Alarm system

Details Alarm system Alarm system

1981-04-30

1984-07-10

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

340511, 340661, 34087027, G08B 1700

Patent

active

044595832

ABSTRACT:
An alarm system which includes at least one primary detecting device that provides an analog output signal. The rate of change of the analog output signal is monitored, and an alarm signal is generated when the rate of change exceeds a preset limit. The analog output signal is also compared with a first reference level signal to provide a pre-maintenance warning signal when the analog output signal reaches the first reference level.

REFERENCES:
patent: 3467956 (1969-09-01), Moreines
patent: 3559198 (1971-01-01), Moreines
patent: 3836854 (1974-09-01), Wehman
patent: 3919703 (1975-11-01), Stevens
patent: 4110687 (1978-08-01), Sneed, Jr.
patent: 4152656 (1979-05-01), Udvardi-Lakos

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