Threshold compensation and calibration in distributed environmen

Details Threshold compensation and calibration in distributed environmen Threshold compensation and calibration in distributed environmen

1988-04-14

1990-12-11

Black, Thomas G.

Boots, shoes, and leggings

364550, 340630, 340515, G08B 1710

Patent

active

049775278

ABSTRACT:
An environmental detection system particularly useful for fire detection and suppression is provided which ensures high reliability in operation and high reliability in preventing false operation. The preferred system includes a microprocessor-based, software-governed, control panel connected to one or more detector loops. Each loop includes a plurality of parallel-coupled, addressable detectors which send analog signals to the control panel representative of an environmental parameter such as smoke obscuration along with reference and identification signals. The preferred system provides automatic calibration and test of the detectors, automatic testing under load of the backup batteries, flexibility in defining the protective scheme, and storage of history information concerning system alarms and troubles. The preferred system also verifies alarm conditions before actuating an alarm or discharging a fire suppressant.

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patent: 3665461 (1972-05-01), Gnagi
patent: 3882477 (1975-05-01), Mueller
patent: 4254414 (1981-03-01), Street et al.
patent: 4266220 (1981-05-01), Malinowski
patent: 4388616 (1983-06-01), Machida
patent: 4555695 (1985-11-01), Machida et al.
patent: 4556873 (1985-12-01), Yamada et al.
patent: 4644478 (1987-02-01), Stephens et al.
patent: 4688183 (1987-08-01), Carll et al.
patent: 4749871 (1988-06-01), Galvin et al.

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