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An optical sensor is mounted in a robust stainless steel housing. It consists of a quartz glass tip with an infrared diode as transmitter and a light-sensitive semiconductor as receiver.

If no liquid wets the sensor tip, the infrared light is completely reflected from the inside of the quartz glass.

However, as soon as it is immersed in the medium, a large part of the transmitted light can be escape into the liquid. This is registered by the receiver, which then initiates a switching process at the PNP transistor output of the device, which is indicated directly by a green LED.

Typical applications

The field of application for optoelectronic level indicators is the detection of limit values in a large number of liquids. The advantage here is that the measurement method is largely independent of physical variables such as refractive index, color, density, dielectric constant or conductivity. The very compact design guarantees minimal space requirements, making measurement in very small volumes possible. The arbitrary mounting position as well as the high pressure and temperature ranges offer a wide range of applications.