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Calibration
Equipment Required
4-4
43iQHL Instruction Manual
Thermo Scientific
In order to obtain an accurate dilution ratio in the dilution method used
for calibration, the flow rates must be regulated to 1%, and be measured to
an accuracy of at least 2%. The meter and controller can be two separate
devices, or combined in one device. The user's manual for the meter should
be consulted for calibration information.
Additional information on the calibration of flow devices can be found in
the
Quality Assurance Handbook
1
. It should be noted that all flows should
be corrected to 25 °C and 760 mmHg, and that care should be exercised in
correcting for water vapor content.
Figure 4–2.
Cylinder Gas Dilution System
The exact SO
2
concentration is calculated from:
F
+
F
F
x
]
SO
[
=
]
SO
[
SO
D
SO
STD
2
OUT
2
2
2
Where:
[SO
2
]
OUT
= diluted SO
2
concentration at the output manifold, ppm
[SO
2
]
STD
= concentration of the undiluted SO
2
standard, ppm
F
SO2
= flow rate of the SO
2
standard corrected to 25
°
C and 760 mm Hg
F
D
= flow rate of the dilution air corrected to 25
°
C and 760 mm Hg
External Flow Meter(s)
and Controller(s)
Summary of Contents for 43iQHL
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