Teledyne HFM-60 Automobile Parts User Manual
Contents
1. 2 5 1 8 1 See 538 10 8 8 21 21910 YOLSINNSHL 1900 91 WIXV O Wdd 000 110 1020 6 zy 9041 NS 10 874 18 82 OINOSYNVd 4L LYM 8 1 189 7534 09710 8 01 3E 9071 WS 729 54 38 ONOSYNYd 1 8 976 534 9 10 8 9001 WS 0014 38 83 OINOSWNYd 1 LYM 8 1 308 538 10 8 9021 NS 717274 38 83 OINOSVNVd 7 1 8 1 538 677 10 8 ZIN OL 9021 WS AIZOLAN38 H3 OINOSYNYd 1 8 20071 SAA 477 10 8 vl 64 994 5 3015 449005 7 1 082 104 1 1 20 6 Gl 01 1 994 5 5 3015 17 1 301104 7 0 90 6 91 2601 71 lt 1 9385 93 LIOA 860 40 95 11 an cn in 01 71 101 POV 504 944 110A 9 0 0 96 81 0011919323 AMOS JMOL d1 AYY Y19313 WOW 041 80 11 6 99212 80622 WS HGOLXALL SI3 97 WN IWINVIL 8 1 420 1 04 112701262827262 2 2 902122 WS MEYPOLHLA NOF OINVYSO dyo 821 80 1 8 SN 8 9105 4 90 0 dNY dO 100 40 95 GE G3TIVISNI LON FEV IM 18 4355 ONINNG 03140 5 30105 LON 38 1 SY3dANNP 1 3 054172 50 0 1 5 2 55 19 019 V Odl HILIM NI SGYVOS 365 5410 AISWASSV 3103 742 20 10 0 009197 2513 4 030551 5 2 SOOT2. any position as long as the direction of gas flow through the instrument follows the arrow marked on the bottom of the flowmeter case label T he preferred orientation is with the inlet and outlet fittings in a horizontal plane C hanging the mounting orientation requires re zeroing of the instrument at zero flow he smallest of the internal passageways in the H F M 60 is the diameter of the sensor tube which is 0 020 and the annular clearance for the 500 sccm shunt which is 0 009 so the instrument requires adequate filtering of the gas supply to prevent blockage or clogging of the tube T he screen diffusers assist in filtering to some extent where the filter mesh is as small as 0 010 page 9 page 10 T here is threaded hole the bottom of the transducer that can be used to secure it to mount ing bracket if desired Other holes for special mounting can be added to the end cap as desired hestandard inlet and outlet fittings for the 60 are1 4 N PT to 1 4 Swagelok optional VCR andVCO fittings are available from the factory he O rings for the end and the sensor are BunaN optional alrez eopreneorViton O rings are available from the factory It is suggested that all connections be checked for leaks after installation T his can be done by pressuriz ing the instrument do not exceed 150 psig unless the flowmeter is specifically rated for higher pressures and applying a diluted soap solution to
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4. TELEDYNE HASTINGS INSTRUMENTS MODEL HFM 60 FLOWMETER AGRE TELEDYNE INSTRUMENTS 59 9001 Hastings Instruments KEMA su 2 01 Teledyne Technologies Company Manual Print History heprint history shown below lists the printing dates of all revisions and addenda created for this manual T herevision level letter increases alphabetically as the manual undergoes subsequent updates A ddenda which are released between revisions contain important change information that the user should incorporate immediately into the manual Addenda are numbered sequentially W hen anew revision is created all addenda associated with the previous revision of the manual are incorporated into the new revision of the manual Each new revision includes a revised copy of this print history page Revision Document umber 143 042000 April 2000 Revision 0 umber 143 102002 October 2002 Revision Document umber 143 082005 August 2005 Visit www teledyne hi com for WEEE disposal guidance H astings Instruments reserves the right to change or modify the design of its equipment without any obligation to provide notification of change or intent to change Table of Contents 1 0 14 12 13 14 15 1 6 2 0 21 2 2
5. 0 50 C non condensing environment Temperature coefficient acii 1000 ppm C typical 2000 ppm C max Temperature coefficient span 500 ppm C typical 1000 ppm C max 1x10 std cc s Standard 5 a aa 10 20 50 100 200 500 sccm 1 2 5 10 20 40 70 slpm Standard Ride akira end 0 5VDC Optional a 4 20mA BOWE eat 15 to 25VDC lt 60 0 5 output 15 to 25V DC lt 80 mA 4 20 mA output Wetted 6061 304L stainless steel nylon 400 Pb40Sn solder Cu30Zn brass 40 to 60 slpm units and epoxy in 10 to 200 sccm units 13 Optional 4 20mA Current Output option to the standard 0 5VDC output isthe 4 20 mA current output that is proportional to flow T he 4 20 mA signal is produced from the0 5VDC output of the flowmeter he current loop output is useful for remote applications where pickup noise could substantially affect the stability of the voltage output T heload impedance should be between 0 and 400 Q 14 Digital Display 0 90 Tiltable 1 4 1 Local Display For real time indication of the flow rate a very useful option available
