Figure 4-1. Dilution System Schematic; Flow Meter(S) And Controller(S) - Thermo Scientific 48i Instruction Manual

Calibration
Equipment Required
Flow Meter(s) and
Controller(s)
Pressure Regulator for CO
Standard Cylinder
4-4 Model 48i Trace Level-Enhanced Instruction Manual
must be assembled from individual components, as in Figure 4-1, the
following issues must be considered.
Equipment Damage All connections between components in the system
should be made with glass, Teflon®, or other non-reactive material.
Figure 4–1. Dilution System Schematic
In order to obtain an accurate dilution ratio, 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 Handbook1. 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.
The regulator used must have a non-reactive diaphragm and internal parts,
as well as a suitable delivery pressure.
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