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Many manometers require calibration, and this may be carried out by the
(1) static method in which simultaneous readings of the manometer under
test and the primary standard are taken when one limb of the manometer and
the standard are connected to a variable pressure source, the other limbs
being connected to a source of constant pressure, or (2) the dynamic
method in which the difference in pressure obtained between a low-speed
atmospheric wind-tunnel hole (static pressure) and the atmospheric static
pressure is used to carry out the calibration. One limb of the manometer
and the low-pressure side of the Chattock-Fry are connected to the
tunnel-wall hole (reference variable pressure), while the other limb of
the manometer is connected to the atmospheric outlet of the Chattock-Fry.
Roberts, 1
Source:
Dictionary of Mining, Mineral, and Related Terms
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