Model 331 Temperature Controller
Contents
1. assigned independently to any alarm or be operated manually When not being used for temperature control the loop 2 control output can be used as an analog voltage output It can be configured to send a voltage proportional to temperature to a strip chart recorder or data acquisition system The user may select the scale and data sent to the output including temperature sensor units or linear equation results Under manual control the analog voltage output can also serve as a voltage source for other applications Model 331S Rear Panel Connections Line input assembly IEEE 488 interface Serial RS 232C I O DTE Terminal block for relays Heater output and analog output Sensor input connectors fax 614 818 1600 e mail info lakeshore com Configurable Display Both versions of the Model 331 include a bright vacuum fluorescent display that simultaneously displays up to four readings Display data includes input and source annunciators for each reading All four display locations can be configured by the user Data from either input may be assigned to any of the four locations the user s choice of temperature sensor units maximum minimum or linear equation results can be displayed Heater range and control output as current or power can also be continuously displayed for immediate feedback on control operation Normal Default Display Configuration The display provides four reading locations Readings2. Low temperature specified with self heating error lt 5 mK 6 Low temperature specified with self heating error lt 12 mK e mail info lakeshore com Model 331 Temperature Controller Typical Sensor Performance see Appendix F for sample calculations of typical sensor performance Example Nominal Typical sensor Measurement Electronic accuracy Temperature Electronic Lake Shore resistance voltage sensitivity resolution temperature accuracy including control stability sensor temperature equivalents electronic accuracy temperature equivalents CalCurve and equivalents calibrated sensor Silicon Diode DT 670 SD 13 1 4K 1 644 V 12 49 mV K 0 8 mK 13 mK 25 mK 1 6 mK with 1 4H 77K 1 028 V 1 73 mV K 5 8 mK 76 mK 98 mK 11 6 mK calibration 300 K 0 5597 V 2 3 mV K 4 4 mK 47 mK 79 mK 8 8 mK 500 K 0 0907 V 2 12 mV K 4 8 mK 40 mK 90 mK 9 6 mK Silicon Diode DT 470 SD 13 1 4K 1 6981 V 13 1 mV K 0 8 mK 13 mK 25 mK 1 6 mK with 1 4H 77K 1 0203 V 1 92 mV K 5 2 mK 69 mK 91 mK 10 4 mK calibration 300 K 0 5189 V 2 4 mV K 4 2 mK 45 mK 77 mK 8 4 mK 475 K 0 0906 V 2 22 mV K 4 6 mK 39 mK 89 mK 9 2 mK GaAlAs Diode TG 120 SD 1 4K 5 391 V 97 5 mV K 0 2 mK 7 mK 19 mK 0 4 mK with 1 4H 77K 1 422 V 1 24 mV K 16 2 mK 180 mK 202 mK 32 4 mK calibration 300 K 0 8978 V 2 85 mV K 7 mK 60 mK 92 mK 14 mK 475 K 0 3778 V 3 15 mV K 6 4 mK 38 mK 88 mK 12 8 mK 100 Platinum RTD PT 103 30 K 3 660 Q 0 191 Q K 10 5 mK 23 mK 33
3. control loop Sensor Inputs The Model 331 temperature controller is designed for high performance over a wide operating temperature range and in difficult sensing conditions The Model 331 features two inputs with a high resolution 24 bit analog to digital converter and separate current source for each input Sensors are optically isolated from other instrument functions for quiet and repeatable sensor measurements Sensor data from each input can be read up to ten times per second with display updates twice each second The Model 331 uses current reversal to eliminate thermal EMF errors in resistance sensors Standard temperature response curves for silicon diodes platinum RTDs and many thermocouples are included Up to twenty 200 point CalCurves for Lake Shore calibrated sensors or user curves can be loaded into non volatile memory via a computer interface or the instrument front panel A built in SoftCal algorithm can also be used to generate curves for silicon diodes and platinum RTDs for storage as user curves 1 The Lake Shore SoftCal algorithm for silicon diode and platinum RTD sensors is a good solution for applications requiring more accuracy than a standard sensor curve but not in need of traditional calibration SoftCal uses the predictability of a standard curve to improve the accuracy of an individual sensor around a few known temperature reference points Both versions of the Model 331 can generate SoftCal
