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Electro-optic level switch / for liquids - SD series
The SD Optical Level Switch is reflected by the prism back to the receiver. When the sensor is wet with liquid, the part of the transmitted light would be reflected back to the receiver while most is lost into the liquid. The received light then changes the signal and controls the switching accordingly. It has the ability to detect and verify the status of the infrared light reflection between the mediums in order to trigger the alarm output.