6. and flow reference outputs for flow rates of 20 40 60 80 and 100 and make sure data are within 3 of full scale flow Zero figure 4 1 page 18 44 EndCap Removal heend cap the inlet side must be removed to gain access to the filter and shunt assembly First remove power and shut off the supply of gas to the instrument Disconnect the Swagelok fittings on the inlet and outlet sides of the transducer remove it from the system plumbing Remove the two Allen head screws holding the end to the instrument see figure 4 2 fully remove the end cap retaining ring filter spacer filter washer and ball bearing if present and shunt noting their order and proper orientation T heshunt can be severely damaged if dropped Examine the filter and shunt If either is damaged dirty or blocked clean and replace as applicable Reassemble the reverse order of disassembly Secure the with 4 Ib of torque each 18 8 stainless steel socket head cap screw U se of a fastener other than the one mentioned here may result in leakage at the seal Recalibration of the 60 is necessary 10 sccm to 200 sccm figure 4 2 page 19 45 Printed Circuit Board Replacement the event that any of the PC boards fail they are easily removed from the instrument and replaced with a spare his ease in disassembly and replacement substantially reduces instrument downtim
7. contains service calibration information Some portions of the instrument are delicate U se extreme care when servicing the instrument he potentiometer positions and the electrical components referred to in the troubleshooting section can be found in Section 4 3 on the electrical component layout drawing cover 3 3 3 5 5 5 2 5 2 shunt plug 60 sIm shown end cap tubes coarse screen figure 3 4 page 16 SECTION 4 41 Authorized Maintenance W ith proper carein installation and use the flowmeter will require little or no maintenance If maintenance does become necessary most of the instrument be cleaned or repaired the field Some procedures may require recalibration D not attempt these procedures unless facilities are available Entry into the sensor or tampering with the printed circuit board will void warranty Do not perform repairs on these assemblies while the unit is still under warranty 42 Troubleshooting Symptom ause Action Symptom ause Action Symptom ause Action Symptom ause Action Symptom C ause Action Output reads strong indication of flow with no flow present Zero pot has no effect Power shorted out Unplug power supply for afew seconds then plug it back in If this is ineffective disconnect th
8. flow which is proportional to the total flow through the instrument he sensor develops differential voltage output signal proportional to flow which is approximately 1 mV full scale magnitude A differential amplifier and an inverting amplifier boost the signal strength by a factor of 5000 at full scale flow he amplified output be measured on pins and 4 of the external connector If aH astings power supply is employed the 5 volt output is also sent to the terminals on the back and to the decoding circuitry in the display which converts it to and 1 2 digit output An optional 4 20 mA analog output on pins and 4 is also available in lieu of an output voltage he addition of a 4 20 mA current loop transmitter on the secondary pc board mounted parallel to the main pc board is required to provide this current loop A jumper change is made the main PC board to establish the selected output mode T he digital display option includes the tiltable_L display module which is removable for remote display his separate module contains its own pc board and mounts directly on the top of the main cover T his local or remote digital unit provides a continual digital display in addition to the 0 5 or 4 20 mA output A standard 4 conductor phone jack cable is used to connect the display module to the main pc board he circuit diagrams for the aforementioned functions are presented in Section 6 his section