4. curves 614 891 2244 fax 614 818 1600 e mail info lakeshore com Model 331 Temperature Controller Sensor inputs for both versions of the Model 331 are factory configured and compatible with either diode RTDs or thermocouple sensors The purchaser s choice of two diode RTD inputs one diode RTD input and one thermocouple input or two thermocouple inputs must be specified at time of order and cannot be reconfigured in the field Software selects appropriate excitation current and signal gain levels when sensor type is entered via the instrument front panel Temperature Control The Model 331E offers one and the Model 331S offers two proportional integral derivative PID control loops A PID control algorithm calculates control output based on temperature setpoint and feedback from the control sensor Wide tuning parameters accommodate most cryogenic cooling systems and many small high temperature ovens Control output is generated by a high resolution digital to analog converter for smooth continuous control The user can set the PID values or the Autotuning feature of the Model 331 can automate the tuning process Heater output for Model 331S and Model 331E is a well regulated variable DC current source Heater output is optically isolated from other circuits to reduce interference and ground loops Heater output can provide up to 50 W of continuous power to a resistive heater load and includes two lower ranges for systems wi
5. from each input and Model 331 Temperature Controller Curve Entry the control setpoint can be expressed in any combination of temperature or sensor units with heater output expressed as a percent of full scale current or power Sensor Selection Sensor Temperature Range sensors sold separately Diodes Silicon Diode Silicon Diode Silicon Diode Silicon Diode Silicon Diode Silicon Diode GaAlAs Diode GaAlAs Diode GaAlAs Diode Positive Temperature Coefficient RTDs Negative Temperature Coefficient RTDs 100 Platinum 100 Platinum Rhodium lron Rhodium lron Cernox Cernox Cernox Cernox Cernox Germanium Germanium Carbon Glass Carbon Glass Carbon Glass Rox Thermocouples www lakeshore com Type K Type E Chromel AuFe 0 07 Lake Shore Cryotronics Inc Useful range Magnetic field use DT 670 SD 14Kto500K T 60K amp B lt 3T DT 670E BR 30 K to 500 K DT 414 1 4 K to 375 K DT 421 1 4 K to 325 K DT 470 SD DT 471 SD T6 120 P T6 120 PL T6 120 80 PT 102 3 PT 111 14 K to 673 K RF 800 4 RF 100T U CX1010 CX1030 HT CX1050 HT CX 0704 eX1080 HT GR 300 AA GR 1400 AA CGR 1 500 CGR 1 1000 CGR 1 2000 RXCT02A 9006 006 9006 004 9006 002 1 2 K to 610 K 614 891 2244 fax 614 818 1600 Flexible Configuration Reading locations can be configured by the user to meet
6. mK 21 mK 500 Full Scale with 1 4J 77K 20 38 O 0 423 Q K 4 8 mK 15 mK 27 mK 9 6 mK calibration 300 K 110 350 0 387 Q K 5 2 mK 39 mK 62 mK 10 4 mK 500 K 185 668 Q 0 378 Q K 5 3 mK 60 mK 106 mK 10 6 mK Cernox CX 1050 SD HT 4 2K 3507 2 Q 1120 8 Q K 36 uK 1 4 mK 6 4 mK 72 uK with 4M VAK 205 67 Q 2 4116 Q K 16 6 mK 76 mK 92 mK 33 2 mK calibration 300 K 59 467 Q 0 1727 Q K 232 mK 717 mK 757 mK 464 mK 420 K 45 030 Q 0 0829 Q K 483 mK 1 42 K 1 49 K 966 mK Germanium GR 300 AA 1 2K 600 Q 987 Q K 51 uK 345 uK 4 5 mK 101 uK with 0 3D 1 4K 449 Q 581 Q K 86 uK 481 uK 4 7 mK 172 uK calibration 4 2 K 940 27 Q K 1 9 mK 52 mK 10 2 mK 3 8 mK 100 K 3Q 0 024 Q K 2 1K 4 25 K 4 27 K 4 20 K Germanium GR 1400 AA 4K 1873 Q 1008 Q K 50 uK 842 uK 5 0 mK 99 uK with 1 4D 4 2K 1689 Q 862 Q K 58 uK 900 uK 5 1 mK 116 uK calibration 10K 253 O 62 Q K 807 uK 3 2 mK 8 2 mK 1 64 mK 100 K 30 0 021 Q K 2 4K 4 86 K 4 884 K 4 81 K Carbon Glass CGR 1 2000 4 2K 2260 Q 2060 Q K 20 uK 0 5 mK 4 5 mK 40 uK with 4L 77K 21 65 Q 0 157 Q K 255 mK 692 mK 717 mK 510 mK calibration 300 K 11 990 0 015 Q K 2 667 K 7 K 7 1K 5 334 K Thermocouple Type K 75K 5862 9 uV 15 6 uV K 26 mK HOKE Calibration not 52 mK 50 mV 300 K 1075 3 uV 40 6 uV K 10 mK 0 038 K available from 20 mK 600 K 13325 uV 41 7 uV K 10 mK 0 184 K Lake Shore 20 mK 1505 K 49998 3 uV 36 006 uV K 12 mK seo Ke 24 mK Typical sensor sensitivities were taken from
