Water-flow detector

Details Water-flow detector Water-flow detector

1988-04-15

1990-09-18

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340610, G08B 2100

Patent

active

049581449

ABSTRACT:
A water-flow detector with an electronic time delay. There is a light-emitting diode and photo-transistor detector pair, a timer comprising an oscillator and a counter, and an alarm relay. The output of the photo-transistor is applied to the reset input of the counter, and the counter output is applied to the relay. The electronic assembly is positioned over the actutator arm of a paddle-type flow sensor assembly in such a way that movement of the arm by water-flow blocks the light path between the emitter and detector, which causes the photo-transistor output to go low, which releases the reset on the counter. The counter counts a predetermined time delay sufficient to avoid nuisance alarms due to temprary surges in the water conduit, and then activates the relay.

REFERENCES:
patent: 1967187 (1934-07-01), Bohner
patent: 2867698 (1959-01-01), Gondolfo
patent: 3284788 (1966-11-01), Hudson
patent: 3641819 (1972-02-01), Kendrick
patent: 3814935 (1974-06-01), Kissel
patent: 4151522 (1979-04-01), Yamauchi
patent: 4295044 (1981-10-01), Anderson et al.
patent: 4791414 (1988-12-01), Griess
Notifier/Emhart Series WFD and WFD-10 Vane Type Water-Flow Indicator, Installation Instructions.

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