4-8 Chapter 4: Troubleshooting SHB_U14
Measurement signal not sensitive enough
Indication 1 Measured values too low even after calibration performed
2 Analyzer sensitivity has lessened
Status message
For 1: No status messages
For 2: After calibration messages 2, 4 or 8 may appear.
Details
Possible cause Measures
Defective calibration cell - Remeasure calibration cell
- Replace calibration cell
Defective IR detector Replace IR detector
Sample cell contaminated - Clean or replace the sample cell
- Check sample gas preparation, install
additional filters if needed
- Use aluminum cells, perform an initial
calibration of all IR detectors involved
- Configure the module thermostat and
perform initial calibration of all IR
detectors.
Incorrect span gas concentration data
(items 1 and 2)
Check concentration data
Sample gas line leak (item 1) Perform a seal integrity test.
Sample component washed out by or
reacts with associated components
Optimize sample gas preparation
Improperly dimensioned bypass (1 and
2)
- Check pressure and volume ratios
at sample gas inlet
- Remove bypass
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