Model 325 Temperature Controller
Contents
1. 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 614 891 2244 fax 614 818 1600 e mail info lakeshore com Temperature Control The Model 325 temperature controller offers two independent proportional integral derivative PID control loops A PID 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 A high resolution digital to analog converter generates a smooth control output The user can set the PID values or the Autotuning feature of the Model 325 can automate the tuning process Control loop 1 heater output for the Model 325 is a well regulated variable DC current source The output can provide up to 25 W of continuous power to a 50 Q or 25 Q heater load and includes a lower range for systems with less cooling power Control loop 2 heater output is a single range variable DC voltage source The output can source up to 0 2 A providing 2 W of heater power at the 50 Q setting or 1 W at the 25 Q setting When not being used for temperature control the loop 2 heater output can be used as a Manually controlled voltage source The output voltage can vary from2. to indicate which channel is being controlled by the displayed control loop Normal Default Display Configuration The 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 Flexible Configuration Reading locations can be configured by the user to meet application needs The character preceding the reading indicates input A or B or setpoint S The character following the reading indicates measurement units Curve Entry The Model 325 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 Model 325 Rear Panel Connections Loop 1 Heater Output O Serial RS 232C I O DTE Line Input Assembly Loop 2 Heater Output O Sensor Input Connectors O 1EEE 488 Interface 614 891 2244 fax 614 818 1600 e mail info lakeshore com Sensor Selection Sensor Temperature Range sensors sold separately Model Useful Range Magnetic Field Use Diodes Silicon Diode DT 670 SD 14Kto500K T gt 60K8B lt 3T Silicon Diode DT 670E BR 30Kto 500K T gt 60K8B lt 3T Silicon Diode DT 414 14Kto375K T gt 60K8B lt 3T Silicon Diode DT 421 1 4
3. 0 to 10V on the 50 Q setting or 0 to 5V on the 25 Q setting Both heater outputs are referenced to chassis ground The setpoint ramp feature allows smooth continuous setpoint changes and can also make the approach to setpoint more predictable The zone feature can automatically change control parameter values for operation over a large temperature range Ten different temperature zones can be loaded into the instrument which will select the next appropriate value on setpoint change www lakeshore com Lake Shore Cryotronics Inc Interface The Model 325 includes both parallel IEEE 488 and serial RS 232C computer interfaces In addition to data gathering nearly every function of the instrument can be controlled via computer interface Sensor curves can also be entered and manipulated through either interface using the Lake Shore curve handler software program Configurable Display The Model 325 offers a bright easy to read LCD 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 can be assigned to any of the four locations and the user s choice of temperature or sensor units can be displayed Heater range and control output as current or power can be continuously displayed for immediate feedback on control operation The channel A or B indicator is underlined
4. 100 uV 20 uV 80 uV 0 01 of rdg 40 uV PTC RTD positive 0 Q to 500 Q 1 mA 10 mQ 2 MQ 0 004 Q 0 01 of rdg 4 MQ positive 0 Q to 5000 Q 1 mA 100 mQ 20 mQ 0 04 Q 0 02 of rdg 40 mQ NTC RTD negative 0Qto 75000 10uA 0 05 100 mQ 40 mQ 0 1 Q 0 04 of rdg 80 mQ Thermocouple positive 25 mV NA 1 uV 0 4 uV 1 uV 0 05 of rdg 0 8 uV positive 50 mV NA 1 uV 0 4 uV 1 uV 0 05 of rdg 0 8 uV Control stability of the electronics only in an ideal thermal system 12 Current source error has negligible effect on measurement accuracy 13 Diode input excitation current can be set to 1 mA refer to the Model 325 user manual for details Thermometry Number of inputs 2 Input configuration Each input is factory configured for either diode RTD or thermocouple 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 rdg s on each input except 5 rdg s on input A when configured as thermocouple Room for 15 200 point CalCurves or user curves Isolation 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 Filter Averages 2 to 64 input readings Sensor Input Configuration
