Translations:AquaSensor/8/en

An infrared LED and phototransistor were arranged opposite each other on a U-shaped board and protected by housing made from translucent plastic. This sensor was integrated in the instantaneous water heater. The infrared diode then sent its light through the flowing water to the light-sensitive base of the phototransistor, which became conductive when irradiated by light. When the water became cloudy, the light could no longer reach the diode to activate the phototransistor. The absent voltage signal was detected by the microcomputer on the electronic circuit board and this then initiated the required replacement of the water.