Gain-adjusting circuitry for combining two sensors to form a med

Details Gain-adjusting circuitry for combining two sensors to form a med Gain-adjusting circuitry for combining two sensors to form a med

1994-07-05

1995-12-05

Chilcot, Richard

Measuring and testing

Fluid pressure gauge

Diaphragm

73708, 73719, 73721, G01L 1302, G01L 1306

Patent

active

054718848

ABSTRACT:
A media-isolated differential pressure sensor apparatus and corresponding method combines a first signal (207, 209) provided by a first pressure sensor (101), indicative of a difference between a first pressure and second pressure applied across the first pressure sensor, and a second signal (213, 215) provided by a second pressure sensor, indicative of a difference between the second pressure and a third pressure applied across the second pressure sensor (103) to form a differential pressure sensor. Responsive to a pressure span the first signal (207, 209) responds with a slope response different than a slope response of the second signal (213, 215). A slope adjustment circuit (217) enables an adjustment of the slope response of the first signal (207, 209) to correspond to the slope response of the second signal (213, 215), and provides a slope adjusted first signal (221) dependent on the adjusted slope response. A difference circuit (225) provides an output signal (227) dependent on a difference between the slope adjusted first signal (221) and the second signal (223), where the output signal (227) is indicative of a pressure differential sensed between the first pressure sensor (101) and the second pressure sensor (103).

REFERENCES:
patent: 4131088 (1978-12-01), Reddy
patent: 4196382 (1980-04-01), Bryzek
patent: 4222277 (1980-09-01), Kurtz et al.
patent: 4287501 (1981-09-01), Tominaga et al.
patent: 4790192 (1988-12-01), Knecht et al.
patent: 4895026 (1990-01-01), Tada
patent: 5193393 (1993-03-01), Czarnocki

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