Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1975-03-03
1976-12-07
Queisser, Richard C.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73398R, 73407R, 336 30, G01L 910, G01L 1302
Patent
active
039954935
ABSTRACT:
An improved differential pressure transducer includes a chamber divided by a non-magnetic, electrically conductive measuring diaphragm supported between two support members each of which has a cavity covered with a seal diaphragm. Differential pressure of an incompressible fluid medium to be measured and transduced is applied to the measuring diaphragm, the displacement of which is detected by magnetic core detection coils. The detection coil magnetic cores are joined to the support members through spaces of magnetic material having temperature dependent characteristics opposite to that of the cores to thus neutralize temperatures induced effects. The inductance change in the detection coil upon displacement of the measuring diaphragm provides an electrical signal corresponding to the differential pressure through the provision of an oscillation circuit supplying AC signals to the coils, a control circuit controlling, to a constant value, the sum of the currents in the coils and a circuit for deriving the current differences as an output signal. Advantageously, the oscillation frequency of the output signal of the oscillation circuit is selected to be approximately the reasonant frequency of the detection coils.
REFERENCES:
patent: 2999386 (1961-09-01), Wolfe
patent: 3238479 (1966-03-01), Church
patent: 3241359 (1966-03-01), Glerum
patent: 3274833 (1966-09-01), Ollivier et al.
patent: 3350945 (1967-11-01), Bristol
patent: 3444736 (1969-05-01), Stedman
patent: 3492872 (1970-02-01), Caspar et al.
patent: 3820400 (1974-06-01), Rasso
patent: 3894435 (1975-07-01), Shimada et al.
Queisser Richard C.
Yasich Daniel M.
Yokogawa Electric Works, Ltd.
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