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Certified Restrictor Used as Flow Master
FIGURE 83
A certified restrictor can be used to check the accuracy of the flow
transducer. A certified flow master calibrated to flow at multiple pressures
is called a flow linearizer. Obtain flow linearizers in the specific range of
the tester from Uson. These devices are shipped with a pressure-to-flow
chart and a certificate of accuracy.
Read the pressure standard when setting the pressure to produce the air
flow as specified in the pressure-to-flow chart. Always use the more
accurate standard to measure the pressure when using a flow linearizer.
If there is no access to a flow linearizer, use individual fixed restrictors.
These are often used when calibrating Sprint LC at a single flow point. A
single flow point calibration is sometimes acceptable when Sprint LC is
used at just one flow rate or for a simple verification.
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