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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
10.2.6 Unstable Span
Common causes are:
1. Leak in pneumatic system.
2. Unstable UV lamp output - replace lamp.
3. Sample lines or sample filter dirty - clean or replace.
4. Plugged sample inlet orifice - clean with methanol and sonic cleaner.
5. Defective HVPS - use optic test and electric test to isolate the HVPS. See also Section 10.3.9
HVPS test procedure.
6. Bad or defective PMT detector - check Optic test.
7. Reaction cell temperature not stable - observe warning messages, or RCELL TEMP in TEST
functions. Check diagnostic LED in Power Supply Module for normal cycling.
8. PMT temperature not stable - observe warning messages, or PMT TEMP in TEST functions.
9. Sample vent line too short, allowing room air to mix with span gas - line should be a
minimum of 15" long.
10. Calibration gas source unstable.
10.2.7 Unstable Zero
Common causes are:
1. Leak in pneumatic system.
2. Light leak - check the sensor module with strong light.
3. Sample lines or sample filter dirty - clean or replace.
4. Zero gas source unstable - verify quality of zero air and the flow rate.
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