Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1977-06-10
1978-11-07
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
G01L 910
Patent
active
041239458
ABSTRACT:
A pressure indicator of the kind comprising a diaphragm box containing two chambers which are completely separated by a resilient diaphragm, each of the chambers communicating via a connecting channel with an associated one of two fluid sources between which a pressure difference is to be established. A metal plate is fastened to the diaphragm, and an inductive sensor is disposed at one of the walls of the diaphragm box, so that a pressure change in at least one of the chambers causes a change in distance between the metal plate and the sensor and, consequently, an output signal from the sensor. According to the invention, overloading of the diaphragm can be prevented in that the bottom wall of at least one of the chambers is located and shaped so as to support the diaphragm in case of a large pressure difference between the two chambers, the opening of the connecting channel into said one of the chambers being located in alignment with said metal plate, whereby the latter will cover said opening upon overloading the diaphragm.
REFERENCES:
patent: 3638497 (1972-02-01), Frenkel
patent: 3946615 (1976-03-01), Hluchan
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