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Model 26C High Output Power Temperature Controller

Product Folder


  • Front Panel
  • Rear Panel


Highlights of the Model 26C:

  • Operation from 100mK to over 1,500K with an appropriate sensor.

  • Four multipurpose input channels. Each input is enhanced for operation with the NTC resistance sensors commonly used at ultra-low temperature while still supporting a wide variety of general purpose devices including Diodes and Platinum RTDs. Thermocouple inputs are a field installable option
  • Four high-power independent control loops: Loop #1: 100-Watt, four-range; Loop #2: 50-Watt three-range; Loop #3 and #4: 5/10 Volt.

  • Large, bright and highly configurable display.

  • Two large 10-Ampere dry-contact relays.

  • Data logging to internal Non-Volatile memory.

  • Fail-safe cryostat protection features protect user equipment from damage.

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

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



  • Input Connectors: 6-pin snap-in circular receptacles provide 4-wire measurement connection plus shield and +5VDC power for external options.
  • Loop #1: 100-Watt heater output. Detachable terminal block.
  • Loop #2: 50-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.
  • USB 2.0: Serial port emulator
  • AC Power: RFI filtered Power Entry Module.



General Description

The Model 26C is a four-input, four control loop cryogenic temperature controller that is optimized for applications requiring high output power. Each input is independent and capable of temperature measurement to 100mK with an appropriate temperature sensor.

Four High-Power Control Loops: The Loop #1 heater output is a linear, low noise RFI filtered current source that can provide up to 100W into 25Ω or 50W into 50Ω resistive loads. Four full-scale ranges are available.

Loop #2 is a three-range linear heater with that will provide up to 50 watts into a 50Ω load.

Loop #3 and #4 are non-powered analog voltage outputs designed to control an external booster power supply.

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

Flexible Sensor Inputs: The Model 26C has four identical input channels, each of which implements a ratio-metric AC resistance bridge. This bridge uses separate, balanced circuits to simultaneously measure both the voltage drop across the temperature sensor and the current flowing through it. By measuring current with higher accuracy than it can be set, precision resistance measurements are obtained, even at low excitation levels.

Negative-Temperature-Coefficient (NTC) resistors are often used as low temperature thermometers. Examples include Ruthenium-oxide, Carbon-Glass, Cernox™, Carbon-Ceramic, Germanium and several others. The Model 26C provides robust for support these sensors by using step-less constant-voltage AC excitation.

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

Silicon diode sensors are supported over their full temperature range by using the bridge in a 10µA DC constant-current mode.

Thermocouple sensors are supported by using an optional thermocouple module. This module plugs into any of the Model 26C's input channels. Up to four modules can be connected to a single instrument.

Easy to use: The 26C 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.

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 Ethernet and USB.

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 and ULT

Probe Stations

Large cryocoolers


Oven based systems

General purpose laboratory

Superconducting Magnets


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Specifications subject to change without notice. ©Cryogenic Control Systems, Inc. 1998 - 2023