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1. 325K 2 420K 2 40K 3 40K 110 325 K Thermocouples Type K Type E Type T Chromel AuFe 0 07 9006 006 9006 004 9006 008 9006 002 Single excitation current may limit the low temperature range of NTC resistors Sensors sold separately 3 2 1500 K 3 2 930 K 3 2 670K 1 4 610K Model 331S Rear Panel Connections 1 Line input assembly 2 Serial I O interface 3 Heater output 4 Sensor input connectors 5 Terminal block for relays and analog output 6 IEEE 488 interface Interface Features of Models 331S and 331E Feature 331S 331E Numeric keypad A Front panel curve entry 2 Alarms 5 a Serial interface IEEE 488 interface Two control loops Analog voltage output Relays Autotuning The Model 331S and 331E autotuning feature automates the tuning process With its own measurements of system characteristics and based on characteristics of typical cryogenic systems the autotuning function computes proportional integral and derivative setting values On the Model 331S the autotune function tunes one control loop at a time Because setting an inappropriate heating range is potentially dangerous to some loads the Model 331S and 331E autotuning feature does not attempt to automate that step of the tuning process SoftCal Lake Shore s SoftCal algorithm for silicon diode and platinum RTD sensors is a good solution for applications that need more accuracy than a standard sensor curve
2. but not traditional calibration SoftCal uses the predictability of a standard curve to improve an individual sensor s accuracy around a few known temperature reference points Both versions of the Model 331 generate SoftCal curves 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 and 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 4123 45 A 123 45 45 Med The two line by twenty character vacuum fluorescent display provides four reading locations Readings from each input and 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 for the selected heater range A 123 45 Flexible Configuration 123 45 A 123 45 gt A 123 45 A 123 45 lt Reading locations can be configured by the user to meet application needs This example shows the live reading from input A the c
3. A Hasta Hgraje urn Tare Eyra ibe Farnei inpri O apky Sali SOT diarm rr Prape pae la CO Arca 35 Gel ELLEGI Erin oP ao Maras Cel fe smooth continuous control The first control loop drives heater output Both versions also include manual control mode Heater output for the Models 331S and 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 as resistive heater load and includes two lower ranges for systems with less cooling power Heater output is short circuit protected to prevent instrument damage if the heater load is accidentally shorted 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 Model 331E is equipped with a serial RS 232C interface while Model 331S includes serial RS 232C and parallel IEEE 488 interfaces Maximum reading rate can be achieved with either interface The most frequently used functions can be accomplished from the instrument front panel with one or two keystrokes
4. DIN Ceramic isothermal block Isolation Sensor inputs optically isolated from other circuits but not each other A D Resolution 24 bit Input Accuracy Sensor dependent see Sensor Input Performance chart Measurement Resolution See Sensor Input Performance chart Maximum Update Rate 10 readings s on each input except 5 readings s on input A when configured as thermocouple User Curves Room for 20 200 point CalCurves or user curves SoftCal Improves accuracy of DT 470 diode to 0 25 K from 30 K to 375 K Improves accuracy of Platinum RTDs to 0 25 K from 70 K to 325 K Stored as user curves Math Maximum Minimum and Linear Equation Mx B or M x B Filter Averages 2 to 64 input readings Control Control Loops 2 on 331S 1 on 331E Control Type Closed loop digital PID with Manual Heater or open loop Tuning AutoTune one loop at a time PID PID zones Control Stability Sensor dependent see Sensor Input Performance chart PID Control Parameters Proportional Gain 0 1000 with 0 1 setting resolution Integral Reset 1 1000 1000 s with 0 1 setting resolution Derivative Rate 1 200 with 1 resolution Manual Heater 0 100 with 0 01 setting resolution Zone Control 10 temperature zones with P I D Manual Heater and Heater Range Setpoint Ramping 0 1 to 100 K min Protection Curve temperature limits power up heater off short circuit protection Loop 1 Loop 2 Heater Output Type Variable DC current source Vari
