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Calibration
Equipment Required
Cylinder Gas Dilution
A cylinder gas dilution system, shown in
Figure
4–1, can be constructed.
All connections between components in the system should be made with
glass, SS, PTFE or other non-reactive material.
The air flow controller should be capable of maintaining a constant air flow
within ±2% of the required flow rate. The SO
flow controller should be
2
capable of maintaining constant SO
flows within ±2% of the required flow
2
rate. Ensure both flow controllers are properly calibrated. The pressure
regulator for the standard SO
cylinder must have a non-reactive
2
diaphragm and internal parts and a suitable delivery pressure.
External Flow Meter(s)
In order to obtain an accurate dilution ratio in the dilution method used
and Controller(s)
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
. It should be noted that all flows should
1
be corrected to 25 °C and 760 mmHg, and that care should be exercised in
correcting for water vapor content.
Figure 4–1. Cylinder Gas Dilution System
4-3
Thermo Scientific
43iQ Instruction Manual
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