Teledyne 9110T instruction manual Teledyne Analytical Instruments 311

Model 9110T NOx Analyzer Troubleshooting & Service

∙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

Teledyne Analytical Instruments 311