Page "government" Paragraph 273
from
Brown Corpus
Precise pressure-volume-temperature measurements on corrosive gases are dependent on a sensitive yet rugged pressure transducer.
A prototype which fulfills the requirements was developed and thoroughly tested.
The transducer is a null-type instrument and employs a stretched diaphragm, 0.001 in. thick and 1 in. in diameter.
A small pressure unbalance displaces the diaphragm and changes the capacitance between the diaphragm and an electrically insulated plate spaced 0.001 in. apart ( for Af ).
Spherical concave backing surfaces support the diaphragm when excessive pressures are applied and prevent the stresses within the diaphragm from exceeding the elastic limit.
Over a temperature range from 25 to 200 Af and at pressures up to 250 atm, an overload of 300 psi, applied for a period of one day, results in an uncertainty in the pressure of, at most, one millimeter of mercury.
Transport properties of air.
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