigger module Wiring Wire Function Blue Trigger module Brown 5 V module Red 13 6 V module White GND coil to module Yellow 13 6 V coil Released MAY 2000 G2350A AED Service Manual 234 Transformer leads Cabling Diagrams and Pinouts Sparker assembly cable part no 05921 61000 Pin Function Stage 1 20 VAC yellow Secondary 2 20 VAC yellow Secondary 3 120 VAC red Secondary 4 CT blue Secondary 5 GND red Secondary 6 Line black green Primary 7 Neutral black red Primary 8 Shield green yellow Secondary 9 Line black orange Primary 10 Line black Primary 11 Not used 12 Neutral black yellow Primary Released MAY 2000 G2350A AED Service Manual 235 Cabling Diagrams and Pinouts Sparker board part no 05921 60030 Sparker board part no 05921 60030 Figure 151 Sparker board Connector J2 Pin Function 1 13 6 V 2 13 6 V to module 3 5 V to module 4 Trigger module Connector J1 Pin Function 1 5 V in 2 24 V in 3 Trigger 4 GND Released MAY 2000 G2350A AED Service Manual 236 Cabling Diagrams and Pinouts Water board part 62350 60080 Water board part no G2350 60080 Figure 152 Water board assembly revision 1 Connector J1 Pin Function 1 Enable 24 V when pump and fan are running 2 GND 3 GND 4 24 V J1 on the water board connects to the water drawer control cable G2350 60 750
60. 5 2 2 5 3 5 Figure 34 Sulfur 181 Table 13 Sample Printout of Results pg sec noise Msel supamt Psel Area C 193 nm 0 46 0 896 31719 9 CI 479 nm 9 58 0 647 2609 0 9987 12183 1624 1 H 486 nm 0 75 0 689 1304 8 N 174 nm 4 12 0 729 3431 0 9452 5463 690 6 0 171 nm 32 46 0 543 6215 1 004 16845 224 7 P 178 nm 1 05 0 275 4205 0 8036 17315 924 2 S 181 nm 0 41 0 322 9007 0 9857 24749 7751 5 Released MAY 2000 G2350A AED Service Manual 54 Installation Specifications Checkout sample composition Part Number 8500 5067 Checkout Sample 1 Composition Mixture of the following on w w basis 0 07 Nitrobenzene 5 0 043 b Tridecane C 13H 0 07 0 05 0 08 0 05 0 05 4 3 0 1396 0 0796 4 0496 4 Fluoroanisole C7H7FO tert Butyl Disulfide 9 1 2 4 Trichlorobenzene CgH3Cj3 Tetraethyl orthosilicate CgHo9SiO4 n Decane perdeuterated C10D22 n Dodecane n Tetradecane C14H30 1 Bromohexane CgH 3Br n Octane CgH g In Isooctane CgHjg as solvent Checkout Sample 2 Composition Same as Sample 1 with the addition of 0 06 Triethyl Phosphate CgH 5PO Released MAY 2000 G2350A AED Service Manual 55 Maintenance Gerieral 57 Intended S6 eon tee ene pee eene 57 General maintenance procedures 2 57 AED shutdown 00 0 ccccccecsssssssecessecesecessccecssaeessaessssecseaeecsaeeesanes 57 Hazard awareness c
61. 5 mL min Adjust the flow rate if neces sary by changing the helium supply pressure Return the flow meter to the purge vent Cycle the reagent solenoid valves ON and OFF while monitoring the flow rate The flow rate should remain relatively constant Record the flow rate with each solenoid turned ON Note that each reagent on adds approximately 5 mL min to the total flow rate Released MAY 2000 G2350A AED Service Manual 189 Gas Flow System Troubleshooting Adjusting gas flow rates Reagent and spectrometer purge gases Follow the steps described under Initial Tests and Initial Spectrometer Purge in First start up on page 41 to set the flow rates for the reagent gases and the nitrogen purge gas Released MAY 2000 G2350A AED Service Manual 190 Gas Flow System Troubleshooting Adjusting gas flow rates 02 Solenoid 51 off 02 or 02 Helium H2 Solenoid S2 off E H2 or H2 Helium He CH4 N2 Solenoid S3 off E CHA N2 or CH4 N2 helium Solvent Vent Solenoid 54 off E Static or Exhaust High Flow Solenoid 55 off Helium column flow fpr forward pressure regulator mfc manual flow controler bpr back pressure regulator mi main manifold block m2 secondary manifold block gage 1 helium head pressure gage gage 2 cavity pressure gage r1 to r17 pneumatic restrictors ferrule cavity vent vent Gas flow systems Window purge Makeup gases 4 gt Makeup Gases gt
62. 60015 1 2 AC board assembly G2350 60055 1 3 Sparker assembly G2350 60550 1 4 Remote rocker switch 3101 3444 1 5 Power supply G2350 80075 1 6 Power transformer assembly G2350 60660 1 Released MAY 2000 G2350A AED Service Manual 246 Replacement Parts Emission source assembly Emission source assembly 1 2 7 3 eem 8 8 5 3 6 Figure 157 Emission source assembly part no G2350 60560 Number Description Part number Oty Assy Emission source assembly G2350 60560 RP emission source assembly G2350 60900 1 Cavity heater PRT assembly G2350 60930 1 2 GC chamber O ring 0905 1159 1 3 Discharge tube kit G2350 61090 1 4 RP MS M5x3 80 35mm 0515 0110 3 5 Gas union assembly G2350 61190 1 6 RP heater chamber assembly G2350 60190 1 7 Optical side water chamber O ring 0905 1160 1 8 Optical side water chamber G2350 20520 1 9 Exit chamber 05921 22240 1 NS Belleville washers 3050 1907 4 NS Set screw 0515 2432 Released MAY 2000 G2350A AED Service Manual 247 Replacement Parts Front assemblies Front assemblies Figure 158 Front assemblies Number Description Part number Oty Assy 1 Thumb nut 0535 0165 1 2 Gas drawer disconnect brazement G2350 80680 1 3 O ring 0905 1162 3 4 Emission source assembly G2350 60560 1 5 Water drawer G2350 61250 1 6 Spectrometer assembly G2350 61170 1 7 Gas drawer G2350 60530 1 NS Ship kit G2350 60800 NS AED II Packaging asse
63. 8 BD3 18 BWR 9 BD4 19 DISPO 10 BD5 20 DISP1 Released MAY 2000 G2350A AED Service Manual 226 Cabling Diagrams and Pinouts Main board part no G2350 60015 Connector P100 main harness cable assembly Pin Function Pin Function Pin Function 1 Stepper motor 13 Stepper motor 25 Slit motor blue lead 2 Spark sparker 14 24 V sparker 26 BX slit encoder 3 24V 15 24V 27 5 V slit encoder 4 Solvent dump 16 Aux reagent 28 5 V unassigned 5 Stepper motor 17 24 V stepper motor 29 Array motor red lead 6 5 V sparker 18 24 V stepper motor 30 AY array encoder 7 24V 19 24V 31 GND D array encoder 8 0 reagent 20 Unassigned 32 GND D unassigned 9 Stepper motor 21 Slit motor red lead 33 Array motor blue lead 10 GND D sparker 22 AX slit encoder 34 By array encoder 11 24V 23 GND D slit encoder 35 5 V array encoder 12 reagent 24 Slit motor shield 36 Array motor shield Connector J102 APG remote Pin Function J102 1 GND D J102 2 J102 3 START J102 4 J102 5 J102 6 PWRON J102 7 READY J102 8 STOP J102 9 Released MAY 2000 G2350A AED Service Manual 227 Cabling Diagrams and Pinouts Main board part no G2350 60015 S100 GPIB address When set for GPIB address 15 the default the switches are set as shown below Switch Function Setting 100 1 Test Down 100 2 SRO Down 100 3 Not used Down 100 4 ADDR 16 Down 100 5 ADDR 8 Up 100 6 ADDR 4 Up 100 7 ADD
64. 9 Reinstall the firewall and the top lid Route the PDA cable ground wire and sparker wire through the cutout in the bottom of the firewall to avoid crimping 20 Install the front lid and lift it slightly to remove it from the retaining arm lightly press the arm inward and close the lid Close the front facing 21 Make sure you have removed all parts and paperwork from the shipping box before storing or discarding it Released MAY 2000 G2350A AED Service Manual 26 Installation Uncrating your AED Contents list ELE Figure 10 Parts shipped You should have received the following parts and manuals in the AED shipping box Table 9 Contents List Part Number Description UM Qty 0100 0053 1 16 inch gas union SS tubing nut EA 1 0100 0090 Tee union brass EA 2 0100 1326 Ferrule 1 16 inch graphite 10 pk PK 1 0100 1328 Ferrule 1 8 inch Vespel 10 pk PK 1 0100 1329 1 16 inch Vespel ferrule 10 pk PK 1 0905 1293 Lens O ring EA 1 0905 1099 Lens keeper O ring EA 1 0905 1159 GC side cavity O ring EA 1 0905 1160 Optical side cavity O ring EA 1 0905 1162 O ring EA 3 0905 1451 Lens mount liner O ring EA 2 3150 0417 Filter tube flyash EA 1 5080 8853 Transfer line graphite ferrule 0 5 mm 10 pk PK 1 5180 4103 Nut 1 8 inch brass 10 pk PK 1 5181 8830 Column nut 2 pk PK 1 8120 3446 GPIB cable 2m EA 1 various Power cord EA 1 Released MAY 2000 G2350A AED Service Manual 27 Installation Connecting control cables
65. D Checkout sam ple Adjust manually controlled reagent gas flow rates If any of your reagent gas flow rates are controlled manually or if you are using an 5890 GC you must adjust them as described in this section If small adjustments to the flow rates of the reagent gases still cannot solve a problem found during this procedure contact your Agilent service representa tive To adjust the reagent gas flow rates follow the instructions below Prepare to set the gas flow rates l Display the Method and Run Control View Then display the AED spectral plot by selecting View AED Spectral Plot On Off 2 Realign the instrument by selecting the Realign bar on the spectral plot screen 3 When alignment finishes after approximately 5 min enter 725 nm as the wave length and select the Go To bar 4 When the spectrometer arrives at 725 nm turn the oxygen ON from the ChemStation Set the oxygen pressure 5 Measure the area of the oxygen 725 line by placing the mouse cursor over the peak and pressing the left mouse button Record the value for use in step 7 6 Select the helium 728 line and determine its area Record the value for use in step 7 7 The ratio of the oxygen 725 to helium 728 line areas should be 0 12 0 01 If the ratio is greater than 0 13 decrease the oxygen pressure at the oxygen regulator If the ratio is less than 0 11 increase the oxygen pressure Perform steps 5 through 7 until the ratio is correc
66. D Service Manual 147 Electronics Theory of Operation AC board Input voltages listed by country The AED can operate using any one of the following voltages Table 19 Input Voltages V AC Country 100 V Japan 120 V USA 220 230 V Europe 240 V USA Voltage selection settings Two switches S1 and S2 are factory preset to select the incoming line voltage according to country of use Refer to the following chart for voltage selection settings according to country Table 20 Voltage Selection Settings Country V AC 1 Setting S2 Setting Japan 100 up down USA 120 up up Europe 220 230 down down USA 240 down up See also Voltage Selection Switch Settings on page 74 Heated zones There are two zones in the AED which require heating in order to operate prop erly e The transfer line Q1 e The cavity Q2 The temperature of these two heated zones is controlled by the main board using a relay and opto isolators on the AC board The main board uses thermal sensor data to determine whether to turn the heating ON or OFF The board can control a third heated zone Q3 but this zone is not used on the G2350A See also Table 23 in chapter 4 Diagnostics Released MAY 2000 G2350A AED Service Manual 148 Electronics Theory of Operation AC board Opto isolator The AC board uses three opto isolators to control the power to the heaters The opto isolators isolate 120 V AC and deliver it to the triacs controlli
67. First start up on page 41 Connecting the nitrogen purge 1 Using a 7 16 inch open end wrench connect the nitrogen purge line to the Nitrogen Purge line on the side of the AED See Figure 14 2 Setthe nitrogen pressure to 40 psi at the source The AED uses a fixed restrictor to control the purge flow rate Tank pressures above 40 psi may cause higher flow rates that can damage the AED Tank pres sure below 40 psi may not yield optimal purging Released MAY 2000 G2350A AED Service Manual 30 Installation Connecting gas piping It may take several hours before the AED will reach its maximum sensitivity in the UV range due to light adsorption by and water inside the spectrometer However initial set up tests can be performed right away Connecting other gas lines Warning Hydrogen Gas To reduce risk of explosion fire and injury ensure that hydro gen gas is only connected to the gas inlet on the side panel labeled HYDROGEN Hydrogen Gas To reduce risk of explosion fire and injury ensure that the hydrogen gas flow is turned off at the source and in the AED before starting this procedure Effluent Gases To reduce risk of breathing ozone and other harmful gases pro duced by the plasma turn off all reagent gas flows and the column flow before starting this procedure For GCs without Electronic Pressure Control EPC connect the gas source directly to the AED using ferrules and two 7 16 inch wrenches S
68. G2350 60085 1 Water drawer cable G2350 60755 1 Clamp 1400 1569 2 Restrictor G2350 20890 1 Reducer fitting 0100 0121 1 See Figure 168 for a plumbing diagram See Water drawer AED serial no gt 1000166 on page 257 for additional replacement parts Released MAY 2000 G2350A AED Service Manual 262
69. Manual 14 Installation Preparing your work station Computer with monitor example only Hx Wx D 40 x 42 x 51 cm 20 x 17 x 16 inch with monitor Power Outlets 2 Heat Weight NIA Required clearance Behind 29 cm 11 inch for Injector 1 side 25 cm 10 inch for Tray Front see keyboard Computer keyboard example only HxWxD 5 x 46 x 18 cm 2 x 18 x 7 inch with monitor Laser printer HxWxD 30 x 42 x 41 cm 12 x 17 x 16 inch Power 300 Vac max Heat Outlets 1 Weight 16 8 kg 37 Ibs Required clearance Behind 15 cm 5 inch Table 2 Overall GC AED ChemStation Space Requirements Space 1 m high x 3 4 m wide x 87 cm deep 37 inch x 11 ft x 34 inch Weight capacity 123 3 kg 271 3 lbs plus computer and keyboard Other space requirements The AED requires the use of four to six gas cylin ders for the makeup and reagent gases as well as a space for a nitrogen purge supply dewar or generator and a helium getter required Released MAY 2000 G2350A AED Service Manual 15 Installation Preparing your work station Table 3 G2350A AED Environmental Conditions Condition Operating Range Temperature 10 C to 40 C Relative Humidity 80 max for temperatures up to 31 C decreasing linearly to 50 at 40 C Altitude up to 2000 m Main voltage fluctuations not to exceed 10 of nominal voltage Recommended ambient temperature is 15 C to 35 C
70. Power supply Water board see Water Flow System on page 122 AC input cable AC input wiring assembly Heater sensor cable assembly Main harness cable assembly PDA to main cable assembly Remote rocker switch Released MAY 2000 G2350A AED Service Manual 70 Warning Caution Electronics Maintenance Tools needed Tools needed Posi drive 5 mm nut driver 7 mm nut driver Chip puller Flat head screwdriver Two 9 16 inch open end wrenches Connector pin punch Connector pin installer Grounded wrist strap part number 9300 0969 large or 9300 0970 small Grounded work mat AC board Replacing the AC board Replace the AC board as described below High Voltage To reduce risk of electric shock disconnect the power cord from the AED The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics 1 Turn off the AED and unplug from main power 2 Open the top cover and remove the front lid 3 Remove the two wires leading to the power switch Released MAY 2000 G2350A AED Service Manual 71 Electronics Maintenance AC hoard Figure 44 Removing connectors from AC board 4 Remove connectors J7 P6 P1 P5 and the two leads from P2 to the remote rocker switch Remove the four mounting screws using a po
71. R 2 Up 100 8 ADDR 1 Up See the instructions for installing the ChemStation software for other address settings Released MAY 2000 G2350A AED Service Manual 228 Connector J100 GPIB communications Pin Function Pin X Function 1 0101 13 0105 2 0102 14 0106 0103 15 0107 4 0104 16 0108 5 EOI 17 REN 6 DAV 18 DCOM 7 NRFD 19 DCOM 8 NDAC 20 DCOM 9 IFC 21 DCOM 10 22 DCOM 11 ATN 23 DCOM 12 SHLD GND D 24 LOGIC Main board test points Test point Reading TP500 GND TP501 24V TP502 24V TP526 5V TP550 15V TP551 15V Main board fuses Fuse Type part no F500 5A 250 V fast acting 2100 0010 F501 5A 250 V fast acting 2100 0010 Cabling Diagrams and Pinouts Main board part no 62350 60015 Released MAY 2000 G2350A AED Service Manual 229 Cabling Diagrams and Pinouts Main harness cable assembly part no 62350 60680 Main harness cable assembly part no G2350 60680 To sparker To gas flow assembly J1 drawer To emission source sense cable Pin 1 To main PCB P 100 To spectrometer Figure 148 Main harness cable assembly Released MAY 2000 G2350A AED Service Manual 230 Cabling Diagrams and Pinouts Main harness cable assembly part no 62350 60680 Connector to sparker board J1 Pin Function 1 5Vin 2 24 V in 3 Trigger 4 GND Connector to spectrometer Pin Function Color 1 Stepper motor Black 2 Switch close
72. Released MAY 2000 G2350A AED Service Manual 237 Cabling Diagrams and Pinouts Water board part 62350 60080 Connector J2 Pin Function 1 15V 2 Flow sensor input normally 3 75 to 4 30 V 3 GND J2 on the water board connects to the flow sensor Connector P1 Pin Function 1 Red 2 NC 3 Black 1 on the water board connects to the pump Voltage across 1 3 is 9 to 21 V DC 9 12 V nominal Connector P2 Pin Function 1 15 V fan 2 GND 3 NC 4 NC 5 6 GND 15 V fan P20n the water board connects to the fan Connector P3 Pin Function 1 NC 2 NC 3 PRT 4 PRT shutdown on the water board connects to the water drawer control cable G2350 60750 Released MAY 2000 G2350A AED Service Manual 238 Cabling Diagrams and Pinouts Water board part 62350 60085 Water board part no G2350 60085 Figure 153 Water board revision 2 Connector J1 Pin Function 1 Enable 24 V when pump and fan are running 2 GND 3 GND 4 24 V J1 on the water board connects to the water drawer control cable G2350 60755 Connector P1 Pin Function 1 Red 2 NC 3 Black P1 on the water board connects to the pump Voltage across 1 3 is 9 to 21 V DC 9 12 V nominal Released MAY 2000 G2350A AED Service Manual 239
73. TIME M The method should include any changes to the default set tings made during First start up on page 41 Run the method Select Run Control Run Method For the perfor mance calculations to work correctly the retention time of the t butyldis ulfide must be between 2 115 and 2 150 minutes If the retention time of the peak is in the correct range the message retention time of sulfur peak OK is printed If the retention time is outside the required window the message Suggested pressure change psi X XX is printed where X XX is the amount by which the column inlet pressure should be changed to bring the peak into the window Adjust the column inlet pressure Repeat step 7 until the retention time for the sulfur peak is between 2 115 to 2 150 minutes Save the modified method Select Method Save Method Overwrite the earlier version Print the method parameters Select Method Print Method The parameters will be used to modify methods CKO RUNI M and CKO RUN2 M Load method CKO_RUN1 M Select Method Load Method CKO RUN1 M Modify the default settings listed in the method for the oxygen hydrogen auxiliary gas and or column inlet pressures as needed to match the print out of method CKO TIME M Select Instrument Edit Parameters e Clickonthe Aux icon Select the appropriate reagent gas and modify the settings e COlickonthe Inlets icon Modify the inlet pressure as required e Save the new settings Select M
74. XXXXX Pin 1 Pin 14 Figure 155 Water drawer control cable assembly Connector to heater sensor cable pinouts Pin Function 1 NC 2 NC 3 GND for cabling ckt closed sensor 4 24 V 7 24 V enable 10 Shorted to 13 11 PRT ckt to pressure switch and flow sensor 13 J252 5 from main board PRT ckt Shorted to 10 110 ohms 14 J252 6 from main board PRT ckt Connector to pressure switch Should read 110 ohms nominal or open when system is down Released MAY 2000 G2350A AED Service Manual 242 Connector to water board J1 Cabling Diagrams and Pinouts Wires water board to flow sensor and pump Pin Function 1 Enable 24 V when pump and fan are running 2 GND 3 GND 4 24 V Wires water board to flow sensor and pump Pump Pin Function 1 Red 2 NC 3 Black Voltage across 1 3 varies from 9 21 V 9 12 V nominal when new Fan Pin Function 1 15V 2 GND 3 NC 4 NC 5 NC 6 NC Flow sensor if used Pin Function 1 15V 2 Output normally 3 75 4 25 V 3 GND Released MAY 2000 G2350A AED Service Manual 243 Replacement Parts IntrOdUCliOLi uo eer pe ert tree ten o eee ree eto te E ER 245 Electrical components esses eese i iiei nnne 246 Emission source assembly eese enne 247 Front assemblies ccessccsssssecssssrscsssseecessenecsesseccssnseecsssseeessnsees 248 Gas drAWGE ite ene ad 249 Heated trans
75. ace the discharge tube as described below Column Lah tissues trimming tool Nylon screw Column cutting tool Correction fluid DB charge tube kit Figure 64 Tools for replacing the discharge tube Warning Wear safety glasses when performing this procedure 1 Move the cavity into the service position See Moving the cavity assembly to the service position on page 91 2 Often the lens mount liner O ring becomes stuck to the exit cone Gently remove the O ring Inspect the O ring for damage Use a new O ring if needed Replace it into its seat in the lens mount liner Figure 65 Exit chamber Released MAY 2000 G2350A AED Service Manual 98 Emission Source Maintenance Discharge tube Warning The edges of the exit cone may be sharp 3 Using lab tissue to cover the sharp exposed edge of the exit cone unscrew the exit cone from the cavity assembly and remove Using a 5 16 inch wrench and the 1 2 inch wrench supplied in the Agilent ship kit loosen the gas union from the cavity Figure 66 Removing the gas union 5 The discharge tube extends into the gas union but rests in the cavity assembly Gently pull the gas union straight back away from the cavity until the discharge tube is completely clear If you angle the gas union while pulling it out you will break off the discharge tube in the cavity Using needle nose pliers gently rotate the discharge tube ferrule enough to break the seal between the tub
76. acement Parts Spectrometer assembly 3 1 7 4 5 6 Figure 165 Spectrometer assembly part no G2350 61170 Number Description Part number Oty Assy Spectrometer assembly G2350 61170 1 PDA assembly 62350 60630 1 2 Mounting screw 62350 20700 2 3 O ring 0905 1433 1 4 Lens mount assembly G2350 60740 1 5 Mounting screw 0515 0982 2 6 O ring 0905 1435 1 7 Spectrometer G2350 60720 1 Released MAY 2000 G2350A AED Service Manual 256 Replacement Parts Water drawer AED serial no gt 1000166 Water drawer AED serial no gt 1000166 2 6 3 3 7 8 5a 5b Figure 166 Water drawer AED serial no 1000166 to 03000388 Water drawer for AED serial no gt 03000388 is similar Released MAY 2000 G2350A AED Service Manual 257 Replacement Parts Water drawer AED serial no gt 1000166 See Figure 166 for an illustration of the water drawer Number Description Part number Oty Water drawer G2350 61250 1 Water board panel 62350 00470 1 2 Rubber tubing 0890 2104 154 cm 3 Tubing per cured si rubber 0890 1831 57 cm 4 Reservoir clip 62350 00480 2 RP reservoir assembly 62350 60710 1 5b Reservoir 1540 1724 1 6 Water pump assembly G2350 61445 1 7 Plastic clamp on filter deadend 1400 1660 1 8 0 5 um water filter element 62350 80300 1 NS 1 8x1 4 SS reducing union 0100 0121 2 NS Adapter tube SS 1 8 inch hose 1 4 inch 0100 1464 1 NS 1 4 inch barb to 1 8 inch male SS 0100 16
