The SM-PWM-01A of the American GE company is a dust sensor that uses optical methods to detect the dust concentration in the air. There is an infrared diode and an image sensor in the dust sensor. Their optical axes intersect. When the airflow with dust passes through the intersection area where the optical axes intersect, 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 a pulse width modulation signal (PWM) that reflects the dust concentration through the signal conditioning circuit.

 GE's SM-PWM-01A dust sensor can detect particles like 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).

Advantages of SM-PWM-01A dust sensor

Compact structure and light weight (W59x H45x D20 mm, ~35g)
PWM (pulse width modulation) output (low pulse output)
Ability to distinguish small particles such as indoor cigarettes from large particles such as dust (pollen, dust, dander)
The low pulse width ratio indicates the particle size and concentration
The dust sensor forms a constant air flow through the heating resistor
Lead-free and ROHS certification
Typical application of SM-PWM-01A dust sensor

Dust monitoring in the air, indoor air quality monitoring
Air filter, air purifier, air conditioner
Outdoor dust monitoring (requires customer's special shape and structure design)
Smoke alarm
SM-PWM-01A Dust Sensor Specification

 

 

specification

parameter

1

Input voltage

DC 5V±5% (CN 1: Pin1=GND, Pin3=+5V), ripple<30mV

2

Power consumption

＜100mA±10%

3

Working temperature, humidity

-10～65℃, below 95% RH

4

storage temperature

-30～80℃

5

size

W 59× H 45 × D20 (mm) max

6

weight

～30 g

7

Detection concentration

Particle size> 1 μm, concentration: 0.01～2.0mg/m3 (particle counter concentration 40,000～800,000 at 1μm)

8

Signal output

Low pulse output

Hi:＞4.5V, Lo:＜0.7V (input impedance 200KΩ)

It is recommended to measure the low pulse duty cycle of the output (%)

The recommended measurement method uses a moving average LPO that calculates the dust concentration from 5sec to 30sec

10

Minimum start-up time

After turning on the power for 30 seconds

 

SM-PWM-01A dust sensor electrical characteristics

 

Absolute maximum rated parameters

parameter

symbol

range

unit

voltage

Vcc

-0.3~7

V