9. is 3 5 digit LCD digital display module mounted directly on top of the flowmeter case he display can be rotated 90 from the horizontal position to the fully vertical for better visibility he digits are large and clear and be easily discerned at distances of 20 feet 1 4 2 RemoteDisplay hetiltable display module may be removed from the flowmeter case and mounted at any distance away from the flowmeter body to permit convenient observation Standard lengths of 7 15 and 25 cable also special orders of any desired length are available 15 Wall Transformer Power Supply he input voltage required for operation of the flowmeter is 15 to 25VDC at a maximum of 60 mA 80 mA for the 4 20 mA output option 115VAC wall power supply rectified to 18 5 VDC is available as a power supply option he wall power supply comes with a 6 length of 2 conductor cable which be connected directly to the F M 60 connector L6 Other Accessories L6 1Totalizer AT R 1J he H astings F lowT otalizer integrates the 0 5 DC signal generated by the flowmeter to give total flow reading C ount rates from 0 to 999 counts per minute are selectable by internal setting 1 6 2 Hastings Model 400 200 40 10 Power Supply astings power supplies other than the aforementioned wall transformer are available either one two or four channel versions T hey convert 115 or 230VAC to the 15VDC required to operate the
10. 2 3 2 4 2 5 2 6 31 3 2 3 3 3 4 3 5 4 0 4 1 4 2 4 3 4 4 4 5 4 6 5 0 5 1 5 2 6 0 GENERAL 5555 5 PCa GS 5 6 Optional 4 20 MA Current O oe cece eee eter te teense 7 Digital Display 90 7 Wall T ranstormer Power Supply 2 25252227 7 Other A CCOSSONGS a 7 INSTALLATION a a a 9 RECEIVING aa 9 Power Requirements 9 9 echanical C a 9 Electrical ONMGCHONS 10 Operation te Wc pains 11 THEORY GE OPERATION 13 Overall Functional 13 13 14 SHUNE 14 sipanaro 16 MAINTENANCE aaa aa 17 Authorized M AMtek nensaha aa a 17 Troubleshooting 17 AGJUSIMOINS 18 E
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12. A hen gas should have a total flow of 0 65 50 32 5 splm gas should have a total flow of 0 15 50 7 5 and gas should havea total flow of 0 20 50 10 splm Further let us say that flowmeter has a 0 60 slpm range flowmeter has a 10 slpm range and flowmeter has 40 slpm range Since all flowmeters have 0 5VDC out then flowmeter A should be set to read 5 60 A 32 5 or A 2 71 volts flowmeter should be set to read5 10 B 7 5 or 3 75 volts and flowmeter should be set to read 5 40 C 10 or 1 25 volt Ideally however flow controllers are a far better way to accomplish the blending simply because there are no problems with pressure fluctuations 2 6 4 RangeC hanges he range of the flowmeter can be changed in the field if recalibration facilities are available he flowmeter may require a different shunt which can be purchased from the factory A listing of available shunts order codes and the corresponding air equivalent flow ranges are as follows Order Code Shunt Range Order Code Shunt Range 01 0 10 sccm 07 0 1slpm 02 0 20 sccm 08 0 2 slom 03 0 50 sccm 09 0 5 slom 04 0 100 sccm 10 0 10 05 0 200 sccm 11 0 20 slom 06 0 500 sccm 12 0 40 slom 13 0 70 slom Gases other than air or nitrogen have different properties and the range of each shunt will be different than those listed in the order codes above he flow rate of interest determines the size of the shunt require
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15. d As previously indicated 13 separate shunts are required for the range of flow spanning 10 sccm to 70 slpm full scale For the 200 sccm flow range four M onel 400 tubes of 0 027 i d arelocated within the aluminum shunt plug to accommodate the full 200 sccm L ower flow rates require proportionally fewer tubes and the unused holes sealed with epoxy or selected eutectic solder if epoxy is undesired A single 304L stainless steel plug with an annular spacing of 0 009 with the base accommodates the 500 sccm flow range Increasing the flow requires more annular passageways