77. acket Screws Figure 18 Mounting bracket installed in oven transfer line shown installed in bracket Remove the heated core from the insulation tube Using two 5 16 inch wrenches remove the plug from the left end of the gas union 5 Install a 1 16 inch stainless steel nut part no 0100 0053 and a 1 16 inch graphite ferrule part no 0100 1326 10 pk onto the heated core at the gas union side Note that the pictures in this documentation show stainless steel ferrules for visibility Figure 19 Ferrule and nut 6 Slide the heated core into the insulation tube 7 Slide the heated transfer line assembly through the GC outer wall and into the GC oven Released MAY 2000 G2350A AED Service Manual 34 Installation Installing your transfer line Figure 20 Installing transfer line assembly 8 Orientthe AED so that e The centerline of the gas union fitting is precisely aligned with the centerline of the hole through the GC e heated transfer line will protrude at least 1 inch 2 5 cm into the GC oven after it is installed onto the AED e Leave as much of the transfer line outside the GC as possible to make maintenance easier See Figure 22 below 4 6 10 Axis of transfer line gas union spectrometer must be parallel to the front of the GC AED GC Y A 5 8 cm Figure 21 GC AED alignment 9 Using two 5 16 inch wrenches install the heated core o
78. al 166 Gas Flow System Theory of Operation Solenoids Example of reagent and helium flow When oxygen is selected during basic operational flow mode about 20 mL min flows from the cylinder regulator to the restrictors R1 and R4 Most of the gas flows out R1 to the O vent on the gas drawer front panel and approximately 0 1 mL min flows through R4 A flow of approximately 4 mL min of helium exits through manifold 1 passing through R7 and merges with the oxygen to help carry it more quickly This mixture flows through R10 at about 4 mL min and joins the main gas flow in the lower portion of manifold 1 The majority of the mixture flows into the cavity and small amounts flow out through R11 R12 and to the bypass vent The total makeup and reagent flow is about 50 mL min A flow of 20 mL min is used to purge the column ferrule giving an actual makeup flow into the plasma of approximately 30 mL min If two reagents are turned on the total flow is approximately 60 mL min and the actual makeup flow into the plasma is approximately 40 mL min Spectrometer lens purge A flow of 25 mL min of helium passes a pressure gauge and over the spectrom eter lens to keep it clean and dry This flow is never turned off under normal conditions Solenoids The main board controls five solenoids which direct the flow of gases within the gas flow system Each solenoid is triggered by a 24 V signal from the main board The solenoids are normally in the c
79. an analytical device which uses the characteristic energy emitted by atoms in a plasma state to identify the substances present in an input gas flow Input gas from the GC is fed through a transfer line and into the AED It is joined by a stream of makeup gas containing additional reagents and flows through a cavity where the gases are ionized into plasma by electrical and microwave energy Because of the high energy state in the plasma the sub stances are broken down into atoms ions or free radicals As they return to ground state they emit radiation light in characteristic bandwidths This radi ation travels through a lens and into a spectrometer The gases are vented The light entering the spectrometer passes through a narrow slit and is reflected by a mirror onto a reflective holographic grating The grating breaks the light into discrete bandwidths and disperses the light along a flat focal plane See Figure 107 below A motor rotates the grating to reflect the desired range of wavelengths onto a second mirror and then onto a photo diode array PDA The PDA determines the specific characteristic wavelengths present and transmits this data to the AED main board and the ChemStation software The data is analyzed and the composition of the input gas is determined N F S 3 170 nm C focal 7a As 250 nm C Br 3 480 nm C D 559m F 690 nm N 746 nm O 777 nm Figure 107 Focal plane diagram with common
80. anual 201 Water Flow System Troubleshooting Flow rate too low high Water Flow System Flow rate too low high Problem Possible cause Suggested actions Water flow rate too low or too Flow restriction or worn Check the voltage across pins P1 1 and P 1 3 on the water high SPECTR NO WATER mes pump board Normal voltage is 9 12 V A reading of 20 V indi sage and frequent discharge cates a restriction or pump problem Replace the water fil tube breakage ter clean the cavity and blow pressurized air through the cavity and hoses to remove any debris which may be lodged inside Average pump life is 18 24 months of constant use Replace the entire pump if the voltage remains high after cleaning See Figure 139 G2350A internal cabling diagram and Figure 153 Water board revision 2 Water flow sensor if used If the flow oscillates between high and low and the water is defective filter is properly installed so that the outlet fitting is in the topmost position replace the flow sensor See Figure 152 Water board assembly revision 1 If the pump is 1 year old or less check the pump drive volt age If the voltage is approximately 24 V or approximately 6 V replace the sensor Water board is defective Replace and re test Released MAY 2000 G2350A AED Service Manual 202 Water Flow System Troubleshooting Pump cycles very fast then slow Pump cycles very fast then slow Problem Possible cause Suggested acti
81. asses through a fused silica lens and through a slit in the spectrometer The lens prevents cavity gases from entering the spectrometer A constant helium purge on the cavity side keeps the lens clean and free of contamination Inside the spectrometer the light is reflected off two fixed mirrors and a move able holographic grating The holographic grating disperses the light into discrete vertical bands and focuses them in a horizontal plane These charac teristic bands are ordered by wavelength from 160 nm on the left to 800 nm on the right Since the PDA is not wide enough to measure all of the bandwidth at the same time a motor is used to rotate the grating so that only a 20 to 26 nm bandwidth is reflected onto the PDA at any one time The grating rotates through about 5 nm per second so that about two minutes are required to move from 160 nm to 800 nm See Figure 108 below Mirror SN Rotating w grating Figure 108 Light path Released MAY 2000 G2350A AED Service Manual 144 Optical Assembly Theory of Operation PDA Moisture and oxygen in the spectrometer cause a loss of sensitivity particu larly in the UV range To prevent this the unit is purged with 400 mL min of nitrogen A short tube acts as a restrictor to maintain an internal back pressure of 0 5 psi A fixed restrictor in the spectrometer inlet controls the purge flow rate when the nitrogen pressure is set at 40 psi at the tank A switch is mounted
82. ation is impedance matched by the wave guide transformer and focused on the discharge tube by the cavity chamber As the spark generated by the ignition module travels through the microwave energy the microwave energy ionizes the gases in the discharge tube and the plasma is formed The magnetron is controlled by the main board through the high voltage power supply and is cooled by a variable speed fan Emission source safety switch A safety switch is located on the enclosure wall behind the emission source and the water drawer This switch is in series with the switch on the spectrom eter grating motor and with the cavity PRT so that when it opens the main board assumes the cavity is too hot and prevents high voltage from reaching the magnetron This feature ensures that the AED magnetron shuts down if the water drawer is opened while the cavity and emission source assembly are attached to it See also Plasma shut off circuits on page 177 Released MAY 2000 G2350A AED Service Manual 156 Gas Flow System Theory of Operation Overview Gas Flow System Overview The gas flow system in the AED controls the flow of five gases which are used to generate plasma increase test sensitivity and purge sensitive items of con tamination Sample gases flow from the column into the transfer tube where they are merged with makeup and reagent gases before entering the discharge tube Gases exiting the discharge tube are vented to the front of t
83. ator The 5 V DC is used by the processors on the main board and the 15 V DC is used on the sparker board the AC board other sections of the main board and the PDA Processor CPU RAM and ROM The main processor of the AED is a Motorola 6809E microprocessor It talks to ROM power fail protected static RAM a capacitor is used to maintain RAM settings during a power failure a dual port RAM shared with the A D proces sor and a dynamic RAM buffer The I O system includes a front panel display GPIB valve drivers three motors remote start stop three heated zones and various on off controls for microwaves lamps and water cooling control GPIB communications control A GPIB address is factory set for proper parallel communication between the AED I O bus and the ChemStation The address is set by manual switches and is not software selectable Motor control The main board controls the stepper motor which focuses the mirror reflecting emitted light onto the PDA assembly Control logic automatically aligns the system to correspond with the detection bandwidth input by the user PDA control The main board receives the raw analog data coming from the PDA preampli fier converts it to digital data and routes it through the I O Bus to the GC AED ChemStation Solenoid control The main board controls the five gas flow solenoids based on reagent makeup selection and total gas flow requirements input by the user Drive t
84. ayed it can be brought up by selecting View AED Real Time Spectral Plot on off Once the spectral plot is displayed the AED status can be checked from the ChemStation Released MAY 2000 G2350A AED Service Manual 42 Installation First start up 15 Load method CKO TIME M Select Method Load Method TIME M The following parameters will be automatically loaded Table 11 Checkout Parameters GC Parameters Oven Initial Temperature Initial Time Rate Final Temperature Final Time Inlet Temperature 60 C 0 30 C min 180 C 0 250 C AED Parameters Transfer line temperature Cavity Temperature Solvent Vent Time 250 C 250 C On at 0 75 min Off at 0 90 min ALS Parameters Sample 1 Sample 2 Injection volume Sample pre wash Solvent A wash Sample pumps Position 1 Position 2 1uL 4 4 6 16 For GCs without Electronic Pressure Control EPC also set the following 1T 18 GC parameters Inlet liner type Split vent setting Septum purge Split ratio split part no 5183 4647 7 5 10 2 5 5 17 5 2 Turn OFF all reagent gases using the ChemStation Note Verify the col umn inlet pressure is set at 20 psi or at the value saved during a previous performance verification Adjust the pressure if needed Connect a flow meter to the purge vent Measure the flow rate and record Turn off the makeup flow The cavity pressure should drop b
85. below e Ifthe macro cannot determine an acceptable flow rate try to adjust the pressures manually as described in Adjust manually controlled reagent gas flow rates on page 45 e fsmall manual adjustments to the flow rates of the reagent gases still can not solve a problem found during this procedure contact your Agilent ser vice representative To adjust the reagent gas flow rates follow the instructions below l Display the Method and Run Control View If full menus are not displayed select View Full menu Then display the AED spectral plot by selecting View AED Spectral Plot On Off 2 Realignthe instrument by selecting the Realign bar on the spectral plot screen 3 When alignment finishes after approximately 5 min enter 725 nm as the wave length and select the Go To bar 4 When the spectrometer arrives at 725 nm turn the oxygen ON 5 Select Instrument AED Utilities Auto set reagent gases A macro will begin and will automatically set your EPC reagent gas pres sure s to the optimum values for default performance Released MAY 2000 G2350A AED Service Manual 44 Installation First start up 6 Savethe EPC settings inthe CKO TIME M method Select Method Save Method Overwrite the earlier version These pressure setpoint values are a starting point for measurement and for performance verification as described in Verifying performance on page 47 and may require additional adjustment after running the AE
86. bled or mechanically loose If stray microwave emission is suspected and or is measured above 5 mW cm at a distance of 5 cm shut down the instrument immediately and call the Agi lent Service Department for service 5 Unplug the heater sensor cable from the connector at the back of the emis sion source assembly Loosen the wire guide bracket on the heater PRT wires and free the wires Pull the heater PRT assembly out of the cavity Cut the wires 0 c 9 Loosen the two screws that secure the connector in the emission source assembly and remove the connector 10 Punch the old heater and PRT pins from the connector with an AMP pin extractor Released MAY 2000 G2350A AED Service Manual 96 Emission Source Maintenance Cavity heater PRT assembly 11 Install the wires into the connector according to the pin chart below Table 17 Pin Chart Connector Pin No Wire 1 5 Not used 6 PRT sensor 7 PRT sensor 8 Cavity heater 9 Not used 10 Cavity heater 11 Fan red 12 Fan black 13 Magnetron sensor 14 Magnetron sensor 12 Push the heater through the grommet then push the PRT through it 13 Install the heater and PRT in the cavity and install the connector in the emission source assembly Secure the wires with the guide bracket See also PRT resistance vs temperature on page 179 Released MAY 2000 G2350A AED Service Manual 97 Emission Source Maintenance Discharge tube Discharge tube Repl
87. ccccsscccsssececsssneecsesneccessaececeseececseaeeeeesaes 58 Optical Assembly 5 se eec i iea 61 PDA fc 62 Spectrometer ccceccesssecsssecssecesecssscescececesseesaesseaecsesuecsaeessenes 63 Spectrometer assembly eese enne 67 Spectrometer lens esses i entren 67 Lens mount assembly esee eene 69 Electronics 70 tetto na teen 71 High voltage power supply esee 75 Service display board essen 76 Maint DO ard S 77 Sparker board ccce eee eae irre en 81 5d eerie tue eerie elei esta Tete eda peces 84 Emission Source 5 ie 86 Cleaning the cavity sess nens 87 Moving the cavity assembly to the service position 91 Replacing other emission source assembly hardware 94 Cavity heater PRT assembly esee 95 Discharge eiut esee dengue 98 Emission source assembly essen 105 Gas Flow SYStOM etre Red ERES 108 Accessing the gas drawer 109 Changing gas cylinders eese 111 Column installation changing columns 112 Solenoid valve assembly essere 115 Replacing related components essere 116
88. ce on them AED shutdown If it becomes necessary to shut down your unit for one day or more follow the procedures below 1 Turn the AED power off Turn off all gases except the nitrogen purge to the spectrometer 2 3 Allow the water to cool to ambient temperature 4 Drain all water from the system 5 Purge all water lines in the AED with helium or nitrogen gas to dry them off Released MAY 2000 G2350A AED Service Manual 57 Warning General Maintenance Hazard awareness Hazard awareness This manual contains safety information that should be followed to ensure safe operation There are seven potential safety hazards which the user should be aware of when using the AED These are described as follows High temperature High voltage Microwaves Ultraviolet light Effluent venting Hydrogen gas as ee cuo cbe CES Insulation High temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambient temperature or wear heat resistant gloves High temperature heated zones in the G2350A AED include the column trans fer line cavity assembly and the water bath The column transfer line is surrounded by an insulated sleeve enclosed in a metal tube Although the tube surface of the transfer line can get hot it is safely contained within the GC except for a few inches between the GC and AED which are surrounded by rigid p
89. charge tube ete ee ut e ete ite 98 Verifying discharge tube installation esee 104 Emission source assembly s essssseseeeeeeeeenee nennen 105 Gas Flow System Replaceable components neenon 108 Tools needed ie cete tte eit EE E ES ene e cone eene ee 108 Accessing the gas drawer enne nee tenente netten 109 Changing gas cylinders sese nen 111 Column installation changing columns eee 112 Solenoid valve assembly sess 115 Replacing related components eene ener nnn 116 Bly ash Der acca disce erret T erae rene eene dee neg Oan a 116 Gas dra Wet soe etel ts ipid en tete ue etu eiae 118 Insulated jacket assembly and heated core sss 121 Water Flow System Replaceable Components esses enne nennen enne 122 Tools needed se ere Here 122 Keeping clean water in the system esses enne 122 Pressure SWitCh eee e rh reet 123 Water PUnip aire eerie eee eaae eae ear tie ci pedi re et 124 Prepare for service to onset 125 Replace the water pump s eeeeeeeeeeee enne enne nnne nennen nens 125 Installing th
90. ching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Power down the AED and remove the power cord 2 Remove pull out the water drawer Replace the water pump There are three types of water pump installations as shown in Figure 91 below Follow the instructions for the type of installation you have Installation Type See Page Type 1 126 Type 2 128 Type 3 129 Released MAY 2000 G2350A AED Service Manual 125 Water Flow System Maintenance Water Pump Type 1 Hose clamp on water drawer base Type 2 Bracket on side of water drawer AED serial number lt US01000166 AED serial number between US01000166 and US03000388 Type 3 Bracket on water drawer base AED serial number 2 US03000388 Figure 91 Water pump installation types See your Service Manual for details on general procedures such as how to remove and reinstall your water drawer Installing the water pump in a Type 1 water drawer For this type of installation you will remove the bracket from the new pump and install it in the existing mounting clamp 1 Remove the water board panel and water board Released MAY 2000 G2350A AED Service Manual 126 Water Flow System Maintenance Water Pump A Hoses and clamps E Figure 92 Removing the Type 1 water pump Caution When removing the fittings from the pump head hold t
91. cket and remove the bracket Re install the two spectrometer screws and lockwashers in the spectrometer Pull the two foam supports from under the front of the spectrometer Attach the spectrometer cable to the spectrometer Attach the nitrogen purge line to the spectrometer using 7 16 inch and 9 16 inch open end wrenches Use a 7 mm wrench or socket driver to loosen the two nuts securing the firewall behind the spectrometer and emission source Then remove the firewall Remove the foam from behind the emission source lock Remove the two rear cushions from beneath the spectrometer Released MAY 2000 G2350A AED Service Manual 23 Installation Uncrating your AED Remove foam packing Figure 6 Remove foam packing Released MAY 2000 G2350A AED Service Manual 24 Installation Uncrating your AED Remove foam packing Figure 7 Remove foam packing 16 Slide the water drawer out Remove the block and cushion from between the water drawer and the cavity assembly Replace the water drawer Released MAY 2000 G2350A AED Service Manual 25 Installation Uncrating your AED Remove emission source packing Figure 8 Remove emission source packing 17 Remove the lockwashers from beneath the emission source lock thumb nuts Re install the thumbnuts Figure 9 Remove lockwashers and re install the thumbnuts 18 Optionally remove the bracket from the top of the high voltage power supply 1
92. clean methanol and lab tissue Do not attempt to clean the lens when it is inside the receiver since the O rings holding it in place will absorb the methanol 3 Hold the lens up to the light and make sure there are no fingerprints dirt or discolored areas 4 Ifthe center is a different color or if the lens shows any damage discard it and replace it with a new lens Lens mount assembly For instructions on how to remove the lens mount assembly and related hard ware listed below for replacement see Spectrometer on page 63 Lens mount assembly including e Lens keeper e Lens keeper O ring e Lens mount cone e Lens mount liner e Lens mount liner O ring Released MAY 2000 G2350A AED Service Manual 69 Electronics Maintenance Replaceable components Electronics The AC board sparker board and power supply are easily replaced In general no repairs are made to them in the field The main board can be upgraded in the field by the Customer Engineer but again it is replaced rather than repaired once it is determined to be defective Replaceable components Main board assembly e ROM upgrades only Agilent Customer Engineer only e Fuses Agilent Customer Engineer only AC board assembly e Fuses Agilent Customer Engineer only Sparker assembly e Sparker PCB assembly e Sparker assembly cable e Spark top brazement e Ignition module e Ignition coil e 8mm ignition wire Power transformer assembly
93. co N Transfer line heat fan red Transfer line heat return fan black Magnetron source Magnetron source Released MAY 2000 G2350A AED Service Manual 221 Cabling Diagrams and Pinouts Heater sensor cable assembly part no G2350 61310 Connector to cavity assembly Pin Function 1 5 Not used 6 Cavity PRT 7 Cavity PRT 8 Cavity heater 120 VAC 9 Not used 10 Cavity heater 120 VAC 11 Fan red 12 Fan black 13 Magnetron PRT 14 Magnetron PRT Connector to water board control cable Function NC NC GND 24 V enable 24V GND for cabling circuit closed sensor Connector to heated transfer line pinouts Pin Function 1 Transfer line heater 120 VAC 2 Transfer line heater 120 VAC 3 Transfer line PRT 4 Transfer line PRT Connector to emission source sense cable Pin Function 1 PRT safety circuit normally not open 2 PRT safety circuit normally not open Released MAY 2000 G2350A AED Service Manual 222 Cabling Diagrams and Pinouts High voltage power supply part no G2350 80075 High voltage power supply part no G2350 80075 Figure 146 High voltage power supply Connector to the AC board Pin Function 1 Hot 2 Neutral 3 GND 4 HV enable 0 2 0 3 V when high voltage is enabled 5 V if off Released MAY 2000 G2350A AED Service Manual 223 Cabling Diagrams and Pinouts Main board part no 62350 60015 cO ee imam m 1 7 SC
94. cuit will not activate again until it sufficiently de energizes It will take three minutes minimum for the circuit to de ener gize and may take significantly longer an hour or more e Note the two dials on the left cover of the power supply If the plasma will not light power cycle the AED and watch the dial readings per step 4 above Released MAY 2000 G2350A AED Service Manual 186 Zone is not heating Electronics Troubleshooting Zone is not heating Problem Possible cause Suggested actions ne or more zones are not heating No zones are heating The PRT wiring is bad The heater wiring is bad The AC board relay is bad The main board control transistor is not develop ing the gate pulse AC board fuse F5 is blown Check the temperature reading on the ChemStation A bad PRT will give incorrect readings perhaps very low or very high as its lead wires are shorted If the zone is too cold and the reading agrees check the heater or the AC board See PRT resistance vs temperature on page 179 and Figure 132 AC board If the PRT reads below room temperature it is not working Replace the PRT heater assembly If there is power check the pinouts on the AC board to ver ify power is going to the heated zone If the zone has power replace the heater Alternately examine the wires for the heater and PRT If the insulation is frayed check the resis tance voltage of the PRT and heater See Figure 132 AC
