Teledyne 100AH instruction manual Unstable Span, Unstable Zero, 10-26

Teledyne API Model 100AH SO2 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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