To provide an ionization smoke detector emitting a fire signal when smoke exactly arrives at a specified smoke concentration even when an ambient temperature fluctuates.
The ionization smoke detector has: a smoke sensor outputting a sensor output voltage fluctuated with a change in an ion current caused by inflow of smoke; a temperature measurement section measuring the ambient temperature of the smoke sensor; and a signal processing section storing voltage difference to smoke concentration data previously measured at a plurality of temperatures, calculating a voltage difference from the sensor output voltage and a sensor output voltage at no inflow of smoke, obtaining the smoke concentration corresponding to the voltage difference from voltage difference to smoke concentration data at a temperature most close to the ambient temperature, and emitting the fire signal when the smoke concentration exceeds a predetermined threshold or more.
| WO/2015/187249 | IONIZATION AIR FILTERS FOR HAZARDOUS PARTICLE DETECTION |
| JPS52104992A | 1977-09-02 | |||
| JPH0210258A | 1990-01-16 | |||
| JPH0289594U | 1990-07-16 | |||
| JPS6118816A | 1986-01-27 | |||
| JP2002118477A | 2002-04-19 |
Michiharu Soga
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order