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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
Table 10-1: Test Functions (Continued)
Test Function Factory Set-Up Comment
PMT 0 - 5000 mV This is the instantaneous output of the PMT.
The PMT voltage values will be relatively constant when:
1. Electric test - variation in the 2000 mV signal observed will
be noise of the V/F board and preamp noise. See Section
10.1.3.2.
2. Optic test - variation in the 400 mV signal will be PMT
dark current, preamp, HVPS, and electronic. See Section
10.1.3.3.
3. Sampling zero gas.
4. Sampling stable SO
2
span gas.
When sampling zero gas the PMT reading should be less than
50 mV and relatively constant.
High or noisy readings could be due to:
1. Pneumatic leak.
2. Excessive background light which is caused by a possible
aging UV filter.
3. Low UV lamp output.
4. PMT recently exposed to room light. It takes 24-48 hours
for the PMT to adapt to dim light.
5. Light leak in reaction cell.
6. Reaction cell contaminated.
7. Vacuum pressure reading not stable.
8. HVPS not stable.
(table continued)
10-5