COSA Xentaur Xentaur HDT - Manual (Page 17)

HDT User’s Manual
page 10
Troubleshooting unexpected readings (table spans 2 pages)
For non-sensor related problems (e.g. no reading on instru-
ment) refer to section 3.5
Symptom Possible Cause
Reading is not
changing
Condensation in sample system.
Slow Response
1. Water vapor in the system.
2. Flow rate too low.
3. Sample pipe too large and/or too long.
4. Unsuitable sample pipe material.
5. Leaks
6. Hygroscopic materials in sample system
Dry Reading faulty sensor.
Wet Reading
Leak in system or use of unsuitable pipe.
Comparison of readings with manual cooled-
mirror instrument.
current loop
outside of 4/20mA
range
1. Prolonged exposure to wet gas.
2. Instrument Failure.
3. .Short circuited sensor.
4. Open circuit on sensor.
5. Instrument failure .