Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1993-11-30
1996-06-04
Chilcot, Richard
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73754, G01L 100
Patent
active
055222668
ABSTRACT:
A pressure transducer (10) for measuring fluid pressure in a fluid path comprising a strain gauge circuit (37) of thick film piezoresistors formed on an alumina diaphragm (36) in a Wheatstone bridge configuration. Each resistance leg of the bridge typically includes a thick film measuring piezoresistor (R1A) to which selected thick film patch-in piezoresistors (R1B, R1C, R1D, R1E) are selectively connected to create a measuring resistance network (PN1). The measuring resistance network is adjusted to a predetermined resistance value to balance and optimize the electrical symmetry of the bridge. The pressure transducer (10) includes a mechanical stop member (46) located adjacent the alumina diaphragm (36) such that the fully deflected diaphragm contacts the stop thereby physically preventing the diaphragm from deflecting an amount that would cause the diaphragm to rupture.
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Brunner Glen D.
Eland Michael P.
Frank Thomas P.
Nicholson Warren B.
Patzer Charles R.
Biegel Ronald L.
Chilcot Richard
Medex Inc.
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