Quick troubleshooting guideTable 8-4:
Symptom Action
Wrong temperature reading.
Suspected temp. compensation problem.
Perform a temperature standardization. Verify
sensor's RTD.
Resistance vs. temp.
Check wiring.
Display segments missing. Display inoperable. Replace display board.
Analyzer locks up; won't respond. Replace PCB stack.
Press RESET.
Check batteries in IRC.
Erratic displays Check sensors in process.
Transmitter won't respond to IRC key presses. Verify and clean ribbon cable connection on
CPU board. Check batteries in IRC.
Key press gives wrong selection. Replace IRC. Check ribbon cable connection on
CPU board.
Wrong or no current output. Verify that output is not being overloaded; re-
move load; replace PCB stack.
No display or indicators. Replace PCB stack.
Excess Input
Reverse Input
Check sensor wiring.
Perform sensor zero.
Check sensor zero
Analyzer will not zero. Place sensor in air and ac-
cess zero routine.
Field troubleshooting
When it is apparent by grab sample analysis that the transmitter is giving inaccurate
readings, the following procedure should be followed.
Prerequisites
The sensor surfaces need to be totally wetted by the process and air bubbles must not be
trapped in the vicinity of electrodes. If air bubbles are found, the installation technique
should be altered to eliminate the source of this error.
Procedure
1.
A quick visual inspection of the installation may identify the problem. Check to be
sure that the transmitter is mounted securely and that its internal parts are properly
connected. Next check all input and output wiring.
If the previous step did not indicate the source of the problem, the next step is to
isolate the problem to either the transmitter or the sensor.
2. The first step in troubleshooting the sensor is to disconnect it from the transmitter,
remove the sensor from the process, and thoroughly dry the sensor electrodes.
Refer to sensor manual for additional troubleshooting checks.
Diagnostics and troubleshooting
Instruction Manual 85
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