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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
7-14
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
NOTE
If t
r
is >2 minutes or if P
R
is <2.75 ppm-min, changes in flow conditions
(F
T
, F
O
, F
NO
) or in the reaction chamber volume (V
RC
), or both will
have to be made, and t
r
and P
R
will have to be re-calculated.
9. After equations 7-5 and 7-6 are satisfied, calculate the diluent air flow (F
D
) using
Equation 7-7:
F
D
= F
T
- F
O
- F
NO
Equation 7-7