Model 325 Temperature Controller
Contents
1. 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 to indicate which channel is being controlled by the displayed control loop a ll RS 232 OTE o EARLE NOUSER Liesa PARTS INSIDE REFER A I 1250001 SERVICING TO TRAINED SERVICE PERSONNEL LOOP 2 HEATER OUT HI LO Model 325 Rear Panel Connections O Loop 1 heater output O Serial RS 2320 I O DTE Line input assembly e e 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 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 Y TOUI 12. reset 1 to 1000 1000 s with 0 1 setting resolution Derivative rate 1 to 200 with 1 resolution Manual output Zone control Setpoint ramping Safety limits 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 mail info lakeshore com Loop 1 Heater Output Loop 2 Heater Output 25 Q Setting 50 Setting 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 2W Max current 1A 0 71 A Max voltage oV 10V Voltage compliance 25 V 35 4 V Current compliance 0 2 A Heater load range 20 Oto 25 Q 40 Q to 50 Q Heater load range gt 20 0 gt 500 Heater load for max power 290 900 Heater load for max power 290 500 Ranges 2 2 5 W 25 W Ranges 1 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 dale ae liquid crystal display with 5 5 mm Ord erin g nform ation Number of reading displays 1 to 4 DO Display units K C V mV Q Part number Description Readi
3. 3 2 Kto 1505K Not recommended Type E 9006 004 3 2Kto 934K Not recommended Chromel AuFe 9006 002 1 2K to 610 K 0 07 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 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 Tempe
4. 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 Q 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 5 3 mK 60 mK 106 mK 10 6 mK Cernox CX 1050 SD HT 4 2K 39072 0 1120 8 Q K 36 uK 1 4 mK 6 4 mK 2 UK with 4M 77K 205 67 O 2 4116 Q K 16 6 mK 76 mK 92 mK 39 2 MK calibration 300 K 59 467 Q 0 1727 Q K 232 mK 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 94 Q 27 Q K 1 9 mK 5 19 mK 10 2 mK 3 8 mK 100 K 2 120 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 51 mK 116 uK calibration 10K 253 Q 62 Q K 807 uK 3 2 mK 8 2 mK 1 6 mK 100 K 2 80 Q 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 21 650 0 157 Q K 255 mK 692 mK 717 mK 510 mK calibration 300 K 11 99 Q 0 015 Q K 2 667 K 7 K 7 1K 5 334 K Thermocouple Type K TDI 5862 9 uV 15 6 uV K 26 mK 0 25 K Calibration not 52 mK 50 mV 300 K 1075 3 uV 40 6 uV K 10 mK SO KY available from 20 mK 600 K 13325 uV 41 7 uV K 10 mK 0 184 K Lake Sho
5. 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 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
6. 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 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 2 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 2 setting or 1 W at the 25 2 setting When not being used for temperature control the loop 2 heater output can be used as a manually controlled
7. voltage source The output voltage can vary from 0 to 10V on the 50 Q setting or 0 to 5 V on the 25 2 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 Temperature limit settings for inputs are provided as a safeguard against system damage Each input is assigned a temperature limit and if any input exceeds that limit all control channels are automatically disabled Firmware version 1 5 and later 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
8. Model 325 Temperature Controller O x o O A di gt gt 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 10V maximum E EEE 488 and RS 232C interfaces Model 325 Temperature Controller 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 Q 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 o
9. ThATION AXIO Loop 2 heater output O Sensor input connectors O EEE 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 T260K amp B lt 3T Silicon Diode DT 670E BR 30Kto500K T gt 60K amp B lt 3T Silicon Diode DT 414 14Kt0375K T gt 60K amp B lt 3T Silicon Diode DT 421 14Kt0325K T gt 60K amp B lt 3T Silicon Diode DT 470 SD 14Kto500K T 60K amp B lt 3T Silicon Diode DT 471 SD 10 K to 500 K GaAlAs Diode TG 120 P 1 4 K to 325 K GaAlAs Diode TG 120 PL 1 4 K to 325 K GaAlAs Diode TG 120 SD 1 4 K to 500 K Positive Temperature 100 Platinum PT 102 3 Coefficient RTDs 100 Platinum PT 111 Rhodium Iron RF 800 4 oss Rhodium Ion RF 100T U Negative Cernox CX 1010 Temperature Cernox CX 1030 HT 3 5 K to 420 K6 Coefficient RTDs Cernox CX 1050 HT 4Kto420K T gt 2K amp B lt 19T Cernox CX 1070 HT 15Kto 420K T gt 2K amp B lt 19T Cernox CX 1080 HT 50Kto420K Germanium GR 300 AA 1 2K to 100 K Not recommended Germanium GR 1400 AA 4 K to 100 K Not recommended Carbon Glass CGR 1 500 4 K to 325 K Carbon Glass CGR 1 1000 5Kto325K T gt 2K amp B lt 19T Carbon Glass CGR 1 2000 6Kto325K T gt 2K amp B lt 19T Rox RX 102A 1 4 K to 40 KS Thermocouples Type K 9006 006
