Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1993-01-07
1994-05-31
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
200 83N, 338 4, 338 42, G01L 708, G01L 906
Patent
active
053158784
ABSTRACT:
A pressure-measuring head for measuring the pressure of a fluid consists of a membrane-like diaphragm (6), which separates a pressure chamber (4) from a reference chamber (7), to which the pressure-sensitive elements, e.g., thick-film resistors or strain gauges, are applied. Under the effect of the pressure in the pressure chamber, these pressure-sensitive elements perform a deflection which is proportional to the pressure occurring in the pressure chamber. An electric contact is switched during simultaneous displacement of the membrane (6) arranged in a sensor housing by a predeterminable distance (19) after a defined pressure value has been reached in the pressure chamber. A measuring head of such a design is also able to assume a swithing function without additional auxiliary energy, besides sending an electrically processable pressure signal.
REFERENCES:
patent: 3735376 (1973-05-01), Kermer et al.
patent: 4613851 (1986-09-01), Hines
patent: 4759222 (1988-07-01), Hattori
patent: 4827240 (1989-05-01), Hafner
patent: 4906977 (1990-03-01), Heuy-Jeng
Dragerwerk AG
Woodiel Donald O.
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