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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 311
Gain adjustment potentiometer (Full scale is 10 turns).
5. Turn the gain adjustment potentiometer 12 turns clockwise or to its maximum
setting.
6. Feed NO gas into the analyzer.
This should be 90% of the upper limit setting for the 9110T’s reporting range:
EXAMPLE: if the reporting range is set at 500 ppb, use 450 ppb NO.
7. Wait until the STB value is below 0.5 ppb
Figure 12-8: Pre-Amplifier Board Layout
8. Scroll to the NORM PMT test function on the analyzer’s front panel.
9. With the NO gas concentrations mentioned in Step 5 above, the norm pmt value
should be 900 mV.
10. Set the HVPS coarse adjustment to its minimum setting (0).
11. Set the HVPS fine adjustment switch to its maximum setting (F).
Set the HVPS coarse adjustment switch to the lowest setting that will give you
just above the target value for NORM PMT signal.
12. Adjust the HVPS fine adjustment such that the NORM PMT value is close to the
target value.
It may be necessary to go back and forth between coarse and fine adjustments
if the proper value is at the threshold of the min/max coarse setting.
ATTENTION
COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Do not overload the PMT by accidentally setting both adjustment switches
to their maximum setting. Start at the lowest setting and increment