Indoor dust refers to tiny solid particles suspended in indoor air, including dust, smoke, pollen, bacteria, and viruses. These particles can cause adverse human health effects such as respiratory diseases, allergies, and skin problems.

An indoor dust concentration sensor is an instrument that detects the level of particulate matter in the air. It presents data in digital or graphical formats to help users understand indoor pollution levels.

The main working principles of an indoor dust concentration sensor include:

● Optical Scattering: When light hits dust particles, scattering occurs. The sensor calculates the concentration by detecting the intensity of the scattered light.

● Resistance: Dust particles adsorb onto resistive elements, changing their resistance value. The sensor calculates concentration based on these changes.

● Capacitance: Dust particles change the dielectric constant of a capacitor, thereby altering its capacitance value.

When purchasing a sensor, consider the following:

1. Measurement Accuracy: This is the most critical indicator. It is recommended to choose products with accuracy within ±10%.

2. Detection Range: Indoor particles range from PM0.1 to PM100. Choose sensors that can detect PM2.5 and PM10, as these have the most significant impact on human health.

3. Display Mode: Products with both digital and graphical displays are preferred for intuitive data viewing.

4. Additional Features: Some sensors include temperature, humidity, and TVOC monitoring for a more comprehensive overview of air quality.