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Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
7.8.12.1 NO Working Standard Traced to NIST NO Standard
First, use the NIST-traceable NO standard and the GPT calibration procedure to calibrate the
NO, NO
x
, and NO
2
responses of the analyzer. Also determine the efficiency of the converter.
Refer to the calibration procedure described in Section 7.8.4.2.
Then, generate several NO concentrations by diluting the NO working standard. Use the nominal
NO cylinder concentration, [NO]
NOM
, to calculate the diluted concentrations. Plot the analyzer
NO response (in ppm) versus the nominal diluted NO concentration and determine the slope,
S
NOM
. Calculate the NO concentration of the working standard [NO]
STD
from:
[NO]
STD
= [NO]
NOM
x S
NOM
A procedure is presented in the TAD in Reference 2.
7.8.12.2 Other Methods of Establishing Traceability
They are:
1.
NO working standard traced to NIST NO2 standard
2.
NO
2
working standard traced to NIST NO2 standard
3.
NO
2
working standard traced to NIST NO standard
NOTE
For further information on calibration by GPT and NO
2
permeation
devices, refer to part 50 of Chapter 1, Title 40 CFR, Appendix F
(revised December 1, 1976) and Reference 13 of that Appendix.
7-33
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