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What are the common types of smoke alarms?

by:Rika Sensors     2021-12-08
What are the common types of smoke alarms?

In this era of frequent fires, the invention of the smoke alarm is undoubtedly a great one. It can save thousands of lives every year. The fire development process can be roughly divided into the initial stage, the development stage, and the attenuation and extinguishing stage. The smoke alarm can accurately sense the smoke generated by the fire in the initial stage of the fire, and quickly alarm people. Today I will mainly talk to you about the common types of smoke alarms to help you understand and choose.

Classification of smoke alarms

I. Classification by principle

Ionic smoke alarms

Ionic smoke alarms The working principle is that the radioactive source in the ionization chamber is Am241, and the positive and negative ions produced by ionization move towards the positive and negative electrodes under the action of an electric field. Under normal circumstances, the current and voltage of the internal and external ionization chambers are stable, but when a fire occurs, smoke enters the external ionization chamber and interferes with the normal operation of charged ions, which will cause the current and voltage to change and destroy the internal and external ionization. For the balance between the chambers, when the voltage increase at both ends of the ionization chamber reaches a certain value, the detector will induce this, and the switch circuit action will transmit the alarm information.

Photoelectric smoke alarm

There is an optical labyrinth in the photoelectric smoke alarm, and an infrared pair tube is installed. When there is no smoke, the infrared receiving tube cannot receive the infrared light from the infrared emitting tube When the smoke enters the optical labyrinth, the receiver tube receives infrared light through refraction and reflection, and the intelligent alarm circuit judges whether it exceeds the threshold, and if it exceeds the threshold, an alarm is issued.

It is developed by using the basic property that smoke generated during a fire can change the propagation characteristics of light. According to the absorption and scattering of light by smoke. Photoelectric smoke detectors are divided into shading type and astigmatism type.

Second, according to the transmission method

Most of the wired ones are networked and need an external power supply, but they can be linked to other systems. Relay output, such as water spray, can be linked immediately in the event of an accident. handle.

The wireless one is independent, mainly powered by battery. Compared with wired, it is more convenient to install. There is no need to find an additional power socket, but the battery needs to be replaced regularly. At present, some smart smoke alarms have added a WIFI module, even if it is a stand-alone type, it can upload monitoring data and alarm when the limit is exceeded.

There are currently 4 types of smoke alarms on the market:

1. Independent smoke alarms: do not require wiring, use battery power.

2, bus smoke alarm

3, multi-line smoke alarm (traditional smoke alarm)

4, relay smoke alarm (relay signal output )

RS-YG-N01 smoke alarm adopts photoelectric smoke sensing principle design, realizes fire prevention by monitoring the concentration of smoke, and has built-in smoke sensor and photoelectric smoke device. Smoke moves upwards. When it rises to the bottom of the ceiling and enters the inside of the alarm, the smoke particles will scatter part of the light beam to the photosensitive element. The denser the smoke, the more light is scattered on the photosensitive element. When the light beam scattered on the sensor reaches a certain level, the buzzer will sound an alarm. At the same time, the sensor converts the light signal into an electric signal and transmits it to the automatic fire alarm system to prompt a fire.

The photoelectric smoke device is adopted, which has the characteristics of precise measurement, sensitive response and high stability; it complies with the fire protection GB4715-2005 standard, adopts ceiling-mounted installation, does not require debugging, and can detect 360° Fire. Stable work, beautiful appearance, simple installation. It is widely used in shopping malls, hotels, shops, warehouses, computer rooms, residences and other places for fire safety monitoring.

Smoke alarm is not only an important part of the automatic fire alarm system, but also an important guarantee in people's work and life. It can detect fire in time and emit a strong sound to remind people on the spot to call the police quickly Evacuate quickly, minimizing casualties and economic losses.


Hunan Rika Electronic Tech Co.,Ltd has a great reputation on producing innovative products as the sensor solution.
As manufacturers we are determined to be the very best in sensor solution, regardless of the size, pedigree or inclinations of our competitors.
For Hunan Rika Electronic Tech Co.,Ltd as a whole to adopt an attitude of acceptance toward change and technological innovation, we first have to truly embrace it and practice what they preach. Technological development needs to be more than just another investment, but a complete integration.
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