Check the following when the moisture sensor doesn’t read the proper grain moisture content:
- Wiring cable from moisture sensor to PLC unit may not have the shield grounded properly. Shield should be grounded at the high voltage cabinet but NOT at the sensor.
- VFD noise is creating a variable signal and wires from sensor need to be pulled out of wiring harness and run separately from voltage wires.
- Build-up on moisture sensor, clean off sensor.
- Sensor does not read proper temperature and cannot be adjusted to read proper temperature. The thermistor or thermocouple is damaged and sensor needs to be replaced.