5. Model 331 Temperature Controllers Two sensor inputs Supports diodes NTC PTC RTDs and thermocouples Current reversal for NTC PTC RTDs Two control loops IEEE 488 and RS 232 interfaces Giri nid Erith Sahu Son a e Alarms relays and analog voltage EN output r iB e Autotuning e Model 330 command emulation mode Product Description Intelligently designed and well integrated for high performance and ease of use the Model 331 Temperature Controllers are suitable for most cryogenic and many higher temperature measurement and control applications The Model 331 Temperature Controllers combine the easy operation and unsurpassed reliability of the Model 330 with improved sensor input and interface flexibility including compatibility with negative temperature coefficient NTC RTDs Backed by Lake Shore s tradition of excellence in cryogenic sensors and instrumentation the Model 331 Temperature Controllers set the standard for mid price range temperature control instruments The Model 331 Temperature Controllers are available in two versions The Model 3318S 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 control loop The purchaser s choice of Model 331S or 331E must be specified at time of order and cannot be reconfigured in the field Sensor Inputs The M
6. Nearly every function on the instrument front panel can also be performed via computer interface Both versions include Model 330 command emulation mode for drop in interchangeability with Model 330 temperature controllers in existing systems High and low alarms for each input can be used in latching mode requiring user intervention before alarms reset For the Model 331S alarms can also be used in conjunction with relays in non latching mode where alarms automatically reset when the activation condition ends to perform simple on off control functions Relay assignments are configurable so that one relay may be assigned to each input or both assigned to a single input for high low control The Model 331S s analog voltage output 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 any other application Model 331 Sensor Input Performance Sensor Type Silicon Diode GaAlAs Diode 100 Q Platinum RTD 1000 Q Platinum Thermox 500 Full scale RTD Negative Negative Positive Negative Negative Negative Sensor Selection Guide For more information see Lake Shore s Temperature Measurement and Control Catalog Carbon Glass Cernox Thermocouple Thermocou
7. able DC voltage source Heater Output D A Resolution 18 bit 16 bit Max Heater Power 50 W 1 W Max Heater Output Current 1A 0 1A Heater Output Compliance 50 V 10 V Heater Output Ranges 3 decade steps in power 1 Heater Load Type Resistive Resistive Heater Load Range 10 Q to 100 Q recommended 100 Q minimum Heater Load for Max Power 50 Q 100 Q Heater Noise lt 1 KHZ RMS 50 uV 0 01 of output voltage lt 0 3 mV Isolation Optical isolation between None output and other circuits Heater Connector Dual banana Detachable terminal block Loop 1 Full Scale Heater Power at Typical Resistance Heater Resistance ge Low 100 mW 10 Q Med 1 W High 10 W o W Low 250 mW Med 2 5 W 25 W 500 mW 5 W 50 W 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 second Temperature Display Resolution 0 001 between 0 99 999 0 01 between 100 999 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 Resolu
