Pressure transmitter with stress isolation depression

Details Pressure transmitter with stress isolation depression Pressure transmitter with stress isolation depression

1990-12-06

1992-03-10

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73706, 361283, G01L 708, G01L 912

Patent

active

050941097

ABSTRACT:
A pressure transmitter has a pressure transducer in a transmitter housing. The transmitter housing includes a groove or a notch defining a flexure closely proximate a housing outer rim. The outer rim receives a large clamping force from a flange and is deflectable about the flexure for reducing transmission of axial and radial components of the clamping force from the housing outer rim to the transducer, which forces can cause distortions to the pressure transducer. Unevenly distributed clamping forces caused by differential thermal expansion of the flange, bolts and housing, are isolated from the transducer thereby reducing measurement errors. Further, transmission of hysteretic radial forces from the transmitter housing to the transducer caused by friction when the flange slides across the pressure transmitter housing, each having different thermal coefficients of expansion, is also reduced. Several types of pressure transducers including capacitive cell transducers can be in the transmitter housing for providing a pressure output indicative of line and differential pressure.

REFERENCES:
patent: 2999385 (1961-09-01), Wolfe
patent: 3140613 (1964-07-01), Hasegawa
patent: 4073191 (1978-02-01), Saigusa
patent: 4168517 (1979-09-01), Lee
patent: 4388833 (1983-06-01), Kuwayama
patent: 4800758 (1989-01-01), Knecht et al.
patent: 4852466 (1989-08-01), Freeman et al.
patent: 4905575 (1990-03-01), Knecht et al.

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