Fluid handling – Pressure modulating relays or followers
Patent
1987-07-08
1989-08-22
Wayner, William E.
Fluid handling
Pressure modulating relays or followers
1374875, 73754, 236 84, 323365, F15B 500, G05D 2300
Patent
active
RE0330280
ABSTRACT:
A temperature compensation circuit is provided which can be used for span temperature compensation in an electropneumatic transducer system and which includes a constant current generator circuit coupled to a bridge of piezo resistances in a pressure transducer to supply a constant current through one piezo resistance of the bridge to common. The Electropneumatic Transducer System includes a zeroing circuit, a voltage chopping circuit, a linearity correction circuit, a low-current shut-off circuit, and a high-current shut-off circuit to provide hard turn-ons and hard turn offs of the system at the lower and upper ends of the pressure output range or span. The Electropneumatic Transducer System also includes a voltage railsplitting circuit arrangement to minimize the operating currents and voltages. With these features, the Electropneumatic Transducer System is particularly adapted for use in hazzardous combustible atmospheres where Intrinsic Saftey and accuracy are required.
REFERENCES:
patent: 3882881 (1975-05-01), Machenzie et al.
patent: 4202218 (1980-05-01), Romo
patent: 4337665 (1982-07-01), Sato et al.
patent: 4444056 (1984-04-01), Romeo et al.
patent: 4481967 (1984-11-01), Frick
patent: 4492246 (1985-01-01), Prescott et al.
Dresser Industries Inc.
Wayner William E.
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