Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1991-06-03
1993-02-16
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
296211, 73724, 73726, 73756, 338 4, 361283, G01L 708, G01L 906
Patent
active
051860554
ABSTRACT:
A pressure transducer (50) of the type utilizing a diaphragm (8) with strain sensitive elements (14) formed in the diaphragm surface where the strain sensitive elements (14) are connected to an electronics assembly (4) to produce an electrical output in response to deflection of the diaphragm (8). A diaphragm assembly (26) is bonded to an intermediate support member (28) which is in turn bonded to a main support member (32) which is joined to a support collar (42) and hermetically sealed thereto with a sealing glass (40) where each element (2, 28, 32, 42) has a substantially matched coefficient of thermal expansion so as to reduce any induced thermal stresses and resultant measurement errors where the sealing glass (40) and the support collar (42) have a greater coefficient to produce a compressive type seal at high temperature. A pressure fitting (58) is joined to the external fluid pressure to be measured where the fluid is conducted to the diaphragm (8) through a plurality of passageways (30, 34, 56) in the support elements (28, 32, 44). A main housing (48) encloses the pressure sensing assembly (2) and support members (28, 32, 42) thereby providing protection from the environment.
REFERENCES:
patent: 4127840 (1978-11-01), House
patent: 4771639 (1988-09-01), Saigusa et al.
patent: 4898035 (1990-02-01), Yajima et al.
patent: 4918992 (1990-04-01), Mathias
patent: 4972716 (1990-11-01), Tobita et al.
Hoinsky Christopher C.
Kovacich John A.
Schiesser Robert A.
Williams Donald G.
Eaton Corporation
Uthoff, Jr. L. H.
Woodiel Donald O.
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