Safety barriers for 2-wire transmitters

Details Safety barriers for 2-wire transmitters Safety barriers for 2-wire transmitters

1988-05-31

1990-10-30

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

361 54, 361 57, 361 58, 207326, 207327, H02H 320

Patent

active

049673025

ABSTRACT:
A single-channel shunt-diode safety barrier for energizing a 2-wire transmitter, particularly for use in process control, incorporates within the barrier a floating d.c. power supply or its equivalent to enable the barrier to deliver into an earthed load a direct current substantially equal to that which it draws from the transmitter. The floating d.c. power supply is preferably derived from an external d.c. power source via a transformer or diode-pump circuit within the barrier itself. The barrier is enabled to pass superimposed digital or frequency signals in both directions to and from the transmitter.

REFERENCES:
patent: 3309542 (1967-03-01), Elliot
patent: 3445679 (1969-05-01), Mayer et al.
patent: 3818273 (1974-06-01), Nakashima
patent: 3976170 (1976-08-01), Hogan
patent: 4412265 (1983-10-01), Buuck
patent: 4542302 (1985-09-01), Griffioen

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