![]() Learn more about how optoelectronic sensors work in our video “WIKA - Level monitoring with optoelectronic switches”. If the liquid in the vessel then drops again and the glass prism is no longer covered by liquid, the infrared light is also able to reach the receiver again and the LED display goes out. The switch then outputs this change as a modified switching signal and the LED display lights up. ![]() However, if the liquid in the container rises and envelops the tip of the optoelectronic switch, the light is refracted by the glass prism into the liquid and no longer reaches the receiver, or only very weakly. So long as the tip does not come into contact with the liquid to be measured, the light is reflected within the prism to the receiver. The light from the LED is shone into the glass prism, causing infrared light to reach the receiver. Inside the glass prism there is a transmitter, a receiver and an infrared light. The most important components of an optoelectronic switch are the glass prism and an LED light source. The model OLS-C51 level switch, as an explosion-protected version, is suitable for use in extreme environments. Thus they feature high resistance against shock, vibration and temperature fluctuations, high IP. WIKA also offers suitable optoelectronic sensors for refrigeration technology or the shipbuilding industry. WIKA meets the harsh operating conditions of mobile working machines with exceptionally robust products which unite the know-how of measurement technology, high-quality materials and the most up-to-date manufacturing processes with a robust design. The model OLS-C20 optoelectronic level switch is suitable, due to its compact design, for high-pressure designs, whereas the model OLS-F1 is particularly suited to sanitary applications. WIKA offers the appropriate optoelectronic level sensor (also known as an optical sensor for short) for every application. Which types of optical sensors are there? They are mostly used in industrial applications, the food and beverage industry or even the pharmaceutical industry. The measurement procedure is thus not influenced by the properties of the liquid and offers high media compatibility. The determination of the level with the cone tip is, across wide ranges, independent of physical characteristics such as refractive index, colour, density, dielectric constant and conductivity. ![]() Due to the variety in designs, the use of optoelectronic sensors is suitable for many industries. The optoelectronic level switch is used for level detection for liquids. Excursions of >8☌ to up to 12☌ for no longer than 15 minutes may occur whilst restocking the refrigerator and are acceptable.
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