5. Diode RTD Thermocouple Measurement type 4 lead differential 2 lead room temperature compensated Excitation Constant current with NA current reversal for RTDs Supported sensors Diodes Silicon GaAlAs Most thermocouple types RTDs 100 Q Platinum 1000 Q Platinum Germanium Carbon Glass Cernox and Rox DT 470 DT 500D DT 670 PT 100 PT 1000 RX 102A RX 202A Type E Type K Type T AuFe 0 07 vs Cr AuFe 0 03 vs Cr Standard curves Input connector 6 pin DIN Ceramic isothermal block Control Control loops Control type Tuning Control stability Current source error is removed during calibration 15 Accuracy specification does not include errors from room temperature compensation 2 Closed loop digital PID with manual heater output or open loop Autotune one loop at a time PID PID zones Sensor dependent see Input Specification table PID control settings Setpoint ramping Safety limits Proportional gain 0 to 1000 with 0 1 setting resolution Integral reset Derivative rate 1 to 200 with 1 resolution Manual output Zone control 1 to 1000 1000 s with 0 1 setting resolution 0 to 100 with 0 01 setting resolution 10 temperature zones with P D manual heater out and heater range 0 1 K min to 100 K min Curve temperature power up heater off short circuit protection www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e ma
6. 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 Accessories included 106 009 106 233 106 735 MAN 325 Accessories available 6201 8001 325 CAL 325 CERT CAL 325 DATA RM 2 RM 2 Heater output connector dual banana jack Sensor input mating connector 6 pin DIN plugs Terminal block 2 pin Calibration certificate Model 325 user manual 1 m 3 3 ft long IEEE 488 GPIB computer interface cable assembly CalCurve factory installed the breakpoint table from a calibrated sensor stored in the instrument extra charge for additional sensor curves Instrument recalibration 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 All specifications are subject to change without notice www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Lake Shore Cryotronics Inc 575 McCorkle Boulevard Westerville OH 43082 8888 USA Tel 614 891 2244 Fax 614 818 1600 e mail info lakeshore com www lakeshore com Established in 1968 Lake Shore Cryotronics Inc is an international leader in developing innovative
7. measurement and control solutions Founded by Dr John M Swartz a former professor of electrical engineering at the Ohio State University and his brother David Lake Shore produces equipment for the measurement of cryogenic temperatures magnetic fields and the characterization of the physical properties of materials in temperature and magnetic environments
8. uK 0 3 mK 4 3 mK 8 uK with 1 4D 4 2 K 1054 Q 526 Q K 76 uK 1 mK 5 mK 152 uK calibration 10K 170 9 Q 38 4 Q K 1 mK 4 4 mK 9 4 mK 2 mK 100 K 2 257 Q 0 018 Q K 2 22 K 5 61 K 5 626 K 4 44 K Carbon Glass CGR 1 2000 4 2 K 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 17 mK 510 mK calibration 300 K 11 99 Q 0 015 Q K 2 667 K 7 K 1 K 5 334 K Thermocouple Type K 75K 5862 9 uV 15 6 uV K 26 mK 0 25 K Calibration not available 52 mK 50 mV 300 K 1075 3 uV 40 6 uV K 10 mK 0 038 K from Lake Shore 20 mK 600 K 13325 uV 41 7 u K 10 mK 0 184 K 20 mK 1505 K 49998 3 uV 36 006 uV K 12 mK 0 73 KV 24 mK 7 Typical sensor sensitivities were taken from representative calibrations for the sensor listed 8 Control stability of the electronics only in an ideal thermal system 2 Non HT version maximum temperature 325 K 1 Accuracy specification does not include errors from room temperature compensation o M www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Model 325 Specifications Input Specifications Sensor Temperature Coefficient Input Range Excitation Current Display Resolution Electronic Electronic Accuracy Control Stability Measurement Resolution Diode negative 0Vto2 5V 10 uA 0 05 2 13 100 uV 10 uV 80 uV 0 005 of rdg 20 uV negative 0 Vto 7 5 V 10 uA 0 05 2 13