7. representative calibrations for the sensor listed 8Control stability of the electronics only in an ideal thermal system Non HT version maximum temperature 325 K Accuracy specification does not include errors from room temperature compensation www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Model 331 Temperature Controller Specifications Input Specifications Sensor temperature coefficient Measurement resolution Input range Excitation current Display resolution Electronic control stability Electronic accuracy Diode OVto25V 10yA 0 05 100 pV 10 uV 80 uV 0 005 of rdg 20 uV negative 0 Vto7 5V 10 uA 0 05 3 100 uV 20 uV 80 uV 0 01 of rdg 40 uV PTC RTD positive 09 to 500 Q 1 mA 10 mQ 2mQ 0 004 Q 0 01 of rdg 4 mQ positive 0 Q to 5000 Q 1 mA 20 mQ 0 04 Q 0 02 of rdg NTC RTD negative 0 Q to 7500 Q 10 uA 0 05 40 MOQ 0 1 Q 0 04 of rdg Thermocouple positive 25 mV N 0 4 uV 1 uV 0 05 of rdg 1 uV 0 05 of rdg A v 11 Control stability of the electronics only in an ideal thermal system 1 Current source error has negligible effect on measurement accuracy 73 Diode input excitation current can be set to 1 mA refer to the Model 331 user manual for details 0 8 uV Current source error is removed during calibration 13 Accuracy specification does not include errors from room temperature compensation Control Co
8. 100 Instruments 331S Features Operates down to 1 2 K with appropriate sensors mM Two sensor inputs Supports diode RTD and thermocouple sensors mM Sensor excitation current reversal eliminates thermal EMF errors in resistance sensors Two autotuning control loops 50 W and 1 W E TEEE 488 and RS 232C interfaces analog outputs and alarm relays 331E Features mM Same as 331S except IEEE 488 interface relays analog output and a second control loop are not included www lakeshore com Lake Shore Cryotronics Inc Model 331 Temperature Controller Model 331 Temperature Controller Toimia Tune amea Product Description The Model 331 temperature controller combines the easy operation and unsurpassed reliability of the Model 330 with improved sensor input and interface flexibility including compatibility with negative temperature coefficient NTC resistance temperature detectors RTDs Backed by the Lake Shore tradition of excellence in cryogenic sensors and instrumentation the Model 331 temperature controller sets the standard for mid price range temperature control instruments The Model 331 temperature controller is available in two versions The Model 331S is fully equipped for interface and control flexibility The Model 331E shares measurement and display capability with the Model 331S but does not include the IEEE 488 interface relays analog voltage output or a second
9. ance Heater range Low Med High Low Med High Low Med High Heater resistance Heater power Front Panel Display 2 line by 20 character 9 mm character height vacuum fluorescent display Number of reading displays 1 to 4 Display units K C V mV Q Reading source Temperature sensor units max min and linear equation Display update rate All readings twice per s Temp display resolution 0 001 from 0 to 99 999 0 01 from 100 to 999 99 0 1 above 1000 Sensor units display resolution Sensor dependent to 5 digits Other displays Setpoint Heater Range and Heater Output user selected Setpoint setting resolution Same as display resolution actual resolution is sensor dependent Heater output display Numeric display in percent of full scale for power or current Heater output resolution 1 Display annunciators Control Input Remote Alarm Tuning Ramp Max Min Linear Keypad 20 full travel keys numeric and specific functions Front panel features Front panel curve entry display brightness control keypad lock out Interface IEEE 488 interface 331S Features SH1 AH1 T5 L4 SR1 RL1 PPO DC1 DTO CO E1 Reading rate To 10 readings per s on each input Software support LabVIEW driver consult factory for availability Serial interface Electrical format RS 232C Max baud rate 9600 baud Connector 9 pin D sub Reading rate To 10 readings s on each input at 9600 baud Special interface features M
