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Teledyne API Model 200A NO
X
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 F
T
= 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 (F
NO
) required to generate the NO concentration [NO]
OUT
, using
Equation 7-3:
min/
cm
24.5
ppm5.50
min/
cm
2750ppm45.0
=
F
3
3
NO
4. Calculate the required flow rate through ozone generator (F
O
) using Equation 7-4:
O
33
3
F
=
50.5 ppm x 24.5
cm
/ x 180
cm
2.75 ppm-
- 24.5
cm
/
min
min
min
= 80984
cm
/ - 24.5
cm
/ = 260
cm
/
62 3 3
min
min min
5.
Verify that the residence time (t
R
) 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 (P
R
) 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 (F
D
) required at the mixing chamber, using Equation 7-7:
F
D
= 2750 cm
3
/min - 260 cm
3
/min - 24.5 cm
3
/min = 2465.5 cm
3
/min
7-19
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