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Model 44 / 42 Cryogenic Temperature Controller

Product Folder

Front Panel
Rear Panel

M44front

Major highlights of the Model 44 / 42:
Maximum flexibility: Four multipurpose input channels support Diode, Platinum RTD and virtually all cryogenic NTC resistive temperature sensors. Operation from below 50mK to over 1020K with an appropriate sensor. Step-less Constant-Voltage AC sensor excitation extends the useful temperature range of resistive temperature sensors. Precision dual control loops. Loop #1: 50-Watt, four-range. Loop #2: 10-Watt, two-range.		Fail-safe cryostat protection features protect user equipment from damage. Programmable logic interface provides a complete 'One Box' solution for refrigerator control including He3 systems. Unique synchronous filter improves control accuracy and stability in cryocooler based systems. 10/100 Ethernet interface in addition to RS-232 and IEEE-488.2 (GPIB). LabView™ drivers available for all interfaces including Ethernet.

M44rear

Input Connectors: DIN-6 receptacles provide 4-wire measurement connections.
Loop #1: Heater output, DIN-3 receptacle.
Loop #2: Heater output, DIO 1-4: DIN-8 receptacle.
10/100 Ethernet: RJ-45 with LAN activity indicator LEDs.
IEEE-488: Standard IEEE-488.2 (GPIB) connector.
RS-232: Null-modem connector (DB-9, pins).
Power Entry Module: RFI filter, fuse drawer and line voltage selector.

General Description

The Model 42/44 cryogenic temperature controllers are the first instruments in their class to extend operation to ultra-low temperature providing robust support for He3 refrigerators at a very cost-effective price.

The Model 42 has two multi-purpose inputs and the Model 44 has four. Each input is capable of measurement to ultra-low temperature by using a sophisticated 100μV ratiometric resistance bridge. For general-purpose thermometry applications, each input supports a wide variety of standard sensors.

The dual-output control loop circuits features power levels as high as 50W and as low as 50mW full-scale in order to support ultra-low temperature operation. The Model 44/42 heater outputs have been field proven for use with ultra-low temperature refrigerators. They feature low noise, high resolution and extremely low leakage current.

Cryo-con’s Model 42/44 are the first temperature controllers to incorporate Ethernet LAN connectivity which adds a new dimension of flexibility to industrial and laboratory applications. Ethernet is an effective upgrade and replacement for IEEE-488 (GPIB) based systems.

Applications

Ultra-Low temperature:

100µV Constant-Voltage excitation offers robust support for Ruthenium-Oxide or Cernox™ sensors to <50mK.
Four input channels. Most He3 refrigerators require at least three.
Programmable logic interface for He3 refrigerator control.
High precision control loop with PID control that is enhanced for operation below 1.0K.

General purpose laboratory:

Up to 4 inputs. Each supports virtually every cryogenic temperature sensor offered by every manufacturer.
Constant-Voltage excitation offers the widest possible temperature range for a given sensor.
Dual control loops. Digital Signal Processing techniques extend control loop resolution to provide the best control stability and widest range in the industry.
Ethernet connectivity for ease of remote control. Significant upgrade over IEEE-488 or RS-232 based systems. Native LabView™ support.
Robust cryostat protection controls.
Complete instrument configurations may be saved and instantly restored.
Command scripts simplify system setup and test.

Superconducting Magnets:

Constant-voltage sensor excitation extends the high and low temperature range of sensors normally used in high magnetic fields.
Cryogen-Free magnet systems often require more than two inputs.

Cryogen-Free systems:

Proprietary cryocooler thermal signature removal offers the best control stability in the industry for cryocooler based systems.
Four input channels. Cryogen-Free systems often require more than two.
Especially effective in ultra-low temperature cryogen-free systems.

Data Acquisition / Computer control:

Ethernet interface in addition to IEEE-488 and RS-232. Ethernet allows the simple and inexpensive connection of many instruments to a Local Area Network. It is directly supported by all data acquisition software packages including LabView™.
Robust implementation of the IEEE-488.2 SCPI command language facilitates system software development.
Remote command language is identical across the entire product line, therefore ensuring your system software will not become obsolete.

CalGen™ and Cryo-Con™ are registered trademarks of Cryogenic Control Systems, Inc.
All other product and company names are trademarks or trade names of their respective companies.

Tel: (858) 756 3900 Fax: (858) 759 3515
Specifications subject to change without notice. ©Cryogenic Control Systems, Inc. 1998 - 2010.