10. ial interface G 106 233 Sensor input mating connector 6 pin DIN plug 2 included Electrical format RS 2320 106 735 Terminal block 2 pin Baud rates 9600 19200 38400 57600 I Calibration certificate Connector 9 pin D style DTE configuration MAN 325 Model 325 user manual Reading rate To 10 rdg s on each input l Accessories available 6201 1 m 3 3 ft long IEEE 488 GPIB computer interface General cable assembly Ambient temperature 15 C to 35 C at rated accuracy 5 C to 40 C at reduced accuracy 8001 325 CalCurve factory installed the breakpoint Power requirement 100 120 220 240 VAC 6 10 50 or 60 Hz 85 VA table from a calibrated sensor stored in the instrument Size 216 mm W x 89 mm H x 368 mm D extra charge for additional sensor curves 8 5 in x 3 5 in x 14 5 in half rack CAL 325 CERT Instrument recalibration with certificate Weight 4 00 kg 8 82 Ib CAL 325 DATA Instrument recalibration with certificate and data Approval CE mark RM Y Kit for mounting one 1 2 rack temperature controller in a 482 6 mm 19 in rack 90 mm 3 5 in high RM 2 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 o M www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com akeShore Lake Shore Cryotronics Inc 575 McCorkle Boulevard Westerville OH 43082 8888
11. ng source Temperature sensor units l Display update rate 2 rdg s 325 Two diode RTD inputs l Temp display resolution 0 001 from 0 to 99 999 0 01 from 100 to 999 99 325 T1 One diode RTD one thermocouple input 0 1 above 1000 325 T2 Two thermocouple inputs Sensor units display resolution Sensor dependent to 5 digits Other displays Setpoint Heater Range and Heater Output user selected Specify line power option Setpoint setting resolution Same as display resolution actual resolution is sensor dependent VAC 100 Instrument configured for 100 VAC with U S power cord Heater output display Numeric display in percent of full scale for power or current VAC 120 Instrument configured for 120 VAC with U S power cord Heater output resolution 1 VAC 120 ALL Instrument configured for 120 VAC with U S power cord Display annunciators Control Input Remote Autotune and universal Euro line cord and fuses for 220 240 VAC setting Keypad 20 key membrane numeric and specific functions VAC 220 lel ee alle for 220 VAC with universal EU AS A O Sn VAC 240 Instrument configured for 240 VAC with universal Interface Euro line cord IEEE 488 interface Other country line cords available consult Lake Shore Features SH1 AH1 T5 L4 SR1 RL1 PPO DC1 DTO CO El a Reading rate To10rdg s on each input Accessories included Software support LabVIEW driver consult factory for availability 106 009 Heater output connector dual banana jack Ser
12. ptically 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 www lakeshore com Lake Shore Cryotronics Inc Se Ma j ala AN mesier SP anne i mese on 4 5 6 P o p Loop i k 1 2 3 Sel Control Manual 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
13. rature Equivalents Nominal Resistance Voltage Example Temp Lake Shore Sensor Typical Sensor Sensitivity Temperature Accuracy including Electronic Accuracy CalCurve and Calibrated Sensor 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 www lakeshore com Lake Shore Cryotronics Inc OM 614 891 2244 fax 614 818 1600 e mail info lakeshore com 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 TFR 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 TEK 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
14. re 20 mK 1505 K 49998 3 uV 36 006 uV K 12 mK ZO ORKE 24 mK Model 325 Specifications Input Specifications Sensor Input Temperature Range Coefficient Excitation Current Display Resolution Electronic Control Stability Electronic Accuracy Measurement Resolution Diode negative 0Vto2 5V 10 uA 0 05 13 100 uV 10 uV 80 uV 0 005 of rdg 20 uV negative 0 Vto 7 5 V 10 A 0 05 1 100 uV 20 uV 80 uV 0 01 of rdg 40 uV PTC RTD positive 02105002 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 ma NTC RTD negative 09to75009 10uA 0 05 100 mQ 40 MQ 0 1 Q 0 04 of rdg 80 mQ Thermocouple positive 25 mV NA 1uV 0 4 uV 1 uV 0 05 of rdg 0 8 uV positive 50 mV NA 1 pV 0 4 uV 1 uV 0 05 of rdg 0 8 uV 11 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 or thermocouple Isolation but not each other A D resolution 24 bit Input accuracy Each input is factory configured for either diode RTD Sensor inputs optically isolated from other circuits Sensor dependent refer to Input Specifications table Measurement resolution Sensor dependent
15. 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 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 Diode RTD Room for 15 200 point CalCurves or user curves 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 Standard curves Type E Type K Type T AuFe 0 07 vs Cr AuFe 0 03 vs Cr Input connector 6 pin DIN Ceramic isothermal block Control Control loops Control type Tuning Control stability 14 Current source error is removed during calibration 13 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 Proportional gain 0 to 1000 with 0 1 setting resolution Integral
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