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2. Establish [NO]
OUT
required at the output manifold. [NO]
90% of the upper range limit (URL) of the NO
be covered.
3. Determine F
as:
NO
4. Select a convenient or available reaction chamber volume. Initially a
trial volume may be selected in the range of 200 to 500 cc.
5. Compute F
as:
O
=
F
O
6. Compute t
as:
R
7. Verify that t
< 2 minutes. If not, select a reaction chamber with a
R
smaller V
.
RC
8. Compute the diluent air flow rate as:
9. If F
turns out to be impractical for the desired system, select a reaction
O
chamber having a different V
as the highest NO concentration that will be
OUT
[NO
x
]
F
T
OUT
=
F
NO
[NO
]
STD
[NO
]
x
x
F
V
NO
RC
STD
2.75
V
RC
=
t
R
+
F
F
O
NO
=
-
-
F
F
F
F
D
T
O
NO
and recompute F
RC
Calibration
Equipment Required
should be about equal to
concentration range to
2
-
F
NO
and F
.
D
O
Model 42i Instruction Manual
4-7
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