Exhaust/supply direction indicator

Details Exhaust/supply direction indicator Exhaust/supply direction indicator

1997-05-16

1998-08-25

Lefkowitz, Edward

Communications: electrical

Condition responsive indicating system

Specific condition

340606, 116112, 116264, 116273, 200 819R, 307118, 454256, G08B 2100

Patent

active

057986975

ABSTRACT:
An apparatus for detecting the flow direction of a fluid from an apparatus or between two apparatuses such as a biohoods, fume cabinets, or filters. The device includes a conduit horizontal plane and adapted to receive the fluid. A detecting element is disposed within the conduit and is movable in the direction of fluid flow, the detecting element being in direct contact with the fluid. A sensing element may be coupled to the conduit for determining when the detecting element reaches a predetermined position within the conduit. The circuitry coupled to the sensing element enables selection of a desired flow direction and actuates an alarm when the detected flow direction is other than the one selected.

REFERENCES:
patent: 4486744 (1984-12-01), Pratt et al.
patent: 4906807 (1990-03-01), Siebert et al.
patent: 5142271 (1992-08-01), Bailey et al.
patent: 5183983 (1993-02-01), Knop
patent: 5291182 (1994-03-01), Wiseman
patent: 5410298 (1995-04-01), Wiseman
patent: 5661461 (1997-08-01), Wiseman

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