E C O P H Y S I C S Gas Phase Titration
CLD 780 TR / July 2000 155
3. Determine F
NO
as
F
NO
= ( [NO]
OUT
x F
T
) / [NO]
STD
[5]
4. Select a convenient or available reaction chamber volume. Initially,
a trial V
RC
may be selected to be in the range of approximately 300
to 500 scm
3
5. Compute F
O
as
F
O
=
{
([NO]
STD
x F
NO
x V
RC
) / 2.75
}
0.5
– F
NO
[6]
6. Compute t
R
as
t
R
=V
RC
/ ( F
O
+ F
NO
)[7]
Verify that t
R
<2 minutes. If not, select a reaction chamber with a
smaller V
RC
.
7. Compute the diluent air flowrate as
F
D
=F
T
– F
O
– F
NO
[8]
where:
F
D
= Diluent air flowrate, scm
3
/min
8. If F
O
turns out to be impractical for the desired system, select a reac-
tion chamber having a different volume, V
RC
, and recompute F
O
and
F
D
.
NOTE: A dynamic parameter lower than 2.75 ppm-min may be used if
it can be determined empirically that quantitative reaction of O
3
with
NO occurs. A procedure for making this determination as well as a
more detailed discussion of the above requirements and other related
considerations is given in Reference 1.
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