| 摘要 |
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 |
