Two wire flow rate transmitter

Details Two wire flow rate transmitter Two wire flow rate transmitter

1978-09-15

1980-12-16

Yasich, Daniel M.

Measuring and testing

Volume or rate of flow

Using differential pressure

364510, 364814, G01F 138

Patent

active

042389658

ABSTRACT:
The disclosed transmitter operates in a two wire process control system to modify a loop current through the two wires that are representative of pressure drop through an orifice into a second loop current through the two wires that are representative of flow rate through the orifice. To accomplish this, the transmitter generates a first voltage that is representative of the first loop current. Then, it generates a second voltage proportional to the square root of the first voltage, and generates a third voltage proportional to the difference between the first and second voltages. The transmitter then sinks an additional current in the two wires proportional to the third voltage. The sum of the first loop current and the additional current equals the second loop current.

REFERENCES:
patent: 3078713 (1963-02-01), Schlieder
patent: 3097527 (1963-07-01), Davis et al.
patent: 3328569 (1967-06-01), Brewster
patent: 3713337 (1973-01-01), Stroman
patent: 3732406 (1973-05-01), Schlatter
patent: 3934127 (1976-01-01), Schlatter et al.
patent: 3965344 (1976-06-01), Romo

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