SHB_U14 Chapter 4: Troubleshooting 4-7
Negative measurement signal
Indication
Values occasionally or permanently below "0" in small measurement ranges.
Status messages
No status messages
Details
Possible cause Measures
Improper sample gas preparation - Check the cooler
- Check dew points of sample gas and,
if applicable, zero gas
Sample components in zero gas Replace zero gas
Inadequate purge time prior to zero
calibration
Increase purge time
Defective IR detector Replace IR detector
Cross-sensitivity influence - Check IR detector
- Check and, if necessary, replace filter
cell
- Check and, if necessary, replace
optical filter
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