Cryo-con Model 24C Specifications, Features and Functions
Input Channel Characteristics
There are four independent, multi-purpose input channels; each of which can
separately be configured for use with any supported sensor.
Input Configurations
A complete list of the sensor types supported by the Model 24C is shown below:
Sensor Type
Max. Voltage/
Resistance
Bias
Type
Excitation
Current
Typical Use
Diode 2.25V CI 10µA DC Silicon diode, GaAs diode.
ACR
10 to 1.0M
CV
2.5mA - 10nA
AC
NTC resistors including Ruthenium
Oxide, Cernox™
PTC100
0.5 - 500
CI 1.0mA AC
100 Platinum, Rhodium-Iron
PTC1K
5 - 5.0K
CI 100uA AC
1,000 Platinum
CLTS
300
CI 100uA AC CLTS
TC70 ±70mV None 0
All thermocouple types. (requires
Thermocouple option)
None 0 None 0 Disable Input Channel
Table 10: Supported Sensor Configurations
Bias types are:
CI – Bridge maintains a constant current through the sensor.
CV – Bridge maintains a constant voltage-drop across the sensor.
i Note: Any disconnected inputs to the Model 24C should be set
to type 'None'. This will turn the input off.
Silicon Diode Sensors
Silicon diode sensors (2-volt diodes) are configured with a 10mA current source
excitation and a 2.25 Volt input voltage range.
Gallium-Arsenide Diode Sensors
Gallium-Arsenide diodes or 6-Volt diodes are sometimes used in systems where
magnetic fields are present. Use is limited to operation above about 30K with fields of
less than 5T. The Model 24C supports these sensors down to 25K. If your
requirements are for lower temperature operation, Ruthenium-Oxide is a better
choice.
Gallium-Arsenide sensors do not fit standard calibration curves, therefore, the user
must provide a sensor-specific curve before using this type of sensor.
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