Media isolated absolute pressure sensor

Details Media isolated absolute pressure sensor Media isolated absolute pressure sensor

2006-09-19

2006-09-19

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Fluid pressure gauge

Diaphragm

C073S721000

Reexamination Certificate

active

07107854

ABSTRACT:
A method and media-isolated absolute pressure sensor apparatus includes a first sensor (101) to measure a pressure difference between an isolated media (P1) and a second media (Pa). A second sensor (103) measures an absolute (relative to vacuum) pressure of the second media (Pa). Each sensor (101, 103) has its own offset and slope response. An equalizer (217, 219) matches the slopes of the sensors (101, 103), wherein a summing circuit (225) can add the substantially same slope outputs to provide an output signal (227) indicative of an absolute pressure measurement of the isolated media (P1). Offset and temperature compensation of each sensor can also be provided.

REFERENCES:
patent: 4131088 (1978-12-01), Reddy
patent: 5193393 (1993-03-01), Czarnocki
patent: 5471884 (1995-12-01), Czarnocki et al.
patent: 6051853 (2000-04-01), Shimada et al.
patent: 62252176 (1987-11-01), None
patent: 01172719 (1989-07-01), None

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