Assaying A Working No Standard Against A Nist-Traceable No Standard - Thermo Scientific 42i Instruction Manual

Assaying a Working NO
Standard Against a NIST-
traceable NO Standard
Thermo Fisher Scientific
Use the NIST traceable NO standard and the GPT calibration procedure
to calibrate the NO, NO
determine the converter efficiency of the analyzer. Refer to the calibration
procedure in this manual and in the Code of Federal Regulations, Title 40,
Part 50, Appendix F for exact details.
Note Ignore the recommended zero offset adjustments.
Use the following procedure to calculate the NO concentration standard
and NO impurity.
2
1. Generate several NO concentrations by dilution of the NO working
standard.
2. Use the nominal NO concentration, [NO]
concentrations.
3. Plot the analyzer NO response (in ppm) versus the nominal diluted
NO concentration and determine the slope, S
4. Calculate the [NO] concentration of the working standard, [NO]
from:
[NO
]
STD
5. If the nominal NO concentration of the working standard is unknown,
generate several NO concentrations to give on-scale NO responses.
6. Measure and record F
7. Plot the analyzer NO response versus F
which gives [NO]
STD
generated NO concentrations reflect any NO
working standard.
8. Plot the difference between the analyzer NO
F /F . The slope of this plot is [NO
NO T
, and NO responses of the instrument. Also
x 2
NOM
= [NO x
]
S
NOM
NOM
and F for each NO concentration generated.
NO T
/F
NO
directly. The analyzer NO
] .
2 IMP
Model 42i Trace Level Instruction Manual
Calibration
Equipment Required
▲
, to calculate the diluted
.
NOM
STD
and determine the slope
T
responses to the
x
impurity in the NO
2
and NO responses versus
x
,
4-5