Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-12-22
2000-09-19
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340587, 340594, 340449, 340592, 340626, G08B 1700
Patent
active
061218839
ABSTRACT:
A method for fluid pressure analytical electronic heat and fire detection, and a corresponding heat detector, used for detecting heat and fire, having no moving component, such as a valve, switch, membrane, diaphragm, or similar actuatable device of moving parts, for effecting activation of a warning or alarm signal indicating a condition of excessive heat or fire. The analytical electronic heat detection mechanism is based on electronic circuitry including at least one fluid pressure transducer, logic, and other cooperatively functioning electronic components, for highly accurately and reproducibly, first analyzing a potential condition, and then logically determining, an actual condition of excessive heat or fire. The electronic heat detection mechanism is fully functional, by having at least one fluid chamber closed to any external source of fluid pressure. The invention includes an automatic electronic testing procedure for naturally stimulating the heat detection mechanism for effecting operation. The invention can be implemented in a variety of configurations, including, as a spot type or line-type heat detector, closed or open fluid pressure type heat detector, operating in different ways for monitoring temperature, such as fixed temperature and/or rate of temperature rise, and, in a variety of applications, including incorporating them into multi-unit systems of automatic excessive heat and fire detection, encompassing a wide range of environmental conditions, in a cost effective manner.
REFERENCES:
patent: 4651140 (1987-03-01), Duggan
patent: 5136278 (1992-08-01), Watson et al.
patent: 5621389 (1997-04-01), Fellows
patent: 5691702 (1997-11-01), Hay
UL 521, Heat Detectors for Fire Protective Signaling Systems, Underwriters Laboratories, Inc., 333 Pfingsten Road, Northbrook, IL,60062-2096, USA, 7th Ed., 1999.
Friedman Mark M.
Hofsass Jeffery A.
Nguyen Tai T.
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