Emerson Rosemount 248 Reference Manual page 56

Section 4: Operation and Maintenance
March 2014
Potential
Symptom source
Low Output or Sensor
No Output Element
Loop Wiring
Electronics
Module
48
Corrective action
Connect a Field Communicator and enter the Transmitter test mode to

isolate a sensor failure.
Check the process variable to see if it is out of range.

Check for adequate voltage to the transmitter. It should be 12.0 to

42.4 V dc (over entire 3.75 to 23 mA operating range).
Check for shorts and multiple grounds.

Check for proper polarity at the signal terminal.

Check the loop impedance.

Connect a Field Communicator and enter the Loop test mode.

Check wire insulation to detect possible shorts to ground.

Connect a Field Communicator and check the sensor limits to ensure

calibration adjustments are within the sensor range.
Connect a Field Communicator and enter the Transmitter test mode to

isolate an electronics module failure.
Reference Manual
00809-0100-4825, Rev CB
Operation and Maintenance