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Model 9110T NOx Analyzer EPA Protocol Calibration
Teledyne Analytical Instruments 226
2. Determine the volume (cm3) of the calibrator reaction cell (VRC). 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 (FT) :
Equation 10-2
F
T
= analyzer flow demand (cm
3
/min) x 110/100
If more than one analyzer is to be calibrated at the same time, multiply FT 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:
Equation 10-3
[NO]
OUT
= URL of analyzer (ppm) x 90/100
5. Calculate the NO flow (F
NO
) required to generate the NO concentration [NO]
OUT
:
Equation 10-4
]
[NO
F
x
]
[NO
=
F
STD
T
OUT
NO
6. Calculate the required flow through the ozone generator (F
O
):
Equation 10-5
F
-
-ppm 2.75
V
X
F
X
]
[NO
=
F
NO
RCNO
STD
o
min
7. Verify that the residence time (t
R
) in the reaction cell is <2 min:
Equation 10-6
min2
NOO
RC
R
FF
V
t
8. Verify that the dynamic parameter specification (P
R
) of the calibrator's reaction cell
is >2.75 ppm-min: