When washing hands, the user’s hands are placed under the nozzle and before the sensor. The activated sensor will further activate a pump that<unk>  a premeasured amount of<unk>  from the nozzle. Radar-based sensor This kind of sensor sends out bursts of microwave or ultrasound energy and waits for the energy to reflect back. In a stagnant situation, the energy will bounce back in a normal pattern. When hands are placed in the basin, the energy emitted from the sensor will bounce back irregularly which triggers the dispensation of<unk> . Modern sensors used in electronic faucets, electronic flush valves and electronic<unk><unk> s use Infrared light with wavelength in the range of 850 nm. The sensor employs an emitter and a collector. The emitter emits pulses of infrared light while the collector, which is positioned to face in the same direction as the emitter, "sits" dormant waiting to sense the emitted pulses. When no hands are present in front of the device, no reflection of light takes place, and therefore, no pulse is sensed. When hands are present in the path of the emitted light, a portions of the emitted infrared light is bounced back in the direction of the collector which then becomes excited by the light (in the event a photodiode is used) and generates voltage to switch the pump on. If a photo transistor is utilized, then the photo transistor, upon sensing the infrared pulse, will simply switch the pump on. Photo sensor This mechanism is composed of two parts, a source of focused light (usually a laser beam) and a light sensor. When the user’s hands are placed in line of the beam of light, the pump mechanism is activated by the disruption that is sensed by the light sensor. Passive infrared sensor Infrared sensors detect infrared energy that is emitted by one’s body heat. When hands are placed in the proximity of the sensor, the infrared energy quickly fluctuates. This fluctuation triggers the pump to activate and<unk> the designated amount of<unk> .
Automatic soap dispenser
Hand sanitizer
Adult diaper
Cuticura soap
Composting toilet
Heat and moisture exchanger
Safety syringe
Tooth polishing