8. es extender required for simultaneous use of IEEE cable and relay terminal block RM 1 2 Rack mount kit for mounting one 1 2 rack temperature controller in 482 60 mm 19 rack 90 mm 3 5 high RM 2 Rack mount kit for mounting two 1 2 rack temperature controllers in 482 60 mm 19 rack 135 mm 5 25 high ee fal akeShore Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville Ohio 43082 Tel 614 891 2244 Fax 614 818 1600 E mail sales lakeshore com www lakeshore com Specifications subject to change without notice Lake Shore Cryotronics Inc 3310 2 00
9. mK at 77 K 180 mK at 300 K 123 mK at 475 K 24 1 mK at 4 2 K 238 mK at 20 K 705 mK at 40 K 32 mK at 105 K 171 mK at 200 K 2 800 K at 300 K 7 mK at 4 2 K 1 138 K abr K 11 46 K at 300 K 80 MQ 1 mK at4 2 K 816 mK at 77 K 8 510 K at 300 K 4 mQ 22 mK at 30 K 9 5 mK at 77 K 10 mK at 300 K 11 mK at 800 K 40 mQ 22 mK at 30 K 9 5 mK at 77 K 10 mK at 300 K 12 mK at 800 K 80 MQ 1 mK at 4 2 K 20 mK at 20 K 76 mK at 40 K 80 mQ 1mK at 105 K 96 mK at 200 K 2 162 K at 300 K 40 uV 0 2 mK at 4 2 K 32 mK at 77 K 14 mK at 300 K 13 mK at 475 K Recommended for T gt 2K amp B lt 19T Recommended for Not Recommended T gt 2K amp B lt 10T Recommended for T gt 40K amp B lt 25T Recommended for T gt 40K amp B lt 25T Recommended for T gt 42K amp B lt 5T 2 Typical sensor sensitivities were taken from representative calibrations for the sensor listed 3 Accuracy specification does not include errors from room temperature compensation The Diode RTD input configuration is compatible with most diode and negative and positive temperature coefficient RTDs Current reversal eliminates thermal EMF voltage errors for resistor sensors the field Software selects appropriate excitation current and signal gain levels when sensor type is entered via the instrument front panel 2290 Q K at 4 2K 2 15 QK at 77K 0 131 QK at 300K 40 MQ lt 1 mK at 4 2 K 18 6 mK a
10. odel 331 Temperature Controllers are designed for high performance with sensors across the 1 4 to over 1000 K temperature range and in difficult sensing conditions including magnetic fields The Model 331 Temperature Controllers feature 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 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 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 Temperature Control The Model 331E offers one and Model 331S 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 4 ha amp Pill Fee T Camil E Hina Qaim cI
11. ollow a standard curve above 70 K and are interchangeable in many applications but are not useful at cryogenic temperatures below 20 K CGR 1 500 with 1 4L calibration Standard Curve Requires calibrated sensor Requires calibrated sensor Rhodium lron RTDs offer high stability and high resistance to ionizing radiation across a Typical Sensor Sensitivity Measurement Resolution Sensor Units Temperature Equivalents Electronic Accuracy Sensor Units Temperature Equivalents Temperature Accuracy including electronic accuracy CalCurve and Calibrated sensor Control Stability Sensor Units Temperature Equivalents Magnetic Field Use 33 6 mV K at 4 2 K 1 9 mV K at 77 K 2 4 mV K at 300 K 2 2 mV K at 475 K 10 uV 0 3 mK at 4 2 K 5 5 mK at 77 K 4 2 mK at 300 K 4 5 mK at 475 K 80 uV 0 005 RDG 5 mK at 4 2 K 70 mK at 77 K 45 mK at 300 K 40 mK at 475 K 26 mK at 4 2 K 125 mK at 77 K 105 mK at 300 K 100 mK at 475 K 20 uV 0 6 mK at 4 2 K 11 mK at 77 K 8 4 mK at 300 K 9 mK at 475 K Recommended for T gt 60K amp B lt 3T 1 No longer available from Lake Shore Factory Configured Inputs 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 o
12. ontrol setpoint and maximum and minimum readings captured by the instrument s math feature Character preceding the reading indicates input A or B or setpoint S Character following the reading indicates measurement units or the math function in use Curve Entry 40 09062V i 0 10191v 470 0007 The Model 331 display offers the flexibility to support curve SoftCal and zone entry Although less expedient than curve entry viacomputer interface curve entry may be performed accurately and to full resolution viathe display and keypad as shown 415 0007 Parameter Entry Enter for Loop 1 123 45 Fields for parameter entry are accessed via the keypad and display This example shows the parameter entry prompt for the first