95. d Black 3 Switch normally closed Black 4 Stepper motor Yellow 5 Stepper motor Orange 6 24 V stepper motor Red 7 Not used 8 24 V stepper motor Red 9 Stepper motor Brown Connector to gas flow system Pin Function 1 2 Not used 3 High flow solenoid 4 Solvent vent solenoid 5 Oxygen solenoid 6 Hydrogen solenoid 7 Auxiliary solenoid 8 Solvent vent solenoid 9 Oxygen solenoid 10 Hydrogen solenoid 11 Auxiliary solenoid 12 13 Not used 14 High flow solenoid Released MAY 2000 G2350A AED Service Manual 231 Cabling Diagrams and Pinouts Main harness cable assembly part no 62350 60680 Connector to main board P100 Pin Function Pin X Function Pin X Function 1 Stepper motor 13 Stepper motor 25 Slit motor blue lead 2 Spark sparker 14 24 V sparker 26 BX slit encoder 3 24V 15 24V 27 5 V slit encoder 4 Solvent dump 16 Aux reagent 28 5 V unassigned 5 Stepper motor 17 24 V stepper motor 29 Array motor red lead 6 5 V sparker 18 24 V stepper motor 30 AY array encoder 7 24V 19 24V 31 GND D array encoder 8 0 reagent 20 Unassigned 32 GND D unassigned 9 Stepper motor 21 Slit motor red lead 33 Array motor blue lead 10 GND D sparker 22 AX slit encoder 34 By array encoder 11 24V 23 GND D slit encoder 35 5 V array encoder 12 H reagent 24 Slit motor shield 36 Array motor shield Connector to emission source sense cable Pin Function 1 PRT safety circuit normall
96. damage See Table 23 on page 179 Replace the heater PRT assembly or heated core Verify the emission source assembly is attached to the enclosure and is fully against the switch Short the pins of the switch If the plasma lights replace the switch See Figure 139 G2350A internal cabling dia gram Check the resistance of pins 2 and 3 on the spectrometer If the pins read open the switch is faulty Replace the spectrometer Check that the cables are properly connected and that there is no con tamination on the pins Replace cables as required See Figure 139 G2350A internal cabling diagram Short the pins across the switch If the pump starts and the plasma re ignites replace the switch Replace the emission source Released MAY 2000 G2350A AED Service Manual 194 Gas Flow System Troubleshooting No pressure at the cavity pressure gauge No pressure at the cavity pressure gauge Problem Possible cause Suggested action There is no pressure at the cavity Gross leak the cavity Tighten the lens mount nut firmly until the lens mount liner pressure gauge and there is gas assembly lens mount cannot be moved by wiggling the spark plug available at the source assembly or gas drawer Remove the lens purge line from the cavity and plug with your finger If the helium pressure quickly rises there is a leak in the cavity assembly the exit lines the fly ash filter or the gauge If the pressure does not rise quickl
97. duces instrument performance and life e Check the water level daily at the reservoir in the AED e Add distilled water to the reservoir to maintain the level at just above the upper fitting If the water level drops too low the plasma will shut off e Keep the lid on the water reservoir This avoids burn hazards and prevents water loss through evaporation e Do not put rust prone objects in the reservoir as rust will contaminate the system Released MAY 2000 G2350A AED Service Manual 122 Warning Water Flow System Maintenance Pressure switch e Ifthe system is to be shut down for any length of time drain the water sys tem to prevent algae growth Pressure switch If your AED serial number is US01000166 To replace the pressure switch High Voltage To reduce risk of electric shock disconnect the power cord from the AED Do not operate the AED with the water drawer open High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Power down the AED 2 Remove power cord in the rear of the instrument 3 Remove the water drawer See Water drawer on page 133 4 Remove the water board panel and switch assembly from the drawer See Water board on page 130 Switctitolfiectors Water board Figure 89 Replacing pressure switch 5 Remove the switch connectors fro
98. e Released MAY 2000 G2350A AED Service Manual 159 Gas Flow System Theory of Operation Flow modes Basic operation Description Spectrometer lens purge flow He standard helium flow through the discharge tube plus any desired reagents e Solenoid s energized Any reagent H5 CH N e Total flow rate 80 mL min 5 mL min per reagent 02 Solenoid S1 off H2 Solenoid S2 off CH4 N2 Solenoid S3 off Solvent Vent Solenoid S4 off High Flow Solenoid 55 off 02 or 02 Helium H2 or H2 Helium He CH4 N2 or CH4 N2 helium Static or Exhaust Helium column flow fpr forward pressure regulator mfc manual flow controler bpr back pressure regulator m1 main manifold block m2 secondary manifold block gage 1 helium head pressure gage gage 2 cavity pressure gage ri to r17 pneumatic restrictors ferrule cavity vent vent Gas flow system Window purge Makeup gases gt Makeup Gases Column flow Makeup Gases Spectrometer window purge Gases All Gases Cavity flow detail Figure 118 Gas flow system in basic operation flow mode Released MAY 2000 G2350A AED Service Manual 160 Gas Flow System Theory of Operation Flow modes High flow Description An additional 120 mL min of helium increases the flow through the discharge tube to boost sensitivity and to prevent the GC gases from react ing with the discharge tube e Solenoid s energized High fl
99. e The cavity PRT fails or is disconnected The water drawer is pulled out from the AED with the cavity attached The emission source sense cable is disconnected The spectrometer grating motor travels too far The main harness cable is loose at the spectrometer Released MAY 2000 G2350A AED Service Manual 177 General Procedures Troubleshooting Plasma shut off circuits Refer to Figure 129 below for a general diagram of the shut off circuits Main board J252 P500 Line Magnetron H30 Cavity HTL H30 sense overheat sense 12 34 56 6 Magnetron A PRT HTL ILL PRT Cavity PRT Emission source safety switch PS Pressure switch Heater sensor FS Flow sensor relay _ able assembly if equipped Spectrometer Water drawer control cable assembly p u Figure 129 Plasma shutoff circuits and cabling Released MAY 2000 G2350A AED Service Manual 178 PRT resistance vs temperature General Procedures Troubleshooting PRT resistance vs temperature The main board will assume there is a temperature runaway problem and turn off the plasma if any PRT reads above 460 C or if a PRT significantly exceeds the temperature set point The resistance of the PRTs used varies with temper ature according to the following approximate equation R 100 ohms 0 36 x T Alternately look up the approximate resistance from Table 23 b
100. e Table 18 for a listing of spectral lines Released MAY 2000 G2350A AED Service Manual 145 Electronics Theory of Operation AED electronics Electronics AED electronics The AED electronics consist of four printed circuit boards PCB s the power supply and associated cables and wires The four boards are the AC board the main board the sparker board and the water board A fifth board the service display board is a diagnostic device sometimes used by the Agilent Customer Engineer Mainboard AC board Sparker board Figure 109 AED electronics Released MAY 2000 G2350A AED Service Manual 146 Electronics Theory of Operation AC board AC board Voltage selection switches Fuses Figure 110 AC board The AC board works in conjunction with the transformer to condition and supply power to all AED components Specifically the AC board e Transforms incoming AC voltage 100 V 120 V 220 230 V or 240 V into 40 V AC for the main board fused DC power supply and into 120 V AC for the heated zones using fused contactor K2 e Provides primary power to the 2340 V DC magnetron through fused con tactor K1 e Provides zero crossing line sense signals for AC heater control e Controls the magnetron temperature e Provides line voltage selection e Provides line filtering e Specific board elements are described below Figure 111 Board elements Released MAY 2000 G2350A AE
101. e and the gas union then remove the dis charge tube from the gas union See Figure 67 Figure 67 Removing the discharge tube Released MAY 2000 G2350A AED Service Manual 99 Caution Emission Source Maintenance Discharge tube Dry the cavity using clean compressed air Then clean the discharge tube through hole in the cavity using the small cleaning brush supplied by Agi lent Technologies in the ship kit Use clean compressed air to blow any particles of debris from the through hole Use clean compressed air to clean the gas union First blow air through the column side so that any particles are blown out the discharge tube seat Then blow air up from the gas union disconnect block through each of the three tubes to the gas union Blow air through this end first Blow air through inlets in underside of block Figure 68 Cleaning the gas union 9 10 If the discharge tube has broken clean the cavity fly ash filter and lens as described in Cleaning the cavity on page 87 Inspect the lens mount liner for deterioration If the central area of the lens mount liner is greatly discolored or if the lens mount cone is loose and cannot be tightened replace the lens mount liner Do not touch the clear portions of the discharge tube with bare fingers 11 12 Rinse the inside of the discharge tube with alcohol Dry with clean com pressed air Install the ferrule onto the discharge tube Install th
102. e end with the short taper to the right See Figure 69 below Released MAY 2000 G2350A AED Service Manual 100 Caution Emission Source Maintenance Discharge tube Figure 69 Ferrule orientation 13 14 Gently slide the discharge tube into the cavity until it protrudes approxi mately 1 cm past the O ring seat on the far side Gently rotate if necessary Place a new discharge tube O ring over the end of the tube on the optical side Avoid excessive pressure on the tube Slide the O ring a few millime ters down the tube To avoid breaking the discharge tube make sure the gas union is exactly per pendicular to the face of the cavity during installation 15 16 With the forefinger of your right hand hold the O ring in place while using your left hand to carefully slide the gas union over the discharge tube and into place in the heater block Hand tighten the gas union nut until the fer rule begins to grip the discharge tube The tube should slightly resist movement Do not fully tighten The tube should move if pushed gently Align the gas union to the cavity as shown in Figure 70 below Use a wrench to tighten the gas union nut 1 8th of a turn Do not fully tighten The tube should move if pushed gently Released MAY 2000 G2350A AED Service Manual 101 Emission Source Maintenance Discharge tube Align gas union with screw Figure 70 Gas union orientation 17 18 19
103. e measured flow rate drops below 375 mL min The light continues to flash even when the flow rate drops below 250 mL min and the pump stops G2350 60085 The water board regulates the discharge tube temperature while the AED is on and controls the AED cooling fan It monitors a water flow sensor and contains a pressure sensor to confirm coolant flow The board then varies the water pump speed accordingly The pressure switch is connected in series to connec tor J252 on the main board If the switch opens the main board stops the 24 V power to the water board and the power to the magnetron to prevent plasma ignition The main board notifies the user of the potential problem The water drawer cooling fan runs at a constant rate while the AED is ON Power supply The high voltage power supply delivers both the filament current of 8 A at 2 V and the magnetron current of 60 mA at 2340 V The power supply has two con nectors one running to the AC board and the other to the magnetron It is attached to the AC board by four wires hot neutral ground and high voltage enable When the AED is first powered on AC voltage runs to the auto sensing power supply at standard house voltage Power is immediately supplied to the main board When settling time has passed the main board enables the contac tor to close the circuit to the power supply starting the low voltage power flow to the filament The low power meter on the power supply should read abou
104. e water pump in a Type 1 water drawer 126 Installing the water pump in a Type 2 water drawer 128 Installing the water pump in a Type water drawer 129 Complete the installation eeeesseseeeeeeeeeeeene enne 130 Water Oar de oer eee aE rhet eR HER RR TRE RR ETE ER da cations 130 Released MAY 2000 G2350A AED Service Manual Contents Water draw Gr s iet etre telae cs tee Du een neice 133 Water Biter E 135 SENSOR bus elt eet 138 Chapter3 Theory of Operation Overview Optical Assembly Spectromieler zoe et e tote m RR 144 PDA qe 145 Electronics AED el ctronics uite tere eet te ee desee teet tects 146 AQ DoArd 5 et ente d aere edt 147 Input voltages listed by 148 Voltage selection settings nn nenen a a N ras 148 Heated ZONES ee TE EE tne tanto bct bein eie iis 148 Opto 1SsolatOE x ie 149 Magnetron temperature control circuit 149 CONTACTOTS 4 oen Sentent ette rette Re DEN 149 High voltage enable ect ttr tm ere eae dade eet pedet 149 Main E AE 150 Power supply rea eee tiet eee eene sta he eu epa 151 Processor CPU RAM and ROM eese 151 VO control GPIB communications control sess 151 Motor c
105. e wear and a dust respirator until the insulation is either sealed or replaced High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Use two wrenches to loosen the column nut then remove the column from the transfer line Ferrule gt nut Figure 78 Removing column from transfer line Released MAY 2000 G2350A AED Service Manual 112 Gas Flow System Maintenance Column installation changing columns 2 Ifthe column appears damaged at the end resulting in broken column pieces in the cavity clean the cavity as described in Cleaning the cavity on page 87 3 Disconnect the column from the GC inlet and remove it from the GC oven in accordance with the 6590 GC Service Manual 4 Slidea column nut and graphite ferrule over one end of the new column and install in the injector Slide a column nut and graphite ferrule over the other column end Insert the column into the fitting end of the column sizing tool and slide it through until it protrudes from the open end of the tool Note that the ver sion of this tool shown below is equivalent to the newer version delivered in the skip kit ferrule column nut EA trimming tool mensi Figure 79 Column installed in tool column nut side Column Figure 80 Column installed i
106. el to a fume hood The effluent gases may contain ozone or other harmful gases produced by the plasma Oxygen hydrogen and methane present an explosion hazard Vent the gases to a fume hood Ideally each gas should be vented to a separate hood Hydrogen gas To reduce risk of explosion fire and injury ensure that hydrogen gas is only connected to the gas inlet on the side panel labeled HYDROGEN Hydrogen gas presents an explosion hazard Vent hydrogen gas to a fume hood Ensure that hydrogen is plumbed only to the hydrogen inlet Insulation If the insulation is flaky crumbly replace or seal the insulation Wear protec tive clothing eye wear and a dust respirator until the insulation is either sealed or replaced The AED end of the heated transfer line is insulated with a material consisting of lime silica and reinforcing fibers that can cause irritation to the skin eyes and mucous membranes Wear gloves when touching the bare insulation Replace any part with exposed insulation Released MAY 2000 G2350A AED Service Manual 60 Optical Assembly Maintenance Replaceable components Optical Assembly The PDA and preamp board the spectrometer and the PDA ribbon cable are designed to be easily replaceable as units Therefore no maintenance is per formed on these units If a problem is detected within the Spectrometer cable PDA or the PDA preamp the assembly is replaced Replaceable components PDA assemb
107. elow Table 23 Approximate PRT Resistance ohms vs Temperature C c 0 100 200 300 400 0 100 00 138 50 175 84 212 03 247 06 10 103 90 142 28 179 51 215 58 250 50 20 107 79 146 06 183 17 219 13 253 34 30 111 67 149 82 186 82 222 66 257 34 40 115 54 153 57 190 46 226 18 260 75 50 119 40 157 32 194 08 229 69 264 14 60 123 24 161 04 197 70 233 19 267 52 70 127 07 164 76 201 30 236 67 270 89 80 130 89 168 47 204 88 240 15 274 25 90 134 70 172 16 208 46 243 61 277 60 Released MAY 2000 G2350A AED Service Manual 179 Warning General Procedures Troubleshooting Testing for microwave leakage Testing for microwave leakage A Holaday Microwave Survey Meter Model 1510A is required Before turning on the AED visually examine the waveguide waveguide transformer magnetron and all other parts of the emission source assembly to make sure there are no gross defects such as any cracks gaps or obvious damage Waveguide Waveguide transformer A Magnetron j D n AC Figure 130 Emission source assembly To test for microwave leakage 1 Turn off the AED 2 Verify that the microwave survey meter is functioning e Check the battery Turn the function switch to BATT TEST and confirm that the needle indicates BATTERY OK e Test the leak detector probe Turn the selection switch to PROBE TEST The display should read OK PROBE TEST e Turn the function switch to the most sensitive scale 2 mW
108. em cannot be isolated or resolved using the actions described contact Agilent Service Per sonnel In general before working on a gas flow problem reset the flow rates to standard whenever possible By setting the flow back to standard trouble shooting flow rates and leak rates becomes easier Because the spectrometer is highly sensitive to moisture and contamina tion check the following before performing detailed diagnostics on the optical assemblies a The spectrometer lens Replace it as required b The nitrogen used to purge the spectrometer The purge gas must be sufficiently clean 99 9996 pure To access the water board more easily loosen the two screws holding it to its palette and let the board incline at an angle Released MAY 2000 G2350A AED Service Manual 176 General Procedures Troubleshooting Plasma shut off circuits Plasma shut off circuits At start up and during operation the AED main board and the AC board check the voltages of certain inputs to verify it is safe for plasma ignition If any part is not operating correctly or if one of the monitored circuits is open then the main board will not enable the magnetron power will cut off power to the heated zones and prevent plasma ignition These circuits are listed in Table 22 below Table 22 AED Plasma Shutoff Circuits Measured Circuit Acceptable condition input Power cut Cavity temperature See 1 below See 1 below High voltage
109. en on to continue to purge air out of the system Open the GC oven 6 Use two wrenches to loosen the column nut inside the GC Slide the nut away from the fitting 7 Pull the column back a minimum of 45 mm into the GC Released MAY 2000 G2350A AED Service Manual 91 Warning Caution Emission Source Maintenance Moving the cavity assembly to the service position 8 Lowerthe front face and open the front lid Do not cut or abrade insulated surfaces If the insulation is flaky crumbly replace or seal the insulation Wear protective clothing eye wear and a dust respirator until the insulation is either sealed or replaced 9 Using a2 5 mm hex key loosen the set screw in the top of the insulation tube over the cavity until the insulation tube moves freely Do not remove the screw It is not easy to reinstall wy A2 Loosen set screw Figure 58 Loosening the insulation tube set screw Be careful not to move the AED or GC You must keep the sides of the AED and GC parallel to each other so that the transfer line and gas union mate properly 10 Carefully push the insulation tube off the heater block and into the GC oven until the gas union and heated core are exposed If necessary gently wiggle or twist the tube until it moves easily 11 Using two 5 16 inch wrenches loosen the Swagelok nut that holds the heated core onto the gas union Push the heated core into the insulation until clear of the gas union
110. er ON OFF switch Front facing Gas drawer Figure 26 Front view of the G2350A AED G2350A AED control The G2350 Atomic Emission Detector is controlled through the GC AED Chem Station computer software Only the main power and certain gas pressures are manually controlled Creating and running methods To learn how to run methods and sequences to analyze samples refer to the extensive online help files available in the GC AED ChemStation and the Understanding Your ChemStation manual ON OFF switch The ON OFF switch is located in the front of the AED in lower left corner View window On the front of the AED in the upper left corner is a tinted view window which allows you to look into the cavity while the AED is running During operation a bright glow from the plasma should be seen Released MAY 2000 G2350A AED Service Manual 39 Installation Important operating tips Adjusting gas flows The makeup gas flow is controlled using two flow controllers located on the gas drawer front panel Other gas flows are set from the ChemStation or fixed at the factory Adjusting the water flow The water coolant flow rate is set automatically by the G2350A Checking the water level The water level can be checked by lowering the front face of the AED A slit in the water drawer shows the water level in the reservoir Check the water level daily when the AED is in use Order of GC AED system start up In most cases start
111. escribed below The flow rates given are measurable at the cavity purge outlet when e ferrule vent is closed e The cavity pressure is set at 1 5 psi e The cylinder head pressures are set according to the procedures listed under Connecting gas piping on page 30 Note that the spectrometer lens purge is fixed at 25 mL min and the sample flow from the GC is not included in the total Released MAY 2000 G2350A AED Service Manual 158 Gas Flow System Theory of Operation Flow modes Standby Description Spectrometer lens purge flow He standard helium flow through the discharge tube oxygen flow turned on e Solenoid s energized e Total flow rate 85 mL min 02 Solenoid S1 ON 8S 02 or 02 Helium H2 Solenoid 52 off E H2 or H2 Helium He CH4 N2 Solenoid S3 off E CH4 N2 or CH4 N2 helium Solvent Vent Solenoid S4 off Static or Exhaust High Flow Solenoid 55 off E Helium CH N column flow fpr forward pressure regulator mfc manual flow controler bpr back pressure regulator m1 main manifold block ferrule cavity m2 secondary manifold block vent vent gage 1 helium head pressure gage gage 2 cavity pressure gage r1 to r17 pneumatic restrictors Gas flow system Window purge Makeup gases rz Makeup Gases Column flow Makeup Gases Spectrometer window purge Gases All Gases Cavity flow detail Figure 117 flow system in standby mod
