Cryogenic Temperature Controllers

Product Summary

Designed for general purpose laboratory and industrial temperature control, The Model 42/44 supports virtually any cryogenic temperature sensor. Each input has extended-range operation to below 100mK.

The Model 42 has two sensor inputs and the Model 44 has four. Both controllers feature dual linear-output control loops.

Features of the Model 42 and 44 include:

• Supports more cryogenic sensors than any other product in the industry. Two or four multi-purpose inputs support Silicon Diode, Platinum RTD, Rhodium-Iron and all Negative-temperature-Coefficient resistor sensors. Sensors from most manufacturers, including Cryo-con, are directly supported.
• Widest temperature range: Operation from <100mK to over 1020K with appropriate sensor.
• Advanced Constant-Voltage AC sensor excitation for Negative-Temperature-Coefficient (NTC) resistive sensors. Minimizes self heating at low temperature while increasing excitation current for high temperature.
• Directly supports Helium 3 refrigerator control. 
• Proprietary cryocooler thermal signature subtraction. Best control stability in the industry.
• Extremely low noise design. Operates effectively in the most demanding cryogenic environments. RFI tight all Aluminum chassis.
• Dual autotuning control loops. Linear heater outputs of 50 and 10 Watts into a 50 Ohm load. For ultra-low temperature operation, the primary heater has a 50mW full-scale output range and the secondary loop has a 1.0W range.
• CalGen™ feature allows the user to custom fit any Diode, NTC resistor or Platinum sensor calibration curve.
• Standard remote interfaces are Ethernet, IEEE-488 and RS-232.

The Model 32 and Model 32B are two-input, dual loop controllers that support a wide range of sensor
types and provide high accuracy control from 200mK to 1,020K.

Features of the Model 32 and 32B include:

• Two multipurpose input channels support Diode, Platinum RTD and most cryogenic NTC resistive temperature sensors. A thermocouple input is optional.
• Wide temperature range: 200mK to 1500K with appropriate sensor.
• Constant-Voltage AC sensor excitation for Negative-Temperature-Coefficient (NTC) resistive sensors reduces sensor self-heating. 
• Proprietary cryocooler thermal signature subtraction. Best control stability in the industry.
• Dual autotuning control loops. The Model 32B has independent, linear heater outputs of 50 and 10-Watts into a 50-Ohm load. The Model 32 has a 50-Watt output and a second loop output of 0 to 10 Volts.
• CalGen™ feature allows the user to custom fit any Diode, NTC resistor or Platinum sensor calibration curve.
• Standard remote interfaces are IEEE-488 and RS-232.

Model 24 Cryogenic Temperature Controller

Features of the Model 24 include:

• Four multipurpose input channels support Diode, Platinum RTD and most cryogenic NTC resistive temperature sensors. Two thermocouple inputs are optional.
• Advanced Constant-Voltage AC sensor excitation: Operation from 500mK to over 1500K with appropriate sensor. Constant-Voltage, AC excitation of resistive sensors minimizes errors and extends their useful temperature range.
• Proprietary cryocooler thermal signature subtraction.
• Dual loop control. Loop #1: 50-Watt, threerange. Loop #2: 10-Watt.
• Fail-safe cryostat protection features protect user equipment from damage.
• CalGen™ feature allows the user to custom fit any Diode, NTC resistor or Platinum sensor calibration curve.
• Remote interfaces include Ethernet, RS-232 and IEEE-488.2 (GPIB). Industry standard SCPI command language. National Instruments, Inc. LabVIEW™ drivers are available.

Model 62 Cryogenic Temperature Controller

The Model 62 is a Cryogenic Temperature Controller based on a Picowatt AC Resistance Bridge.

Two multipurpose input channels are available that can be independently configured for AC measurement with Cryogenic Resistor sensors as well as DC measurement of Silicon Diodes, Thermistors and Platinum RTDs.

Dual control loop operation is supported using a 50W, four range linear heater and a second 400mW output.

Features of the Model 62 include:

• Widest temperature range: 50mK to 800K depending on sensor type
• Two multi-purpose inputs support Diode and RTD sensors
• Constant-Voltage sinusoidal sensor excitation from 10uV to 10mV for minimum sensor self-heating.
• Dual-loop outputs include a 50W, four range heater and a second 400mW output.
• Extremely low noise design for operation in the most demanding of cryogenic environments.
• Enhanced performance through the extensive use of Digital Signal Processing
• CalGen™ feature allows the user to custom fit any Diode, NTC resistor or Platinum sensor calibration curve.
• Standard interfaces include USB, IEEE-488 and RS-232