sensor input fault. With 4-20 mA output sensors, the current output is below 2 mA or above 35mA. In normal operating mode, the unit automatically goes through warmup when this fault clears. If this fault occors at the end of the warmup period or calibration procedure, recalibrate the sensor. If fault persists, check sensor condition and wiring. ( Cal message) sensor reaching end of life. consider replacement of the sensor in the next 1 or 2 calibrations.
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