WIKA OLS-C51 Series Level Sensor Level Switch, 4-20mA Output, Stainless Steel Body, ATEX, IECEx-Rated

The WIKA OLS Optoelectronic level switch is used for monitoring the level of liquids and is designed for medium temperatures. The optoelectronic sensor consists of an infrared LED and a light receptor. The light from the LED is directed at a prism which forms the tip of the sensor. So long as the tip is not immersed in liquid, the light is reflected within the prism to the receiver.

Compact design
Visual indication of the switching status