Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1992-12-10
1995-07-25
Dougherty, Thomas M.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
323277, 323908, 361 91, H02M 704
Patent
active
054368243
ABSTRACT:
An AC powered field mounted process control transmitter includes an inrush current limiter which prevents excessive current flow to other circuitry in the transmitter. The transmitter senses a physical parameter, such as flow, and comprises a source of current, a current driven sensing circuitry, the inrush current limiter and measurement electronics for converting the sensed parameter into a transmitter output. The limiter includes a reference voltage source and is in series between the current source and the current driven sensing circuitry. When inactive (i.e. not limiting current), the limiter responds to the series current through itself so that when such current exceeds a predetermined maximum level the limiter becomes active and prevents further current flow. The limiter remains active until the voltage across itself is less than the reference voltage, at which time the limiter becomes inactive.
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"Non-incendive Electrical Equipment for Use in Class 1, Division 2 Hazardous Locations"--Industrial Products Published in Mar. 1987, pp. 2-27.
"Magnetic Flowmeter Fundamentals"--by Rosemount Aug. 1989 pp. 2-8.
"Model 8712C Magnetic Flowmeter Transmitter"--by Rosemount Sep. 1990 pp. 2-8.
Coursolle Thomas P.
Royner Bruce D.
Berhane Adolf
Dougherty Thomas M.
Rosemount Inc.
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