Model: 644HAK5J6M5QT
Fault Symptom:
Display: ALARMA0, Output 21.75mA
Fault Analysis:
This indicates an alarm condition.
1. Inspect the sensor for loose connections or a broken platinum resistance wire (infinite resistance between red and white wires indicates a break; for 4-wire systems, disconnect all four wires from the transmitter terminals and measure resistance with a multimeter).
2. Configuration error: e.g., transmitter configured for PT100 but actually connected to a K-type thermocouple. If the connection worked initially but failed later, it's unlikely a configuration issue-inspect the sensor component separately.
