ATT2100 TEMPERATURE TRANSMITTER
Operation Manual M2100-REV-G
46
6.3 Hardware Diagnostics
If you suspect a malfunction despite the absence of any diagnostic messages on the HHT follow Table 6-
1 described here to verify that transmitter hardware and process connections are in good working order.
If you suspect a malfunction despite the absence of any diagnostic messages on the HHT follow Table 6-
1 described here to verify that transmitter hardware and process connections are in good working order.
Symptom
Potential Source
Corrective Action
Transmitter
Does not
Communicate
With HART
Communicator
Loop Wiring
Check for a minimum of 250 ohms resistance
between the power supply and HHT.
Check for adequate voltage to the transmitter.
The transmitter always requires 11.9 ~ 45 Vdc.
Check for intermittent shorts, open circuits, and
multiple grounds.
High Output
Sensor Input Failure
Connect HHT and enter the Transmitter test mode
to isolate a sensor failure.
Loop Wiring
Check for dirty or defective terminals,
interconnecting pins, or receptacles.
Power Supply
Check the output voltage of the power supply at
the transmitter terminals. It should be 11.9 to 45
Vdc in spite of loop scale.
Electronics Module
Connect HHT and enter the Transmitter test mode
to isolate module failure. Check the sensor limits
to ensure calibration adjustments are within the
sensor range.
Erratic Output
Loop Wiring
Check the output voltage of the power supply at
the transmitter terminals. It should be 11.9 to 45
Vdc.
Check for intermittent shorts, open circuits, and
multiple grounds.
Check for proper polarity at the signal terminals.
Incase measuring electric current while digital
communication, output appear -0.013mA
Electronics Module
Connect HHT and enter the Transmitter test mode
to isolate an electronics mode failure.
Low Output or
No Output
Sensor Element
Connect HHT and enter the Transmitter test mode
to isolate a sensor failure.
Check the PV to see if it is out of range.
Loop Wiring
Check for adequate voltage to the transmitter.
The transmitter always requires 11.9 ~ 45 Vdc.
Check for intermittent shorts, open circuits, and
multiple grounds.
Check polarity of singal terminal
Check the loop impedence.
Electronics Module
Connect HHT and check the sensor limits to
ensure calibration adjustments are within the
sensor range.