Emerson Rosemount 644h Manual download pdf (Page 31)

4-3

Rosemount Inc

Low Output or

No Output

Sensor

Element

• Connect a HART-based communicator and enter the

Transmitter test mode to isolate a sensor failure.

• Check the process variable to see if it is out of range.

Loop Wiring

• 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 HART-based communicator and enter the Loop

test mode.

• Check wire insulation to detect possible shorts to ground.

Electronics

Module

• Connect a HART-based communicator and check the sensor

limits to ensure calibration adjustments are within the sensor

range.

• Connect a HART-based communicator and enter the

Transmitter test mode to isolate an electronics module

failure.

Symptom

Potential

Source

Corrective Action

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Emerson Rosemount 644h Manual Page 31