Multi-zone incipient or actual fire and/or dangerous gas detection system

摘要: A multi-zone detecting system for incipient or actual fires and/or dangerous gas accumulations comprising a sampling obtaining samples of the atmosphere respective zones being monitored and supplying same to common station. The sample gases are continuously drawn off supplied through rotary selector valve sequentially input condensation nuclei particle detector located at sensitivity is individually adjusted in synchronism with operation adjust individual background conditions existing each zone as switched from one next. decreased predetermined short time settling interval following sequential switching prior making measurement respect new which it switched. conversion device can be interposed converting certain that might entrained atmospheres several into supply analysis by detector. With such an arrangement, concentration particles detected would proportion constituency atmospheres. continuous flow provides relatively fast responding detection occurrence alarm condition any monitored. Additional advantageous features described.