Fine Dust Sensors

Particulate matter is part of the dust in the air. Particulate matter (PM) refers to particles in the air that do not fall to the ground immediately, but remain in the atmosphere for a period of time. Particulate matter is a complex mixture of solid and liquid particles and is divided into different fractions according to their size. Particulate matter PM10, which is smaller than 10 micrometers, reaches the upper part of the lungs. Particulate matter PM2.5, which is smaller than 2.5 microns, penetrates deep into the airways to the bronchioles.

Particulate matter (PM) sensors measure these particles using light scattering. Air passes a focused beam of light and the particles in the air scatter the light. This scattered light is converted into an electrical signal by the photodiode and converted into an output value by the internal microcontroller using algorithms.

They are used for monitoring (indoor) air quality and in air purifiers.