SMART
Dust Sensor
SM-PWM-01A
SM-PWM-01A is a dust sensor that detects the The SMART Dust Sensor can detect the small
dust particle concentration in air by using optical particles like cigarette smoke and it can distinguish
sensing method. An infrared light emitting diode (IR small particles like smoke from large house dust by
LED) and a photo-sensor are optically arranged in pulse pattern of signal output.
the device. The photo-sensor detects the reflected
IR LED light by dust particles in air.
Applications Features
Detection for dust in the air, Indoor Air quality Compact size, light weight (about W59x H46x
monitoring D18 mm, 23g)
Air cleaner, Air purifier, Air conditioner PWM (pulse width modulation) output (Low pulse
output)
Outdoor dust monitoring with the IAQ monitor
special mechanical design for customer Able to distinguish small particles of cigarette
smoke from large particles of house dust
Smoke type Fire alarm application by different
sensor adjustments (customer option) The Low pulse width is proportion to particle size
and concentration
Constant forced air convection flow by heater
resister in dust sensor
Lead free and ROHS directive compliant
Minimum particle size can be detected over 1m
(House dust size: avg 20m, yellow dust size: avg
20um, cigarette dust size: avg 1m)
Amphenol
Advanced SensorsSMART Dust Sensor Specifications
Electrical Characteristic Inter nal Schematic
Absolute Maximum Ratings
Parameter Symbol Rating Unit GND
Dust,
Cigarette Smoke
Supply voltage Vcc -0.3 to + 7.0 V Vcc (+5 V)
Operating temperature Topr -10 to 60 C
Signal Output (P1)
Storage temperature Tstg -30 to 80 C
Signal Output (P2)
No Connection
Operating Supply Voltage and Signal Output
(Ta=25 C)
P1: small particle (1~ 2m),
Parameter Symbol Rating Unit
P2: large particle (3 ~10m)
DC 5 5%,
Supply voltage Vcc V
Ripple <100mV
SM-PWM-01A dust sensor cannot count particles
Current or measure quantitatively; the size is only for
Icc < 100 5% mA
Consumption
reference.
Hi : > 4.5V,
*1
Lo : <0.7V,
Signal output P1, P2
Negative Logic Pulse
output
*2
Power up time * 90 Sec
*1. Input impedance 200 k, Pull-Up 10 k, recommend 30 sec
moving average of output signal
*2. To stabilize heater resister and air flow in dust sensor
Recommend Operating Temperature/Humidity
Parameter Rating Unit
Operating Temp./ -10C ~ 45C,
C, %RH
*1
Humidity < 85%RH
*1. Dust sensor can detect the micro size water droplet, like fog
and mist, as particles.
Do not use the dust sensor in high humidly environments as the humid air
is under submicron size and the dust sensor cannot differentiate this.