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Flow Calibration Example
Using Flow Meter
FIGURE 82
Figure 82 shows the setup for a flow calibration with a flow meter. The
flow standard (meter) is connected downstream from a flow restricting
device. Connections must be kept as short and direct as possible to get the
best accuracy.
In this arrangement, the pressure regulator is adjusted to supply flow to the
flow restrictor and the flow standard with the correct pressure.
The advantage of this calibration setup is the elimination of the pressure-
to-flow chart required when using a certified restrictor (flow linearizer).
The restrictor used in Figure 82 can be any restrictor that provides enough
restriction to generate flow in the range to be calibrated. Variable flow
control devices can be used if they can reduce the air flow to the required
target flow rates and if they have the stability to ensure adequate
repeatability.
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