NesLab RTE-111 Bath Circulator Instruction and Operation Manual
Contents
1. Condenser A Error Messages For proper operation the unit needs to pull substantial amounts of air through a condenser A build up of dust or debris on the fins of the condenser will lead to a loss of cooling capacity Periodic vacuuming of the condenser is necessary To access the condenser the front grille must be removed The unit must be turned off before the front panel is removed RTE 111 units have a one piece grille assembly Pull forward to remove RTE 211 and RTE 221 units have a two piece grille assembly First remove the left blue colored section by simply pulling it forward Pull forward on the remaining white colored section to remove it The frequency of cleaning depends on the operating environment After initial installation we recommend a monthly visual inspection of the con denser After several months the frequency of cleaning will be established Error Action Er00 ROM Checksum Er01 RAM Test Failed Er02 Keypad Test Failed Er04 13 Interrupt Error Er14 Synchronous Error Er15 Asychronous Error Er16 Bad Calibration LoT Low Temp Limit HiT High Temp Limit Er23 RTD2 Shorted Er24 RTD2 Open Not Installed Er25 RTD1 Shorted Er26 RTD1 Open HTC High Temperature Cutout PrES Pressure Cutout NOTE HTC and PrES are optional displays available only on specially modified units Errors 00 through 15 will lockup the controller keypad Errors 00 through 03 may be cleared by depressing the2. Unfavorably high total ionized solids TIS can accelerate the rate of gal vanic corrosion These contaminants can function as electrolytes which increase the potential for galvanic cell corrosion and lead to localized corrosion such as pitting which can be observed at the studs and on the outside surface of cooling coils Eventually the pitting will become so extensive that the coil will leak refrigerant into the water reservoir For example raw water in the U S averages 171 ppm of NaCl The recommended level for use in a water system is between 0 5 to 5 0 ppm of NaCl Recommendation Initially fill the tank with distilled deionized water Do not use untreated tap water as the total ionized solids level may be too high Maintain this water quality at a resistivity of between 1 to 10 megohm cm compensated to 25 C by using a purification system Although the initial fill may be as high as 10 megohm cm compensated to 25 C the desired level for long time usage is 1 to 3 megohm cm compensated to 25 C The above two recommendations will reduce the electrolytic potential of the water and prevent or reduce the galvanic corrosion observed NotRecommended Increasingly Corrosive 15 00 10 00 Operations with Stainless Steel Systems 3 00 Operations with 1 00 Mixed Metals Copper Brass Stainless Steel CONSULT MATERIALS ENGINEER Resistivity megohm cm 25 C 0 10 0 05 10 20 30 40 50 60 70 80 C
3. 1095 The unit construction provides extra protection against the risk of electric shock by grounding appropriate metal parts The extra protection may not function unless the power cord is connected to a properly grounded outlet It is the user s responsibility to assure a proper ground connection is provided For 220 240 volt units supplied without a line cord use a harmonized HAR grounded 3 conductor cord type H05V V F with conductors listed below A suitable cord end is required for connecting to the equipment see unit socket and must terminate with an IEC approved plug for proper connection to power supply RTE 221 Nominal 1 5 mm cross section rated 16 Amps Unit Socket IEC 320 C19 RTE 111 and RTE 211 Nominal 1 0 mm cross section rated 10 Amps Unit Socket IEC 320 C13 Plumbing Requirements A Ensure the unit is off before connecting tubing to the unit To prevent damage to the plumbing lines always support the 3 4 fittings while installing removing the pumping caps and lines Hose Connections The pump connections are located at the rear of the pump box and are labelled PUMP INLET and PUMP OUTLET These connections are bent upward so the recirculating fluid will drain back into the reservoir when the hoses are disconnected Both connections are capped with stainless steel serrated plugs The pump lines have 74 MPT for mating with standard plumbing fittings For your convenience stainless steel adapters
4. AnA as the mode of temperature gt v LOC control overrides both manual e F input from the keypad and any o H H H H N O e serial communication input HiT CONTINUED ON NEXT PAGE Figure 2 Setup Loop 1 of 2 13 CONTINUED FROM PREVIOUS PAGE YES Hit High Temperature Limit Lot Low Temperature Limit r232 RS232 Protocol bAUd BAUD rate default 9600 dAtA Data Bits default 8 StoP Stop Bit default 1 PAr Parity default NONE U id Unit Identification Number used for serial communication Stor Store Q v NO YES OFF 2 e ENTER GOTO OPERATOR S LOOP A 3 i z o eo ENTER ENTER 1 e 4 vy e 5 b e NEXT v AtA e NEXT e OF i amp s STORE CHANGES OREO ENTER ENTER Figure 2 Setup Loop 2 of 2 e 4 9 y i NOTE To save all changes when the display reads Stor press YES Should you desire to return to the temperature display and abort a changes when the display reads Stor press NO 14 High Temperature Low Liquid Level Safety To protect your application the adjustable High Temperature Low Liquid Level Safety HIGH TEMP LOW LEVEL ensures the heater will not exceed temperatures that can cause serious damage to your unit A single tempera ture sensor located on the heat
5. When the controller is first powered up it performs a quick self test then enters the Operator s Loop The Operator s Loop displays the bath tempera ture and is used to change the setpoint see page 12 The Setup Loop can be accessed from the Operator s Loop by pressing and holding the key combina tions shown on Figure 1 on the next page The Setup Loop is used to adjust the controller s PID parameters select either the internal or optional external sensor and set the high low temperature limits It is also used to select RS232 parameters and display the unit s identification number See pages 13 14 11 Operator s Loop When the controller is first powered up it enters the Operator s Loop display ing reservoir fluid temperature Press the NEXT ENTER key to view the setpoint SP displays the controller setpoint The display will flash between SP and the actual setpoint number Use the YES NO keys to change the setpoint value Once the desired setpoint is displayed press the NEXT ENTER key twice NOTE If the bath is controlled via RS232 communications the setpoint can not be changed from the keypad HOLD GO TO 0 xXx v e SETUP LOOP NEXT C bis ENTER NEXT C XXX X Reservoir Fluid Temperature ENTER NEXT SP Setpoint ENTER C sp NEXT ENTER Figure 1 Operator s Loop 12 Setup Loop v GOTO OPERATORS LOOP 0e NO The Setup Loop is used to adjust the controller s PI
