Lower temperature limits of 224

The temperature range of operation for the sensors shown in the Model 224 specifications is based on what is considered worst case conditions.

For the NTCRTD Cernox Sensor, the model 224 can read resistance values between zero and 100 kΩ. Based on typical calibration data, the CX-1010 sensor will reach 100 kΩ at approximately 0.3K. If you are able to source a Cernox sensor that has a resistance less than 100 kΩ at temperatures below 0.3K then it will work with the Model 224.

If you have a sensor that has a resistance below 100 kΩ at 100K, you can load that curve into the Model 224 and use the sensor. If you do not have a sensor that meets the 100 kΩ requirement, you can contact Quantum Design UK and Ireland and ask them to see if a custom sensor can be ordered that would meet your needs.