112. ese 28 Connecting gas piping 30 Installing your transfer line 33 Water filling o ertet te ret mer 37 Basic operation of your AED esee 39 Important operating tips eene rennen 40 First Start Up 41 Verifying 47 Specifications Released MAY 2000 G2350A AED Service Manual Installation Introduction Introduction This Installation section repeats information included in the Setting Up and Maintaining the Agilent G2350A AED manual included in the shipping box with your G2350A Atomic Emission Detector It also describes how to prepare your Atomic Emission Detector AED for use and how to test the instrument to make sure that it is functioning properly Installing your Atomic Emission Detector AED Your G2350A AED is designed to operate in conjunction with a Gas Chromato graph GC and a computer running Microsoft Windows NT 4 0 and the G2070AA ChemStation application with the G2360AA GC AED software option If these systems are not installed yet refer to each system s instruc tions to install and learn how to operate them properly First set up your Gas Chromatograph then your computer and ChemStation application before installing your AED To unpack install and learn how to operate you
113. et the source pressures to the levels listed in the Customer Information Sheet provided with your AED If the data is not available set the pressures to the approximate val ues given below Table 10 Gas Pressures and Purities Flow Rate mL min Supply Pressure Gas Purity Approx Consumption psi Helium 99 9999 200 80 100 Hydrogen 99 997 20 60 Oxygen 99 997 20 60 Auxiliary Gas 10 1 CH4 90 99 99 20 60 Methane 99 99 20 70 90 Nitrogen 99 99 400 40 Required for the performance verification procedure The purity requirement is on component gases of the mixture It is important to set the source pressures properly The AED uses fixed restric tors to regulate the flow rates of the gases Information is provided with the AED with the reagent gas pressure settings that provide optimum performance Set the gas cylinder regulators to this pressure Released MAY 2000 G2350A AED Service Manual 31 Installation Connecting gas piping Figure 14 Properly connected gas lines For GCs with EPC option 308 1 Replace the frits in the EPC auxiliary manifold with FID air restrictors part no 19231 60610 These frits are required for proper flow of gases in the AED Use the Viton O rings part no 5180 4182 12pk provided in the EPC manifold ship kit 2 Connect the three reagent gas lines to the auxiliary manifold of the GC EPC as shown below See Figure 15 Aux 3 Aux4 Ho Aux5 or CH4 Peal
114. etes te E erede Chee aes Installing your Atomic Emission Detector AED Preparing your work station neret neret enne GAS SOUECOS Suppliers of helium getters and nitrogen generators Preparing your gas SOULCES eene nennen nennen Gas system considerations eese enne Gas system set up sssssssseseseeeeeeeen nennen nennen nn sn tenete trente nnne Installing your ChemStation software essent Uncrating your AED ete ek ne aene te e 5 m reet tee rne eere eer eicere nda erede Uncratng e eet ear ate RO REOR ERRARE bg Mises Contents o Seo tette ai het este ens Connecting control cables eese eene enne nhen tentes GPIB cable teet eee a Remote start cable i RI eerte tenente ea ee e EL bartenders GC injector tray and controller if present Connecting gas piping Connecting the nitrogen purge esses trennen Connecting other gas lines Installing your transfer line ehe Rep Basic operation of your AED 114 eese G2350A AED e des t td re a ede de ts Creating and running
115. ethod Save Method Overwrite the earlier version Load method CKO RUN2 M Select Method Load Method CKO_RUN2 M Modify the default settings listed in the method for the oxygen hydrogen auxiliary gas and or column inlet pressures as needed to match the print out of method CKO_TIME M See step 12 above Save the new settings Released MAY 2000 G2350A AED Service Manual 48 15 16 1T 18 19 Installation Verifying performance Select Method Save Method Overwrite the earlier version Load sequence CKO TST S Select Sequence Load Sequence CKO TST S Run sequence CKO TST S Select Run Control Run Sequence The sequence takes about 1 hour to run When finished a report is printed which shows the detection limit noise selectivity and back amount for each of the test elements See the sample data and sample chromatograms below Compare the printed Psel values to the selectivity limits of the specifica tion and compare the printed MDL values to the MDL specification If the results are acceptable the unit is ready for use If the results are unaccept able adjust the reagent flow rate s troubleshoot the unit and retest see step 16 until the AED output is within specification At the end of the sequence you will be asked if you want to save the mea sured back amounts for the tested elements e If the test results look acceptable click OK to save the Back Amount if desired e Ifthe test resu
116. fer line 253 Lens mount assembly 254 Sparker assembly sese eene eee 255 Spectrometer assembly sess 256 Water drawer AED serial gt 1000166 257 Water drawer AED serial lt 1000166 261 Released MAY 2000 G2350A AED Service Manual 244 Replacement Parts Introduction Introduction This chapter lists the part numbers for all replaceable parts Please note not all parts in the list are user replaceable In addition some parts are replaceable only as part of larger assemblies To replace one of these parts order the assembly Gas drawer changes Beginning with AED serial number 3000208 all gas drawers use an externally accessible filter Aside from the filter mounting hardware the earlier gas draw ers are identical to the newer version Water drawer change Beginning with AED serial number 1000166 the water drawer uses different flow monitoring electronics If desired you may upgrade the water drawer to the current configuration See Water drawer AED serial no 1000166 on page 261 Released MAY 2000 G2350A AED Service Manual 245 Electrical components Figure 156 Electrical components Replacement Parts Electrical components Number Description Part number Oty Assy 1 Main board assembly G2350
117. for possible future firmware upgrades These ROMs are U102 U207 and U208 Replace a ROM as described below Warning High Voltage To reduce risk of electric shock disconnect the power cord from the AED Caution The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics 1 Turn off the AED 2 Open the cover 3 Using a chip remover firmly but gently grab the ROM and pull it straight out from its socket 4 Install the new chip Released MAY 2000 G2350A AED Service Manual 80 Warning Warning Electronics Maintenance Sparker board Sparker board Figure 51 Sparker assembly Sparker assembly Replace the entire sparker assembly PCB coil and module as described below High Voltage To reduce risk of electric shock disconnect the power cord from the AED High Voltage To reduce risk of electric shock the ground strap for the magne tron power supply must always be connected to the wave guide when the AED is in operation 1 Turn off the AED and unplug the power cord 2 Remove the connector at J1 3 Remove the spark plug wire at the spark plug 4 Remove the mounting screw that secures the sparker assembly to the AED enclosure using a posi drive Released MAY 2000 G2350A AED Service Manual
118. g Caution Caution Emission Source Maintenance Cleaning the cavity Wear safety glasses when performing this procedure Ultraviolet Light To reduce risk of eye damage never operate the G2350A without the glass filter in the view port of the cavity Never view the plasma by looking directly into the open end of the discharge tube while the plasma is lit 1 2 Move the cavity into the service position If you haven t already done so remove the white exit chamber and gas union from the cavity See Discharge tube on page 98 Remove the water lines from the cavity by pulling them off the fittings You do not have to remove the hose clamps to do this Do not spill the water from the lines onto the water drawer electronics Run the large brush through the cavity water fittings to remove any debris While supporting the GC and optical side water chambers remove the three screws that secure the chambers to the cavity assembly Remove the cavity heater PRT assembly to avoid straining the wires Lift the GC side water chamber from the cavity assembly Do not use solvents to clean the O rings Residual solvents may contaminate your test results or degrade O ring life T Use clean compressed air to blow any water off of the conical surface on the water chamber Carefully remove the O ring from its seat Inspect for glass particles and clean any particles from the chamber using clean com pressed air If necessary use a Kim
119. gas is turned on Check if hydrogen is turned on white After changing the discharge tube Wait approximately 20 minutes If the problem per there is residual water in the tube sists investigate the other possible causes below Discharge tube is cracked water leak Inspect the discharge tube and replace if necessary Discharge tube O ring is missing or Replace the O ring damaged water leak Ss High flow TS Hydrogen Erie Figure 136 Solenoid locations Released MAY 2000 G2350A AED Service Manual 196 Gas Flow System Troubleshooting Solenoid will not operate Problem Possible cause Suggested action Reagent gas or high flow will not Solenoid operate the gas sources are work ing Clogged or blocked line after the sole noid Set the ChemStation to monitor the appropriate line for the solenoid 174 C 193 486 or 0 777 Toggle the solenoid ON and OFF and check for a significant change in the area counts See also First start up on page 41 for information on the proper area counts for each element Solenoid Monitor element line Hydrogen H 486 Oxygen 0 777 Auxiliary C 193 Makeup High N 174 Solvent vent any of the above Turn valve on off and check for a 24 V reading at the solenoid input If there is no signal check the wiring and the main board If there is a signal but the solenoid does not switch replace it Set the flow rates to standard see First sta
120. ge 124 Released MAY 2000 G2350A AED Service Manual 138 Warning Caution Water Flow System Maintenance Flow sensor Water flow sensor Mounting screws Sensor clamps Loosened pump Figure 105 Replacing the flow sensor 6 Remove the connector from the sensor Remove the two hoses clamps and hose barbs from the sensor 8 Remove the two mounting screws from the sensor 9 Replace 10 Install in reverse order Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED Do not operate the AED with the water drawer open 11 Turn on the AED 12 Observe the water flow making sure there are no leaks Correct any leaks If there is a water leak quickly shut off the AED to avoid spilling water within the enclosure 13 Refill the reservoir with distilled water to just above the upper fitting The new flow sensor switch may require adjustment To adjust the new flow sensor turn the adjusting screw fully clockwise then back it off until the flow LED goes off Turning the screw clockwise decreases the flow rate and turn ing it counterclockwise increases the flow rate Released MAY 2000 G2350A AED Service Ma
121. gh flow solenoid is normally off with flow blocked but in high flow mode it directs 120 mL min of helium into the main manifold to augment the makeup flow for a total flow rate between 150 mL min and 300 mL min The solvent vent solenoid 1 closes the exhaust path for gases exiting the dis charge tube This forces the window purge to back flow through the discharge tube preventing the makeup and column flows from entering Instead they are routed to bypass through the solvent vent solenoid and out to vent Released MAY 2000 G2350A AED Service Manual 171 Water Flow System Theory of Operation Water drawers without a flow sensor Water drawers without a flow sensor Some G2350A water drawers use only a pressure sensor to monitor flow If your water drawer looks like Figure 127 it is described below Figure 127 Water drawer with pressure sensor only The water flow system pumps distilled water over the discharge tube to main tain a safe operating temperature in the tube The system is controlled by the water board A 9 to 21 V DC variable speed pump with a magnetically coupled head circulates 370 to 430 mL minute of water through the instrument for cool ing If the water pressure drops too low the high voltage to the magnetron is stopped and plasma ignition is prevented The water passes through a 5 micron 70 mL capacity filter to clean any particles which have generated or degenerated from the gear pump head Released MAY
122. he MFC and nitrogen lines are swapped Solvent vent solenoid plumbing incor rect Solvent vent solenoid valve defective There is a leak in the cavity or in the cavity fittings There is a leak in the back pressure regulator fittings or in the back pres sure regulator There is a leak in the 0 10 psi gauge Replace the gas drawer Replace the gas drawer Replace the gas drawer Replace the gas drawer Check the Out and the In lines to the MFC Reconnect them if they are not correctly installed Replace the gas drawer Check the plumbing to the sol vent vent solenoid valve Replace the valve See Finding gas leaks on page 192 Isolate the source of the leak See Finding gas leaks on page 192 If the fittings are leaking tighten them If the leak persists or if the back pressure regulator is leaking replace the back pressure regulator Isolate the source of the leak See Finding gas leaks on page 192 If the gauge is leak ing try tightening the fittings first If the leak persists replace the gauge Released MAY 2000 G2350A AED Service Manual 199 Spectrometer and Chromatography Troubleshooting Chromatographic peaks not sharp Spectrometer and Chromatography Chromatographic peaks not sharp Problem Possible cause Suggested actions Chromatographic peaks are Contamination in the GC not sharp Chromatography tech niques AED and or GC gas flows are inappropriate Con
123. he assembly by the pump head 2 Remove the pump connector from the water board then remove the hoses clamps and hose barbs from the old pump Unfasten the clamp around the pump and remove the old pump Remove the mounting bracket from the new pump by removing the four screws that hold it onto the coupling Reinstall the mounting screws into the coupling Remove screws ee Figure 93 Removing the mounting bracket Released MAY 2000 G2350A AED Service Manual 127 Caution 5 Water Flow System Maintenance Water Pump Install the new pump into the hose clamp and reconnect all fittings Installing the water pump in a Type 2 water drawer For this type of installation you will rearrange the mounting bracket on the new pump and use it to install the pump onto the side of the water drawer When removing the fittings from the pump head hold the assembly by the pump head 1 Remove the pump connector from the water board then remove the hoses clamps and hose barbs from the old pump 2 Remove the old pump 3 Remove the mounting bracket from the coupling by removing the four mounting screws See Figure 94 Remove screws Pump head Remove screws Figure 94 Remove the mounting bracket and loosen the coupling 4 Remove the remaining screw securing the coupling to the pump motor See Figure 94 The coupling and pump head will now rotate on the pump motor Magnetic attract
124. he gas drawer Purge gases flow over the spectrometer lens and the spectrometer to keeping them clean and dry The purge gases are then vented CH N or CH column flow ferrule cavity vent vent Figure 116 Gas flow system Released MAY 2000 G2350A AED Service Manual 157 Gas Flow System Theory of Operation Flow modes The AED uses the following gases Table 21 Gases Used in AED Gas Use Helium Added to the sample gas flow from the column to achieve a sufficient flow through the AED cavity Makes the plasma Spectrometer lens purge Nitrogen Spectrometer purge only Oxygen A reagent gas Increases sensitivity to certain elements Hydrogen A reagent gas Increases sensitivity to certain elements CH IN A reagent gas Increases sensitivity to certain elements Methane A reagent gas Increases sensitivity to certain elements Flow modes By varying the composition of the gas mixture and the overall amount of gas the AED operates in one of five primary and three secondary flow modes These flow modes are e Standby e Basic operation e High flow e Solvent vent e Calibration e Reagent gas The mode in use depends on the current analysis being run or the operational state of the instrument The flow modes are created when the main board ener gizes different combinations of the five solenoid valves controlling the gas flows through the manifolds tubing restrictors and cavity The flow modes are d
125. hreads and mounting surfaces with clean air spray Released MAY 2000 G2350A AED Service Manual 64 Optical Assembly Maintenance Spectrometer 12 Cover the opening 13 Remove the lens mount liner assembly O ring lens mount cone and lens mount liner from the lens mount top Be careful not to lose the three O rings in the lens mount liner See Figure 39 Figure 39 Lens mount liner removed 14 Remove the three screws in the lens keeper and remove the lens keeper assembly See Figure 40 Lens mount nut Figure 40 Lens keeper assembly removed 15 Remove the lens mount top and lens mount nut Cover to keep clean 16 Inspect the lens Replace or clean as required See Spectrometer lens on page 67 17 Unscrew the 2 screws in the lens mount bottom and remove Clean the threads and mounting surfaces with clean air spray See Figure 41 Released MAY 2000 G2350A AED Service Manual 65 Optical Assembly Maintenance Spectrometer Figure 41 Lens mount bottom removed 18 19 20 21 22 23 24 25 26 27 28 29 30 Install plastic slit cover and tape cover in place Remove the four mounting screws and remove the spectrometer from the cradle Set the cradle aside Place new spectrometer upright with the PDA window and slit facing up Remove the tape and cover from the new spectrometer Install the lens mount bottom The screw near the small through hole should be at the
126. ide water chambers in place then install the topmost screw to hold them together Install the other two screws Alternately tighten each screw until snug 15 Inspect the fly ash filter for water contamination If there is water in the filter you will need to inspect the spectrometer lens for contamination Clean any water or debris from the lens as described in Spectrometer lens on page 67 Blowing air through the lower fitting on the fly ash filter will damage the cavity pressure gauge Allow water below the filter to dry out through normal use 16 Ifthere is water in the fly ash filter remove the filter as described in Fly ash filter on page 116 Leave it disconnected for now Connect clean com pressed air to the lens purge tubing at the lens mount liner fitting and blow any water through the tubing and out of the upper fly ash filter fitting 17 Replace the fly ash filter and reassemble 18 Inspect the lens mount liner for deterioration If the central area of the lens mount liner is greatly discolored or if the lens mount cone is loose and cannot be tightened replace the lens mount liner 19 Reinstall the spectrometer lens lens purge lines sparker and sparker wire and lens mount liner as described in Spectrometer lens on page 67 20 Reconnect the water tubes to the cavity fittings Fittings Tube no Flow direction e Left side 1 Flow out from cavity e Right side 2 Flow in to cavity Before re starting the AED make su
127. in the GC Element line Expected value N 174 130 C 193 520 H 486 520 0 170 104 If the leak is in the GC 1 Check the liner and verify that the liner seal is not graphite Graphite line seals can leak Make sure the septum is not leaking Inspect the flow controller tubing Adjust the M8 fittings to determine if they change the nitrogen line Spray an aerosol duster at the fittings while inspecting the carbon line If there is a leak the carbon in the Freon will increase the carbon line If the leak is not in the GC 1 Perform a gross leak test by placing your thumbs over the ferrule purge and the cavity vents This should cause the cavity pressure gauge to rap idly rise in value If the gauge rises slowly and does not reach 5 psi then there is a leak in the AED Monitor the background as you turn reagent gases ON and OFF If it moves up and down check the reagent gas system for leaks Increase the makeup gas flow and monitor the nitrogen 174 line If it decreases there is a leak in the AED Remove the lens purge line from the cavity and plug with your finger If the helium pressure quickly rises the problem is in the cavity assembly the exit lines the fly ash filter or the gauge If the pressure does not rise quickly the problem is in the gas drawer Use a leak hunter to leak check fittings at tanks unions etc Butane may take two or three minutes to show up on the carbon line Leak check a
128. in the sections listed below Table 16 Parts Assemblies for Replacement Topic See Exit Chamber Discharge tube on page 98 Optical Side Water Chamber Cleaning the cavity on page 87 GC Side Water Chamher Cleaning the cavity on page 87 Gas Union Discharge tube on page 98 Released MAY 2000 G2350A AED Service Manual 94 Warning Warning Emission Source Maintenance Cavity heater PRT assembly Cavity heater PRT assembly Cavity heater PRT assembly Figure 62 Cavity heater PRT assembly To replace the cavity heater PRT assembly High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Using the ChemStation software turn off the plasma and disable the heated zones in the AED 2 Allow the cavity and heated transfer line to cool down to 35 C or less High Voltage To reduce risk of electric shock disconnect the power cord from the AED 3 Turn off the AED and remove the power cord 4 Open the front lid Released MAY 2000 G2350A AED Service Manual 95 Emission Source Maintenance Cavity heater PRT assembly Figure 63 Disassembly Warning Microwaves Never remove the screws attaching the cavity to the waveguide or the screws which fasten the cavity halves together Never operate the G2350A AED when the cavity magnetron or waveguide are disassem
129. inch and a 7 16 inch wrench to remove the spectrometer purge line from the spectrometer Plug the spectrometer s inlet Disconnect the three stainless steel lines to the gas drawer Disconnect the two teflon purge lines from the gas drawer If needed the drawer frame can be disassembled into two parts although the gas lines will still hold the halves together To disassemble the drawer remove the seven mounting screws which hold the drawer halves together Five screws are located on the bottom of the drawer and two are along the side This will allow more working room within the drawer Be careful not to stretch the gas lines too far Released MAY 2000 G2350A AED Service Manual 110 Warning Warning Gas Flow System Maintenance Changing gas cylinders To long lead from gas union To middle lead from gaz union To outer lead from gaS union P To lens purge inlet Spectrometer purge Figure 77 Pneumatic connections Changing gas cylinders Gas purity is most likely compromised when gas cylinders are being changed Follow the procedure below for changing the gas cylinder to ensure gas purity Hydrogen Gas To reduce risk of explosion fire and injury ensure that hydro gen gas is only connected to the gas inlet on the side panel labeled HYDROGEN Hydrogen Gas To reduce risk of explosion fire and injury ensure that the hydrogen gas flow is turned off at the source and in the AED before s