6. F0 02 01 2C CA 00 01 F0 02 01 2C DF 2 bytes to follow The temperature of 30 0 C is 300 decimal 012C hex The slave responds The qualifier byte of 11 indicates a precision of 1 decimal point and units of C The temperature of 7 30 0 C is 300 decimal 012C hex command byte CA 00 01 FO 03 11 01 2C CD The checksum is the bitwise inversion of 3 bytes to follow 32 00 01 F0 03 11 01 2C 29 Table 1 All bytes are in hex FUNCTION MASTER SENDS BATH RESPONDS READ Read Internal Temperature CA 00 01 20 00 DE CA 00 01 20 03 qb d1 d2 cs Read External Sensor CA 00 01 21 00 DD CA 00 01 21 03 qb d1 d2 cs Read Setpoint control point CA 00 01 70 00 8E CA 00 01 70 03 qb d1 d2 cs Read Low Temperature Limit CA 00 01 40 00 BE CA 00 01 40 03 qb d1 d2 cs Read High Temperature Limit CA 00 01 60 00 9E CA 00 01 60 03 qb d1 d2 cs Read Proportional Band P CA 00 01 71 00 8D CA 00 01 71 03 qb d1 d2 cs Read Integral I CA 00 01 72 00 8C CA 00 01 72 03 qb d1 d2 cs Read Derivative D CA 00 01 73 00 8B CA 00 01 73 03 qb d1 d2 cs SET Set Setpoint control point CA 00 01 F0 02 d1 d2 cs CA 00 01 F0 03 qb d1 d2 cs Set Low Temperature Limit CA 00 01 C0 02 d1 d2 cs CA 00 01 CO 03 qb d1 d2 cs Set High Temperature Limit CA 00 01 E0 02 d1 d2 cs CA 00 01 E0 03 qb d1 d2 cs Set Proportional Band CA 00 01 F1 02 d1 d2 cs CA 00 01 F1 03 qb d1 d2 cs P 1 99 9 Set Integral I 0 9 99 CA 00 01 F2 02 d1 d2 cs CA 00 01 F2 03 qb di d2 cs
7. NEXT ENTER key 21 Additional Loops NO HOLD TMP XXX XC v C gt A NEXT NO ENTER Setup Loop v NO HOLD e a Q zs NO YES YES YES Calibration Loop HOLD 10 SECS v mE Chip Number o Software Number NO NEXT ENTER C NEXT ENTER C Checksum Code NEXT ENTER NEXT Figure 3 Additional Loops 22 T ENTER Software Version 1 2 A B Calibration Loop Calibration Procedure The Calibration Loop is used to calibrate the RTD high and low temperature The controller s internal temperature sensor is factory calibrated We recommend calibrating any external sensor Enter the Calibration Loop from the Operator s Loop by pressing and holding the NO key while pressing the YES key three times Install a calibrated reference thermometer in the bath For external mode also install the sensor in the bath Place the cover on the unit The procedure uses the Operator s Setup and Calibration Loops In the Setup Loop place the unit in either the internal or external RTD mode of operation RTD1 Internal RTD2 External Return to the Operator s Loop and adjust the setpoint to an appropriate high end temperature NOTE When calibrating the external sensor ensure the controller s SENSOR indicator is illuminated Once the bath reaches the setpoint and stabilizes go to the Calibration Loop and as illus
8. Water Quality Considerations 9 Start Up Controller Keypad amp Display Section IV Operation Before starting the unit check all electrical and plumbing connections and make sure the work area has been properly filled with bath fluid To start the bath place the I O circuit breaker on the side of the control box to the I power on position The pump will start and the controller will display the temperature of the fluid in the reservoir The digital controller controls temperature using a PID Proportional Integral Derivative algorithm It is designed with self diagnostic features and easy to use operator interface HEAT REMOTE C C cooL SENSOR O The controller s HEAT and COOL indicators show the status of the refrigera tion system and heater The HEAT indicator is lit when the heater is on The HEAT indicator flashes when the heater is pulsating The COOL indicator is lit when the refrigeration system is removing heat from the cooling fluid A balance between COOL and HEAT controls the temperature NOTE Below 50 C the refrigeration system is on unless the setpoint is more than 2 C above the bath temperature This allows for rapid heat up Above 50 C the refrigeration system is off unless the setpoint is more than 2 C below the bath temperature This allows for rapid cool down The REMOTE indicator illuminates whenever the unit is configured to accept a remote setpoint The contr
9. modify any unit previously manufactured THE FOREGOING EXPRESS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Thermo NESLAB S OBLIGATION UNDER THIS WARRANTY IS STRICTLY AND EXCLUSIVELY LIMITED TO THE REPAIR OR REPLACEMENT OF DEFECTIVE COMPONENT PARTS AND Thermo NESLAB DOES NOT ASSUME OR AUTHORIZE ANYONE TO ASSUME FOR IT ANY OTHER OBLIGATION Thermo NESLAB ASSUMES NO RESPONSIBILITY FOR INCIDENTAL CONSEQUENTIAL OR OTHER DAMAGES INCLUDING BUT NOT LIMITED TO LOSS OR DAMAGE TO PROPERTY LOSS OF PROFITS OR REVENUE LOSS OF THE UNIT LOSS OF TIME OR INCONVENIENCE This warranty applies to units sold in the United States Any units sold elsewhere are warranted by the affiliated marketing company of Thermo NESLAB Instruments Inc This warranty and all matters arising pursuant to it shall be governed by the law of the State of New Hampshire United States All legal actions brought in relation hereto shall be filed in the appropriate state or federal courts in New Hampshire unless waived by Thermo NESLAB
