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What sensors are used in fire alarms?

Update: 2020-06-08 15:01 Source: LUFTMY

A total of 233,000 fires were reported nationwide in 2019, killing 1,335 people, injuring 837 and causing direct property losses of 3.612 billion yuan, according to the National Fire and Rescue Bureau.It can be seen that fire prevention is very necessary, in addition to the correct use of fire and electricity, learning fire response measures.Fire alarms and fire extinguishers are also important safety equipment. Some public places and apartments are equipped with fire alarms and automatic fire extinguishing systems, which greatly reduce the risk of fire. What sensors are used in fire alarms?

What sensors are used in fire alarms

Ion smoke sensor

It contains a small amount of radioactive substances in the ionization chamber, which can make the ionized indoor air become a conductor and allow a certain current to pass through the air between two electrodes. The radiation causes the local air to become ionized and forms an ion current under voltage action, which gives an effective conductivity to the ionization chamber.When smoke particles enter the ionized region, they engage with ions and reduce the conductivity of the air, resulting in reduced ion movement.When the electrical conductivity is below a predetermined value, the fire alarm goes off.

Infrared beam smoke sensor

It is a fire alarm that responds to the smoke parameters around a narrow linear strip in the warning range.The main difference between it and the previous ion smoke sensor is that the linear smoke detector divides the beam emitter and photoelectric receiver into two independent parts. When used, the two parts are divided into opposite parts, and the middle part is connected with the beam.The infrared beam smoke detector is divided into two types: the opposite type and the reflection type.

Air sampling smoke sensor

If necessary, air samples will be filtered and treated. Invisible smoke particles in the air will be analyzed to determine the area of fire (sample tube). A four-stage programmable alarm threshold will be set and an alarm will be issued through relay output or communication network.

GDS06 Infrared PM2.5 Sensor Model
GDS06 Infrared PM2.5 Sensor Model

Photoelectric dust sensor

In addition to the burning fire, the fire is usually accompanied by a strong smoke.The working principle of fire alarm is to detect the concentration of smoke in the air through the internal dust sensor, so as to give early warning to the fire.The smoke we see in life is actually tiny solid particles floating in the air.These solid particles have a reflection effect on the light, and the photoelectric dust sensor takes advantage of this property. Through the internal image sensor, it detects the infrared light reflected by the INFRARED led through the airflow with dust particles and then determines the concentration of dust in the air.The higher the concentration, the stronger the reflected light.When the dust sensor in the smoke alarm detects that the concentration exceeds the set value, the circuit will generate an alarm signal to start the on-site alarm equipment.For networked devices, the wireless communication module can be used for remote fire rescue, and relevant location information can be sent to the alarm platform for timely rescue.

Photoelectric dust sensor LUFTMY recommended GDS06 infrared dust sensor, it is small in size, cost-effective, embedded in the fire alarm can be real-time monitoring dust concentration, in case of fire to provide timely alarm.

TAGsensor applications fire alarms smoke sensors