130. install the spectrometer purge the cavity vent the lens purge and the spectrometer cable 34 Reinstall the transfer line and column 35 When complete the pressure gauge on the panel should read 1 5 psi for the spectrometer lens purge If it does not there is a leak at one of the gas ports at the spark plug or at the O ring seal Tighten the spark plug gas lines or the lens mount nut as required See also Spectrometer on page 144 Spectrometer assembly To replace the spectrometer assembly spectrometer cradle assembly PDA and lens mount assembly High Voltage To reduce risk of electric shock disconnect the power cord from the AED 1 Turn off the AED Disconnect the PDA to Main PCB cable from the main board 3 Remove the spectrometer assembly from the AED as described in Spec trometer on page 63 4 Replace the spectrometer assembly Spectrometer lens It is most convenient to replace or clean the lens when the discharge tube is being replaced Note While a dirty lens can be cleaned it is recommended that a dirty lens always be replaced Released MAY 2000 G2350A AED Service Manual 67 Warning Optical Assembly Maintenance Spectrometer lens Removing the lens To remove the lens follow the procedure described below 1 Shutdown the AED 2 Move the cavity to the service position 3 Remove the spark plug wire spectrometer lens purge inlet and cavity vent lines from the lens mount liner
131. ion 1 Tee union To interlock on main board Pressure sensor Water board exchange e r e Water board mue Control circuit IS volt DC from water control board Filter Restrictor e Interlock Figure 169 Water flow path diagram version 2 Released MAY 2000 G2350A AED Service Manual 260 Replacement Parts Water drawer AED serial no lt 1000166 Water drawer AED serial no lt 1000166 5 1 6 2 7 3 4 8 Figure 170 Water drawer for AED serial no 1000166 Released MAY 2000 G2350A AED Service Manual 261 Replacement Parts Water drawer AED serial no lt 1000166 See Figure 170 for an illustration of the water drawer Number Description Part number Oty Assy Water drawer G2350 61250 1 Modified water board assembly 62350 60080 N A 2 Water pump assembly 62350 61445 1 3 1 8 IDx1 8 in wall neoprene tubing 0890 1745 N A 4 Tubing per cured Si rubber 0890 1831 N A 5 Switch pressure 115226 N A Nuts Washers 6 RP reservoir assembly 62350 60710 1 Reservoir clips 2 7 0 5 um water filter element 62350 80300 1 8 Flow sensor 0960 0877 Elbow mounting screws Washers NS Water drawer control cable assy 62350 60750 N A To upgrade your water drawer order the following parts Description Part number Oty Tee fitting 0100 1685 1 Water control board
132. ion helps keep the parts together Holding the pump motor steady rotate the pump head approximately 30 counterclockwise See Figure 95 Install the mounting bracket directly across from the pump IN and OUT connections Released MAY 2000 G2350A AED Service Manual 128 Water Flow System Maintenance Water Pump Align hole to secure coupling to pump body Pump IN and OUT connections Figure 95 Caution Align holes for mounting bracket Before After rotating the pump head Pump IN and OUT connections Pump head After installing the bracket Installing the bracket on the pump motor 7 Install the remaining screw 8 Install the pump onto the side of the water drawer and reconnect all fit tings and tubing Installing the water pump in a Type 3 water drawer 1 Remove the pump connector from the water board When removing the fittings from the pump head hold the assembly by the pump head 2 Remove the hoses clamps and hose barbs from the old pump then remove it from the bottom of the water drawer Released MAY 2000 G2350A AED Service Manual 129 Warning Warning Caution Water Flow System Maintenance Water board Complete the installation Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing
133. ittings Use only graphite or vespel ferrules Fly ash filter The fly ash filter is in the blue green plastic cylinder located in the gas drawer and is visible from the front of the AED The filter keeps dirt from getting into the back pressure regulator Replace the fly ash filter or filter tube as follows If your AED serial number is gt US 03000208 Effluent Gases To reduce risk of breathing ozone and other harmful gases pro duced by the plasma turn off all reagent gas flows and the column flow before starting this procedure Turn off the AED Released MAY 2000 G2350A AED Service Manual 116 Gas Flow System Maintenance Fly ash filter 2 Using the pliers supplied by Agilent Technologies in your ship kit care fully press the gray capture ring on the upper fitting inward while pulling outward on the filter tube fitting Avoid scratching the connecting tube Loosen the lower fitting in the same manner Repeat for each fitting until the filter tube and fittings are released from the front panel of the gas drawer See Figure 83 below Gray capture rings Fly ash filter tube Cavity pressure gauge Figure 83 Replacing the fly ash filter 3 Remove an elbow fitting from the filter housing 4 Replace the filter be sure to install the new filter so that the arrow points UP against the direction of the flow Reassemble When the gas flows are resumed the cavity pressure gage reading should be the
134. losed de energized position which puts the AED into the basic run flow mode The five solenoids are e High flow helium s5 e Auxiliary s3 e Oxygen sl e Hydrogen s2 e Solvent vent s4 Released MAY 2000 G2350A AED Service Manual 167 Gas Flow System Theory of Operation Solenoids He 05 H3 CH N column flow ferrule cavity vent vent Figure 123 Solenoids in de energized state High flow Hydrogen Auxiliary Solvent vent Figure 124 Solenoid locations Released MAY 2000 G2350A AED Service Manual 168 Gas Flow System Theory of Operation Solenoids The reagent and auxiliary gas solenoids direct flow into either manifold 1 or a bypass outlet on the side of the gas drawer depending on whether each reagent gas is required Released MAY 2000 G2350A AED Service Manual 169 Water Flow System Theory of Operation Water drawers using a flow sensor Water Flow System Water drawers using a flow sensor Some G2350A water drawers use a flow sensor If your water drawer looks like Figure 125 it is described below Flow sensor Relay on back of water board panel Figure 125 Water drawer with flow sensor The water flow system pumps distilled water over the discharge tube to main tain a safe operating temperature in the tube The system is controlled by the water board A 9 to 21 V DC variable speed pump with a magnetically coupled head circulates 370 to 430 mL minute through
135. lts were unacceptable click Cancel If any changes were made to the EPC settings or the column inlet pressure after running the CKO_TST S sequence modify the three methods TIME M CKO_RUN1 M CKO_RUN2 M and save the changes Print each method for future reference The new settings can be used as a start ing point for any new methods which are created Specifications The AED results must meet the specifications listed in Specifications on page 50 Released MAY 2000 G2350A AED Service Manual 49 Specifications Installation Specifications Figure 27 G2350A AED When set up and tested as described in First start up on page 41 and in Verify ing performance on page 47 the G2350A AED performance must meet the specifications listed below Table 12 Performance Specifications Emission Line MDL pg sec Selectivity over Carbon C193 1 CI 479 30 3000 H 486 4 N 174 30 2500 0 171 150 5000 P 178 2 5000 S 181 2 10000 Minimum Detectable Level Released MAY 2000 G2350A AED Service Manual 50 Installation Specifications Sample chromatograms and tabulated data The sequence s printed output should be similar to the samples below The chromatograms and data are provided for reference and are not part of the G2350A specifications Counts 1 296 1 948 4 589 1 585 1871 2 181 2 342 22 612 8 041 3492 30000 25000 20000 2 417 15000 10000 2 506 5000
136. ly PDA to main PCB cable assembly Spectrometer Spectrometer assembly Lens mount assembly including e Lens e Lens keeper e Lens keeper O ring e Lens mount cone e Lens mount liner e Lens mount liner O ring e Lens O ring Tools needed Two 5 16 inch open end wrenches 7 16 inch open end wrench 9 16 inch open end wrench Posi drive Released MAY 2000 G2350A AED Service Manual 61 Optical Assembly Maintenance PDA PDA Replace the PDA and PDA preamplifier board as described below Warning High Voltage To reduce risk of electric shock disconnect the power cord from the AED 1 Turn off the AED 2 Lower the AED front facing and open the front lid 3 Turn off the spectrometer purge nitrogen at the source 4 Move the cavity to the service position See Moving the cavity assembly to the service position on page 91 5 Usea 9 16 inch and 7 16 inch wrench to remove the spectrometer purge line 6 Removethe spectrometer cable the lens purge and cavity vent tubing and the spark plug and wire 7 Remove the spectrometer and lens mount assembly from the enclosure by sliding it all the way to the left and then lifting 8 Stand the spectrometer on its end so that the PDA faces up Figure 35 PDA and spectrometer assemblies top view 9 Remove the two screws holding the PDA in the spectrometer Released MAY 2000 G2350A AED Service Manual 62 Optical Assembly Maintenance Spectrometer 10
137. m the switch 6 Removethe two mounting screws holding the pressure switch in place Remove the water hose and clamp 7 Remove and replace the switch Released MAY 2000 G2350A AED Service Manual 123 Warning Water Flow System Maintenance Water Pump Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED 8 Re assemble in reverse order See also Water Flow System on page 170 If your AED serial number is gt US01000166 You cannot replace the pressure switch alone If the pressure switch fails replace the water board See Water board on page 130 See also Water Flow System on page 170 Water Pump These instructions describe how to install a replacement water pump into a G2350A Atomic Emission Detector Coupling Pump motor Pump head Mounting bracket Figure 90 Water pump assembly part no G2350 61445 Released MAY 2000 G2350A AED Service Manual 124 Warning Water Flow System Maintenance Water Pump Prepare for service High Voltage To reduce risk of electric shock disconnect the power cord from the AED Do not operate the AED with the water drawer open High Temperature Before tou
138. main carton from around the AED Remove the packing foam mm GPIB cable Remove covering Figure 4 Location of GPIB cable Remove the GPIB cable packing foam and the plastic bag covering the instru ment The AED weighs 37 kg 80 Ibs 5 Remove the G2350A AED from the box Use the hand holds in the AED frame while moving and lifting the AED 6 Placethe AED on the work bench or other sturdy work surface and arrange as desired Be sure to leave room for connections to the gas cylin ders the nitrogen dewar the GC and the ChemStation 7 Lift the front lid of the AED enclosure until the retaining arm on the right hand side of the enclosure clicks into place If desired remove the front Released MAY 2000 G2350A AED Service Manual 22 10 Installation Uncrating your AED lid Lower the front facing Remove the four screws in the top lid and remove the top Set the voltage selection switches on the AC board to the proper setting for your line voltage See Voltage selection switches on page 73 Remove the foam packing from the top of the spectrometer and remove the tape holding the spectrometer cable onto the spectrometer Firewall Reinstall top screws after removing the shipping bracket Shipping bracket Figure 5 Unpacking the spectrometer 11 12 13 14 15 Using a long necked posi drive remove the four mounting screws on the spectrometer shipping bra
139. mbly G2350 61140 Released MAY 2000 G2350A AED Service Manual 248 Gas drawer Replacement Parts Gas drawer Solvent vent 7 High flow 7 xygen 7 7 Auxiliary Figure 159 Hydrogen 7 Gas drawer regulators solenoids and gauges tubing not shown Number Description Part number Oty Assy Gas drawer G2350 60530 1 Regulator 0 15 psi back pressure 19246 60560 1 2 Gauge 10psi 62350 60590 1 3 AED mass flow assembly 05921 61210 1 Mass flow controller 400 cc min 19362 60575 1 Nut 1 8 tubing brass ferrule O ring M8 4 60 psi pressure gauge 19363 60505 1 5 0 60 psi forward pressure regulator 19246 60540 1 6a Ash filter assembly 62350 60990 1 6b Filter tube fly ash 3150 0417 1 7 AED solenoid assembly 05921 61200 5 Cap solenoid valve G1544 60560 8 Bulkhead union 0100 1698 2 9 Plug in elbow 0100 1699 2 Released MAY 2000 G2350A AED Service Manual 249 Replacement Parts Gas drawer 6j 7 5 8 1 2 3 9 Figure 160 Gas drawer manifolds and weldments Number Description Part number Oty assy 1 Make up manifold assembly G2350 61192 1 2 1 8 inch teflon tubing 0890 0746 48 inches 3 Union 05921 21370 4 4 Flange free fitting 0100 1877 1 Bushing 0100 1504 1 5 Purge manifold assembly G2350 61390 1 6 1 8 inch tee union 0100 0053 1 7 Purge brazement 1 8 inch G2350 81090 8 Manifold assembly G2350 60540 1 9 Jumper brazement purge 62350 80670 1 NS I
140. ming reagent gas lines and the manual flow controller e Receives incoming reagent gases and any helium from the high flow sole noid and distributes the reagent helium mixture to the reagent solenoids while exhausting excess reagent flow to vent e Receives incoming reagent gases from the solenoids combines them with the main helium flow and directs the combined flow to the cavity e Uses restrictors one through six to vent approximately 20 mL min of each reagent through to vent and allows approximately 0 1 mL min each to flow through to the reagent solenoids e Uses restrictors seven through nine to allow 4 mL min of helium to merge with the reagent gases and augment their flow and delivery times e Uses restrictors 10 through 12 to regulate the flow rate out of the reagent solenoids Solenoids The solenoids are controlled by the main board through the main harness cable assembly at P100 The solenoids set the flow mode see Gas Flow System on page 157 and Solenoids on page 167 Forward pressure regulator The forward pressure regulator is used to manually adjust the flow rate of incoming helium The inlet pressure in manifold 2 registers on a pressure gauge on the front panel and is always set to 30 psi Back pressure regulator The back pressure regulator controls the flow exiting through the cavity vent and is normally set to 1 5 psi The pressure gauge is on the front panel Released MAY 2000 G2350A AED Service Manu
141. n Suppliers of helium getters and nitrogen generators Nitrogen Generator Suppliers Whatman SARL BP 255 4 Av de la Creativite 59665 Villeneuve D Ascq Cedex France Phone 30 47 30 48 Telex 136268 Fax 30 47 30 48 Whatman Japan Limited 6th and 7th floor Akihabara MF Bldg No 28 14 8 Soto Kanda 6 chrome Chiyoda Ku Tokyo 101 Japan Phone 81 3 3832 6412 Fax 81 3 3832 6452 Whatman Asia Pacific Pte Ltd 171 Chin Swee Road 08 01 San Centre Singapore 0316 Phone 65 534 0183 Fax 65 534 5627 Released MAY 2000 G2350A AED Service Manual 18 Installation Preparing your gas sources Preparing your gas sources In order to minimize AED installation time first install all the gas tanks and check that all other required equipment including regulators purifiers filters and tubing is available Gas system considerations The configuration of the gas system can effect AED performance and safety Note the following as you set up your gas system e Use only regulators having dual stainless steel diaphragms with 1 8 inch swage fitting connections e If you wish to use GC inlet pressures gt 80 psi you must use a helium regu lator with an outlet pressure of at least 110 psi e Make all gas connections with Vespel ferrules when possible Brass fer rules are not recommended When connecting helium lines to the getter use stainless steel ferrules The getter produces high temperatures that can melt plastic
142. n this instrument The customer should not open the top rear cover which is secured by Screws Notice Warnings in this manual or on the instrument must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions violates safety standards of design and the intended use of this instrument Agilent Technologies assumes no liability for the customer s failure to comply with these requirements Safety Symbols used in this manual WARNING A warning calls attention to a condition or possible situation that could cause injury to the user CAUTION A caution calls attention to a condition or possible situation that could damage or destroy the product or the user s work Safety Symbols marked on the instrument A Caution Refer to accompanying instructions A Indicates a hot surface A Indicates hazardous voltages Indicates earth ground terminal On O off Sound Emission Certification for Federal Republic of Germany Sound pressure LP lt 49 1 dB During normal operation At the operator position According to ISO 7779 Type Test Schallemission Schalldruckpegel LP 49 1 dB Am Arbeitsplatz Normaler Betrieb Nach EN27779 Typpr fung Released MAY 2000 G2350A AED Service Manual G2350A Atomic Emission Detector Service Manual Contents Chapter Installation Introd ctiOn nee et ott ett
143. n tool before trimming 7 Tighten the column nut into the fitting on the tool This properly swages the ferrule onto the column Use white correction fluid to mark the col umn just behind the nut If the column slides in the nut the mark will move showing the problem Released MAY 2000 G2350A AED Service Manual 113 Gas Flow System Maintenance Column installation changing columns White alignment mark Column nut Figure 81 Swage the ferrule onto the column 8 Usea column cutter to score the column and cut it flush to the end of the tool 9 Remove the column from the tool 10 Install the column in the GC injector in accordance with the 6890 GC Ser vice Manual Condition at about 20 to 30 degrees above the highest operat ing temperature for one hour 11 Slide the column into the transfer line and tighten the column nut into the fitting Make sure that the white correction fluid mark is still visible and properly positioned 12 Close the GC oven Released MAY 2000 G2350A AED Service Manual 114 Warning Gas Flow System Maintenance Solenoid valve assembly Solenoid valve assembly Hydrogen High flow Auxiliary Oxygen Solvent Vent Figure 82 Solenoid valve assemblies To replace a solenoid valve assembly Hydrogen Gas To reduce risk of explosion fire and injury ensure that hydro gen gas is only connected to the gas inlet on the side panel labeled HYDROGEN
144. nce verification Verifying performance Once all the GC AED ChemStation components are set up and ready to operate the AED must be tested to verify its performance Agilent Technolo gies provides test samples and pre programmed recipes for this purpose Also verify performance after significant repair has been performed Agilent Technologies provides 3 ChemStation methods and 1 sequence which are used to verify performance Method CKO TIME M checks the retention time Sequence CKO_TST S runs methods CKO_RUN1 M and RUN2 M which check if the instrument is operating within specification Procedure 1 Install the standard checkout column part number 19091Z 012 in the GC and condition it as described in First start up on page 41 2 Set upthe gas flows to the original factory conditions as described in First start up on page 41 3 Place a vial of AED checkout sample 1 part number 8500 5067 in posi tion 1 of the auto injector or tray and place a vial of AED checkout sample 2 part number 8500 5067 in position 2 Released MAY 2000 G2350A AED Service Manual 47 10 11 12 13 14 Installation Verifying performance Display the AED Spectral Plot on the ChemStation View AED spec tral plot on off From the Instrument menu display the main AED screen After the checkout column in the GC is conditioned and all hardware is connected load method TIME M Select Method Load Method CKO
145. nd pump eene 243 Released MAY 2000 G2350A AED Service Manual Chapter 7 Replacement Parts Introduction nei taverns eee ege eere E sp e nb doa de dee ee reped 245 Gas drawer changes esses eene nnne nennen nnne enne 245 Water drawer change 1 5 terere eren E eh 245 Electrical components 1 246 Emission source assembly esses 247 Fro t assemblies eee SA A a a A ae 248 Gas drawer ee REN eee eee Pea n IE et gere 249 Heated transfer line 2 Lens mount assembly eee eene entente eren 254 Sparker assembly 5 etae eim imu cate ee reset ie ades 255 Spectrometer assembly eene 256 Water drawer AED serial gt 1000166 essere 257 Water drawer AED serial no lt 1000166 sese 261 Released MAY 2000 G2350A AED Service Manual Installation Miodu HOn emerce teet erroe Seve e 11 Preparing your work station eese ener 12 Suppliers of helium getters and nitrogen generators 17 Preparing your gas sources 19 Installing your ChemStation software 20 Uncrating your 21 Connecting control cables e
146. ng a posi drive Quae On ipo nS Install a new ignition module Released MAY 2000 G2350A AED Service Manual 83 Warning Warning Caution Electronics Maintenance Transformer Ignition coil Replace the ignition coil as described below High Voltage To reduce risk of electric shock disconnect the power cord from the AED High Voltage To reduce risk of electric shock the ground strap for the magne tron power supply must always be connected to the waveguide when the AED is in operation Turn off the AED and unplug the power cord Open the top cover Remove the two blade connectors and the spark plug wire Remove the four M4 mounting screws using a posi drive oF sg m ce Install a new ignition coil Transformer Figure 54 Transformer To replace the transformer High Voltage To reduce risk of electric shock disconnect the power cord from the AED The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics Released MAY 2000 G2350A AED Service Manual 84 QV cer gau ib Electronics Maintenance Transformer Turn the AED OFF and unplug the power cord Remove the front lid lower the front facing and open the top cover Slide the water drawer out Remove the transformer connector
147. ng the heat ers Q1 Q2 Q3 when activated by the main board Magnetron temperature control circuit The magnetron operates most efficiently at 94 C and is cooled by a variable speed fan to maintain that temperature The control circuit on the AC board operates the fan as follows e Below 94 C the fan does not run e At 94 C the fan starts e Ifthe temperature increases while above 94 C the fan speed increases e Ifthe temperature decreases while above 94 C the fan speed decreases e Ifthe temperature goes above 175 C there is a temperature runaway prob lem The fan runs at full speed and the power to the magnetron is shut down The PRT reads 147 ohms at 94 C The AC board compares the actual PRT resis tance to a set point of 147 ohms and adjusts the variable speed fan accordingly See also PRT resistance vs temperature on page 179 Contactors The AC board uses two contactor switches to deliver power on command The first K1 enables 120 V to get to the heated zone circuitry Contactor K2 pro vides low voltage power to the high voltage power supply when all components of the instrument are ready for plasma ignition High voltage enable The high voltage enable circuit uses a wire running from the AC board to the high voltage power supply At a signal from the main board the voltage in this wire drops to 0 2 0 3 V and the power supply delivers 2340 V to the magnetron A relay controls primary power to the high v