10. or operating your unit If you have any questions concerning the operation of your unit or the information in this manual contact our Sales Department Performance of installation operation or maintenance procedures other than those described in this manual may result in a hazardous situation and may void the manufacturer s warranty Transport the unit with care Sudden jolts or drops can damage the refrigeration lines The units weigh approximately RTE 111 86 pounds 390 kilograms RTE 211 99 pounds 45 kilograms RTE 221 106 pounds 48 kilograms Units should be transported with equipment designed to lift these weights Observe all warning labels Never remove warning labels Never operate damaged or leaking equipment Never operate the unit without bath fluid in the bath Never use pure ethylene glycol as a bath fluid Above 80 C the user is responsible for the fluid used For 220 240 volt units supplied without a line cord use a harmonized HAR grounded 3 conductor cord type H 05V V F with conductors listed below A suitable cord end is required for connecting to the equipment see unit socket and must terminate with an IEC approved plug for proper connection to power supply RTE 111 and RTE 211 Nominal 1 0 mm cross section rated 10 Amps Unit Socket IEC 320 C13 RTE 221 Nominal 1 5 mm cross section rated 16 Amps Unit Socket IEC 320 C19 Always turn off the unit and disconnect the line cord from the powe
11. rear of the unit to identify the specific electrical requirements of your unit Check the High Temperature Low Liquid Level Safety If the red LED on the side of the controller is on make sure the fluid level in the bath is between the marks in the baffle and the HIGH TEMP LOW LEVEL SAFETY setting is greater than the fluid temperature Turn the I O switch off then back on and attempt to restart Loss of cooling capacity Be sure the cooling capacity of the unit has not been exceeded if circulating to an external system When the unit is shut off wait approximately five minutes before restarting This allows time for the refrigeration pressures to equalize If the pressures are not allowed to equalize the compressor will short cycle clicking sound and no cooling will occur Proper ventilation is required for heat removal Make sure ventilation through the front and rear panels is not impeded and the panels are free of dust and debris Ice build up on the cooling coils can act as insulation and lower the cooling capacity Raise the temperature of the bath to de ice the cooling coil and increase the concentration of non freezing fluid No external circulation Check for obstructions kinks or leaks in the circulation tubing Circulation will cease when the pump head has been exceeded No poor temperature control Check RS232 remote operation on or off Selecting the optional Analog Input AnA as the mode of temperature control ov
12. 11 RTE 221 25 C to 150 C 23 C to 150 C 0 01 C 500 1705 15 Ipm at 0 0 M 0 Ipm at 16 4 9 M 800 800 1600 1000 1000 1800 R134a 434 x 8x 6 914 x 10x 6 914 x 10x 9 12 1 x 20 3 x 15 3 23 5 x 25 4 x 152 23 5 x 25 4 x 22 9 1 9 3 2 5 4 7 0 12 1 20 5 25 x 105 16 x 157 8 25 x 123 8 x 183 8 277 8 x 123 8 x 183 8 63 5 x 26 2 x 40 3 63 5 x 31 4 x 46 7 70 8 x 31 4 x 46 7 115 V 60 Hz 220V 50 Hz 86 99 106 39 45 48 Low end temperature for 50Hz units is 18 C 23 C and 21 C respectively 2 Specifications listed for units operating to 5 C using water Other specifications determined using fluid with specific heat of 0 6 ambient 20 C 70 F Foroperation below 0 C covering the bath work area may improve stability 4 Forsome applications agitation and stability above ambient may be improved by connecting a small length of hose between the pump connections on the rear of the unit 50 Hz RTE 111 units have a 375 watt cooling capacity 6 Add 1 inches 3 8 cm to depth for plumbing fittings 7 Control transformer fusing 115VAC units T Time Delay 500mA 250V 5 x 20mm Qty 1 220VAC units T Time Delay 250mA 250V to 5 x 20mm Qty 2 Bussman fusing part numbers 500mA fuse Bussman S504 500mA 250mA fuse Bussman S504 250mA w oa 4 Site Electrical Requirements Section Ill Installation The indentations on the unit s sides are designed to function as handles Lift the unit by the
13. 4 FPT to s O D serrated fitting are provided To assure proper fit they should be installed using 172 turns of Teflon tape around the threads Flexible tubing if used should be of heavy wall or reinforced construction Make sure all tubing connections are securely clamped Avoid running tubing near radiators hot water pipes etc If substantial lengths of tubing are necessary insulation may be required to prevent loss of cooling capac ity Tubing and insulation are available from Thermo NESLAB Contact our Sales Department for more information see Preface After sale Support It is important to keep the distance between the unit and the external system as short as possible and to use the largest diameter tubing practical Tubing should be straight and without bends If diameter reductions must be made make them at the inlet and outlet of the external system not at the unit If substantial lengths of cooling lines are required they should be pre filled with bath fluid before connecting them to the unit This will ensure that an adequate amount of fluid will be in the bath once it is in operation Pumping The pump is designed to deliver a flow of 15 liters per minute 4 gallons per minute at O feet head To prevent external circulation the PUMP INLET and PUMP OUTLET lines on the rear of the unit are capped The caps must be removed when external circulation is required To properly secure external hose connections to the un
14. Appendix A the male is used with an optional external sensor COMM SENSOR 4321 12345 00000 ooooo 9876 6789 COMM Pin Connections Pin OMAN DOA A ON gt Hardware Function No connection TX Transmitted data from controller RX Received data to controller No connection GND Signal ground No connection No connection No connection No connection Internal Connector Mating Connector AMP Part 745491 2 AMP Part 745492 2 Remote Sensor Connections Pin OMAN OAR WD gt Hardware Function 3 wire RTD connection A Example No connection No connection 3 wire RTD connection A No connection No connection 3 wire RTD connection B No connection No connection RTD Internal Connector Mating Connector AMP Part 745492 2 AMP Part 745491 2 16 Analog Interface Optional An optional 15 pin D subminiature female receptacle for analog inte located on the rear of the control pump box Pin Function rface is ACCESSORY 876543821 1 Chassis ground oC 2 Noconnection 0000000 3 5 Noconnection 15 14 18 12 11109 6 Analog Ground The analog ground is physically separated from the power ground throughout the unit To prevent offsets that result from ground currents the analog and power grounds are only connected at the unit s power supply Analog ground should only be used as a reference pin 7 Temperature Out The fluid temperature as measured by th