10. application needs The character preceding the reading indicates input A or B or setpoint S The character following the reading indicates measurement units or the math function in use E ENTEN Pee REA LELI LEL an ae a an an a a E EHEN an an E Li E E LLLI T 8 E oT ee af E amp in LL i E SEES HEIN on Ea i L E a a E ENTEN E ity m E E 7 H E E The Model 331 display offers the flexibility to support curve SoftCal and zone entry Curve entry may be performed accurately and to full resolution via the display and keypad as well as computer interface Silicon diodes are the best choice for general cryogenic use from 1 4 K to above room temperature Diodes are economical to use because they follow a Standard curve and are interchangeable in many applications They are not suitable for use in ionizing radiation or magnetic fields Cernox thin film RTDs offer high sensitivity and low magnetic field induced errors over the 2 K to 420 K temperature range Cernox sensors require calibration Platinum RTDs offer high uniform sensitivity from 30 K to over 800 K With excellent reproducibility they are useful as thermometry standards They follow a standard curve above 70 K and are interchangeable in many applications Single excitation current may limit the low temperature range of NTC resistors 3 Non HT version maximum temperature 325 K Low temperature limited by input resistance range gt
11. libration with certificate Instrument recalibration with certificate and data Kit for mounting one 1 2 rack temperature controller in a 482 6 mm 19 in rack 90 mm 3 5 in high Kit for mounting two 1 2 rack temperature controllers in a 482 6 mm 19 in rack 135 mm 5 25 in high EXPRESS m 8001 331 8002 05 331 CAL 331 CERT CAL 331 DATA RM 2 RM 2 fax 614 818 1600 e mail info lakeshore com
12. ntrol loops Control type Tuning Control stability Thermometry Number of inputs 2 Input configuration Each input is factory configured for either diode RTD or thermocouples Sensor inputs optically isolated from other circuits but not each other A D resolution 24 bit Input accuracy Sensor dependent refer to Input Specifications table Measurement resolution Sensor dependent refer to Input Specifications table Maximum update rate 10 readings s on each input except 5 readings s on input A when configured as thermocouple Room for twenty 200 point CalCurves or user curves Two on 3315 one on 331E Closed loop digital PID with manual heater output or open loop Autotune one loop at a time PID PID zones Sensor dependent to 2x measurement resolution in an ideal thermal system Isolation PID control parameters Proportional gain 0 to 1000 with 0 1 setting resolution Integral reset 1 to 1000 1000 s with 0 1 setting resolution Derivative rate 1 to 200 with 1 resolution User curves Manual output 0 to 100 with 0 01 setting resolution softCal Improves accuracy of DI 470 diode to 0 25 K Zone control 10 temperature zones with P D manual heater out from 30 K to 375 K improves accuracy of Platinum RTDs to and heater range 0 25 K from 70 K to 325 K stored as user Curves Setpoint ramping 0 1 K min to 100 K min Math Maximum Minimum and Linear Equation Mx B or M x B Safety limits Curve tem
13. odel 330 command emulation mode Alarms Number 4 high and low for each input Data source Temperature Sensor Units Linear Equation Settings Source High Setpoint Low Setpoint Deadband Latching or Non Latching Audible On Off Actuators Display annunciator beeper relays Relays 3319 Number 2 Contacts Normally Open NO Normally Closed NC and Common C Contact rating 30 VDC at 5 A Operation Activate relays on high low or both alarms for either input or manual Connector Detachable terminal block Analog voltage output 331S Scale User selected Update rate 10 readings per s Data source Temperature Sensor Units Linear Equation Settings Input source top of scale bottom of scale or manual Range 10V Resolution 0 3 mV Accuracy 2 5 mV Min load resistance 100 short circuit protected www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 General Ambient temperature 15 C to 35 C at rated accuracy 10 C to 40 C at reduced accuracy Power requirement 100 120 220 240 VAC 6 10 50 or 60 Hz 120 VA Size 216mm W x 89 mm H x 368 mm D 8 5 in x 3 5 in x 14 5 in half rack 4 8 kg 10 5 Ib CE mark Weight Approval Ordering Information Part number Description Standard temperature controllers all features included 3319S Two diode resistor inputs 331S T1 One diode resistor input one thermocouple input 331S T2 Two thermocouple inputs Economy temperature controllers a l feat
