Pressure Calibration - Fluke 5080A Manual

Pressure calibration

Pressure calibration is the comparison of the output
of a device used to measure pressure with that of
another pressure measurement device, or pressure
measurement standard. This usually involves
plumbing the unit under test (UUT) to the standard
device and generating a common pressure in the
measurement circuit. The outputs of the devices are
compared at one or more pressures, typically from
the lowest to highest readings of the UUT's full scale
range, or the range over which it is normally used.
The comparison process can be performed in
a chain from the highest level of fundamental
pressure realization down to everyday pressure
measurement devices, such as analog gauges,
transducers and transmitters, to ensure that
pressure measurements are accurate and comply
with accepted or mandated standards.
Pressure calibration
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The test fluid inside a pressure calibration system
may be liquid or gas depending on the application.
In general, gas (usually compressed nitrogen or
air) is used for cleanliness and precision at lower
pressures, and liquids (usually oil or water) are often
used for safety, leak integrity, and ease of pressure
generation at higher pressures above 7 MPa to
40 MPa (1,000 psi to 6,000 psi). There is a great
deal of overlap in the actual ranges for which liquid
or gas may be used practically, as reflected in the
range of Fluke Calibration instruments that are
specialized for each type of test fluid.
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