Teledyne T200, Руководство по эксплуатации, Страница: 277 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Troubleshooting & Service
275
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 slowly. Wait 10
seconds between adjustments.
Note During these adjustments, the NORM PMT value will fluctuate as the analyzer
continues to switch between NO and NOx streams as well as between measure
and Auto Zero modes.
13. Perform a span point calibration (see Section 9) to normalize the sensor response
to its new PMT sensitivity.
14. Review the slope and offset values:

The slope values should be 1.000±0.300.

The offset values should be approximately 0.0 (-20 to +150 mV is allowed).
06858E DCN7057