Instruction Manual
Tek-Bar 3120B
www.tek-trol.com
30
Technology Solutions
7.1
Symptoms and Corrective Measures
Refer to the table below to verify whether the transmitter hardware and process
connections are in good working condition:
Symptom
Potential Source
Corrective Action
No communication
between the
Transmitter and HART
communicator
Loop Wiring
Check for a minimum of 250
Ω
resistance between the power supply
and HHT.
Check for an adequate voltage to the
transmitter. The transmitter always
requires 11.9 to 45VDC.
Check for intermittent shorts, open
circuits, and multiple grounds.
w
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.
In case 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 the sensor failure.
Check the PV to see if it is out of
range.
