Electric restriction indicator with a contactless switch device

Details Electric restriction indicator with a contactless switch device Electric restriction indicator with a contactless switch device

1978-02-24

1980-02-19

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

Specific condition

116264, G08B 2100

Patent

active

041897242

ABSTRACT:
A restriction indicator having a contactless switch device for indicating a restriction in filter elements of fluid filters having an intake side and a negative pressure side. The restriction indicator includes a photointerrupter having a light emitting device and a light receiving device. The light receiving device provides an electrical signal indicative of increased negative pressure in the negative pressure side.

REFERENCES:
patent: 3368520 (1968-02-01), DeMan et al.
patent: 3443365 (1969-05-01), Lee et al.
patent: 3465707 (1969-09-01), Kashiwaba
patent: 3484772 (1969-12-01), Niewyk et al.
patent: 3963891 (1976-06-01), DeMagondeaux
patent: 4014209 (1977-03-01), Emerick

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