Fail-safe instrument system

Details Fail-safe instrument system Fail-safe instrument system

1985-02-11

1986-02-25

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340507, 340508, 340612, 324 57R, 324 60R, G08B 2900, G01R 1152

Patent

active

045730407

ABSTRACT:
In an instrument system consisting of a transmitter in one location and a receiver in another location connected by a transmission medium, fail-safe operation is obtained by restricting the output of the transmitter to well-defined levels and interpreting any substantial departure of the received signal from these well-defined levels as a failure. When a failure is detected, alarms or other equipment may be activated, including a control circuit which causes replacement of the defective transmitter or transmission medium, thereby restoring the system to service. An embodiment wherein the transmitter is an admittance-responsive transmitter in a two-wire current loop for monitoring the condition of materials is described.

REFERENCES:
patent: 3757323 (1973-09-01), Pintell
patent: 3786501 (1974-01-01), Marnerakis
patent: 3927404 (1975-12-01), Cooper
patent: 4007456 (1977-02-01), Paige et al.
patent: 4020488 (1977-04-01), Martin et al.
patent: 4103299 (1978-07-01), Swinehart
patent: 4194195 (1980-03-01), Merrell et al.
patent: 4203095 (1980-05-01), Wilson, Jr.
patent: 4363030 (1982-12-01), Maltby et al.

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