which is accomplished by adding concentric cylinder shells with increasing gap dimensions Eventually maximum annular gap dimension for laminar flow is obtained 0 030 For a maximum flow rate of 60 slpm three annular regions using two brass concentric cylinders is required To change ranges anew shunt must be installed a calibration conducted to do further measurements 2 6 5 Spanning the Digital Display exchange of shunt requires resetting of the digital display Ideally the flow should be estab lished to the full scale level consistent with the selected shunt and the display pot adjusted for that full scale flow rate Itis also possible to disconnect the phone jack connector to the main body and input 5 00VDC and set the display consistent with the particular full scale flow for the selected shunt Verify the full scale voltage current output and adjus
16. e 1 Replacement of the 4 20 mA option PC board Unplug the power cable from the transducer If adigital display exists unplug the phonejack connection and removethe flowmeter cover Remove the 4 brass spacers and lift off the 4 20 mA board Be careful not to damage the main board and 4 20 mA board connector 2 Replacement of the main PC board Continue from 1 Remove the 4 brass spacers from the main board and gently lift the board from the flowmeter base W hen installing the replacement board insure that the brass spacers are uniformly and securely tightened finger tight since the compression seals the O rings on the base PC board and the sensor tube which in turn maintains the integrity of the flow in the sensor 4 6 Sensor Replacement T hesensor is an intimate part of the main PC board and can not be separately removed from the main board without great difficulty T herefore sensor replacement requires the replacement of the entire main board Follow instructions for removing the main board as shown in Section 4 5 and consult Section 5 to acquire a new main board sensor unit page 20 SECTION 5 Warranty and Repair 5 1Warranty Repair Policy 6 Instruments warrants this product for a period of one year from the date of shipment to be free from defects in material and workmanship T his warranty does not apply to defects or failures resulting from unauthorized modification misuse or mishandling of the product T h
17. e Flowmeter is out of calibration and non linear Leaks in the gas inlet or outlet fittings Check all fittings for leaks by placing soap solution on all fittings between gas supply and final destination of gas C heck flowmeter for leaks R eplace O ringsif required recalibrate as necessary page 17 43 Adjustments Calibration Procedure Seefigure4 1 1 Connect power to pins 1 and 2 as specified in Section 2 5 Allow theinstrument to warm up for 30 minutes with 10 flow 2 Completely shut off the flow and wait for 2 minutes F or thestandard 0 5VDC output adjust the zero potentiometer located on the lower outlet side of the flowmeter until the meter indicates zero For the optional 4 20 mA output adjust the zero potentiometer so that the meter indicates slightly more than 4 mA i e 4 03 to 4 05 mA T his slight positive adjustment ensures that the 4 20 mA transmitter is not in its cut off region T he error induced by this adjustment is approximately 0 3 of full scale 3 Turn gas supply to inlet of instrument and insure the flow rate is an accurate maximum flow for the shunt employed Ensure that the full range can still be obtained at minimum inlet pressure 4 Adjust Span pot until the flow reference reads full scale 5 00V D 20 mA Perform this step only if a calibrated reference flowmeter is available 5 Adjust the span pot of the display so that it reads correct full scale flow 6 Record flowmeter