9. Kto325K T260K amp B lt 3T Silicon Diode DT 470 SD 14Kto500K T gt 60K8B lt 3T Silicon Diode DT 471 SD 10Kto500K T gt 60K8B lt 3T GaAlAs Diode TG 120 P 14Kto325K T gt 42K amp B lt 5T GaAlAs Diode TG 120 PL 1 4Kto325K T gt 42K amp B lt 5T GaAlAs Diode TG 120 SD 14Kt0500K T gt 42K amp B lt 5T Positive Temperature 100 Q Platinum PT 102 3 14Kto873K T gt 40K amp B lt S25T Coefficient RTDs 100 Platinum PT 111 14Kto673K T gt 40K amp B lt 25T Rhodium Iron RF 800 4 14Kto500K T gt 77K amp B lt 8T Rhodium Iron RF 100T U 1 4Kto325K T gt 77K amp B lt 8T Negative Cernox CX 1010 2Kto325K T gt 2K amp B lt 19T Temperature Cernox CX 1030 HT 3 9 Kto 420 K T gt 2K8B lt 19T Coefficient RTDs Cernox CX 1050 HT 4K to 420 Ke T gt 2K amp B lt 19T Cernox CX 1070 HT 15 Kto 420K T gt 2K amp B lt 19T Cernox CX 1080 HT 50K to 420K T gt 2K8B lt 19T Germanium GR 200A B 1000 2 2 Kto 100 K Not Recommended Germanium GR 200A B 1500 2 6 Kto 100 K Not Recommended Germanium GR 200A B 2500 3 1 Kto 100 K Not Recommended Carbon Glass CGR 1 500 4Kto325K T gt 2K amp B lt 19T Carbon Glass CGR 1 1000 5Kto325K T gt 2K amp B lt S19T Carbon Glass CGR 1 2000 6Kto325K T gt 2K8B lt 19T Rox RX 102A 14Kto40K T gt 2K amp B lt 10T Thermocouples Type K 9006 006 3 2 K to 1505 K Not Recommended Type E 9006 004 3 2 K to 934K Not Recommended Chromel AuFe 0 07 9006 002 1 2Kto 610K Not Recommended Single excitation current may limit the low temperature rang
10. Model 325 Temperature Controller www lakeshore com LakeShore E Operates down to 1 2 K with appropriate sensor E Two sensor inputs E Supports diode RTD and thermocouple sensors E Sensor excitation current reversal eliminates thermal EMF errors in resistance sensors E Two autotuning control loops 25 W and 2 W maximum E Control loop 2 variable DC voltage source from 0 to 10 V maximum E EEE 488 and RS 232C interfaces www lakeshore com Lake Shore Cryotronics Inc Model 325 Introduction The Model 325 dual channel temperature controller is capable of supporting nearly any diode RTD or thermocouple temperature sensor Two independent PID control loops with heater outputs of 25 W and 2 W are configured to drive either a 50 Q or 25 2 load for optimal cryocooler control flexibility Designed with ease of use functionality and value in mind the Model 325 is ideal for general purpose laboratory and industrial temperature measurement and control applications Sensor Inputs The Model 325 temperature controller features two inputs with a high resolution 24 bit analog to digital converter and separate current sources for each input Constant current excitation allows temperature to be measured and controlled down to 2 0 K using appropriate Cernox RTDs or down to 1 4 K using silicon diodes Thermocouples allow for temperature measurement and control above 1 500 K Sensors are opticall
11. and 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 5391 V 97 5 mV K 0 2 mK 7 mK 19 mK 0 4 mK with 1 4H Mar 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 mK 21 mK 500 Full Scale with 1 4J 77K 20 38 Q 0 423 Q K 4 8 mK 15 mK 27 mK 9 6 mK calibration 300 K 110 35 Q 0 387 Q K 5 2 mK 39 mK 62 mK 10 4 mK 500 K 185 668 Q 0 378 Q K 9 3 mK 60 mK 106 mK 10 6 mK Cernox CX 1050 SD HT 4 2K 30 2 O 1120 8 Q K 36 uK 1 4 mK 6 4 mK 72 uK with 4M 77K 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 75 mK 464 mK 420 K 45 030 Q 0 0829 Q K 483 mK 1 42 K 1 49 K 966 mK Germanium GR 200A 1000 2K 6674 Q 9930 Q K 4