15. D parameters select either the internal 1 or optional external 2 sensor set the high low temperature limits adjust RS232 parameters and display alter the unit s ID number Enter the Setup Loop from the Operator s Loop by pressing and holding the NO key then press the NEXT ENTER key Use the YES NO keys to adjust the values Press the NEXT ENTER key twice to accept the new value Press the NEXT ENTER key only once if the value did not change While in the Setup Loop if a key is not pressed during a one minute time span the controller will automatically return to the Operator s Loop NOTE If the unit exceeds either temperature limit the appropriate error message will flash see page 21 The unit will not shut down unless the temperature also exceeds the high temperature safety setting see page 15 You will also receive an error code if the optional external sensor is selected but it is not installed tUnE Tune HEAt Heat PID Parameters Pro Proportional Band factory value 1 3 Int Integral factory value 0 75 repeats per minute dEr Derivative factory value 0 05 minutes X rtd Sensor Ww i ae HEAt 2 External SP Setpoint source optional display see page 17 Hit High Temperature Limit lt m o XX X A a lt m o i 9 v e E v ta YES NO NEXT e e ENTER ENTER X A AnA Optional Selecting Analog Input
16. RTE Series Refrigerated Bath Circulators Digital Controller Thermo NESLAB Manual P N U00479 Rev 12 12 00 Instruction and Operation Manual idealvac com deal vacuum products 505 872 0037 idealvac com PREFACE SECTION I Safety SECTION II General Information SECTION III Installation SECTION IV Operation SECTION V Maintenance SECTION VI Troubleshooting APPENDIX A APPENDIX B WARRANTY Table of Contents GCOMPI ANCE LEUTE 2 Unpacklhg croire iiio e treo A 2 luy E 2 Mssmep xS 2 After sale Support sssssssssssssseseeeee emeret 2 LIED 3 gregi m 4 Specifications EP 4 SUG HHT 5 Electrical Requirements c ccccccccccecceeeeeeeeeeeeeeeeenceeaaeeaeeeeeeeeeeeeeeeeess 5 Plumbing Requirements ssesssssseeeeeenneenennnne 6 gU ELM 8 Filling Requirements c eo i reiecta ace Ra ped e tede 8 Water Quality Standards and Recommendations 9 cundo 10 Controller Keypad amp Display ssessem e 10 Changing a Valle 2 ind and nna n t a eds 11 Controller Displays erresis poi irern A eee 11 Operator s LOOP rainen a ai a a 12 Setup LOOD TEE 13 High Temperature Low Liquid Level Safety sess 15 9 Pin Accessory Connectors
17. Set Derivative D 0 5 0 CA 00 01 F3 02 d1 d2 cs CA 00 01 F3 03 qb d1 d2 cs BATH ERROR RESPONSES Bad Command N A CA 00 01 OF 02 01 edcs Bad Checksum N A CA 00 01 OF 02 03 ed cs MISCELLANEOUS Request Acknowledge CA 00 01 00 00 FE CA 00 01 00 02 v1 v2 cs command bytes shown in bold qb qualifier byte d1 d2 16 bit signed integer ofthe value being sent or received cs the checksum of the string see text ed echo back of the command byte as received v1 v2 protocol version limited to the range of the bath Table 2 QUALIFIER BYTE 10 hex 0 1 precision no units of measure 20 hex 0 01 precision no units of measure 11 hex 0 1 precision C units Example The temperature of 45 6 C would be represented by the qualifier 11 hex followed by the 2 bytes 01 C8 hex 456 decimal Appendix B Programming Software NEScom Software RS232 Communication The Thermo NESLAB Communications Software is a user friendly software that allows you to automate your temperature control process The software includes a 372 disk comprehensive operator s manual and a toll free number to a trained technical staff NEScom Software allows you to write custom temperature programs for our Digital or Microprocessor based temperature control apparatus Choose upper or lower temperature limits and monitor system status with an alarm NEScom can also record your results on a user selectable graph NesCom must be used with an IBM or 10096 compat
18. al Communications Protocol NC is based on a master slave model The master is a host computer while the slave is the bath s controller Only the master can initiate a communications transaction half duplex The slave ends the transaction by responding to the master s query The protocol uses an RS 232 serial interface with the default parameters 9600 baud 1 start bit 8 data bits 1 stop bit and no parity NOTE Before the unit will communicate RS232 must be turned on in the controller s Setup Loop The unit can be controlled through your computer s serial port by using the unit s standard 9 pin RS 232 connection Data read of the serial port con nects to the data transmit pin 2 of the bath Data transmit of the serial port connects to data read pin 3 of the bath Data to computer Data Transmit 2 Data from computer Data Read 3 NESLAB Controller RS232 Port Signal Ground 5 9 pin male D connector Cable Communication cables are available from Thermo NESLAB Contact our sales department for additional information All commands must be entered in the exact format shown in the tables on the following pages The tables on on the last page of this Appendix show all commands available their format and responses Controller responses are either the requested data or an error message The controller response must be received before the host sends the next command The
19. e number of data bytes following the command byte The bath will respond to a Read Function by echoing the lead character address and command byte followed by the requested data and checksum When the bath sends data a qualifier byte is sent first followed by a two byte signed integer 16 bit MSB sent first The qualifier byte indicates the precision and units of measure for the requested data as detailed in Table 2 see page 30 As an example the master requests to read internal temperature by sending The checksum is the bitwise command byte inversion of 21 00 01 20 00 CA 00 01 20 00 DE yte values are in hex O bytes of data If the temperature is 10 5 C the slave would reply The qualifier byte of 11 indicates a precision of 1 decimal point and units of C The temperature of 10 5 C is 105 decimal FF97 hex command byte CA 00 01 20 03 11 FF 97 34 3 bytes to follow The checksum is the bitwise inversion of C8 00 01 20 03 11 FF 97 28 The master sets parameters in the bath by sending one of the Set Functions as shown in Table 1 The master does not send a qualifier byte in the data field The master should be preprogrammed to send the correct precision and units it could also read the parameter of interest first to decode the correct precision and units needed For example if the master wants to set the setpoint to 30 C it would send The checksum is the bitwise inversion of 20 commandbyte 00 01
