The optical level switches are ideal for the detection of fluids with low DK value, such as lubrication oil, hydrocarbons or solvents. Optical level sensors detect the change of the refractive index during medium contact at the sensor tip. The sensors with stainless steel housing and glass tip are also suited for the detection of aggressive media, such as solvents. the sensors are available with Ex certification according to ATEX and IECEx.