Fail-safe instrument system

Details Fail-safe instrument system Fail-safe instrument system

1979-11-30

1982-12-07

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340507, 340508, 340612, 324 60R, G08B 2900

Patent

active

043630308

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: 1462057 (1923-07-01), Wold
patent: 3202976 (1965-08-01), Rowell
patent: 3746975 (1973-07-01), Maltby
patent: 3786501 (1974-01-01), Marnerakis
patent: 3879644 (1975-04-01), Maltby
patent: 3993947 (1976-11-01), Maltby et al.
patent: 4146834 (1979-03-01), Maltby et al.

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