148. nlet weldment 05921 80730 1 NS Jumper weldment 8 inch 19243 80560 NS Hp fitting nut 05921 22110 1 Released MAY 2000 G2350A AED Service Manual 250 Replacement Parts Gas drawer Ferrule vent Cavity vent Figure 161 AED flow restrictors Released MAY 2000 G2350A AED Service Manual 251 Replacement Parts Gas drawer AED Flow Restrictors see Figure 161 Number Description Part number Oty assy R1 FID H2 restrictor 19231 60770 1 R2 NPD H2 restrictor 19234 60660 1 R3 NPD H2 restrictor 19234 60660 1 R4 Rz restrictor 0100 1473 1 R5 Rz restrictor 0100 1473 1 R6 Rz restrictor 0100 1473 1 R7 NPD H2 restrictor 19234 60660 1 R8 NPD H2 restrictor 19234 60660 1 R9 NPD H2 restrictor 19234 60660 1 R10 NPD H2 restrictor 19234 60660 1 R11 NPD H2 restrictor 19234 60660 1 R12 NPD H2 restrictor 19234 60660 1 R13 AED makeup restrictor 0100 1521 1 R14 FID H2 restrictor 19231 60770 1 R15 1 16 inch tubing restriction 1 R16 1 16 inch tubing restriction 1 R17 1 16 inch tubing restriction 1 Released MAY 2000 G2350A AED Service Manual 252 Heated transfer line Figure 162 Heated transfer line Replacement Parts Heated transfer line Number Description Part number Oty Assy Heated transfer line G2350 61300 1 Heated core assembly 62350 80780 1 1 16 inch graphite ferrule 10 pk 0100 1326 1 16 inch gas union SS tubing nut each 0100 0053 2 Insulation jacket assembly G2350 61240 1 3 Column setting tool G2350 8061
149. not read 8 A then check the AC board See Figure 132 AC board Check the fuses on the AC board Check the output at con nectors P1 P4 Check the triacs See Figure 132 AC board Check the output from the contactor If there is no output from the contactor troubleshoot the main board or replace it See Figure 133 Main board Replace the high voltage power supply Check the gauges The high voltage gauge should read 22 KV If it does check the cabling and the main board If it does not read 22 KV then continue with the actions below Power cycle the AED and watch the gauges on the power supply When the AED is first turned ON the filament cur rent reading should go full scale then settle at approxi mately 8A 4A Y 2 for scale If there is no filament current then there is a problem at either the connection between the power supply and the magnetron or the power supply is bad or the magnetron is bad Verify that the PRTs and heaters are working properly the water pump system is delivering proper flow and that the microwave is at temperature See Plasma shut off circuits on page 177 and also PAT resistance vs temperature on page 179 Check the voltage in the high voltage enable circuit Pin 4 of the supply cable If the voltage is near 0 enabled replace the power supply If not check the cabling See Figure 139 G2350A internal cabling diagram Released MAY 2000 G2350A AED Service Manual 185 Electronics Tr
150. nstall a new water drawer into the slides 8 Check for clearance interference at e The high voltage power supply connector on the emission source assembly e emission source support clip e The tubing in the drawer e cables at the rear of the drawer e The transformer Released MAY 2000 G2350A AED Service Manual 134 Water Flow System Maintenance Water filter Also verify that e white roller on the emission source assembly lock cleanly engages in the square cutout in the drawer e The emission source lock locks in both positions e The tab on the left water drawer slide is flush with the guide rail Figure 102 Drawer tab 9 Fill the new system with distilled water See Water filling on page 37 Warning Do not operate the AED with the water drawer open Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED 10 Drain the water from the old drawer Water filter If your AED serial number is US01000166 To replace the water filter Warning High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperatu
151. nt condensation on the optics See also Helium Getter Suppliers on page 17 Suppliers of helium getters and nitrogen generators Listed below are suppliers of helium getters and nitrogen generators Table 6 Helium Getter Suppliers SAES Pure Gas Inc Valco Instruments Co Inc 4175 Santa Fe Road P O Box 55603 San Luis Obispo CA 93401 USA Houston TX 77255 USA Phone 805 541 9299 Phone 713 688 9345 Fax 805 541 9399 Sales 800 367 8424 Fax 713 688 8106 SAES Getters Japan Co Ltd No 2 Gotandafujikoshi Bldg Valco Europe 5 23 1 Higashi Gotanda Unterannberg 7 CH 6214 Shinagawa Ku Tokyo 141 Schenkon Switzerland Phone 81 3 5420 0435 Phone 045 21 68 68 Fax 81 3 5420 0439 Fax 045 21 30 20 Telex 868342 SAES Getters Deutschland GmbH Gerolsteiner Stassel 5000 Koln 41 Phone 49 221 44 30 86 Fax 49 221 44 10 95 Telex 887700 Released MAY 2000 G2350A AED Service Manual 17 Table 7 Whatman Inc 260 Neck Road Box 8223 Havenhill MA 01835 0723 800 343 4048 or 508 374 7400 Fax 508 374 7070 Whatman Canada Ltd 2495 Haines Road Mississauga Ontario L4Y 1Y7 800 667 2917 or 905 272 1516 Fax 905 272 7074 Whatman International Limited Whatman House St Leonard s Road 20 20 Maidstone Kent ME16 OLS England Phone 01622 676670 Fax 01622 677011 Whatman GmbH Auf der Krautweide 32 6232 Bad Soden Ts Germany Phone 0 61 96 64 30 26 Fax 0 61 96 2 22 53 Installatio
152. nto the gas union Released MAY 2000 G2350A AED Service Manual 35 Installation Installing your transfer line Figure 22 Installing the heated core onto the gas union 10 Slide the insulation tube onto the heated cavity block and secure with the set screw Do not over tighten Tighten set screw Figure 23 Installing the insulation tube 11 Readjust the spacing between the GC and AED as necessary to keep approximately 1 inch of the transfer line inside the GC oven Make sure the GC AED alignment is correct per Figure 21 Released MAY 2000 G2350A AED Service Manual 36 Installation Water filling Column LP Ferrule White E 9 b Column nut alignment y marking 1 Figure 24 Adjusting the space between the GC and AED Water filling The AED requires a flow rate of 370 mL min to 430 mL min of distilled water for cooling the discharge tube during operation Before using the AED for the first time fill the water reservoir as follows Warning Do not operate the AED with the water drawer open Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED 1 Lift the emission source lock to release the water drawe
153. nual 139 Water Flow System Maintenance Flow sensor Figure 106 Potentiometer Released MAY 2000 G2350A AED Service Manual 140 Theory of Operation cop Rue e nU el Ce qud sce AUI 142 Optical Assermbly siae ie tior terc eR REESE 144 Spectromieter conecte tite oec T Et eden 144 PDA nna eem 145 Electronics Aid 146 AED electronics in eee 146 AC DOANE tta et netiis 147 Main board unten e NI 150 Sparker board oot Ap pet eS 152 Water board EUR BR 153 Power supply rtr reete erret io eae io di de rede acus 154 Service display board 155 Emissi n OU Ce esatta Te Oen 156 Emission source assembly esses 156 Emission source safety switch seesseeeees 156 Gas Flow System 157 OVOLVIQGW occur uico Hak toco a nete et he 157 Flow modes ure xe 158 Gas drawet i rase dos cto vt esas fe ER 165 Sol nolds ee eei ete 167 Water Flow Systemi sii ose boot ANI AREA 170 Water drawers using a flow sensor eese 170 Water drawers without a flow sensor 172 Water drawer sensors switches and connections 174 Released MAY 2000 G2350A AED Service Manual 141 Overview Theory of Operation Overview The AED is
154. o cool down to 35 C or less 3 Turn off the AED High Voltage To reduce risk of electric shock disconnect the power cord from the AED 4 Disconnect the heated transfer line and heated core and slide the spec trometer back as described in Moving the cavity assembly to the service position on page 91 Pull the water inlet and outlet hoses from the cavity assembly Slide the water drawer out See Water drawer on page 133 Loosen the two thumbnuts in the emission source lock and lift the lock 9o GO Slide the emission source assembly out until the power supply cable is accessible Released MAY 2000 G2350A AED Service Manual 105 Warning Warning Warning Emission Source Maintenance Emission source assembly Heater sensor cable Groundwire Power Figure 74 Emission source connections 9 Disconnect the ground wire from the enclosure 10 Remove the cable and ground wire 11 Remove the heater sensor cable Microwaves Never remove the screws attaching the cavity to the waveguide or the screws which fasten the cavity halves together Never operate the G2350A AED when the cavity magnetron or waveguide are disassembled or mechanically loose If stray microwave emission is suspected and or is measured above 5 mW cm at a distance of 5 cm shut down the instrument immediately and call the Agi lent Service Department for service 12 Remove the emission source assembly Be sure to
155. o effectively operate the G2350A To install and learn how to use the ChemStation software please refer to the Installing and Understanding Your GC AED ChemStation booklet which was provided with the ChemStation Note that if you purchased a complete GC AED ChemStation system from Agilent Technologies the proper ChemSta tion software was loaded onto the computer at the factory Released MAY 2000 G2350A AED Service Manual 20 Installation Uncrating your AED Uncrating your AED Figure 2 G2350A AED shipping crate Tools needed Flat head screwdriver Long necked posi drive 7 mm wrench or socket driver 7 16 inch open end wrench 9 16 inch open end wrench Uncrating Uncrate the G2350A AED as follows 1 Make sure enough bench space is clear for the AED You will need at least 41 x 52 x 57 cm 16 x 21 x 23 inch plus room to make the gas piping and electrical connections Leave at least 13 cm 5 inch to the right and rear of the AED if possible Cut the packing straps and open the top portion of the box Remove contents list ship kit transfer line GPIB cable learning products envelope power cable and checkout sample s See the contents list below Released MAY 2000 G2350A AED Service Manual 21 Caution Installation Uncrating your AED Learning products Heated transfer line Checkout sample Power cable Ship kit Figure 3 Hardware and learning products 4 Remove the
156. oard Released MAY 2000 G2350A AED Service Manual 76 Warning Caution Electronics Maintenance Main board Main board Replacing the main board Replace the main board as described below High Voltage To reduce risk of electric shock disconnect the power cord from the AED The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics 1 Turn OFF the AED and unplug from main power Open the top cover Remove the connectors at J100 J102 J252 P101 P100 P500 J251 Released MAY 2000 G2350A AED Service Manual 77 Electronics Maintenance Main board i n 9 00 C C Heat sinks ji 000008 d q ci 3C 31 pencil Q ES 885 peel L 3 3 LH C36 FG 0 3 Fao P i cc cm S 4 E 1 Sool e ji 4 i 78 24 12 20 4 J100 T al E di IL v B Figure 49 Main board test points connectors 4 Remove the eight board mounting screws using a posi drive 5 Lift the board out of the AED and set aside 6 Verify the GPIB address on the new board is set to the default setting 15 or the setting configured by the user
157. oltage power supply Released MAY 2000 G2350A AED Service Manual 149 Electronics Theory of Operation Main board Main board Figure 112 Main board The main board provides most of the control logic for AED operation includ ing the switching functions of the AC board The board receives the input data from the ChemStation and translates them into the specific tasks required to run the AED The following is a summary list of tasks e Monitors and controls temperature in the cavity microwave emission source and transfer line e Monitors the water board operation e Monitors the status of the other internal components verifies plasma shutoff circuits e Controls the ignition spark the microwave emission source the high volt age power supply the optical assembly and all the gas flows e Communicates with the ChemStation The main board can be divided into six functional parts e Power supply e Processor CPU RAM and ROM I O control GPIB communications control e Motor control e PDA control Solenoid control Released MAY 2000 G2350A AED Service Manual 150 Electronics Theory of Operation Main board Power supply Input power of 40 V AC enters the main board at P500 and goes through two fuses F501 and F500 If one of these fuses is blown a capacitor holds up the voltage The 40 V AC is first converted to unregulated 24 V DC which is then regulated by a 5 V DC regulator and a 15 V DC regul
158. olvent vent and high flow valves Expected Source gas condition Helium source pressure 50 psi Oxygen 30 psi Hydrogen 50 psi Nitrogen methane 70 90 psi 10 Check the helium supply pressure on the front panel Adjust it to 30 psig using the helium regulator Check the cavity pressure on the front panel Adjust the cavity pressure 1 5 psig Open the ChemStation software The ChemStation can be started by click ing on the ChemStation Group icon on the Program Manager screen When the ChemStation window appears double click on the Instrument 1 On Line icon This will start the ChemStation Once the ChemStation is run ning it will load the last method used and the AED Real Time Spectral plot should be displayed If the AED Real Time Spectral Plot window is not dis played it can be brought up by selecting View AED Real Time Spectral Plot on off Once the spectral plot is displayed the AED status can be checked from the ChemStation Connect a flow meter to the purge vent Measure the flow rate and record Adjust the back pressure regulator cavity pressure until the head pres sure is 0 Re measure the purge flow and record Move the flow meter to the cavity vent Adjust the mass flow controller makeup gas until a flow rate of 60 to 70 mL min is obtained Re measure the purge vent flow rate and record it Next measure the cavity vent flow rate The flow rate should be equal to the purge flow rate 25 mL min
159. on the AC board at P5 Using two 9 16 inch wrenches remove the nut and bolt in the center of the transformer and remove the transformer Install a new transformer so that the wires are as shown in the picture Note that the lead from the transformer with the white wrapped bundle is on the left and both leads exit the coil on vertical tangents Installing the transformer in a different orientation may cause interference with the water drawer Connect the new transformer to the AC board Use a tie wrap around the wiring if needed to keep the wires from interfering with other cables Released MAY 2000 G2350A AED Service Manual 85 Emission Source Maintenance Replaceable components Emission Source Waveguide Waveguide transformer cL Magnetron A um Figure 55 Emission source waveguide and waveguide transformer The microwave emission source waveguide and waveguide transformer are all replaced as an assembly Other components are replaced individually as part of routine and unscheduled maintenance Replaceable components Emission source assembly emission source waveguide and waveguide trans former Cavity heater PRT assembly Exit chamber Optical side water chamber Heater block Discharge tube kit including e Discharge tube e O ring e Gas union assembly GC side water chamber Released MAY 2000 G2350A AED Service Manual 86 Emission Source Maintenance Tools
160. on the grating motor assembly in the spectrometer to monitor the motor function It is in series with the cavity PRT circuit If the grating moves too far the switch opens and the high voltage to the emission source is stopped Similarly if the switch fails open or if the spectrometer cable is not fully connected the high voltage is stopped and will not start See also Figure 107 and Plasma shut off circuits on page 177 PDA The PDA consists of 512 photo sensitive diodes which register the intensity of light directed at their surface As the light from the mirror is splayed across the PDA surface diodes receiving light from atomic lines send out a voltage which is relayed to the PDA preamplifier board The intensity of light determines the voltage transmitted by the diodes The PDA uses four to five pixels per nanom eter The PDA preamplifier board amplifies the analog output signals from the 512 diodes and transmits them to the A D converter on the main board for pro cessing In this way the characteristic atomic lines of each element present can be isolated and the composition of the compound determined Since the output voltage from a diode depends on the quantity of photons strik ing its surface PDA function is affected by the following spectrometer and assembly conditions e Contamination in the optical assembly whether gaseous or deposited e Mirror alignment e Grating alignment e Mounting of the PDA to the spectrometer Se
161. on will not leak This test requires that the discharge tube gas union and exit chamber are installed as well as the following equipment Tubing Gas tight syringe Pressure gauge Tee union Surgical forceps or similar clamp Connect a clean air source to one of the water chamber fittings at the top of the cavity Attach a pressure gauge to the other fitting may require a plug with a gauge installed See Figure 72 below Pressure gauge Tee union Tubing Forceps Gas tight syringe Figure 72 Cavity gross leak test 3 Briefly pressurize the water chamber to 40 psig If the pressure rapidly drops there is a problem in the discharge tube installation If the pressure drop is less than 1 psi 5 min the tube is correctly installed A leak rate of 1 psi min or greater indicates a leak Released MAY 2000 G2350A AED Service Manual 104 Warning Warning Emission Source Maintenance Emission source assembly Emission source assembly Waveguide Waveguide transformer Magnetron Figure 73 Emission source assembly Replace the emission source assembly as follows High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Using the ChemStation software disable the heated zones in the AED 2 Allow the cavity and heated transfer line t
162. ons Air is trapped in the water sys Misaligned water filter The Loosen the water filter and rotate it until the outlet fit tem water filter must have the out ting is at the top let fitting at the topmost ver tical position in order to let air escape the system Damaged flow sensor If the water filter is correctly installed see above replace the flow sensor A m Verifying the actual water flow rate To verify the actual water flow rate follow the steps below Note that it is best to verify the water flow rate before troubleshooting on any potential flow rate problem 1 Power down the AED 2 Attach a rubber tube to the return nozzle of the water reservoir 3 Place the end of the rubber tube in a graduated cylinder 4 Turnonthe AED but do not start the plasma 5 Measure the water flow and the time to check the flow rate 6 Add distilled water if necessary to the bath to keep the AED running while measuring 7 Power down the AED 8 Disconnect the rubber tube from the water return nozzle PO Water board LED diagnostics G2350 60080 only If the LED is flashing the flow rate is less than 370 mL min If the pump is running the flow is above 250 mL min and the problem may be a worn pump head or a restriction If the pump is off check for a leak or blockage and make sure the flow sensor and pressure switch are operating normally Released MAY 2000 G2350A AED Service Manual 203 Water Flow System Troublesh
163. ontrol EEES TRE 151 PDA cOnttol E ete etr ree auc 151 Solenoid control e terere edendis 151 Sparket Board ee ee ete ec te agrees 152 Regulator board eee ettet eerte ire rere 152 Tenition module e e ete afecte er bots 153 Ienitioreoll o e Re eee 153 Water voro 153 32950 00080 rre ERES 153 32350 60085 m tee eek E EPI 154 Power supply 2 eee v ee etta eee Rea RR e 154 service displa3 board uu sc etes ete e edite 155 Emission Source Emission source assembly esses eene enne 156 Emission source safety switch 156 Gas Flow System OVORVIC ETE 157 Infos aiios RES 158 Components eem p dg est 165 Gas Ora Wer eid ER UM 165 Inlets and outlets ere eter 165 Flow control 165 Released MAY 2000 G2350A AED Service Manual Contents Example of reagent and helium flow 167 Spectrometer lens purge nennen nennen enne nns 167 SolenoidS ueteri ee reete tei dre 167 Water Flow System Water drawers using a flow sensor eese 170 Water TOW path tar eter ete eret eere are edes 171 Water pump control eene eene enne entente 171 Water drawers without flow sensor eese 172 Water
164. ooting Water leaks LED Figure 138 Waterboard LED location Water leaks Problem Possible cause Suggested actions Water leaks Poor seal at fittings Loose clamp Discharge tube ferrule and O ring need replacement Discharge tube is cracked GC Side Water Chamber GC Side Brazement and or Optical Side Water Chamber not aligned properly Wrap the fitting with Teflon tape Replace the hose clamp if still leak ing If still leaking after replacing the hose clamp replace the part with the fittings Tighten replace hose and clamp Replace the discharge tube ferrule and O ring if worn or damaged Replace discharge tube ferrule and O ring Disassemble and reassemble Check the O rings for damage and proper seating If the GC Side Water Chamber GC Side Brazement and or Optical Side Water Chamber show signs of damage replace them Released MAY 2000 G2350A AED Service Manual 204 5 Error messages Err r MICSSASES TEN 206 BAD CAVITY READING BAD XFR LN RDG 206 CAVITY OVERHEAT XFER LN OVERHEAT 207 CAVITY NOT HEATING XFER NOT HEATING 207 CAVITY TEMP XFER LINE TEMP eene 207 HIGH VOLTAGE OFF 207 NO CAVITY SENSOR NO TRANSFER LINE 207 SPECTRE NO WATER ecce eet tatto tg 208 TRIAC INTERRUPT ertet tegere 208 Released MAY 2000 G2350A
165. or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED 1 Close the water drawer and connect to power 2 Check for water leaks Water board If your AED serial number is US01000166 Figure 96 Water board assembly To replace the water board assembly High Voltage To reduce risk of electric shock disconnect the power cord from the AED High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves The following steps require protection from electrostatic discharge ESD Use a grounded wrist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics Released MAY 2000 G2350A AED Service Manual 130 Warning Water Flow System Maintenance Water board 1 Power down the AED 2 Remove the power cord in rear of instrument 3 Lower the front facing and remove the water drawer See Water drawer on page 133 Label the wires leading to the pump fan and water flow sensor if needed Remove the connectors from the board Using a posi drive remove the two mounting screws which secure the water board panel in the drawer and remove the board and panel Figure 97 Board panel removal 7 Remove