20. e sensor slected in theSetup Loop see page 13 can be read at this pin The temperature scale is 10mV C referenced to analog ground pin 6 example 150mV 15 0 C 8 Noconnection 9 Power Ground 5V RTN 10 13 Noconnection 14 5V Power supply of 5VDC 15mA maximum 15 Setpoint In The temperature setpoint can be controlled by applying a known voltage to this pin The temperature scale is 10mV C referenced to analog ground pin 6 example 230mV 23 0 C Note The setpoint is updated only when the voltage represents a temperature within the setpoint limits The analog setpoint signal Setpoint In is enabled using the unit s software Using the Setup Loop discussed on page 13 keep depressing the NEXT ENTER key until SP is displayed Use the YES or NO key to display the desired mode AnA for analog or LoC for local then press NEXT ENTER to continue with the loop NOTE The last value entered is maintained when SP is changed from AnA to LOC or LOC to AnA until a val voltage is applied Store the change NOTE Selecting Analog Input AnA as the mode of temperature control overrides bot manual input from the keypad and any serial communication input The Analog In and Analog Out on pages 23 and 24 is applicable id h discussed in the Calibration Loop A 7m 847 e to this unit Analog In calibration is done by applying a 2Vdc ios O e 9i signal for AiH and a OVdc signal AL o0 for AiL R
21. eference the appropri v oe ate pins on the ACCESSORY 2 OSO connector A Analog Out calibration is done by ENTER ENTER ET measuring the appropriate pins e on the ACCESSORY connector 1 ENTER ENTER Adjust the AoH to 1 000Vdc aT using the YES and NO keys then press ENTER twice Adjust the AoL to 0 000Vdc using the YES C N OSO and NO keys then press ENTER twice 17 ENTER ENTER Autorefill Optional Float Switch The autorefill device is designed to maintain the correct level of fluid in the reservoir The device consists of a float switch and a solenoid valve If the fluid level falls the float switch opens the solenoid valve allowing makeup fluid to fill the reservoir Once the fluid reaches the proper level the float switch rises and the solenoid valve closes The plumbing connection for the autorefill device labeled WATER INLET is located on the rear of the autorefill assembly The connection is s OD stainless steel To prevent damage to your hosing and to prevent the hose from slipping of the connection install the supplied hose barb into your tubing Tubing is also available from Thermo NESLAB Contact our Sales Department Remove the nut on the WATER INLET connection and install the tubing from your makeup fluid source Reinstall the nut and tubing on the connec tion Install the device on the unit To secure the device to the unit tighten the screw located bet
22. er coils in the bath monitors both conditions A High Temperature Low Liquid Level fault occurs when the temperature of the sensor exceeds the set temperature limit The safety switch has a temperature range of 7 C to 180 C In the event of a fault the red LED near the adjustment dial will light the display will go blank and the unit will shut down The cause of the fault must be identified and corrected before the unit can be restarted The safety is not preset and must be adjusted during initial installation To set the safety locate the HIGH TEMP LOW LEVEL SAFETY adjustment dial on the right side of the pump box Turn the dial fully clockwise and turn the I O switch off then back on Start the unit Adjust the setpoint for a few degrees higher than the highest desired fluid temperature and allow the bath to stabilize at the temperature setpoint Turn the HIGH TEMP LOW LEVEL SAFETY dial counterclockwise until you hear a click and the unit shuts down The red LED near the adjust ment dial will light to indicate a fault has occurred Cool the bath and then without moving the adjustment dial turn the I O switch off then back on NOTE Thermo NESLAB recommends rechecking operation if the unit is moved e i High Temperature Low Liquid Level Safety 15 9 Pin Accessory Connector The unit is equipped with two 9 pin D connectors located on the rear of the control box The female COMM is used for RS232 communication see
23. errides both manual input from the keypad and any serial communication input Check external sensor connection Perform calibration Continued on next page 25 No serial communications All units are tested for serial communications before they leave the factory Ensure the REMOTE indicator on the controller is illuminated Check all communications commands they must be exact See Appendix A Check communications settings The protocol uses an RS 232 serial inter face with the parameters 9600 baud 8 data bits 1 stop bit and no parity Check all wiring for proper connections or possible shorts Software to verify serial communication is available from Thermo NESLAB Service Assistance and Technical Support If after following these troubleshooting steps your unit fails to operate properly contact our Customer Service Department for assistance see Preface After sale Support In addition to arranging warranty service our Service Department can provide you with a wiring diagram and a complete list of spare parts for your unit Before calling please obtain the following Part number Serial number Software Version 26 Appendix A Serial Communications Protocol NOTE This appendix assumes you have a basic understanding of commu nications protocols All data is sent and received in binary form do not use ASCII In the follow ing pages the binary data is represented in hexadecimal hex format The Neslab Seri
