There is a red dot flashing on the ceiling of the hotel. What is this?

There is a red dot flashing on the ceiling of the hotel. This is a smoke detector.

The smoke detector adopts ion smoke sensor, which is an advanced technology and stable and reliable sensor. It is widely used in various fire alarm systems, and its performance is far superior to that of gas-sensitive resistance fire alarm.

It can sense the concentration of smoke in the air. The ignition process of fire is generally accompanied by three products: light, heat and smoke. At the beginning of the fire, the temperature of combustion products is low, and it is smoldering, which will produce a lot of smoke. When the smoke enters the smoke detector, it will be detected by the smoke detector and its concentration will be analyzed. When the concentration exceeds the set value, it will trigger a fire alarm.

Types of smoke detectors

1, photoelectric smoke sensing type

It is developed by using the basic property that smoke produced in fire can change the propagation characteristics of light and according to the absorption and scattering of light by smoke particles. Photoelectric smoke detectors are divided into shading type and astigmatism type.

2. Infrared beam smoke sensing type

It is a fire detector that responds to the smoke parameters around a linear narrow strip in the alarm range. The main difference between it and the previous two-point smoke detector is that the linear smoke detector divides the beam transmitter and photoelectric receiver into two independent parts, which are divided into two opposite parts when used, and the middle is connected by a beam. Infrared beam smoke detectors are divided into two types: opposite and reflective.

3. Gas detector

Combustible gas detector adopts high-quality gas sensor, and microprocessor combined with precise temperature sensor can intelligently compensate the drift of gas sensor, which has wide environmental adaptation range, stable work, no need of debugging, simple installation and convenient wiring, and is widely used for safety monitoring in places where combustible gas exists, such as homes, hotels and apartments.