18. e power supply from the unit and check the power supply voltage 15 to 25 VDC 1 Output of flowmeter is proportional to flow but extremely small and not correctable by span pot Sensor is not being heated Shut off gas supply and disconnect the power to the flowmeter Remove cover and pc board from unit Check the resistance between w1 and w2 on 844 refer to figures in section of the flowmeter he resistance should be approximately 560 W he resistance between w3 w4 should be approximately 2 3W If not the sensor unit needs to be replaced Sensor has proper resistance readings but little or no output with flow Plugged sensor Shut off gas supply and disconnect the power to the flowmeter Remove cover and pc board from unit If sensor has evidence of clogging clean or replace as applicable Flowmeter reads other than 0 00VDC with no flow or there is a small flow when the flowmeter reads 0 00 Zero potis out of adjustment Shut off all flow For the standard 0 5V output adjust the zero potentiometer located on the lower outlet side of the flowmeter until the meter indicates zero For the optional 4 20 mA output adjust the zero potentiometer so that the meter indicates slightly more than 4 mA i e 4 03 to 4 05 mA his slight positive adjustment ensures that the 4 20 mA transmitter is notin its cut off region T he error induced by this adjustment is approximately 0 3 of full scal
19. e shifts result in some zero offset 2 6 2 Zero Check Connect the wall transformer power supply to the instrument or if using astings power supply turn the power supply on Allow approximately 10 flow for 1 2 hour warm up Stop all flow through the instrument and wait 2 minutes Caution Do not assume that all metering valves completely shut off the flow Even aslight leakage will cause an indication on the meter and an apparent zero shift For the standard 0 5VDC output adjust the zero potentiometer located on the lower outlet side of the flowmeter until the meter indicates zero For the optional 4 20 mA output adjust the zero potentiometer so that the meter indicates slightly more than 4 mA i e 4 03 to 4 05 mA his slight positive adjustment ensures that the 4 20 mA current loop transmitter is notin its cut off region he error induced by this adjustment is approximatly 0 3 of full scale his zero should be checked periodically during normal operation Zero adjustment is required if thereisa changein ambient temperature vertical orientation of the flowmeter or a change input voltage 2 6 3 Blending of Gases If more than one flowmeter is used to mix gases and each is calibrated for a given gas a desired mixture of the gases can be achieved Asan example suppose total flow rate of 50 slpm of gases A B C is required 15 of the total flow should be gas 20 of the total flow should be gas and the balance is gas
20. er supply cables etc O ptional equipment or accessories will be listed separately on the packing list T here may also be oneor more OPT options the packing list hese normally refer to special ranges or special gas calibrations T hey may also refer to special helium leak tests high pressure tests or special modifi cations such as high temperature O ring materials most cases these are not separate parts but special options or modifications built into the flowmeter 22 Power Requirements T he H FM 60 requires 15 to 25VDC 60mA 0 5 output 80mA 4 20mA output he supply voltage should be regulated such that there more than 50 mV ripple Surge suppres sors are recommended to prevent power spikes reaching the instrument hese power require ments are satisfied by the astings wall transformer by the astings wall power supply described in Section 1 6 1 or 1 6 2 23 Output Signal he standard output of the flowmeter is 0 5V signal proportional to the flow rate he input power is applied at pins 1 15 to 25VDC and 2 ground T he output is obtained on pins 3 0 to 5VDC and 4 common of the 4 pin connector It is recommended that the load resistance be no less that 2 When the 4 20 mA option see Section 1 3 is selected the output is also on pins and 4 he load impedance must be greater than 400 24 Mechanical Connections T he flowmeter may be mounted