24. espect to warranty claims is limited to performing the required repairs or replacements and no claim of breach of warranty shall be cause for cancellation or recision of the contract of sales of any unit With respect to units that qualify for field service repairs Thermo NESLAB s responsibility is limited to the component parts necessary for the repair and the labor that is required on site to perform the repair Any travel labor or mileage charges are the financial responsibility of the buyer The buyer shall be responsible for any evaluation or warranty service call including labor charges if no defects are found with the Thermo NESLAB product This warranty does not cover any unit that has been subject to misuse neglect or accident This warranty does not apply to any damage to the unit that is the result of improper installation or maintenance or to any unit that has been operated or maintained in any way contrary to the operating or maintenance instructions specified in Thermo NESLAB s Instruction and Operation Manual This warranty does not cover any unit that has been altered or modified so as to change its intended use In addition this warranty does not extend to repairs made by the use of parts accessories or fluids which are either incompatible with the unit or adversely affect its operation performance or durability Thermo NESLAB reserves the right to change or improve the design of any unit without assuming any obligation to
25. handles and locate it on a sturdy work area Ambient tem peratures should be inside the range of 50 F to 104 F 10 C to 40 C Never place the unit in a location where excessive heat moisture or corrosive materials are present The unit has an air cooled refrigeration system Air is drawn through the front panel and discharged through the rear panel The unit must be positioned so the air intake and discharge are not impeded A minimum clearance of 12 inches 30 centimeters at the front and rear of the unit is necessary for adequate ventilation Inadequate ventilation will reduce cooling capacity and in extreme cases can cause compressor failure Excessively dusty areas should be avoided and a periodic cleaning schedule should be instituted see Section VI Cleaning The unit will retain its full rated capacity in ambient temperatures up to approximately 75 F 24 C Above 75 F reduce the cooling capacity 1 for every 1 F above 75 F to a maximum ambient temperature of 104 F In terms of Celsius reduce the cooling capacity 196 for every 0 5 C above 24 C to a maximum ambient temperature of 40 C Line voltage may be easily accessible inside the pump control box Always unplug the unit prior to removing pump control box cover Refer to the serial number label on the rear of the unit to identify the specific electrical requirements of your unit Ensure the voltage of the power source meets the specified voltage
26. host sends a command embedded in a single communications packet then waits for the controller s response If the command is not understood or the checksums do not agree the controller responds with an error command Otherwise the controller responds with the requested data If the controller fails to respond within 1 second the host should resend the command 27 NC Serial Communications Protocol NOTE All byte values are shown in hex hex represents the binary values that must be sent to the bath Do not use ASCII The framing of the communications packet in both directions is Checksum region Lead char Addr MSB Addr LSB Command nd bytes d byte 1 ae d byten Checksum CA 00 01 Lead char CA hex Device address is 1 Addr msb Most significant byte of device address is 00 hex Adar Isb Least significant byte of device address is 01 hex Command Command byte see Table 1 n d bytes Number of data bytes to follow 00 to 03 hex d byte 1 1 data byte the qualifier byte is considered a data byte d byte n n data byte Checksum Bitwise inversion of the 1 byte sum of bytes beginning with the most signifi cant address byte and ending with the byte preceding the checksum To perform a bitwise inversion exclusive OR the one byte sum with FF hex The master requests information by sending one of the Read Functions as shown in Table 1 on page 30 Since no data is sent to the bath during a read request the master uses 00 for th
27. ible computer Select from easy to use product icons Create graphs and charts Easily configure ramping functions that set the setpoint over time View pop up alarm windows that display if an alarm condition occurred o Ox ESI View Program Alarms Indicators Options Window Help e ontrolle NC Protocol A Open Workspace MICROprocessar Bath MRS 232C RS 232C Properties Cntl Enter Delete Shift Del RTE EX Digital NC Save Save As Print gt Exit v lt Pla Select software functions from the easy to use pulldown menus RMT SPT HEAT LEVEL COOL i 3 5 C NESLAB Instruments View a virtual controller screen which allows remote monitoring and operation of product control panel WARRANTY Thermo NESLAB Instruments Inc warrants for 12 months from date of shipment any Thermo NESLAB unit according to the following terms Any part of the unit manufactured or supplied by Thermo NESLAB and found in the reasonable judgment of Thermo NESLAB to be defective in material or workmanship will be repaired at an authorized Thermo NESLAB Repair Depot without charge for parts or labor The unit including any defective part must be returned to an authorized Thermo NESLAB Repair Depot within the warranty period The expense of return ing the unit to the authorized Thermo NESLAB Repair Depot for warranty service will be paid for by the buyer Thermo NESLAB s responsibility in r
28. it wrap Teflon tape around the pipe line threads before installation Once the hose connections are made the hoses must be properly plumbed to an external system It is important the bath is not in operation until all plumbing is complete NOTE To increase agitation in the bath when not circulating externally connect a short loop of hose between the inlet and outlet lines If the bath is not used for external circulation or increased agitation make sure the stainless steel caps are in place prior to operating the bath 6 Circulating to an open container gt Levelling Device Ii fr Outlet Inlet 1 Bath Rear View Open Container A stainless steel leveling device is available to aid circulation to an open vessel Contact our Sales Department for more information see Preface Support the leveling device over the open container with a ringstand Stagger the tubes in the leveling device so one tube is submerged in the vessel fluid and the other tube is level with the fluid surface Connect the deeper tube to the PUMP OUTLET and the shorter tube to the PUMP INLET Adjust the flow rate using the accessory flow control valve connected to the PUMP OUTLET or by partially restricting the outlet tubing When properly adjusted the pump inlet will draw an occasional air bubble to prevent over flow and the pump outlet will force fluid through the submerged tube to prevent aeration of the vessel To a