166. oubleshooting Troubleshooting the high voltage power supply General troubleshooting Enable the high voltage using the ChemStation 2 Check pin 3 of P500 on the main board It should read 0 2 0 3 V approxi mately 0 V to ground If it reads 5 V the main board has not enabled the high voltage 3 With the high voltage enabled the power supply s fan should be running If the fan is off the power supply is not delivering power to the fan and there should be no dial readings on either the filament or the high voltage dials Check the connection to the AC board and check that the AC board is delivering power Pin 1 of connector P4 on the AC board should be car rying primary line voltage to the power supply 4 Turnthe AED OFF then turn it back ON When the AED is first turned ON the filament current reading should go full scale then settle at approxi mately 8A 4A x 2 for scale If there is no filament current then one of the following problems exists e Faulty connection between the power supply and the magnetron e Power supply is bad e Magnetron is bad Comments e Ifthe connection between the magnetron and power supply was bad or broken for any reason turn the AED OFF reconnect and wait approxi mately 1 minute before turning the AED ON again e The AC board high voltage power supply circuit is a latched circuit If the filament current ever reaches 10A and stays at 10A an overvoltage protection engages The cir
167. ow any Reagent O CHJ N e Total flow rate 150 to 300 mL min 02 Solenoid 51 off D2 or 02 Helium H2 Solenoid S2 off E H2 or H2 Helium He CH4 N2 Solenoid S3 off CH4 N2 or CH4 N2 helium Solvent Vent Solenoid S4 off Static or Exhaust High Flow Solenoid 55 ON Helium column flow fpr forward pressure regulator mfc manual flow controler bpr back pressure regulator m1 main manifold block m2 secondary manifold block ferrule cavity gage 1 helium head pressure gage vent vent gage 2 cavity pressure gage ri to r17 pneumatic restrictors Gas flow system Window purge Makeup gases gt Makeup Gases gt Column flow Makeup Gases gt Spectrometer window purge Gases All Gases Cavity flow detail Figure 119 Gas flow system in high flow mode Released MAY 2000 G2350A AED Service Manual 161 Gas Flow System Theory of Operation Flow modes Solvent vent Description With the vent closed the lens purged flow is forced to back flow through the discharge tube to prevent solvent spike contamination The gases flow through the solvent vent solenoid and out to waste for a time set using the ChemStation e Solenoid s energized Solvent vent e Total flow rate 80 mL min 02 Solenoid S1 off SS 02 or 02 Helium H2 Solenoid S2 off E H2 or H2 Helium He CH4 N2 Solenoid S3 off CH4 N2 or CH4 N2 helium Solvent Vent Solenoid 54 ON Static or
168. properly attached to the spectrometer housing Replace or clean the lens Released MAY 2000 G2350A AED Service Manual 200 Spectrometer and Chromatography Troubleshooting PDA output not registering PDA output not registering Problem Possible cause Suggested actions PDA output not registering at Loose connection at the PDA Check the cable Reconnect it See Figure 139 G2350A the main board or main board internal cabling diagram PDA or PDA preamplifier not Change the PDA and re test at the PDA connector and at functioning properly J251 on the main board If the problem persists see Trou bleshooting the main board on page 183 PDA cable is damaged Check connectors for cleanliness and clean if necessary Replace the cable and re test See Figure 139 G2350A internal cabling diagram Sensitivity is poor Problem Possible cause Suggested action Sensitivity is poor or molec PDA is damaged Run the test to verify PDA performance See Verifying PDA ular lines have sections performance on page 201 Replace the PDA if necessary missing UV wavelengths missing Problem Possible cause Suggested action UV wavelengths are not PDA is defective Replace and re test the PDA See also Loss of UV sensitivity being registered by the PDA on page 200 EET Verifying PDA performance To verify PDA performance replace it and compare the old and new perfor mance Released MAY 2000 G2350A AED Service M
169. r Open the lower front panel and slide the water drawer out 3 Open the water reservoir and fill to just above the upper fitting with dis tilled water Released MAY 2000 G2350A AED Service Manual 37 Installation Water filling Reservoir Figure 25 Filling water reservoir 4 Close the reservoir lid 5 Close the water drawer After starting the AED for the first time you may need to refill the reservoir Caution Do not use de ionized water De ionized water attacks the system and causes deposits to build up shortening instrument life Distilled water will keep the system sufficiently clean Do not add algal inhibitors Keep the reservoir lid closed to avoid shock hazard and prevent water loss through evaporation Check the water level daily Add distilled water to the reservoir to maintain the level near the top If the water level drops too low the plasma will shut off Do not put objects in the reservoir as they will contaminate the system If the system is to be shut down for any length of time drain the water reser voir to prevent algal growth Charge the water in the reservoir every time the discharge tube is changed dur ing the first 3 months of use Released MAY 2000 G2350A AED Service Manual 38 Installation Basic operation of your AED Basic operation of your AED Spectrometer Lens mount nut View window Cavity assembly Water drawer Fly ash filt
170. r cord from the AED GPIB cable Connect one end of the GPIB cable to the GPIB port on the AED Connect the other end to the GPIB port on the ChemStation Leave enough room behind the AED so that the cable is not bent excessively at the connector Bending may decrease connector life See Figure 12 APG Remote Ci Figure 12 Connecting cables to the G2350A AED Released MAY 2000 G2350A AED Service Manual 29 Caution Installation Connecting gas piping Remote start cable Connect the remote start cable to the remote start cable connector on the back of the AED and also to the back of the 6890 GC GC injector tray and controller if present Connect the autosampler tray and controller if present to the GC as described in the Installation Manuals Set the DIP switches on the controller if present to the settings appropriate for the configuration purchased Connecting gas piping __ bets Outlets A Oxge f Ven Bypass hl Oxygen Purge Nitrogen Vent i gt i P Figure 13 Gas inlets and outlets The AED requires constant supplies of helium and nitrogen and often requires reagent gases For a listing of the gases and purities required see Preparing your work station on page 12 and Preparing your gas sources on page 19 In general the flow rates are not adjusted after set up unless required by a certain recipe For information on how to set up the flow rates see
171. r new G2350A AED perform the following 1 Prepare your work station See Preparing your work station on page 12 2 Prepare your gas sources and lines See Preparing your gas sources on page 19 3 Install and learn how to use your GC AED ChemStation software as described in the instructions included with the ChemStation See Install ing your ChemStation software on page 20 4 Install your G2350A Hardware Installation CD ROM software See the CD ROM cover insert instructions Uncrate your AED See Uncrating your AED on page 21 6 Connect control cables between all components See Connecting con trol cables on page 28 7 Connect the AED to the appropriate gas sources and the gas chromato graph See Connecting gas piping on page 30 8 Install the transfer line between your AED and 6890 gas chromatograph See Installing your transfer line on page 33 9 Fill the AED water reservoir with water See Water filling on page 37 10 Connect the AED to electrical power See First start up on page 41 11 Install the column in the transfer line See First start up on page 41 Released MAY 2000 G2350A AED Service Manual 11 Installation Preparing your work station 12 Turn on the GC AED ChemStation adjust flow systems and run preliminary checks See First start up on page 41 13 Run verification tests on the samples provided to verify your new G2350A AED is working properly See Verifying performance on page 47
172. ransistors activate the triacs which send the control voltage to each solenoid Released MAY 2000 G2350A AED Service Manual 151 Electronics Theory of Operation Sparker board This section of the main board also controls the three sets of opto isolators and triacs which control the heated zones Zone Q1 is the transfer line zone Q2 is the cavity and zone Q3 is not used See also Table 23 in chapter 4 Troubleshooting on page 175 Sparker board Figure 113 Sparker board The sparker board generates the electrical pulse which along with the micro wave energy converts the gases in the cavity into plasma The main board con trols the sparker board The sparker board consists of the following three parts e Regulator board e Ignition module e Ignition coil Regulator board The regulator board receives power inputs of 24 V and 5 V DC The 24 V input is filtered and regulated to charge a capacitor to 13 6 V DC The 5 V input is fil tered and sent to power the board circuitry Released MAY 2000 G2350A AED Service Manual 152 Electronics Theory of Operation Water board Ignition module The main board instructs the ignition module to trigger The ignition module gives off a spark which interrupts the flow of the 13 6 V DC supply through the primary At this instant 20 kV travels out of the sparker on the ignition module coil down the spark plug wire and directly down the discharge tube through microwave energy
173. rcuit Heat 3952 kJ or 3750 BTU hr Weight 37 kg 80 Ibs Required clearance for maintenance Above 41 cm 16 inch Right 25 cm 10 inch Left 5 cm 2 inch Front 18 36 cm 7 14 inch Behind 29 cm 11 inch 6890 GC HxWxD 50 x 68 x 50 cm 20 x 26 7 x 21 inch Power 2250 VA Outlets One outlet on individual circuit Heat 8 100 kJ or 7 681 BTU hr Weight 56 8 kg 125 Ibs Required clearance Above 44 cm 17 inch for Injector Left 31 cm 9 inch for Tray Behind 13 cm 5 inch Released MAY 2000 G2350A AED Service Manual 13 Installation Preparing your work station G1519A Automatic Liquid Sampler ALS G1512A Controller HxWxD 10 x 33x 31 cm 4 x 13 x 12 inch Power 150 VA max 120 Vac at 2 5 amps Outlets 1 Heat 545 kJ or 515 BTU hr Weight 7 3 kg 16 Ibs Required clearance Behind 13 cm 5 inch The controller may be placed on its side to the left of the 6890 GC without requiring further table space than used by the 6890 with a Tray attached 18593 Injector HxWxD 44 cm 17 inch above the GC Power 200 Vac at 1 25 amps Weight 3 6 kg 7 2 Ibs 18596B Tray Hx Wx D 31 cm 9 inch left of the GC Power 220 Vac at 1 25 amps Weight 1 8 kg 4 165 G2613A Injector Hx Wx D 44 cm 17 inch above the GC Weight 3 kg 6 6 lbs G2614A Tray HxWxD 31 cm 9 inch left of GC Weight 3 kg 6 6 Ibs Released MAY 2000 G2350A AED Service
174. re or wear heat resistant gloves 1 Turn off the instrument Allow the water to cool Released MAY 2000 G2350A AED Service Manual 135 Caution Warning Water Flow System Maintenance Water filter Slide the water drawer out Remove the three clamps and hoses leading into the water filter Note the orientation of the outlet connectors on the filter Unscrew the water filter hose clamp and remove the water filter Figure 103 Removing water filter 5 Replace the water filter in the hose clamp and orient the outlet connectors to exactly the same position as noted earlier The water filter must be oriented so that the outermost outlet fitting is at the vertical or topmost position 6 Retighten the hose clamp 7 Replace the three hoses onto the water filter and tighten the three clamps Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached
175. re there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED Continue with discharge tube replacement or reassemble the cavity Released MAY 2000 G2350A AED Service Manual 90 Warning Warning Emission Source Maintenance Moving the cavity assembly to the service position Moving the cavity assembly to the service position Figure 57 Cavity assembly In order to perform certain routine maintenance procedures it is necessary to safely move the cavity into the service position To move the cavity into the ser vice position perform the following Wear safety glasses when performing this procedure High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Using the ChemStation software disable the heated zones in the AED and the GC Allow the GC cavity and heated transfer line to cool down to 35 C or less 3 Turn off AED and the GC High Voltage To reduce risk of electric shock disconnect the power cord from the AED 4 Turn off the reagent gases oxygen hydrogen and methane nitrogen but leave the helium and nitrog
176. rist strap part no 9300 0969 large or 9300 0970 small con nected to a suitable ground Failure to use a wrist strap may result in damage to the AED electronics 1 Shutdown the AED if still running 2 Unplug the power cord 3 Open the main cover 4 Always replace fuses F1 F2 and F3 F4 in pairs See also Troubleshooting the AC board on page 183 and AED does not turn ON on page 182 Released MAY 2000 G2350A AED Service Manual 74 Warning Electronics Maintenance High voltage power supply High voltage power supply High Voltage To reduce risk of electric shock disconnect the power cord from the AED To replace the high voltage power supply Always disconnect the power cord when changing the power supply on the AED 1 Turn off the AED and unplug the power cord 2 Ifthe shipping bracket is still installed remove its two mounting fasteners and remove the bracket 3 Attach the emission source to the water drawer and slide the drawer out as described in Moving the Cavity Assembly to the Source Position 4 Disconnect the power supply connector and ground wire from the emis sion source assembly and slide the drawer back into the AED Remove the power supply cable from P4 on the AC board Use a posi drive to remove the power supply mounting screw Figure 47 Removing power supply 7 Loosen do not remove the two 7 mm nuts which secure the fire wall and remove the fire wall 8 Liftthe
177. rotective insulation The transfer line does not present a burn hazard as long as this rigid insulation is in place The cavity assembly hardware is located under a hinged safety cover to pre vent burns Keep this cover closed until the cavity has reached ambient tem perature before performing maintenance procedures such as changing a column or replacing a discharge tube The water reservoir and water lines can reach high temperatures and can be accessed easily Be sure to turn OFF the AED and let the water cool before draining the system Released MAY 2000 G2350A AED Service Manual 58 Warning Warning Warning General Maintenance Hazard awareness High voltage To reduce risk of electric shock always disconnect the power cord when changing the fuse on the AED To reduce risk of electric shock the ground strap for the magnetron power supply must always be connected to the wave guide when the AED is in opera tion High voltage hazards include e The high voltage supply to the magnetron which delivers a current of 8 A at 2 2 V to the magnetron filament and 60 mA at 2340 V to the magnetron high voltage circuit e The 120 220 V supplies connected to the column transfer line heater the emission source heater the water bath heater and the 115 120 V circuits at the primary instrument supply Microwaves Microwave radiation Never remove the screws attaching the cavity to the wave guide or the screws which fasten
178. round any gas getter in the system Remake the column at the detector end and use a new ferrule Released MAY 2000 G2350A AED Service Manual 193 No plasma Gas Flow System Troubleshooting No plasma Problem Possible cause Suggested actions There is no plasma No high voltage from power supply No spark from sparker board Low water flow or pressure No helium Cavity emission source magnetron or transfer line heater or PRT faulty Emission source assembly not closed against the door open switch or the door closed switch is faulty Spectrometer grating motor is stuck or the switch is faulty Faulty cable or poor connection Pressure switch is faulty Emission source magnetron is not functioning See Troubleshooting the high voltage power supply on page 184 Replace the sparker board Check for carbon build up track on the 0 rings in the lens mount liner carbon track indicates a short Replace the O rings See Figure 151 Sparker board Check the flow sensor and pump See ow rate too low high on page 202 Replace the water filter Troubleshoot and if necessary replace the water board Check for 30 psig at the helium pressure gauge on the gas drawer front panel Check for leaks at the gas union Replace the O rings in the dis connect block Check for leaks in the gas drawer See Finding gas leaks on page 192 Check the heaters and PRTs for open or shorted circuits or obvious
179. rt up on page 41 and check for flow at the end of the line Replace the line if clogged Released MAY 2000 G2350A AED Service Manual 197 Gas Flow System Troubleshooting Solenoid will not operate column flow ferrule cavity vent vent Figure 137 Solenoids in de energized state Released MAY 2000 G2350A AED Service Manual 198 Troubleshooting the gas drawer Gas Flow System Troubleshooting Troubleshooting the gas drawer Problem Possible cause Suggested actions 0 60 psi gauge pinned 0 10 psi gauge working cavity vent flow is high The mass flow controller MFC does not work but the lens purge flow is acceptable There is a loud hiss if the nitrogen flow is On there are no flows and no pressure readings There is no cavity pressure the MFC has no effect but the lens purge is acceptable There is no lens purge flow there is no cavity pressure and the helium supply pressure is acceptable The 0 60 psi gauge works properly but the 0 10 psi gauge will not set The 0 60 psi gauge works properly but the 0 10 psi gauge will not set Tubing to the forward pressure regu lator is misplumbed Tubing to the MFC is misplumbed The nitrogen source is connected to the helium inlet or the internal plumb ing leading from the helium and nitro gen inlets are swapped The nitrogen gauge is misplumbed probably to the forward pressure reg ulator or to the 0 60 psi pressure gauge T
180. same as it was before filter replacement usually approximately 1 5 psi If your AED serial number is US03000208 Warning Effluent Gases To reduce risk of breathing ozone and other harmful gases pro duced by the plasma turn off all reagent gas flows and the column flow before starting this procedure Turnoffthe AED 2 Pullthe gas drawer out far enough to reach the filter See Accessing the gas drawer on page 109 Released MAY 2000 G2350A AED Service Manual 117 Gas Flow System Maintenance Gas drawer Figure 84 Replacing the fly ash filter 3 Remove teflon line to the cavity and to the solenoid valve 4 Replace the filter in its holder and connect the teflon lines to the cavity and solenoid valve Check that the arrow on the filter is against the direc tion of the flow Installing the filter backwards allows the user to easily see when the filter needs to be replaced 5 Turnonthe AED and check for gas leaks The cavity pressure gauge should read 1 5 psi Gas drawer Cavity pressure Fly ash filter Helium supply pressure Figure 85 Gas drawer Released MAY 2000 G2350A AED Service Manual 118 Gas Flow System Maintenance Gas drawer To replace the gas drawer as a module Warning Effluent Gases To reduce risk of breathing ozone and other harmful gases pro duced by the plasma turn off all reagent gas flows and the column flow before starting this procedure Hydrogen Gas To reduce
181. si drive Lift the board out of the AED and set aside Check the voltage selection switches on the new board and reset if appli cable See Table 14 below 8 Install the new board See also AC board on page 147 AED does not turn ON on page 182 Troubleshooting the AC board on page 183 AC board part no G2350 60057 on page 212 Released MAY 2000 G2350A AED Service Manual 72 Electronics Maintenance AC hoard Figure 45 AC board connectors Voltage selection switches When a new AC board is installed the voltage selection switches may need to be properly set before use Set the switches as follows Released MAY 2000 G2350A AED Service Manual 73 Warning Caution Electronics Maintenance AC board Table 14 Voltage Selection Switch Settings Country VAC 1 Setting S2 Setting Japan 100 down up USA 120 down down Europe 220 230 up up USA 240 up down Figure 46 Switch settings for USA 120V AC board shown installed Note The AC board is installed upside down The switch settings above are given for the installed orientation Up is toward the main board and Down is toward the bench top as installed in the AED Fuses Always try to determine the possible cause for a blown fuse before replacing the fuse High Voltage To reduce risk of electric shock disconnect the power cord from the AED The following steps require protection from electrostatic discharge ESD Use a grounded w
182. ssure gage gage 2 cavity pressure gage r1 to r17 pneumatic restrictors ferrule cavity vent vent Gas flow system Window purge Makeup gases gt Makeup Gases gt Column flow Makeup Gases gt Spectrometer window purge Gases All Gases Cavity flow detail solvent vent ON Figure 121 Gas flow system in calibration mode Released MAY 2000 G2350A AED Service Manual 163 Gas Flow System Theory of Operation Flow modes Reagent mode three reagents Description A small flow of reagent gas adds to the overall flow to the cavity e Solenoid s energized as described above plus any reagent s CH N e gt Total flow rate 5 to 10 mL min each 02 or 02 Helium H2 or H2 Helium He CH4 N2 or CH4 N2 helium Static or Exhaust Helium 02 Solenoid 51 off H2 Solenoid 52 ON CH4 N2 Solenoid S3 off Solvent Vent Solenoid S4 off High Flow Solenoid S5 off CH N column flow fpr forward pressure regulator mfc manual flow controler bpr back pressure regulator m1 main manifold block m2 secondary manifold block gage 1 helium head pressure gage gage 2 cavity pressure gage r1 to r17 pneumatic restrictors ferrule cavity vent vent Gas flow Window purge Makeup gases 4 gt Makeup Gases gt Column flow Makeup Gases gt Spectrometer window purge Gases All Gases Cavity flow detail Figure 122 Gas flow
183. ssure should read 1 5 psig and the helium supply pressure should read 30 psig Adjust the pressures as required Turn ON the ChemStation components in the order specified below e ALS e GC e AED e The computer running the GC AED ChemStation e peripherals e g printer The status of each instrument will appear in the Workstation 8 10 11 12 13 14 Wait for the self test to finish and the AED water system to start The plasma should light As soon as the plasma is lit immediately check for microwave leak age See Testing for Microwave Leakage If the stray microwave reading is above 5 mW cm at a distance of 5 cm turn OFF the instrument imme diately Carefully slide out the water drawer The emission source must be locked to the enclosure not to the drawer Check for water leaks If aleak is found turn OFF the AED Check that the discharge tube is not broken and that all fittings are tight See Water leaks on page 204 Check that the water level in the reservoir is just above the upper fitting Add distilled water if necessary Slide the water drawer in fully Open the ChemStation software From the Start menu select the Chem Station folder then the appropriate Instrument Online icon This will start the ChemStation Once the ChemStation is running it will load the last method used and the AED Real Time Spectral plot should be displayed If the AED Real Time Spectral Plot window is not displ