control loop setpoint with setpoint units in Kelvin Setpoint MOQEI 351 OPeCITICATlONsS Thermometry Number of Inputs 2 Input Configuration Each input is factory configured for either diode RTD or thermocouple Diode RTD Thermocouple Measurement Type Four lead differential Two lead room temperature with current reversal compensated Excitation Constant current NA Supported Sensors Diodes Silicon GaAlAs Most thermocouple types RTDs 100 Q Platinum 1000 Q Platinum Germanium Carbon Glass Cernox Rox Thermox Standard Curves DT 470 DT 500D DT 600 Type E Type K Type T PT 100 PT 1000 RX 102A AuFe 0 07 Vs CH AuFe 0 03 Vs CH RX 202A Input Connector 6 pin
13. ple 25 mV 50 mV Positive Input Range 0 2 5V 0 7 5V 0 500 Q 0 5000 Q Sensor Excitation Constant Current with Silicon diodes are the best choice for general cryogenic use from 1 4 K to above room temperature Economical to use because they follow a standard curve and are interchangeable in many applications silicon diodes are not suitable for use in ionizing radiation or magnetic fields 0 7500 Q 0 7500 Q 0 7500 Q 10 pA 0 05 10 pA 0 05 10 pA 0 05 Not applicable Not applicable GaAlAs diodes offer high sensitivity from 1 4 K to above room temperature with better sensitivity than silicon diodes at temperatures below 25 K They are useful in moderate magnetic fields GaAlAs diodes require calibration Current Reversal 1ouasoos 10pA 20105 1m Display Resolution 100 uV 10mQ 1 Q 1 Q 1 Q Sensor Units aes H m 00m 00m 00m Example LSCI sensor DT 470 C0 13 with TG 120 SD with PT 103 with PT 1001 with RX 102A AA with 0 3E TX 104 GB with 70L 1 4H calibration 1 4H calibration 14 calibration 1 4G calibration calibration calibration LSCI Curve 10 Requires calibrated DIN 43760 Scaled from DIN 43760 Requires calibrated Requires calibrated sensor sensor sensor 10 WA 0 05 CX 1050 SD with 1 4L Chromel AuFe 0 07 Type K calibration By type By type 100mQ Platinum RTDs offer high uniform sensitivity from 30 to over 800 K with excellent reproducibility they are useful as thermometry standards They f
14. rder and cannot be reconfigured in 0 19 Q K at 30 K 0 42 Q K at 77K 0 39 Q K at 300 K 0 36 Q K at 800 K 1 9 Q K at 30 K 4 2 Q K at77K 3 9 Q K at 300 K 3 6 Q K at 800 K 210 mV K at 4 2 K 1 25 mV K at 77 K 2 85 mV K at 300 K 3 15 mV K at 475 K 485 Q K at 105 K 0 84 Q K at 200 K 0 037 Q K at 300 K 422 3 Q K at 4 2 K 0 098 Q K at 77 K 0 00940 K at 300 K 80 Q K at 4 2 K 4 Q K at 20 K 1 06 Q K at 40 K 20 MQ 11 mK at 30 K 4 8 mK at77K 5 2 mK at 300 K 5 6 mK at 800 K 40mQ lt l mK at 105 K 48 mK at 200 K 1 081K at 300 K 40mQ lt 1 mK at 4 2 K 408 mK at 77 K 4 255 K at 300 K 20 uV 2 MQ 0 1 mK at 4 2 K 10 6 mK at 30 K 16 0 mK at 77 K 4 8 mK at77K 7 1 mK at 300 K 5 2 mK at 300 K 6 3 mK at 475 K 5 6 mK at 800 K 40mQ lt 1 mK at 4 2 K 10 mK at 20 K 38 mK at 40 K 80 UV 0 01 RDG 0 004 Q 0 01 RDG 0 04 2 0 02 RDG 0 10 0 04 RDG 0 102 0 04 RDG 0 10 2 0 04 RDG 25 mK at 30 K 19 mK at 77 K 67 mK at 300 K 172 mK at 800 K lt l mK at 4 2 K 1 078 K at 77K 11 00 K at 300 K 8 1 mK at 4 2 K 134 mK at 20 K 491 mK at 40 K 3 mK at 4 2 K 180 mK at 77 K 60 mK at 300 K 38 mK at 475 K 23 mK at 30 K 14 mK at 77K 39 mK at 300 K 95 mK at 800 K 4 8 mK at 105 K 131 mK at 200 K 2 729 K at 300 K 48 mK at 30 K 39 mK at 77 K 84 mK at 300 K 195 mK at 800 K 50 mK at 30 K 44 mK at 77 K 112 mK at 300 K 272 mK at 800 K 20 mK at 4 2 K 255
15. resistance to strong magnetic fields and ionizing radiation Sensitivity decreases at higher temperatures Cernox sensors require calibration Rox RTD thick film sensors are useful in low temperature applications in magnetic fields with a very low incidence of magnetic field errors Each model adheres to a single resistance versus temperature curve The Rox Models RX 102A and RX 202A are useful to temperatures as low as 50 mK with accuracy to within 5 mK at 50 mK the RX 202A also offers an upper temperature range to 300 K Thermocouples offer uniform sensitivity over a wide temperature range and measure the highest temperatures possible with the Model 331 Temperature