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Teledyne API Model 200A NO
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Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
7 CALIBRATION AND ZERO/SPAN CHECKS
There are several ways to check and adjust the calibration of the M200A. These different
methods are summarized in Table 7-7-1. In addition, all of the methods described in this section
can be initiated and controlled via the RS-232 port.
We strongly recommend that SPAN CALIBRATION be done with NO span gas, although it is
possible with NO
2
(see Section 7.6), or with gas from a GPT system. SPAN CHECKS can be
done with either NO only, NO
2
only or a mixture of NO and NO
2
(GPT).
Zero air used for all calibration procedures, including GPT, should have < .1 ppb NO or NO
2
,
less than 1 ppb of major interferents such as SO2 and NH3, and a dew point of -5
o
C or less. The
calibration gasses should be from a reliable supplier, since the quality of the tank concentration
values ultimately determines the accuracy of the analyzer. EPA protocol calibration gasses
should be used for EPA monitoring, see Section 7.8.
NOTE
If you are using the M200A for EPA monitoring, only the
calibration method described in Section 7.8 should be used.
NOTE
If there are any problems completing any of the following procedures,
refer to Section 9.2.8 and 9.2.9 - Unable to Span or Zero.
7-1
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