Cryo-con Model 24C Specifications, Features and Functions
Sensor Selection: Front Panel or remote interface. There are no internal
jumpers or switches.
Sample Rate: 15Hz per channel in all measurement modes.
Digital Resolution: 24 bits.
Measurement Filter: 0.5, 1, 2, 4, 8, 16, 32 and 64 Seconds.
Calibration Curves: Built-in curves for industry standard sensors plus eight
user curves with up to 200 entries each. Interpolation is performed using a
Cubic Spline.
CalGen: Calibration curve generator fits any diode or resistor sensor curve at
1, 2 or 3 user specified temperature points.
Sensor Performance Specifications:
Diode Sensors
Configuration: Constant-Current mode, 10mA ± 0.05% DC excitation.
Note: Current source error has negligible effect on measurement accuracy.
Input voltage range: 0 to 2.00VDC.
Accuracy: ±(80mV + 0.005% * reading)
Resolution: 2.3mV
Drift: 25ppm/ºC over an ambient temperature range of 25ºC± 5ºC.
PTC Resistor Sensors
Configuration: Constant-Current AC resistance bridge mode.
Ratiometric measurement cancels any error in excitation current.
Drift: 20ppm/ºC over an ambient temperature range of 25ºC± 5ºC.
AC Excitation Frequency: 7.5Hz bipolar square wave.
Range
Max/Min
Resistance
Excitation
Current
Resolution Accuracy
PTC100
1mA
500W
0.01W
1.0mA
0.1mW
± (0.004 + 0.01%)Ω
PTC1K
100mA
7.5KW
0.1W
100mA 1.0mW
± (0.05 + 0.02%)Ω
Table 6: Accuracy and Resolution for PTC Resistors
Note: The Model 24C is calibrated with AC excitation. User
selection of DC excitation will introduce offset errors in temperature
measurement.
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