The role of PM2.5 sensor in air purifier

Due to the continuous development of industrialization and urbanization, the problem of haze caused by air pollution visits frequently, which seriously affects people's normal life. City regulators also take measures to control air pollution sources, in order to ensure indoor air quality, air purifiers in the home appliance category has also become a hot product, the following is the role of PM2.5 sensors in air purifiers.

 1. The role of air purifiers

The purpose of air purifiers is to improve indoor air quality, refers to the ability to adsorb, decompose or transform a variety of air pollutants (generally including PM2.5, dust, pollen, odors, formaldehyde and other renovation pollution, bacteria, allergens, etc.), effectively improve the cleanliness of the air products, mainly divided into household , commercial, industrial, building. At present, indoor air pollution removal of household and commercial air purification equipment is the main. Air purification equipment can filter air suspended particles, bacteria, viruses, fungal spores, pollen, asbestos, radon gas decay products and other pollutants.

 2.The role of PM2.5 sensor in air purifier

In the current air purification field, PM2.5 sensor has almost become a standard component of air purification equipment, and its role is to monitor the concentration of PM2.5 and other particulate matter in the air.

 The sensor is equipped with a constant light source (e.g., infrared light-emitting diode) inside the sensor, and when air passes through the light, the particles in it scatter it, causing an attenuation of the light intensity. The relative attenuation rate is proportional to the concentration of particulate matter. On the other side of the diagonal with the light source there is a light detector (such as phototransistor), which can detect the light reflected by the particles, and according to the intensity of the reflected light output PWM signal (pulse width modulation signal), so as to determine the concentration of particles. For different particle sizes (e.g. PM10 and PM2.5), it can output several different signals to differentiate them.

 With PM2.5 sensor measurement, the air purifier uses PM2.5 sensor to quickly sense the change of indoor air quality, feed back to the user, and make the gear change can undoubtedly be more effective in cleaning the air as well as energy saving and life extension.