Optical sensors react to a change of the refraction index within the proximity of the sensor tip when being immersed into fluid. The sensor does not have to be adjusted. In rare cases, the container wall or particles within the fluid may reflect the light emitted by the sensor and thus interfere with the fluid detection. A trial run is recommended in such instances. The sensors are designed to be used with the respectively listed fluids under normal conditions. The chemical compatibility and technical suitability of the sensor should be tested when used with unlisted fluids.
Level controller
Level controllers without moveable parts are available in various versions and are extremely resistant to soiling. Capacitive level controllers are available for gases to -200 °C as well as hot glue up to +230 °C. PTFE and PEEK are here the preferred materials because they prevent adhesions. Opto fill sensors with glass or PSU tip do not require a medium adjustment and are simply added top the tank. These sensors are also available as explosion-proof units in accordance with ATEX. Ultrassonic sensors, pressure controllers or the capacitive high-temperature measuring probe KFA continuously monitor and log fill levels.