14. perature power up heater off short circuit protection Filter Averages 2 to 64 input readings Sensor Input Configuration Heater Output Diode RTD Loop 1 Loop 2 Variable DC current source Variable DC voltage source Thermocouple Heater output type Measurement type 4 lead differential 2 lead room temperature compensated Heater output D A resolution 18 bit 16 bit ae Max heater power 50 W Excitation Constant current with current NA Max heat inut iA reversal for RIDs aX NC AEr CWRU eurre Heater output compliance 50 V Supported sensors Diodes Silicon GaAlAs Most thermocouple types Heater output ranges 3 decade steps in power RTDs 100 Q Platinum Heater load t Resisti 1000 Q Platinum eater load type esistive esis ve Germanium Carbon Glass Heater load range 10 Q to 100 Cernox and Rox recommended Heater load for max power 500 Standard curves DT 470 DI 500D DI 670 Type E Type K Type T PT 100 PT 1000 AuFe 0 07 vs Cr Heater noise lt 1 kHz RMS 50pV mle of output RX 102A RX 202A AuFe 0 03 vs Cr ieee Input connector 6 pin DIN www lakeshore com Lake Shore Cryotronics Inc Ceramic isothermal block Heater connector 614 891 2244 Isolation None Detachable terminal block Optical isolation between output and other circuits Dual banana fax 614 818 1600 e mail info lakeshore com Model 331 Temperature Controller Loop 1 Full Scale Heater Power at Typical Resist
15. th less cooling power Heater output is short circuit protected to prevent instrument damage if the heater load is accidentally shorted Interface Features of Model 331S and Model 331E 3315 331E Numeric keypad E a Front panel curve entry Alarms RS 232C interface IEEE 488 interface Second control loop Analog voltage output Two relays Feature www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 The setpoint ramp feature allows smooth continuous changes in setpoint and can also make the approach to a setpoint temperature more predictable The zone feature can automatically change control parameter values for operation over a large temperature range Values for ten different temperature zones can be loaded into the instrument which will select the next appropriate value on setpoint change Interface The Model 331 is available with both parallel IEEE 488 331S only and serial RS 232C computer interfaces In addition to data gathering nearly every function of the instrument can be controlled via computer interface Also included is a Model 330 command emulation mode that makes the Model 331 interchangeable with the older Model 330 in software controlled systems Each input has a high and low alarm which offer latching and non latching operation The two relays on the Model 331S can be used in conjunction with the alarms to alert the operator of a fault condition or perform simple on off control Relays can be
16. ures of the 331S are included except IEEE 488 interface relays analog voltage output and a second control loop 331E Two diode resistor inputs 331E T1 One diode resistor input one thermocouple input 331E T2 Two thermocouple inputs Select a power configuration VAC 100 Instrument configured for 100 VAC with U S power cord VAC 120 Instrument configured for 120 VAC with U S power cord VAC 120 ALL Instrument configured for 120 VAC with U S power cord and universal Euro line cord and fuses for 220 240 VAC setting Instrument configured for 220 VAC with universal Euro line cord Instrument configured for 240 VAC with universal Euro line cord Other country line cords available consult Lake Shore VAC 220 VAC 240 Accessories included 106 009 Heater output connector dual banana jack G 106 233 Sensor input mating connector 6 pin DIN plug 2 included 106 739 Terminal block 8 pin Calibration certificate MAN 331 Model 331 user manual Options and accessories 4005 1 m 3 3 ft long IEEE 488 GPIB computer interface cable assembly includes extender required for simultaneous use of IEEE cable and relay terminal block CalCurve factory installed the breakpoint table from a calibrated sensor stored in the instrument extra charge for additional sensor curves CalCurve field installed the breakpoint table from a Calibrated sensor loaded into a nonvolatile memory for customer installation Instrument reca
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