Emerson Rosemount 644 Reference Manual page 102

Troubleshooting
March 2021
Sensor open
Sensor 1 is used here as an example. If Dual Sensors are ordered this alert can apply to
either sensor.
ALARM SNSR 1 ALARM FAIL
Potential cause
The transmitter has detected an open sensor condition. The sensor may be disconnected,
connected improperly, or malfunctioning.
Recommended actions
Sensor short
Sensor 1 is used here as an example. If Dual Sensors are ordered this alert can apply to
either sensor.
ALARM SNSR 1 ALARM FAIL
Potential cause
The transmitter has detected a shorted sensor condition. The sensor may be
disconnected, connected improperly, or malfunctioning.
Recommended actions
Terminal temperature failure
ALARM TERM ALARM FAIL
Potential cause
The terminal temperature is outside the internal RTD's specified operating range.
Recommended actions
Verify the ambient temperature is within the device specified operating range using
the terminal temperature information button.
102
1. Verify the sensor connection and wiring. Refer to the wiring diagrams found on
the transmitter label to ensure proper wiring.
2. Verify the integrity of the sensor and sensor lead wires. If the sensor is faulty,
repair or replace the sensor.
1. Verify the process temperature is within the specified sensor's range. Use the
Sensor Information button to compare with the process temperature.
2. Verify the sensor is properly wired and connected to the terminals.
3. Verify the integrity of the sensor and sensor lead wires. If the sensor is faulty,
repair or replace the sensor.
Reference Manual
00809-0200-4728
Emerson.com/Rosemount