Nohmi Bosai Kogyo Co., Ltd.

Nohmi Bosai Kabushiki Kaisha

Nohmi Bosai Ltd.

Yoshiaki Okayama

Takashi Handa

An early stage fire detecting apparatus is arranged such that a fire state is discriminated based on a fire probability output from a signal processing network. The fire probability being prepared in such a manner that outputs from a high sensitivity smoke sensor SS and a smell sensor NS, from which responses can be obtained at the early stage of a fire, are subjected to signal processing. Fire information composed of a value at a given moment of smoke and a difference indicating the increase or decrease of the value at a given moment of the smoke and a value at a given moment of smell and a difference indicating the increase or decrease of the value at a given moment of the smell are input to the signal processing network. The signal processing network outputs the above fire probability based on a table (RAM12) defining a fire probability to be obtained from the above fire information and weighting values (RAM13). With this arrangement, an early stage fire can be detected by explicitly excluding non-fire factors such as tobacco, steam vapor, the smell of coffee, and the like.

Early stage fire detecting apparatus

Fire alarm system and method employing multi-layer net processing

Fire alarm system having prestored fire likelihood ratio functions for

Fire alarm system

A fire detector is equipped with a sensor which detects physical quantities such as heat, light or smoke and which, in particular, stores the time when the fire detector responds or generates an alarm and also stores the output level of the sensor at such time and displays these stored data whenever required. It also stores successive output levels of the sensor at each of a series of predetermined time intervals along with the respective time values until the fire detector generates an alarm and displays these stored data whenever required.

Fire detector equipped with a sensor

A sensor for detecting low concentrations of silane gas in air and a process for making the sensor are disclosed. The sensor comprises a silane-sensitive element and a heater to heat the element to 200.degree.-400.degree. C. The element comprises an electrode-equipped alumina porcelain tube coated with a mixture of SnO.sub.2, SbOCl, and Pt. The tube is calcined in air or in an oxidized antimony atmosphere at 600.degree.-850.degree. C. and is exposed to a silane atmosphere at 150.degree.-850.degree. C. to stabilize its properties.

Silane gas sensor and a method of making the same

An element for selectively sensing carbon monoxide which is capable of sensing a lower concentration of CO in a quicker response time at ordinary temperatures without the need of heating the element with better SN and low temperature dependence.

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Tokyo, Japan

Yoshiaki Okayama