Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1988-08-25
1990-01-02
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73721, 73766, 338 4, G01L 906, G01L 1302, G01L 1904
Patent
active
048904970
ABSTRACT:
For use in a process control current loop including an external electrical power source that is series connected to the transmitter which is in turn connected to a fixed resistance receiver (that may be in the form of a system controller, a computer, a digital readout device, or the like) that in turn is series connected to the electrical power source, with the transmitter being arranged to provide an analog display of differential pressure or pressure sensed by the instrument and also provide for transmission to the receiver of a signal in the 4-20 milliamp range that is proportional to any changes in the differential pressure or pressure sensed by the instrument.
REFERENCES:
patent: 2722837 (1955-11-01), Dwyer
patent: 3091123 (1963-05-01), Locke
patent: 3397319 (1968-08-01), Locke
patent: 3645140 (1972-02-01), Phillips et al.
patent: 3862416 (1975-01-01), Phillips et al.
patent: 4011759 (1977-03-01), Phillips et al.
patent: 4030365 (1977-06-01), Phillips et al.
patent: 4347745 (1982-09-01), Singh
patent: 4385525 (1983-05-01), Phillips et al.
patent: 4574640 (1986-03-01), Krechmery
patent: 4718279 (1988-01-01), Hestich
Dwyer Instruments, Inc.
Woodiel Donald O.
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