184. system connector Connector to main harness Pin Function 12 Not used 3 14 High flow solenoid 4 8 Solvent vent solenoid 5 9 Oxygen solenoid 6 10 Hydrogen solenoid 7 11 Auxiliary solenoid Voltage across the pins of a solenoid is 0 V normally 24 V when energized Released MAY 2000 G2350A AED Service Manual 219 Cabling Diagrams and Pinouts Heater sensor cable assembly part no G2350 61310 Heater sensor cable assembly part no G2350 61310 To transfer line To water system To main PCB J252 7 2 To emission source sense cable L V4 L ii To AC bd J7 NE m m ise To cavity p To AC bd P6 Figure 145 Heater sensor cable assembly Released MAY 2000 G2350A AED Service Manual 220 Connector to main board J252 PRT circuit Cabling Diagrams and Pinouts Heater sensor cable assembly part no G2350 61310 Pin Function J252 1 Cavity PRT J252 2 Cavity PRT GND s J252 3 Transfer line PRT J252 4 Transfer line GND s J252 5 Emission source safety switch J252 6 Emission source safety switch GND Connector to AC board J7 Pin Function cO OO N Cc A FP WO N gt e Transfer line heat Transfer line heat return Cavity heat Cavity heat return 120 VAC 120 VAC back Pump GND 24 V pump enable 24V DC H20 sense A senses open circuit in wiring Connector to AC board P6 Pin Function AeA o
185. t Turn the oxygen OFF from the ChemStation Released MAY 2000 G2350A AED Service Manual 45 Installation First start up Set the hydrogen pressure 10 Enter 486 nm as the wavelength and select the Go To bar 11 When the spectrometer arrives at 486 nm turn ON the hydrogen from the ChemStation 12 Measure the area of the hydrogen 486 line and record the value for use in step 14 13 Select the helium 492 line and measure its area Record the value for use in step 14 14 The ratio of the hydrogen 486 to helium 492 line areas should be 10 1 If the ratio is greater than 11 decrease the hydrogen pressure at the hydro gen regulator 15 Perform steps 12 through 14 until the ratio is correct 16 Turn the hydrogen OFF from the ChemStation Set the auxiliary gas CH4 N5 pressure 17 Set the AED auxiliary gas methane nitrogen or methane pressure to 30 psig 18 Turn ON the oxygen reagent gas from the ChemStation 19 Measure and record the area count value of the helium 492 line 20 Turn ON the AED auxiliary gas from the ChemStation 21 Measure and record the area count value of the hydrogen 486 line 22 The ratio of the hydrogen 486 to helium 492 line areas should be 3 3 0 2 Adjust the AED auxiliary gas pressure at the regulator until the hydrogen 486 to helium 492 area count ratio is correct Remeasure both area counts after each adjustment Prepare for performance verification 23 Turn OFF the reagen
186. t 8 A 4 A x 2 for scale When the main board verifies that all conditions are acceptable water flow water temperature heated zone temperatures inter locks etc the voltage in the high voltage enable wire drops to about 0 2 0 3 V and 60 mA at 2340 V AC flows from the power supply to the magnetron The high voltage circuit is a latched circuit If the circuit is ever over ener gized it must bleed off before the power supply will function properly This may take several minutes to several hours Released MAY 2000 G2350A AED Service Manual 154 Electronics Theory of Operation Service display board Service display board The service display board is an optional diagnostic tool available only to the Agilent Customer Engineer It can be plugged into P101 on the main board as a troubleshooting tool if the computer is either down or is not registering the AED self diagnostics at start up If the AED is operational the display board will show the results of the self diagnostics as it starts up Released MAY 2000 G2350A AED Service Manual 155 Emission Source Theory of Operation Emission source assembly Emission Source Waveguide Waveguide transformer A Magnetron n aT ES E paler o N Figure 115 Emission source Emission source assembly The AED magnetron generates an intense microwave field which is directed toward the cavity by the wave guide The microwave radi
187. t gases from the ChemStation These pressure setpoint values are a starting point for measurement and for performance verification as described below and may require additional adjustment after running the AED Checkout sample Verify initial spectrometer purge Allow the AED to purge for two hours to reach optimal spectrometer sensitiv ity in the UV range After sufficient purge time has passed check the spectrom eter purge flow as follows Released MAY 2000 G2350A AED Service Manual 46 Installation Verifying performance Enter 165 nm as the wavelength and select the Go To bar When the spectrometer reaches 165 nm select the carbon 165 line Measure the area and record the area count value Enter 193 nm as the wave length When the spectrometer reaches 193 nm select the carbon 193 line Measure the area and record the area count value TP 9X gg ome Calculate the area ratio of the carbon 193 to carbon 165 lines The ratio should be 4 or less If the ratio is greater than 4 wait at least 15 minutes then remeasure the carbon 165 and 193 lines and recalculate the ratio If the ratio still is greater than 4 e If the spectrometer purge is controlled through an EPC slightly increase the nitrogen flow rate Wait at least 15 minutes then re test e Check the quality purity of the nitrogen purge gas e Check the system for gas leaks See Finding Gas Leaks When the ratio is acceptable the AED is ready for performa
188. tamination in the AED Transfer line temperature not hot enough not con trolled to temperature set point or heater is defective SiO buildup in the discharge tube Check for column damage injection port leaks sample con tamination of injection port or column Clean and replace con taminated part Check the flow settings in the AED and the GC Reset the flows Different flow settings may yield better results Check the gas purity and the cleanliness of the plumbing Replace as required Check transfer line setpoint and reported temperatures Check the transfer line heater sensor for damage Adjust the setpoint or replace the heater sensor Replace the discharge tube EA Loss of UV sensitivity Problem Possible cause Suggested actions Loss of sensitivity in the UV Purity of spectrometer purge Verify nitrogen purge gas is of acceptable purity If the gas region Area ratio of the car gas is too low is apparently pure at the source check the spectrometer bon 193 and 165 lines is greater than 1 2 Seals at spectrometer con nections are loose and or leaking Spectrometer lens is dirty lens for cleanliness If the lens is clean change gas cylin ders and inspect the lines or change them to make sure no contaminants are within the purge system Verify that the inlet and outlet purge lines are secure and non leaking Check that the PDA is not loose and that the optical side chamber and lens assemblies are
189. tarting this procedure 1 If using a getter cool it to room temperature The getter must be at room temperature so that it will not react with the air when the gas line is opened 2 Ensure that the inside of the valve for the new tank is clean Remove any debris which can cause restrictions in the flow system Released MAY 2000 G2350A AED Service Manual 111 Gas Flow System Maintenance Column installation changing columns Disconnect the old cylinder and connect the new cylinder Open and close the tank valve then bleed the pressure out of the regula tor Repeat this five times Open the inlet fitting at the AED to bleed the gas through the line Filling the line with gas a little bit at a time and bleed ing the air out ensures that air will not diffuse back into the tank 5 Turn the gas cylinder on and use a thermal conductivity leak detector never use a water based soap solution such as snoop to check the tank fitting and the fitting retightened at the AED Dirty valves can be a source of leaks Debris can clog restrictors in the flow system If a leak exists a water based leak detector will create high hydrogen backgrounds Column installation changing columns To change the column in the GC AED follow the steps below Warning Wear safety glasses when performing this procedure Do not cut or abrade insulated surfaces If the insulation is flaky crumbly replace or seal the insulation Wear protective clothing ey
190. ter filter and tighten the clamps Released MAY 2000 G2350A AED Service Manual 137 Warning Caution Warning Water Flow System Maintenance Flow sensor Before re starting the AED make sure there is no water on the AED electron ics Remove water puddles and allow electronic surfaces to dry thoroughly Make sure no water is inside the cavity or purge vent tubing or the ash filter To avoid electrical shock make sure the spark plug wire is attached to the spark plug before starting the AED 8 Turn on the AED 9 Observe the water flow making sure there are no leaks Correct any leaks If there is a water leak quickly shut off the AED to avoid spilling water within the enclosure 10 Refill the reservoir with distilled water to just above the upper fitting See also Pump cycles very fast then slow on page 203 Flow sensor If your AED serial number is lt US01000166 only To replace the water flow sensor High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Turn off the AED and allow the water to cool 2 Lowerthe front facing 3 Remove the water drawer See Water drawer on page 133 4 Remove the water board panel and switch assembly from the drawer See Water board on page 130 5 Loosenthe water pump clamp and move the pump aside See Water Pump on pa
191. the column to the proper length as described in Column installation changing columns on page 112 2 For best results install the checkout column in the GC and purge for 20 to 30 minutes with helium before conditioning Set the GC column inlet pres sure inlet press change to 20 psi 3 Begin conditioning the column at 250 C for 1 to 2 hours Turn the AED ON and set the initial gas flow rates Microwaves When turning the instrument on for the first time after receipt check for microwave leakage immediately after the plasma ignites If stray microwave emission is above 5 mW cm at a distance of 5 cm shut down the instrument immediately and call the Agilent Technologies Service Department for service 1 Slide the conditioned column into the transfer line and tighten the column nut into the fitting Make sure that the white correction fluid mark is still visible See Column installation changing columns on page 112 2 Plugthe AED into the proper outlet See the label near the power cord receptacle on the back panel of the AED Lower the front facing Turn ON the supply and reagent gases at their sources Your source pres sure must be set as shown in Table 6 on page 17 and Table 7 on page 18 5 Allow time for the gas flow system to purge Released MAY 2000 G2350A AED Service Manual 41 Installation First start up Check the cavity pressure and the helium supply pressure on the gas drawer front panel The cavity pre
192. to the spark plug before starting the AED 8 Turn on AED 9 Observe the water flow making sure there are no leaks Correct any leaks Released MAY 2000 G2350A AED Service Manual 136 Water Flow System Maintenance Water filter Caution If there is a water leak quickly shut off the AED to avoid spilling water within the enclosure 10 Refill the reservoir with distilled water to just above the upper fitting See also Pump cycles very fast then slow on page 208 If your AED serial number is gt US01000166 To replace the water filter Warning High Temperature Before touching the GC AED column transfer line cavity assembly or water reservoir turn off the instrument Allow it to cool to ambi ent temperature or wear heat resistant gloves 1 Turn off the instrument Allow the water to cool Slide the water drawer out Remove the two clamps and hoses leading into the water filter See Figure 104 4 Note the orientation of the outlet connectors on the filter Unscrew the water filter hose clamp and remove the water filter Remove hose and clamp Remove hose and clamp Figure 104 Removing the water filter 5 Replace the water filter in the hose clamp and orient the outlet connectors as shown in Figure 104 Caution The water filter must be oriented so that the outermost outlet fitting is at the vertical or topmost position 6 Retighten the hose clamp 7 Replace the hoses onto the wa
193. top of the assembly 1 o clock position Place the lens mount nut over the lens mount bottom with the threads fac ing out Install the lens mount top so that the pin in the lens mount bottom fits in the hole in the lens mount top Install the lens in the lens keeper assembly then install the lens keeper using three screws Be sure the O ring is secure and undamaged Tighten the screws a little at a time until all are tight and follow a circular tighten ing pattern The tightening pattern is important for sealing Remove the two mounting screws in the PDA window cover and remove the cover Install the PDA onto the spectrometer making sure the alignment slot is aligned Install the spectrometer into the cradle with four screws Install into AED and slide back Install the lens mount liner assembly and the spark plug to keep the assem bly in place and to ensure proper alignment of the through holes in the liner with the cutouts in the water chamber See Figure 38 on page 64 Put alight coat of Hi Vac grease or equivalent lubricant on the bottom inte rior flange of the lens mount nut Released MAY 2000 G2350A AED Service Manual 66 Warning Optical Assembly Maintenance Spectrometer assembly 31 Slide the water drawer back into the AED and lock the emission source to the enclosure 32 Install the spectrometer assembly onto the optical side water chamber and hand tighten the lens mount nut onto the threads 33 Re
194. up or not transmitting start up Bad cabling power cord jump ers from AC board jumpers from main board jumpers from high voltage power supply Check the fuses on the AC board Replace if needed See Troubleshooting the AC board on page 183 and Figure 132 AC board Check main board fuses at F500 and F501 Replace if needed Check test points on main board 5 V 2 15 V 15 V 24 V GND 24 V Replace the main board See Figure 133 Main board Check cable continuity Replace if necessary See Figure 139 G2350A internal cabling diagram Released MAY 2000 G2350A AED Service Manual 182 Electronics Troubleshooting Troubleshooting the AC board Troubleshooting the AC board Once a problem has been isolated to the AC board replace the board and re test To troubleshoot the AC board 1 Check the fuses FAIF2 Transformer FSIFA High voltage power supply F5 Heaters Replace fuses F1 F2 and F3 F4 in pairs 2 Ifall heated zones are out the problem is either a cable or the AC board Verify that the heaters and the PRTs are operating properly See also Zone is not heating on page 187 If the heaters are not shorted out replace the AC board 3 If fuses F1 F2 and F5 have blown replace them and check the heaters to verify they are not damaged or shorted Figure 132 AC board Troubleshooting the main board 1 Check the fuses on the main board F500 40 VAC F501 40 VAC Released MAY 2000
195. ut should not reach zero Re measure the purge flow rate The flow rate should be from 30 to 35 mL min If necessary adjust the cavity pressure until the flow rate is between 30 to 35 mL min Released MAY 2000 G2350A AED Service Manual 43 Installation First start up 19 Move the flow meter to the cavity vent Adjust the makeup flow until a flow rate of 60 to 70 mL min is obtained 20 Re measure the purge vent flow rate The flow rate should be approxi mately 40 to 45 mL min 21 The cavity vent flow rate should equal the purge vent flow rate 30 mL min 5 mL min If necessary adjust the cavity pressure until the cavity vent flow is within the acceptable range 22 Cycle the reagent solenoid valves ON and OFF while monitoring the purge vent flow rate The flow rate should remain relatively constant After the initial flow rates are established you will need to verify spectrometer performance and correct the reagent gas flow rates obtain optimal default sensitivity for performance verification Refer to Adjust EPC controlled reagent gas flow rates 6890 only on page 44 and or Adjust manually con trolled reagent gas flow rates on page 45 below to adjust any EPC controlled and or manually controlled reagent gas flow rates Adjust EPC controlled reagent gas flow rates 6890 only If you have any reagent gas flows controlled using EPC you can check and cor rect their flow rates automatically using a macro described
196. ve the two mounting screws which secure the water board panel in the drawer and remove the board and panel Released MAY 2000 G2350A AED Service Manual 132 Warning Warning Water Flow System Maintenance Water drawer Remove the screws Figure 99 Board panel removal Remove the five board mounting screws and remove the board from the panel Do not operate the AED with the water drawer open See also Water board on page 153 Water Flow System on page 170 Water board part no G2350 60080 on page 237 Water board part no G2350 60085 on page 239 Water drawer To replace the water drawer High Voltage To reduce risk of electric shock disconnect the power cord from the AED 1 Power down the AED and allow the water to cool 2 Pullthelower AED door down and open the front lid 3 Disconnect the inlet and outlet tubing at the cavity Connect the ends together or plug them to avoid leaks Leave the tubing connected at the water module 4 Slide the water drawer out Released MAY 2000 G2350A AED Service Manual 133 Water Flow System Maintenance Water drawer 5 Disconnect the heater sensor cable assembly Heaterisensor cable assembly Figure 100 Heater sensor cable assembly serial number US01000166 drawer shown 6 Pushthe tabs in the slide and on the bottom of the water drawer slides and remove the drawer from the rails Figure 101 Water drawer locking tabs 7 I
197. wipe to remove glass particles stuck to the chamber surface See Figure 56 Released MAY 2000 G2350A AED Service Manual 88 Emission Source Maintenance Cleaning the cavity Dry these surfaces Figure 56 Drying the GC side water chamber 8 10 11 12 13 Using the small brush clean the through hole in the GC side water cham ber Use clean compressed air to dry the O ring seat and clean out the dis charge tube through hole Re install the O ring If the O ring is damaged replace it Remove the optical side water chamber from the cavity Remove the old discharge tube O ring from the tip of the exit cone in the chamber Use clean compressed air to blow any water and particles out of the O ring groove and off of the faces of the chamber Do not remove the O ring set inside the optical side water chamber If necessary use a Kimwipe to remove glass particles stuck to the surface Using the small brush clean the through hole in the chamber Use clean compressed air to dry the chamber and clean out the discharge tube through hole in the water jacket Clean the discharge tube through hole in the cavity using the small clean ing brush Use clean compressed air to blow any particles of debris from the through hole Released MAY 2000 G2350A AED Service Manual 89 Caution Warning Emission Source Maintenance Cleaning the cavity 14 Reassemble the cavity Hold the GC side and optical s
198. y ensure that the hydrogen gas flow is turned off at the source and in the AED before starting this procedure Effluent Gases To reduce risk of breathing ozone and other harmful gases pro duced by the plasma vent G2350A AED effluents from the side panel to a fume hood Turnoffthe AED 2 Turn off the column flow Reduce the GC oven temperature to less than Released MAY 2000 G2350A AED Service Manual 109 Gas Flow System Maintenance Accessing the gas drawer 40 C Turn off all reagent flows at the AED and the source s Oxygen islot Outlets Vent Bypass f I I fr d th Cavity Helium m Vent Figure 76 Screw location 3 Remove the mounting screw in the enclosure at the lower left foot of the drawer Remove the mounting screw on the right side of the drawer and just past the gas ports 4 Slidethe drawer partially out If needed slide the tubing from the gas union disconnect block out of the guide channel 5 Labelthe five gas lines leading into the drawer and label the correspond ing connections inside the drawer 6 Usetwo 5 16 inch open end wrenches to disconnect the Swagelok fittings from the disconnect block tubing If necessary remove the drawer fully 1 Turn off the helium and nitrogen flows at the source label all inlet and out let lines and then remove the lines Plug the inlet lines from the sources to prevent contamination 2 Usea9 16
199. y there is a leak in the gas drawer Check the placement and condition of the O rings in the lens mount liner beneath the purge inlet cavity vent and spark plug Check for a ferrule under the purge and cavity vent lines Install replace the O rings or ferrule as needed Check the cavity and ferrule purge lines for leaks Check the fly ash filter Check that the gas union is tight If the leak persists remove the transfer line and plug the open gas union end Disassemble the cavity assembly remove the discharge tube and check all O rings for placement and damage Replace O rings as needed and reassemble If the leak persists dis assemble the lens mount assembly check the O rings and reassemble If the leak persists check the pressure gauge See also Figure 135 Gas flow systems in basic operation flow mode Plasma glows brown Problem Possible cause Suggested actions Plasma glows brown not Dirt on the outside of the discharge Empty all the water from the AED and replace with white tube due to fresh distilled water Clean the cavity and replace the Residual cutting solution from discharge tube Make sure that the cooling water is dis machining tilled and pure Use of de ionized water Released MAY 2000 G2350A AED Service Manual 195 Gas Flow System Troubleshooting Plasma glows red Solenoid will not operate Plasma glows red Problem Possible cause Suggested actions Plasma glows red not Hydrogen
200. y not open 2 PRT safety circuit normally not open Released MAY 2000 G2350A AED Service Manual 232 Cabling Diagrams and Pinouts PDA to main PCB cahle assembly part no G2350 60860 PDA to main PCB cable assembly part no G2350 60860 Red indentifies pin 1 Pin 1 Figure 149 PDA to main PCB cable assembly Connector J151 PDA to main board Pin Function Pin Function Pin X Function 1 GND 15 CAL2 29 PH2 2 PGA OUT 16 GND 30 X GND 3 GND 17 31 PHI 4 GND 18 GND 32 GND 5 CAL REF 19 33 ASUB 6 15 20 GND 34 GND 7 15 21 GAIN2 35 RESO 8 15 22 GND 36 GND 9 15 23 37 RESF 10 15 24 GND 38 11 15 25 GAINO 39 HBW 12 GND 26 GND 40 GND 13 27 STIRT 14 GND 28 GND Released MAY 2000 G2350A AED Service Manual 233 Cabling Diagrams and Pinouts Service display board cable part no 05921 60710 Service display board cable part no 05921 60710 Connects to P101 on the main board and to the display LED PC board assem bly part no 05921 60020 Sparker assembly cable part no 05921 61000 Blue Red Brown Yellow Yellow Red sie d c Brown Blue White Figure 150 Sparker assembly cable Connector to J2 Pin Function 1 13 6 V coil 2 13 6 V module 3 5 V module

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