Chapter 3: Service & Maintenance
Page 36 HygroPro User’s Manual
3.2 Moisture Probe Error Conditions
IMPORTANT: All moisture probes require periodic cleaning to
maintain optimum accuracy. Consult the GE service
center for the recommended probe cleaning interval for
your application.
If there is a problem with the moisture probe during operation, the
HygroPro is programmed to indicate the error condition via its
analog output signal. To indicate a probe error condition, the analog
output signal is forced to the following values:
• 22 mA to indicate a short circuit in the probe
• 3.5 mA to indicate an open circuit in the probe
If you have one of the above error conditions, follow the probe
cleaning instructions in the next section.
3.3 Cleaning the Moisture Probe
To clean your HygroPro moisture probe, carefully follow the
instructions in this section.
3.3.1 Preparing to Clean the Probe
CAUTION!
Be sure to perform the probe cleaning procedure in a
well-ventilated area. Observe all necessary safety
precautions when handling the cleaning solvents
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