12. e of NTC resistors 3 Non HT version maximum temperature 325 K Low temperature limited by input resistance range 3 Low temperature specified with self heating error lt 5 mK 6 Low temperature specified with self heating error lt 12 mK 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 www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Typical Sensor Performance see Appendix F for sample calculations of typical sensor performance Electronic Control Stability Temperature Equivalents Electronic Accuracy Temperature Equivalents Measurement Resolution Temperature Equivalents Example Temp Lake Shore Sensor Voltage Nominal Typical Resistance Sensor Sensitivity Temperature Accuracy including Electronic Accuracy CalCurve
13. il info lakeshore com Loop 1 Heater Output 25 Q Setting 50 O Setting Loop 2 Heater Out put 25 Q Setting 50 Setting Type Variable DC current source Type Variable DC voltage source D A resolution 16 bit D A resolution 16 bit Max power 25 W Max power 1W 2 W Max current 1A 0 71 A Max voltage 5V 10 V Voltage compliance min 25 V 35 4 V Current compliance min 0 2 A Heater load range 200to2D0Q 40Qt0590Q Heater load range in 22950 2900 Heater load for max power 29 Q 00 Q Heater load for max power 29 Q 00 Q Ranges 2 29W 25W Ranges _ i Heater noise lt 1 kHz 1 uA 0 01 of output Heater noise lt 1 kHz 50 uV 0 01 of output Grounding Output referenced to chassis ground Grounding Output referenced to chassis ground Heater connector Dual banana Heater connector Detachable terminal block Front Panel Display 2 line x 20 character liquid crystal display with 5 5 mm character height Number of reading displays 1 to 4 Display units K C V mV Q Reading source Temperature sensor units Display update rate 2 rdg 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 re
14. solution 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 Autotune Keypad 20 key membrane numeric and specific functions Front panel features Front panel curve entry keypad lock out Interface IEEE 488 interface Features Reading rate Software support Serial interface Electrical format Baud rates Connector Reading rate SH1 AHI T5 L4 SR1 RL1 PPO DC1 DTO CO El To 10 rdg s on each input LabVIEW driver consult factory for availability RS 232C 9600 19200 38400 57600 9 pin D style DTE configuration To 10 rdg s on each input General Ambient temperature Power requirement 15 C to 35 C at rated accuracy 5 C to 40 C at reduced accuracy 100 120 220 240 VAC 6 10 50 or 60 Hz 85 VA Size 216 mm W x 89 mm H x 368 mm D 8 5 in x 3 5 in x 14 5 in half rack Weight 4 00 kg 8 82 Ib Approval CE mark Ordering Information Part number 329 325 11 329 12 Description Two diode RTD inputs One diode RTD one thermocouple input Two thermocouple inputs Specify line power option VAC 100 VAC 120 VAC 120 ALL VAC 220 VAC 240 Instrument configured for 100 VAC with U S power cord Instrument configured for 120 VAC with U S power cord Instrument configured for 120 VAC with U S power cord and universal Euro line cord and fuses for 220 240 VAC setting Instrument
15. y isolated from other instrument functions for quiet and repeatable sensor measurements The Model 325 also uses current reversal to eliminate thermal EMF errors in resistance sensors Sensor data from each input is updated up to ten times per second with display outputs twice each second Temperature Controller water Ea Lara F a a GA 4 5 amp E D oo i 2 3 vi Tae nd dada Prada da Standard temperature response curves for silicon diodes platinum RTDs ruthenium oxide RTDs and many thermocouples are included Up to fifteen 200 point CalCurves for Lake Shore calibrated temperature sensors or user curves can be stored into non volatile memory A built in SoftCal algorithm can be used to generate curves for silicon diodes and platinum RTDs for storage as user curves The Lake Shore curve handler software program allows sensor curves to be easily loaded and manipulated Sensor inputs for the Model 325 are factory configured and compatible with either diodes RTDs or thermocouple sensors Your 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 the sensor type is entered via the instrument front panel The Lake Shore SoftCal algorithm for silicon diode and platinum RTD sensors is a good solution for
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