SM-PWM-01A is a dust sensor that detects the dust particle concentration in air by using an optical sensing method. An infrared light emetting diode (IR LED) and a photo-sensor are optically arranged in the device. The photo-sensor detects the reflected IR LED light by dust particles in air. The SMART Dust Sensor can detect the small particles like cigarette smoke and it can distinguish small particles like smoke from large house dust by pulse pattern of signal input. Applications: ?Detection for dust in the air, indoor air quality monitoring ?Air cleaner, air purifier, air conditioner ?Outdoor dust monitoring with the IAQ monitor special mechanical design for customer ?Smoke type fire alarm application by different sensor adjustments (customer option) Features: ?Compact size, light weight (about W59x H46x D18 mm, 23g) ?PWM (pulse width modulation) output (low pulse output) ?Able to distinguish small particles of cigarette smoke from large particles of house dust ?The low pulse width is proportional to particle size and concentration ?Constant forced air convection flow by heater resistor in dust sensor ?Lead-free and ROHS directive compliant ?Minimum particle size can be detected over 1µm (House dust size: avg 20µm, yellow dust size: avg 20µm, cigarette dust size: avg 1µm)