Teledyne API Model 200AU NOX Analyzer Instruction Manual, 02293, Rev. F
7-14
4. Calculate the NO concentration [NO]OUT needed to approximate 90% of the URL of the NO2
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 (FNO) 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 (FO), using Equation 7-4:
F
-
min-ppm 2.75
V
X
F
X
]
[NO
=
FNO
RC
NO
STD
o Equation 7-4
7. Verify that the residence time (tR) 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 (PR) 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 tr is >2 minutes or if PR is <2.75 ppm-min, changes in flow conditions
(FT, FO, FNO) or in the reaction chamber volume (VRC), or both will
have to be made, and tr and PR will have to be re-calculated.
9. After equations 7-5 and 7-6 are satisfied, calculate the diluent air flow (FD) using
Equation 7-7:
FD = FT - FO - FNO Equation 7-7