Differential pressure transmitter

Details Differential pressure transmitter Differential pressure transmitter

1989-08-29

1991-02-26

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

With protective separator

73708, 73721, 338 4, G01L 708, G01L 906, G01L 1306

Patent

active

049952668

ABSTRACT:
In a differential pressure transmitter having pressure receiving diaphragms forming recesses, a center diaphragm therebetween so as to define two chambers filled with pressure transmission medium, first communication passages respectively connecting the two chambers to the recesses and second communication passages respectively connecting the two chambers to pressure measuring chambers. The diameters of the first communication passages are less than predetermined values determined by the viscosity and volume modulus of the pressure passages, and the volume of the pressure-measuring chamber. The frequency of characteristic vibration and gain of the pressure-measuring chamber and the second communication passage in one side is respectively and substantially equal to that in the other side. A drastic transient pressure transmitted to sensors in the pressure-receiving recesses is absorbed by the communication passages and is not transmitted to the sensor in the form of a differential pressure.

REFERENCES:
patent: 4285244 (1981-08-01), Green
patent: 4342318 (1982-08-01), Yamamoto et al.
patent: 4527428 (1985-07-01), Shimada et al.

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