21. flowmeter Interface terminals for the 15V DC input and the 0 5V DC linear output signal are located the rear of the panel Also cable be supplied with the power supply that provides the 15VDC pin 11 of a D connector and the 0 5VDC output measurement 6 Pins5 and 12 arecommon and pin 7 is chassis ground hroughout this manual when reference is made to a power supply it is assumed the customer is using a astings wall power supply or aM odel 200 400 40 10 supply page 7 page 8 SECTION 2 I nstallation T his section contains the necessary steps to assist getting new flowmeter in operation as quickly and easily as possible Please read the following thoroughly before attempting to install the instru ment WARNING T he customer should determine if their process gas is compatible with the wetted materials of the flowmeter as specified in section 1 2 Some corrosivegases may damage the flowmeter materials and elastomer O ring This could result in incorrect flow measurement or leakage over time 21 Receivingand Inspection Carefully unpack the astings F M 60 and any accessories that have also been ordered Inspect for any obvious signs of damage to the shipment Immediately advise the carrier who delivered the shipment if any damage is suspected C heck each component shipped with the packing list Insure that all parts are present i e flowmeter wall transformer pow
22. fore returning any product repair TELEDYNE HASTINGS INSTRUMENTS 804 NEWCOMBE AVENUE HAMPTON VIRGINIA 23669 U S A ATTENTION REPAIR DEPARTMENT TELEPHONE 757 723 6531 1 800 950 2468 757 723 3925 EMAIL hastings instruments teledyne com INTERNET ADDRESS hitp www hastings instcom Repair orms may be obtained from the Information R equest section of the H astings Instruments web site page 21 22 SECTION 6 Diagrams and Drawings page 23 4 LZ 0 l 6 1 0 Lo 8 god sju wnsu RY JNON 76 1 XITIN TX 0 AIGINASSV INAGA 131 War A3 OMG 325 31 25 11 51414 438 91216 GHVOG 03H913 3HV 8 26 893d 27 8 0 924 1 ET EI 010122 rONLOLNFHOT VIVYNWN HNOOL SYOLONG 990 10 G d 9 515 26 ODIM 8415 SOd 090 70 9 26 1057111 45 8 530010 145 8 ONIHOLMS 03345 HOIH 1939 1121 10 52 101 21 41 YSLYSANI SOVIIOA 901 40 95 944 9021 WS 142 38 81 2 05 1 8 Me 534 24 10 8 9 gt 9041 WS AL 9ZAN38 H3 2 05 4 1 8 21972 534 187 10 8 2 YY 9021 WS 002724 48
23. is warranty does not apply to batteries or other expendable parts nor to damage caused by leaking batteries or any similar occurrence T his warranty does not apply to any instrument which has had tamper seal removed or broken T his warranty isin lieu of all other warranties expressed or implied including any implied warranty as to fitness for a particular use Hastings Instruments shall not be liable for any indirect or consequential damages Hastings Instruments will at its option repair replace or refund the selling price of the product if astings Instruments determines in good faith that it is defective materials or workmanship during the warranty period D efective instruments should be returned to astings Instruments shipment prepaid together with a written statement of the problem and aR eturn M aterial Authorization RM A number Please consult the factory for your A number before returning any product for repair Collect freight will not be accepted 5 2 Non Warranty Repair Policy Any product returned for anon warranty repair must be accompanied by a purchase order RM A form and a written description of the problem with the instrument If the repair cost is higher you will be contacted for authorization before we proceed with any repairs If you then choose not to have the product repaired minimum will be charged to cover the processing and inspection Please consult the factory for yourRM A number be
24. lication of a multiplication factor to the air calibra tion to account for the difference in heat capacity he flowmeter is capable of measuring a wide range of gases T he M onel 400 sensor tube has an internal diameter of 0 0205 and is heated by 600W of W S 800 wire his diameter allows approximately 10 sccm full scale flow with Ap of 0 5 inches of he sensor is encapsulated by a plastic cover and filled with fiberglass insulation to minimize convective heat losses page 13 14 5 9 13 3 H L 2 0 L 2 Length of tube figure 3 2 Base he 6061 aluminum alloy base has a 1 square cross section and is 3 375 long with end heinternal flow channel is 0 812 diameter with in out 304L stainless steel fittings 1 4 PT to 1 4 Swagelok fittings 34 Shunt he flow rate of interest determines the size of the shunt required As previously indicated 13 separate shunts are required for the range of flow spanning 10 sccm to 70 slpm full scale T he geometry of the shunt for 0 200 sccm is shown in figure 3 3 a Four 400 tubes of 0 027 i d arelocated within the aluminum plug to accommodate the full 200 sccm ower flow rates require proportionally fewer tubes and the unused holes are sealed with epoxy or selected eutectic solder if epoxy is undesired At the lowest flow rate 10 sccm the shunt is completely blocked and all of the flow is routed through the senso
