Teledyne API Model 200A NOX Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
Because low flows are difficult to control and measure, it is often advantageous to set a higher
total flow than needed. In this example, we will let FT = 2750 cm3/min
2. Determine the highest NO concentration, [NO]OUT, required at the output manifold, using
Equation 7-2:
[NO]OUT = 0.5 ppm (90/100) = 0.45 ppm
3. Calculate the NO flow (FNO) required to generate the NO concentration [NO]OUT, using
Equation 7-3:

min/

cm

24.5

ppm5.50

min/

cm

2750ppm45.0

=

F3
3
NO
4. Calculate the required flow rate through ozone generator (FO) using Equation 7-4:
O
33
3
F = 50.5 ppm x 24.5cm / x 180 cm
2.75 ppm- - 24.5cm /
min
min min
= 80984 cm / - 24.5 cm / = 260 cm /
62 3 3
min min min 5. Verify that the residence time (tR) in the reaction chamber is <2 min using Equation 7-5:
min63.0
min/
cm
5.24min/
cm
260 cm
180
= t 33
3
R
6. Verify the dynamic parameter specification (PR) of the calibrator reaction chamber using Equation 7-6:
minppm75.2
min/
cm
5.24min/
cm
260 cm
180
min/
cm
5.24min/
cm
260
min/
cm
24
ppm5.50= P 33
3
33
3
R
7. Calculate the diluent air flow (FD) required at the mixing chamber, using Equation 7-7:
FD = 2750 cm3/min - 260 cm3/min - 24.5 cm3/min = 2465.5 cm3/min
7-19
PRINTED DOCUMENTS ARE UNCONTROLLED