Compact and lightweight pneumatic pressure detector for fire detection with integrity switch
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United States of America Patent
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Aug 4, 1992
Grant Date -
N/A
app pub date -
Mar 15, 1991
filing date -
Mar 15, 1991
priority date (Note) -
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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.
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