29. oller s SENSOR indicator illuminates whenever the optional external sensor is selected See Controller Displays on the next page for information on the C display NEXT ENTER Use this key to scroll forward through the menus and also to accept and save changes 10 Changing a Value Controller Displays YES A This dual purpose key is used to answer Yes to Y N questions or to incre ment numerical values upward for setting numeric values NO V This dual purpose key is used to answer No to Y N questions or to decre ment numerical values downward for setting numeric values The YES key increments the value The NO key decrements the value The display will flash as soon as either key is depressed and will continue to flash until the NEXT ENTER key is pressed twice to accept the new value The new value will not be used by the controller until the NEXT ENTER key is depressed twice and the display stops flashing NOTE If the ENTER key is not depressed twice within 10 seconds the controller will time out and the new value will not be accepted The controller will revert to the previous setpoint value The controller will not allow you to enter a value above the maximum or below the minimum normally 150 C and 25 C An alphanumeric display presents numeric readings of various operating conditions within the bath Display function is selected by pressing the appropriate keys to move through a menu of available information
30. operation from 30 C to 8 C a 50 50 mixture by volume of tap water and laboratory grade ethylene glycol is suggested Never use pure ethylene glycol as a bath fluid Above 80 C and below 30 C the user is responsible for the fluid used The bath work area has a high and low level marker to guide filling The markers are 1 inch horizontal slits located in the center of the stainless steel baffle separating the work area and the pump assembly The correct fluid level falls between these two markers The heating and cooling coils will be exposed and may become damaged if the correct fluid level is not provided When pumping to an external system keep extra fluid on hand to maintain the proper level in both the circulating lines and the external system Never run the unit when the work area is empty Avoid overfilling Overfilling the bath may damage the insulation and affects stability as well as low end performance Water Quality Standards and Recommendations Microbiologicals Permissible PPM Desirable PPM algae bacteria fungi 0 0 Inorganic Chemicals Calcium 40 0 6 Chloride 250 25 Copper 1 3 1 0 Iron 0 3 0 1 Lead 0 015 0 Magnesium 12 0 1 Manganese 0 05 0 03 Nitrates Nitrites 10 as N 0 Potassium 20 0 3 Silicate 25 1 0 Sodium 20 0 3 Sulfate 250 50 Hardness 17 0 05 Total Dissolved Solids 50 10 Other Parameters pH 6 5 8 5 7 8 Resistivity 0 01 0 05 0 1 Megohm Cm Compensated to 25 C
31. r source before performing any service or maintenance procedures or before moving the unit Always empty the bath before moving the unit Never operate equipment with damaged line cords Refer service and repairs to a qualified technician In addition to the safety warnings listed above warnings are posted throughout the manual These warnings are designated by an exclamation mark inside an equilateral triangle with text highlighted in bold print Read and follow these important instructions Failure to observe these instructions can result in permanent damage to the unit significant property damage personal injury or death ae Description Specifications Temperature Range Temperature Stability Cooling Capacity Watts BTU H Pump Capacity Heater Watts 60 Hz Models 50 Hz Models Refrigerant Bath Work Area L x W x D Inches Centimeters Bath Volume Gallons Liters Case Dimensions Inches H x W x D Centimeters H x W x D Power Requirements Shipping Weight Pounds Kilograms Section II General Information The RTE Series Refrigerated Bath Circulators are designed to provide temperature control for applications requiring a fluid work area or pumping to an external system Units consist of a non CFC air cooled refrigeration system circulation pump seamless stainless steel bath work area cover and a temperature controller RTE 111 RTE 2
32. rt is a 74 male Swageloc connector with an o ring seal 19 A Service Contracts Reservoir Cleaning Algae Section V Maintenance To avoid electrical shock disconnect the mains cord prior to remov ing any access panels or covers Thermo NESLAB offers on site Service Contracts designed to provide extended life and minimal down time for your unit For more information contact our Service Department see Preface After sale Support Routine cleaning can be achieved by simply sponging down the seamless stainless steel tank with tap water Dish washing detergent may be used but the tank must be thoroughly rinsed To gain access to the entire reservoir the pump box and reservoir cover should be removed Refrigeration Cable 3 Cable Strap Remove the line cord from the rear of the unit and then remove the four screws two on each side securing the reservoir s cover To get slack on the refrigeration cable remove the cable strap The cable itself does not need to be disconnected Turn the cover assembly over and carefully place it on a supporting plat form To restrict the growth of algae in the bath we recommend the bath cover be kept in place and that all circulation lines be opaque This will eliminate the entrance of light required for the growth of most common algae Thermo NESLAB recommends the use of Chloramine T 1 gram per 37 liters 20
