SMOKE-SENSITIVE FIRE ALARM Russian patent published in 2003 - IPC

Abstract RU 2210117 C2

FIELD: automatic fire alarms. SUBSTANCE: smoke-sensitive fire alarm has working chamber with dimming components that accommodates radiation source and radiation detector separated by light-tight partition, amplifier, modulator, and threshold devices; operating threshold of one threshold device equals 10-15% of main threshold device value and that of other threshold device equals 200-400% of main threshold. EFFECT: enhanced reliability of alarm due to malfunction protection. 1 cl, 5 dwg

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RU 2 210 117 C2

Authors

Ovchinnikov V.V.

Dates

2003-08-10—Published

2001-05-30—Filed