Compact and lightweight pneumatic pressure detector for fire det

Details Compact and lightweight pneumatic pressure detector for fire det Compact and lightweight pneumatic pressure detector for fire det

1991-03-15

1992-08-04

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340626, 73 405R, 200 814, 200 83N, G08B 1704

Patent

active

051362783

ABSTRACT:
A pneumatic pressure detector for use in an overheat or fire alarm system utilizes a known capillary type sensor tube which has absorbed in it a gas. Overheat or fire condition causes the gas to expand which then actuates an associated deformable diaphragm to close an electrical switch. To insure that the system pressure is maintained and no fault condition exists, the compact detector also uses a deformable diaphragm associated with an integrity switch which opens if the pressure falls below normal. Both of these diaphragms are juxtaposed to form the plenum to which the sensor tube is attached thereby saving weight and space.

REFERENCES:
patent: 1986479 (1955-01-01), Lowe
patent: 3234537 (1966-02-01), Lindberg
patent: 3760393 (1973-09-01), Lindberg

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