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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
9-24
9. Calculate the expected NORM_PMT mV reading.
Multiply the expected span value by 2 to get the mV reading. In this example the expected
span gas concentration is 400 ppb and therefore the expected voltage is 800 mV. As an
alternate method, the voltage can be determined from the graph in Figure 9-1. On the Y-axis
find the calibration concentration in ppb, then determine the expected voltage from the X-
axis.
10. Adjust S2, the HVPS coarse adjustment, on the preamp board to the setting that produces
a signal that is closest to 800 mV. Adjust S1, the HVPS fine adjustment, to the setting that
produces a signal that is closest to 800 mV. Use R19 to trim the reading to 800
±
50 mV. The
readings will periodically go to zero as the Pre-reactor circuit operates, ignore the zero
readings.
11. Allow the instrument to sample span gas for 30 minutes. Then do a span calibration by
CAL-SPAN-ENTR. After the span is completed, do the span quality check procedure in
Table 7-18. This procedure is extremely important to assure that the instrument will operate
with optimum noise, linearity, and dynamic range.
12. Electric Test (ET) Procedure:
A. To adjust ET press SETUP-MORE-DIAG, then scroll to ELEC TEST and press ENTR.
B. Scroll the TEST functions until PMT is displayed.
C. Adjust R27 until 2000 mV
±
200 is displayed.
D. Press EXIT to return to SAMPLE mode.
13. Optic Test (OT) Procedure:
A. To adjust OT press SETUP-MORE-DIAG, then scroll to OPTIC TEST and press ENTR.
B. Scroll the TEST functions until PMT is displayed.
C. Adjust R25 until 2000 mV
±
250 is displayed.
D. Press EXIT to return to SAMPLE mode.
If this procedure does not produce an instrument that will properly span, please contact your
local distributor or the Teledyne API factory. Teledyne API's phone number is on the front page
of this manual.