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Preparing NO, NO
NO
Calibration Curves
2
Thermo Fisher Scientific
Where:
[NO
]
x
[NO
]
2
The NO
x
Recorder R
Where:
URL = Nominal upper range limit of the NO
5. Record the NO
, and
Use the following procedures to prepare the NO, NO
x
calibration curves.
1. Generate several additional NO and NO
F
or increasing F
NO
2. For each concentration generated, calculate the exact NO and NO
concentrations using the above equations for [NO]
3. Record the NO and NO
4. Plot the analyzer responses versus the respective calculated NO and
NO
concentrations and draw or calculate the respective calibration
x
curves. For subsequent calibrations where linearity can be assumed,
these curves may be checked with a three-point calibration consisting of
a zero point, NO and NO
URL, and an intermediate concentration.
5. Adjust the GPT system to generate a NO concentration near 90% of
the URL of the instrument range selected.
( x
F
NO
[
=
]
NO
x
OUT
= diluted NO
concentration at the output manifold, ppm
OUT
x
= concentration of NO
IMP
2
recorder response will equal:
esponse
(%
scale)
concentration and the analyzer's NO
x
.
D
responses.
x
concentrations of approximately 80% of the
x
[NO
]
[ +
]
)
NO
2
STD
IMP
+
+
F
F
F
NO
O
D
impurity in the standard NO cylinder, ppm
[
]
NO
x
OUT
=
x
100
URL
channel, ppm
x
x
, and NO
x
concentrations by decreasing
x
OUT
Model 42i Instruction Manual
Calibration
Calibration
+
Z
NO
x
response.
2
x
and [NO
]
.
x
OUT
4-13
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