What does it mean if the recorder Display permanently shows a sensor reading of -40 or -39?. For any sensor position number.
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There are a number of reasons for this:
1. The sensor cable or the sensor connections at the Recorder terminals may be open circuit . This will cause the recorder to determine that the temperature is below the maximum range of the instrument and display the minimum reading capable ie -40C. Check the sensor or connections for an open circuit.
2. To check the recorder, short out the sensor in question and the reading should now show +49. If this is shown the recoder is operating correctly and the sensor probe or cable is open circuit.
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