25. nd Cap REMOVAL seetan hana a 19 Printed Circuit Board 20 Sensor Replacement 20 WARRANTY AND REPAIR sess 21 a a 21 Nion Warranty Repair POE 21 DIAGRAMS AND DRAWINGS wisicscnstonsisnaticsnavanesnntiennnssanssinaeannnscasnves 23 SECTION 1 General Information T heH astings M ass F lowmeter H F M 60 is designed to accurately measure mass flow up to 70 slpm with an accuracy of better than 3 astings mass flow instruments do not require periodic maintenance under normal operating conditions with clean gases N o damage will occur from the use of moderate overpressures 150 psi or overflows Calibrations for other gases such as oxygen helium and argon are available upon special order Instruments are normally calibrated with the appropriate standard calibration gas nitrogen then acorrection factor is used to adjust the output for the intended gas 11 Features heHFM 60 isintrinsically linear Should recalibration calibration standard is required in thefield bedesired the customer needs to simply set the zero and span points he HFM 60 incorporates removable replaceable main board sensor module which virtually eliminates long down time due to clogging C logging is the most common cause of failure the industry he 60 sensor is less likely to be clogged d
26. ouples and and provides an analog output of either 0 5VDC or 4 20 mA he output can also be indicated on the digital display 3 2 Sensor heH astings F M 60 operates a unique thermal electric principle whereby a metallic capillary tube is heated uniformly by resistance winding attached at the center of the capillary see figure 3 1 hermocouplesT 1 C 2 are positioned on each side of the heater coil are welded at equal distances from the mid point of the capillary At zero flow theT outputs are equal W hen flow occurs through the tubing heat is transferred from the heated region to the gas and from the gas back to the cool wall downstream hermocoupleT 1 measures the temperature upstream before the gas is heated and thermocoupleT C 2 measures the gas temperature down stream after itis heated D uring flow the temperature distribution along the sensor tube becomes skewed see figure 3 2 Conventionally the difference temperature of the two thermocouples provides a voltage difference that is proportional to flow Heater VDC Source PC Board For a constant power input the differential voltage is a function of mass flow rate and the heat capacity of the gas Since the heat capacity of many gases is relatively constant over wide ranges of temperature and pressure the flowmeter may be calibrated directly in mass units for those gases Changesin gas composition usually require app
27. r Figure 3 3 b shows the geometry for higher flow rates A single 304L stainless steel plug with an annular spacing of 0 009 accommodates the 500 sccm flow range Increasing the flow requires more annular passageways which is accomplished by adding concentric cylinder shells with increasing gap dimensions Eventually a maximum annular gap dimension for laminar flow is obtained 0 030 F or a maximum flow rate of 70 slpm three annular regions using two brass concentric cylinders is required T his patent pending shunt technol ogy also includes inboard sensor ports which ensure laminar flow without the turbulence associated with end effects T his unique flow geometry provides an exceedingly linear shunt A schematic diagram of theintegral flowmeter without the digital display module employing a 70 shunt is shown in figure 3 4 N ote the inboard location of the sensors inlet and outlet with respect to the inlet and outlet of the shunt Also note the screen disk and washer which used to minimize the radial velocity gradient entering the shunt his results amore uniform flow velocity profile and therefore more uniform flow in the annular passages of the shunt 10 sccm 200 sccm typical configuration figure 3 3 a 500 sccm 70sim typical configuration figure 3 3 b page 15 3 5 Electronic Circuitry T heH FM 60 employs a thermal flow sensor capillary tube described in section 3 2 to measure the