33. sssessssse eee 16 Analog Interface Optional ss em 17 Autorenill Optiori l c2222 icit eue citt d t Ht Reed Eoo edd 18 Flow Control Valve Optional 19 Sealable Bath Lid Optional ssse 19 Service Contracts ee d ane re ecc uoc erede deu de RN ae eus 20 Reservoir Cleaning tro eret rh urnrehaioe ER E 20 AlAs E E 20 COMASNSER EE 21 Error Messages etg ere td e ee Bede tct e re cocks 21 Additional Loops ssssssssssssssseseee ai aa 22 Calibration LO0p 2 3 edet tarta attt deae tad than dad du EVER adde 23 Calibration Procedure ssssssssssssssseeeenen eene 23 Checklist E meee 25 Service Assistance and Technical Support esses 26 THERMO NESLAB SERIAL COMMUNICATION PROTOCOL PROGRAMMING SOFTWARE RS232 COMMUNICATION Compliance Unpacking Warranty Preface Products tested and found to be in compliance with the requirements defined in the EMC standards defined by 89 336 EEC as well as Low Voltage Directive LVD 73 23 EEC can be identified by the CE label on the rear of the unit The testing has demonstrated compliance with the following directives LVD 73 23 EEC Complies with UL 3101 1 93 EMC 89 336 EEC EN 55011 Class A Verification EN 50082 1 1992 IEC 1000 4 2 1995 IEC 1000 4 3 1994 IEC 1000 4 4 1995 For any additional information refer to the Letter of Compliance that shipped with the unit Declaration of Conformit
34. trated on the next page enter the actual reference ther mometer reading at either the r1H or r2H prompt Store the change and return to the Operators Loop Adjust the setpoint to an appropriate low end temperature Once the bath reaches the setpoint and stabilizes return to the Calibration Loop and enter the reference ther mometer reading at either the r1L or r2L prompt Store the change Do not pick points that are outside the safe operating limits of the fluid in your application For example with a water bath 90 C and 5 C would be typical calibration points 23 CAL rdtn A T rnH rnH XX X v YES pra ah GO TO NEN ENTER ENTER OPERATOR S Y a LOOP rnL rnL io XX X YES C i i ENTER ENTER rtdn nz 17 Internal sensor n 2 external sensor MESS mH High temperature rnL Low temperature Ain Only applicable to units with analog interface Aout Aout Only applicable to units with analog interface Stor Store YES SAVE CHANGES Figure 4 Calibration Loop NOTE To save all changes when the display reads Stor press YES Should you desire to return to the temperature display and abort all changes when the display reads Stor press NO 24 Checklist Section VI Troubleshooting Unit will not start Make sure the voltage of the power source meets the specified voltage 10 Refer to the serial number label on the
35. void siphoning the bath work area when the unit is shut off lift the leveling device out of the vessel and above the level of the unit Circulating through two closed loops lt 4 Pump Box System 1 ee Bath Work Area p System 2 Bath Top View The pump can be used to circulate through two closed loop systems Connect the shortest practical length of flexible tubing from the PUMP OUTLET to the inlet of external system 1 Connect the outlet of system 1 directly into the bath work area Connect tubing from the bath work area to the inlet of system 2 Connect the outlet of system 2 to the PUMP INLET A Fluids A A Filling Requirements Drain Ensure the temperature of the bath fluid is safe before draining the unit The unit is equipped with a drain located at the back of the unit at the base of the bath The drain has 74 MPT and is capped with a stainless steel plug To drain the reservoir simply remove the cap To assure proper fit when replacing the cap be sure to line the threads with 1 turns of Teflon tape Never use flammable or corrosive fluids with this unit The selected fluid must have a viscosity of 50 centistokes or less at the lowest operating temperature Filtered tap water is the recommended fluid for operation from 8 C to 80 C See Water Quality Standards and Recommendation on the next page For
36. ween the float switch and the makeup fluid outlet line If desired place the supplied cover on the unit The autorefill device requires its own source of electrical power A connector for the supplied line cord is also located on the rear of the autorefill device The connector is labelled POWER NESLAR Pese Makeup Fluid Outlet Line WATER INLET 18 Flow Control Valve Optional Sealable Bath Lid Optional An optional flow control valve is available to control external circulation The valve assembly consists of the nine pieces shown below Once assembled and installed on the unit clamp a hose to the end of the assembly Turn the unit on and check for leaks with the valve opened as well as closed c3 Direction of Flow Finger Tight E Finger Tight 1 Turn illl d ET External Hose Connections Bath Connections Spare Part Depending on your application requirements and or working envi ronment a bath lid is available to make RTE 111 reservoirs sealable not pressurized The top of the pump grate in the unit s reservoir has four holes cut into the sheet metal Align the protrusions on the lid with these holes as shown A locking adjustable grip latch tightens the lid to the tank top allowing an EDPM gasket to create a seal The lid also has a nitrogen purge port The purge po
37. y Retain all cartons and packing material until the unit is operated and found to be in good condition If the unit shows external or internal damage or does not operate properly contact the transportation company and file a damage claim Under ICC regulations this is your responsibility Units have a warranty against defective parts and workmanship for one full year from date of shipment See back page for more details NES care Extended Warranty Contract Extend parts and labor coverage for an additional year Worry free operation Control service costs Eliminate the need to generate repair orders No unexpected repair costs Other contract options are available Please contact Thermo NESLAB for more information After sale Support Thermo NESLAB is committed to customer service both during and after the sale If you have questions concerning the operation of your unit or the information in this manual contact our Sales Department If your unit fails to operate properly or if you have questions concerning spare parts or Service Contracts contact our Service Department Before calling please refer to the serial number label on the rear of the unit and page 22 to obtain the following information BOM number Serial number Software version see page 22 Warnings Section I Safety Make sure you read and understand all instructions and safety precautions listed in this manual before installing
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