Diagnostic Messages - Emerson Rosemount 644 Reference Manual

Reference Manual
00809-0200-4728
Recommended actions
Potential cause
Electronics
Recommended actions
Connect a Field Communicator and check the sensor limits to ensure calibration
adjustments are within the sensor range.
6.4

Diagnostic messages

Listed in the below sections are detailed tables of the possible messages that will appear
on either the LCD/LOI Display, a Field Communicator, or an AMS Device Manager system.
Use the tables below to diagnose particular status messages.
• Failed
• Maintenance
• Advisory
6.4.1 Failed status
Electronics failure
ALARM DEVICE ALARM FAIL
Potential cause
Essential electronics in the device have failed. The transmitter may have experienced an
electronics failure while attempting to store information.
Recommended actions
Emerson.com/Rosemount
1. Check for adequate voltage to the transmitter. It should be 12.0–42.4 Vdc
(over entire 3.75–23 mA operating range).
2. Check for shorts and multiple grounds.
3. Check for proper polarity at the signal terminal.
4. Check the loop impedance.
5. Connect a Field Communicator and enter the Loop test mode.
6. Check wire insulation to detect possible shorts to ground.
1. Restart the transmitter.
2. If condition persists, replace the transmitter. Contact the nearest Emerson Field
Service Center if necessary.
Troubleshooting
March 2021
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