28. t the display pot for that full scale flow rate Itis also possible to disconnect the phone jack between the display and flowmeter and supply external power 5VDC and a full scale voltage 0 5 DC to the display R efer to the schemat ics of PC B 846 in section of this manual he display may then be adjusted consistent with the particular full scale flow for the selected shunt N ote that there may beneed to change the display board solder jumpers order to exhibit the new full scale flow rate Largest Display Value Jumper Setting 1999 Alljumpers open 199 9 JP 1 closed 19 99 JP 2 closed 1 999 JP 3 closed page 11 12 SECTION 3 Theory of Operation his section contains an overall functional description of the H F M 60 D etailed schematics and parts lists can be found at the end of the manual in Section 5 0 In this section and other sections throughout this manual it is assumed that the customer is using the wall transformer power supply supplied by H astings or aH astings Power Supply 31 Overall Functional Description T he HFM 60 consists of a sensor a base shunt and electronic circuitry he sensor measures the gas flow rate from 0 to 10 sccm T he shunt divides the flow such that the flow through the sensor a precise percentage of the flow through the shunt he flow through both the sensor and shunt islaminar he circuit board amplifies the sensor output from the two C hromel thermoc
29. the flow connections Electrical Connections If a wall transformer power supply from astings Instruments is used installation consists of connecting the 4 conductor cable to the 4 pin connector located on the side of the flowmeter T he power is supplied to the instrument on 1 15 to 25VDC and pin 2 ground he output is measured on 3 0 5VDC or 4 20 mA and pin 4 ground If aH astings odel 400 200 40 10 power supply is used installation consists of connecting a 4 conductor cable to the terminal strip on the rear of the supply to the 4 pin connector located on the side of the flowmeter similar to that described above A Iso a cable with a male D connector can be supplied that mates with the power supply he D connector cable provides 15VDC on pin 11 and the0 5VDC output on Pins 5 and 12 are common and pin 7 is chassis ground 26 Operation he standard instrument output is a0 5VDC out and the signal is proportional to the flow i e 0 volts zero flow and 5 volts 100 of rated flow T he low noise 4 20 mA option is also proportional to flow 4 mA zero flow and 20 mA 100 of rated flow 2 6 1 OperatingTemperature F or proper operation the combination of ambient temperature and gas temperature must be such that the flowmeter temperature remains between 0 and 50 C M ost accurate measurement of flow will be obtained if the flowmeter is zeroed at operating temperature as temperatur
30. ue to the large internal diameter 0 020 Each flowmeter has ashunt which be quickly and easily exchanged in the field to different ranges Calibration however is required hefilters located upstream of the shunt and sensor eliminate most of the larger particulates and impurities which tend to clog the sensor tube TheHFM 60 is available ranges from 0 10 sccm to 0 60 slpm air equivalent flow Special ranges are available upon request T he HFM 60 is constructed of 6061 T 6 aluminum alloy Buna N is standard for the O rings seals Other elastomers are available upon request e g alrez V iton hetemperature coefficient of the 60 is less than 0 1 C from 0 50 C he 4 20 mA option gives the user the advantages of current loop output to minimize environmental noise pickup heoptional 0 90 tiltable digital display allows convenient real time indication of the flow rate helow pressure drop across this instrument is ideal for leak detection applications page5 page 12 Specifications lt 3 F S Repeatability 0 2 of F S typical 0 4 of F S max Maximum 5 a a dae ch ies 150 psi Pressurecoefficient a a 0 01 psi Operating
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