Where should FINETEK SD Optical Level Switch Series

Where should FINETEK SD Optical Level Switch Series operation principle of the refractive index of plastic and air, very different, so the infrared interface of plastic and air, prone to total reflection, while the refractive index of the most liquid of plastic and very close, almost all light is penetrating plastic. Optical level switch that is using its total reflection and penetration phenomena in different media, the basis for judging the level of alert. When the plastic hemisphere photoelectric liquid level switches the left, resulting in a total reflection phenomenon, on the contrary, when immersed in the liquid, then most of the infrared rays penetrate into the liquid plastic hemisphere. Photoelectric Level Switch features an infrared transmitter and receiver, can detect and determine the status of the infrared total reflection or penetrate the plastic surface of the hemisphere, and drives the alarm output circuit. Features? Open collector NPN / PNP output can drive a relay or PLC. ?? Shell is made of PC, POLYSULFONE, SUS304 can be acid, suitable for oil, water, aqueous solutions, alcohol, alcohol ... etc. With power polarity and over-current protection. LED indicates the alarm status light indicates output (output transistor is turned on).