The difference in appearance mainly lies in that the appearance of smoke and temperature fire detectors is different. The lower part of the smoke fire detector is round, and the lining package is provided with wire mesh. The lower part of the temperature sensing fire detector is in the shape of an opening, which is like a water drop glass ball.
The difference in use mainly lies in the smoke, as long as the smoke, dust, water vapor, etc. are tested, while the temperature is mainly used to alarm the detection of 67 degrees to 91 degrees.
In principle, the photoelectric smoke detector has a black maze inside, and blowing smoke to the maze can alarm. Generally, the thermistor is used as the temperature sensor. In order to detect the fire as quickly as possible, the thermistor should be exposed. In this way, the sensor is easy to be damaged in the transportation project, so it also needs plastic for protection.