Controllers While many types are inexpensive and standard curves are available thermocouples are less accurate than other sensors repeatability is highly dependent upon installation Model 331 Temperature Range with Lake Shore Sensors Model DT 470 TG 120 Diodes Silicon Diode GaAlAs Diode Useful Range 1 4 475K 1 4 475K Positive Temperature Coefficient RTDs 100 Q Platinum Rhodium lron PT 100 RF 800 4 30 800 K 1 4 400 K Negative Temperature Coefficient RTDs Germanium Germanium Carbon Glass Cernox Cernox High Temperature Cernox Rox Rox Thermox GR 200A 1000 GR 200A 250 CGR 1 500 CX 1050 AA or SD CX 1030 AA or SD CX 1030 AA or SD RX 102A RX 202A TX 104 GB 2 100K 1 2 40K 3 325K 3 5 325 K 2
16. rotected General Ambient Temperature 15 35 C at rated accuracy 10 40 C at reduced accuracy Power Requirement 100 120 220 240 VAC 5 10 50 or 60 Hz 120 VA Size 217 mm W x 90 mm H x 317 mm D 8 5 x 3 5 x 14 5 half rack Weight 4 77 kg 10 5 Ibs Ordering Information Part number Description Input configuration cannot be changed in the field Standard Temperature Controllers all features included 331S Two Diode Resistor Inputs 331S T1 One Diode Resistor Input One Thermocouple Input 331S T2 Two Thermocouple Inputs Economy Temperature Controllers all features 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 Accessories included 115 006 Detachable 120 VAC line cord 106 233 Sensor input mating connector 6 pin DIN plugs 106 009 Heater output connector dual banana jack 106 739 Terminal block 8 pin MAN 331 User s manual Options 8001 CalCurve Factory Installed Consists of the breakpoint table from a calibrated sensor stored in the instrument 8002 05 CalCurve Field Installed Consists of the breakpoint table from a calibrated sensor loaded into a nonvolatile memory for customer installation Accessories available 4005 1 meter 3 3 long IEEE 488 GPIB computer interface cable assembly Includ
17. t 77 K 305 mK at 300 K 0 10 Q 0 04 RDG 1 mK at 4 2 K 77 mK at 77K 881 mK at 300 K 8 mK at 4 2 K 127 mK at 77 K 1 031 K at 300 K 80 MQ 1mK at 4 2 K 38 mK at 77 K 610 mK at 300 K Recommended for T gt 2K amp B lt 19T 12 6 uV K at 4 2 K 22 4 uV K at 300 K 0 4 uV 32 mK at 4 2 K 18 mK at 300 K 3 1 uV 0 05 RDG 288 mK at 4 2 K 58 mK at 300 K Calibration not available from Lake Shore 0 8 uV 64 mK at 4 2 K 36 mK at 300 K Recommended for T gt 2K amp B lt 19T 0 92 uV K at 4 2 K 40 uV K at 300 K 36 uV K at 1500 K 0 4 uV 435 mK at 4 2 K 10 mK at 300 K 11 mK at 1500 K 3 1 uV 0 05 RDG 4 6 K at 4 2K 38 mK at 300K 722 mK at 1500K Calibration not available from Lake Shore 0 8 uV 870 mK at 4 2 K 20 mK at 300 K 22 mK at 1500 K Not Recommended The Thermocouple input configuration is compatible only with thermocouple sensors Room temperature compensation is included for any type of thermocouple in use Appropriate temperature response curves for many types of thermocouples are included temperature response curves may be entered as user curves for other thermocouples wide temperature range from 1 4 to 400 K with a linear response above 100 K They are not recommended for use in magnetic fields below 77 K Rhodium lron RTDs require calibration Cernox and High Temperature Cernox RTDs offer excellent sensitivity at low cryogenic temperatures with
18. tion 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 s on each input Software Support LabView driver consult factory for availability Serial Interface Electrical Format RS 232C Max Baud Rate 9600 BAUD Connector DE 9 Reading Rate To 10 readings s on each input at 9600 baud Special Interface Features Model 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 331S Number 2 Contacts Normally Open NO Normally Closed NC and Common C Contact Rating 30 VDC at5A 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 second Data Source Temperature Sensor Units Linear Equation Settings Input source top of scale bottom of scale or manual Range 10 V Resolution 0 3 mV Accuracy 2 5 mV Minimum Load Resistance 100 Q short circuit p

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