1. GE's sm-pwm-01c is a dust sensor (air quality sensor) that uses optical methods to detect dust concentration in the air. In the dust sensor, there is an infrared diode and an image sensor. Their optical axes intersect. When the airflow with dust passes through the intersection area of optical axes, the dust reflects the infrared light, and the reflected light intensity is proportional to the dust concentration. The image sensor detects the infrared light emitted by the infrared diode reflected by the dust, and outputs the pulse width modulation (PWM) signal reflecting the dust concentration through the signal conditioning circuit.
2. GE's sm-pwm-01c dust sensor (air quality sensor) can detect particles with the size of cigarette particles, and can also detect large particles such as indoor dust. It can distinguish the concentration of different dust particles by outputting two different pulse width modulation signals (PWM).
3. Advantages of sm-pwm-01c dust sensor (air quality sensor)
Compact structure, light weight (w59x h45x D20 mm, ～ 35g)
PWM (pulse width modulation) output (low pulse output)
It can distinguish small particles such as indoor cigarettes from large particles such as dust (pollen, dust, hair)
The width ratio of the low pulse indicates the particle size and concentration
The dust sensor (air quality sensor) forms a constant air flow by heating the resistance
Lead free and ROHS certification
4、 Sm-pwm-01c dust sensor Typical applications
Dust monitoring in the air, indoor air quality monitoring
Air filter, air purifier, air conditioner
Outdoor dust monitoring (special shape and structure design required)