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Dust sensor used in air conditioning

Update: 2019-12-17 17:39 Source: LUFTMY

With the development of science and technology and the improvement of people's living standards, air conditioning has now entered every household, many people can not do without air conditioning. There are many kinds of sensors used in air conditioning, the most important of which are temperature sensor and humidity sensor. They play an important role in air conditioning. Now the dust in the urban environment is increasing day by day. Many air conditioning manufacturers have tried to add the dust sensor to the air conditioner. Adding the dust sensor to the air conditioner has become a new trend.

Air pollutant
Air pollutant

The dust sensor can monitor pm1.0, PM2.5 and PM10 particles at the same time. The air conditioner equipped with the dust sensor can update the indoor air according to the dust data monitored in real time, and control the dust concentration in the indoor environment within a reasonable range, so as to avoid the harm to human health caused by the high dust concentration. In addition, based on the monitoring data of dust concentration, the air intake of fan can be controlled to meet the requirements of energy conservation and environmental protection.

What is a dust sensor?

Dust sensor, also called PM2.5 sensor, can be used to detect the mass concentration of dust in the air around us, that is, the value of PM2.5. In aerodynamics, the dust whose diameter is less than 10 μ M can enter the alveolar area is usually called respiratory dust. Most of the dust particles with a diameter of more than 10 μ m are deposited by impact, and deposited in the nasopharynx when inhaled by human body. The dust particles with a diameter of less than 10 μ M can enter the deep part of respiratory tract. However, most of the dust deposited in the alveoli is below 5 μ M.

Air conditioning with built-in dust sensor
Air conditioning with built-in dust sensor

The dust sensor adopts the principle of laser scattering. The light emitted by the laser is scattered by the dust. The scattered light is transformed into electrical signal (pulse) by photoelectric converter, the intensity of light is proportional to the intensity of electrical signal converted by photoelectric converter, and the larger the particle is, the larger the pulse signal is (wave peak value). The number concentration of each particle size can be obtained by the wave peak value and pulse number at this time.

HPD05 Infrared dust sensor
HPD05 Infrared dust sensor

PM2.5 air quality detection module HPD05 sensor has a built-in infrared light-emitting diode and a highly sensitive photoelectric receiving sensor. When the infrared light-emitting diode emits light, it will produce reflected light when encountering dust. The photoelectric sensor reflects the concentration of dust in the air by detecting the intensity of the reflected light. The sensor directly outputs PWM signal, and the PWM width is the current concentration number Value.HPD05 air detection instrument has stable detection capacity, high production efficiency and double advantages. The monitoring sensor hpd05 has the characteristics of small volume, high precision, low power consumption, short response time and stable operation under high dust concentration. The air conditioning dust sensor can be used in PM2.5 detection instrument.

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