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The temperature detector (referred to as temperature sense) mainly uses thermal elements to detect fire. In the initial stage of the fire, on the one hand, a large amount of smoke is generated, on the other hand, the substance releases a large amount of heat during the combustion process, and the ambient temperature rises sharply. The thermal element in the detector undergoes a physical change, responding to abnormal temperature, temperature rate, and temperature difference, thereby converting the temperature signal into an electrical signal and performing an alarm process.
The temperature detector is generally composed of three parts: a temperature sensing element, a circuit and an alarm. The temperature sensing components are divided into three types: fixed temperature type, differential type, fixed temperature differential type temperature sensitive fire alarm, and the temperature sensing area is generally 30 to 40 square meters.
A spot type temperature detector should be selected in one of the following conditions:
1) Relative humidity is often greater than 95%;
2) smokeless fires;
3) There is a lot of dust;
4) There are smoke and vapor retention under normal conditions;
5) kitchen, boiler room, generator room, drying workshop, etc.;
6) smoking room, etc.;
7) Other halls and public places where smoking detectors are not suitable.
The smoke detector is to prevent fire by monitoring the concentration of smoke. The smoke detector is equipped with ion smoke sensor. The ion smoke sensor is a technology with advanced technology and stable and reliable operation. It is widely used in various types. In the fire alarm system, the performance is far superior to the fire alarm of the gas sensor.
It has a radiation source é•…241 inside and outside the ionization chamber, and the positive and negative ions generated by ionization move to the positive and negative electrodes under the action of the electric field. Under normal conditions, the current and voltage of the internal and external ionization chambers are stable. Once there is smoke, escape the ionization chamber. Interfering with the normal movement of charged particles, the current and voltage will change, destroying the balance between the internal and external ionization chambers, so the wireless transmitter sends a wireless alarm signal to inform the remote receiving host to transmit the alarm information.
For places that meet one of the following conditions, a point-type smoke detector should be selected:
1) Restaurants, hotels, teaching buildings, office buildings, bedrooms, offices, etc.;
2) Electronic computer room, communication room, movie or TV screening room, etc.;
3) Stairs, walkways, elevator rooms, etc.;
4) library, archives, etc.;
5) Locations with electrical fire hazards.