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Model 24C Cryogenic Temperature Controller

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  • Front Panel
  • Rear Panel


Highlights of the Model 24C:

  • Four multipurpose input channels support Diode, Platinum RTD and most cryogenic NTC resistive temperature sensors. Thermocouple inputs are optional.

  • Operation from 100mK to over 1,500K with an appropriate sensor. Constant-Voltage, AC excitation of resistive sensors minimizes errors and extends their useful temperature range.

  • Four control loops: Loop #1: 50-Watt, three range. Loop #2: 25-Watt two range, Loops #3 and #4: non-powered.

  • Large, bright and highly configurable display.

  • Two dry-contact 10A relay outputs.

  • Data logging to internal Non-Volatile memory.

  • Fail-safe cryostat protection features protect user equipment from damage.
  • Table mode control automatically switches the loop input sensor to allow smooth, continuous control over a wide range of temperature.

  • Remote interfaces include Ethernet and RS-232. IEEE-488.2 (GPIB) is optional.

  • Protect your system software: Remote command language is IEEE-488.2 SCPI compliant.

  • National Instruments, Inc. LabVIEW™ drivers are available for all interfaces.




  • Input Connectors: DIN-6 receptacles provide 4-wire measurement connection plus shield and +5VDC power for external thermocouple options.
  • Loop #1: 50-Watt heater output. Dual Banana Plug with chassis ground lug.
  • Loop #2: 25-Watt heater, part of a 10 pin detachable terminal block.
  • Loop #3 and #4: 10/5-Volt non-powered output. Detachable terminal block.
  • Relay Outputs (2): Detachable terminal block.
  • Ethernet: RJ-45 with LAN activity indicator LEDs.
  • IEEE-488 (GPIB): Option connects to Ethernet port.
  • RS-232: Null-modem connector (DB-9, pins).
  • AC Power: RFI filtered Power Entry Module including fuse drawer and line voltage selector.



General Description

The Model 24C is a four-input, four control loop cryogenic temperature controller designed for general purpose laboratory and industrial use. Each input is independent and capable of temperature measurement to <200mK with an appropriate temperature sensor.

The Four-output control loop circuits feature a primary 50W heater, a secondary heater of 25W and two 10/5-Volt non-powered outputs. All control modes are supported by all outputs.

Easy to use: The 24C front panel incorporates a high resolution graphics TFT type Liquid Crystal Display with an exceptionally wide viewing angle. With it's bright white LED backlight, complete instrument status can be seen at a glance, even from across the room.

Flexible Inputs: The Model 24C has four independent input channels, each of which can be easily configured to operate virtually any type of cryogenic thermometers including an option for up to four thermocouple sensors.

A unique feature of the Model 24C is the use of a ratiometric AC resistance bridge to measure all types of temperature sensors

The resistance bridge is used in a constant-voltage AC mode to provide robust support for the Negative Temperature Coefficient (NTC) sensors. These include
, Carbon-Glass, Cernox™, Carbon-Ceramic, Germanium and several others.

Positive Temperature Coefficient (PTC) resistor sensors including Platinum and Rhodium-Iron RTDs use the resistance bridge in its constant-current, AC mode.

Diode sensors are supported over their full temperature range by using the Model 24C's bridge in a DC, constant-current mode.

Four Control Loops: The Loop #1 heater output is a linear, low noise RFI filtered current source that can provide up to 50-Watts into a resistive loads. Three full-scale ranges are available in decade increments down to 500mW.

Loop #2 is a linear heater with that will provide up to 25-Watts with two decade ranges.

Loop #3 and #4 are non-powered voltage outputs intended to control an external booster power supply. Output is user selectable at zero to 10-Volts or zero to 5.0-Volts.

All control loops are completely independent and any loop may be controlled by any sensor input.

Alarms and Relays: Visual, remote and audible alarms. Additionally, there are two large dry-contact mechanical relays. Each may be independently programmed to assert or clear based on a high or low temperature condition.

Remote Control: Standard remote interfaces include 100/10 Ethernet and RS-232. IEEE-488(GPIB) is optional.

Data logging is performed by continuously recording
to an internal 1,000 entry buffer. Data is time stamped
and non-volatile memory is used so that data will
survive a power failure.

LabView™ drivers are supplied for all interfaces.

Firmware updates: Full instrument firmware
updates may be installed by using the Ethernet
connection. All updates are free of charge.



Helium 3 refrigerators:

Cryogen-Free systems:

General purpose laboratory:

Superconducting Magnets:

Data Acquisition / Computer control:


For applications requiring high output power, consider the Model 26

folder Model 26 Product Folder>>

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Specifications subject to change without notice. ©Cryogenic Control Systems, Inc. 1998 - 2022