Pmt Sensor Hardware Calibration - Teledyne T200 User Manual

7. Cut off excess length of the wraps.
8. Put the assembly back into the chassis and tighten the mounting screws.
9. Use at least two wrenches to carefully re-attach the tubes to vacuum manifold, flow
meter and/or NO/NOx valve using at least two wrenches.
10. Carry out a detailed leak check (see Section 5.6.11.2),
11. Close the analyzer and reconnect the power cord.
12. Power up pump and analyzer and re-calibrate the instrument after it stabilizes.

PMT SENSOR HARDWARE CALIBRATION

The sensor module hardware calibration is used in the factory to adjust the slope and offset
of the PMT output and to optimize the signal output and HVPS.
If the instrument's slope and offset values are outside the acceptable range and all
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other more obvious causes for this problem have been eliminated, the hardware
calibration can be used to adjust the sensor as was done in the factory.
This procedure is also recommended after replacing the PMT or the preamplifier
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board.
To calibrate the PMT preamplifier PCA:
1. Perform a full zero point calibration using zero air (see Section 4.2.1.1).
2. Display the NOX Stability value either on the NOX plot by clicking the NOX label
or value in the display, or if configured in a Home page meter (Section 2.5.6) or
in the Dashboard (Section 2.5.3).
3. Locate the preamplifier board (PMT Preamp PCA) (see Figure 2-3).
4. Locate the following components on the preamplifier board (Figure 5-19):
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5. Turn the gain adjustment potentiometer 12 turns clockwise or to its maximum
setting.
6. Feed NO gas into the analyzer.
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EXAMPLE: if the reporting range is set at 500 ppb, use 450 ppb NO.
168 Teledyne API T200 NO/NO
Avoid twisting the dryer's white plastic fittings, as this will
Note
result in large leaks, which are difficult to trouble-shoot or fix.
HVPS coarse adjustment switch (Range 0-9, then A-F).
HVPS fine adjustment switch (Range 0-9, then A-F).
Gain adjustment potentiometer (Full scale is 10 turns).
This should be 90% of the upper limit setting for the T200's reporting range:
/NO Analyzer with NumaView™ Software
2 x
083730200A DCN7962