Fluid handling – Pressure modulating relays or followers – With counter-balancing pressure feedback to the modulating...
Patent
1986-09-30
1987-05-19
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
With counter-balancing pressure feedback to the modulating...
137 84, 137486, 1374875, G05D 1600
Patent
active
046659382
ABSTRACT:
A current-to-pressure (I/P) converter provides an output pressure as a function of the magnitude of a variable input DC current. The I/P converter includes a pressure sensor which produces a feedback signal representative of the output pressure. Based upon the feedback signal and the magnitude of the input DC current, an electrical control signal is produced which controls a device for varying the output pressure. The I/P converter also includes a circuit for generating a time-varying signal which is sent back over the current loop wires through which the input DC current flows. The time-varying signal provides an indication of whether the I/P converter is functioning properly. This permits diagnosis of possible causes of control system malfunctions without having to inspect the I/P converter itself.
REFERENCES:
patent: 4325399 (1982-04-01), Frick
patent: 4403297 (1983-09-01), Tivy
patent: 4481967 (1984-11-01), Frick
patent: 4492246 (1985-01-01), Prescott
patent: 4520359 (1985-05-01), Kitagawa et al.
patent: 4527583 (1985-07-01), Simpson
Brown Gregory C.
Cucci Gerald R.
Cohan Alan
Rosemount Inc.
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