Thermo Scientific 42iQLS, Instruction Manual

Page: 173 / 318

Calibration
Equipment Required
Thermo Scientific 42iQLS Instruction Manual 4-7
The O
3
generator (ozonator) airflow rate and the NO flow rate must be
adjusted such that the following relationships hold:
min - ppm 2.75
t
x
]
[NO =
P
R
RC
R

)
F
+
F
(
F
] [NO = ] [NO
NO O
NO
STD RC
min 2 <
F
+
F
V
=
t
NO O
RC
R
Use the following procedure to determine the flow conditions to be used in
the GPT system.
1. Determine FT, the total flow required at the output manifold, which
should be equal to the analyzer demand plus 10 to 50 percent excess.
2. Establish [NO]
OUT
as the highest NO concentration that will be
required at the output manifold. [NO]
OUT
should be about equal to
90% of the upper range limit (URL) of the NO
2
concentration range to
be covered.
3. Determine F
NO
as:
]
[NO
F
x
]
[NO
=
F
STD
T
OUT
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
O
as:
F
-
2.75
V
x
F
x ] [NO
=
F
NO
RC NO
STD
O
6. Compute t
R
as:
Determining GPT System
Flow Conditions