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Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
1. Select an NO standard gas that has a nominal concentration in the range of 50 to 100
ppm. Determine the exact concentration [NO]
STD
by referencing against an NIST-SRM, as
discussed in Section 2.0.7 (Q.A. Handbook).
2. Determine the volume (cm
3
) of the calibrator reaction chamber (V
RC
). If the actual
volume is not known, estimate the volume by measuring the approximate dimensions of the
chamber and using an appropriate formula.
3. Determine the required minimum total flow output (F
T
) using Equation 7-1:
F
T
= analyzer flow demand (cm
3
/min) x 110/100 Equation 7-1
If more than one analyzer is to be calibrated at the same time, multiply F
T
by the number of
analyzers.
4. Calculate the NO concentration [NO]
OUT
needed to approximate 90% of the URL of the
NO
2
analyzer to be calibrated, using Equation 7-2:
[NO]
OUT
= URL of analyzer (ppm) x 90/100 Equation 7-2
5. Calculate the NO flow (F
NO
) required to generate the NO concentration [NO]
OUT
, using
Equation 7-3:
]
[NO
F
x
]
[NO
=
F
STD
T
OUT
NO
Equation 7-3
6. Calculate the required flow through the ozone generator (F
O
), using Equation 7-4:
F
-
min-ppm 2.75
V
X
F
X
]
[NO
=
F
NO
RC
NO
STD
o
Equation 7-4
7. Verify that the residence time (t
R
) in the reaction chamber is <2 min, using Equation 7-5:
min2
FF
V
t
NOO
RC
R
Equation 7-5
8. Verify that the dynamic parameter specification (P
R
) of the calibrator's reaction chamber
is >2.75 ppm-min using Equation 7-6:
75.2
FF
V
FF
F
NOP
NOO
RC
NOO
NO
STDR
Equation 7-6
7-17
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