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The OS7 high performance optical fluid level switch offers larger mounting threads and robust stainless steel housings that can survive in aggressive environments. A microcontroller based sensor incorporates an infra-red LED and phototransistor which are optically coupled by the tip when the sensor is in air. A range of N and P type output configurations can sink or source up to 800mA, all of which can be configured to output a high or low signal in either a wet or dry state. A stainless steel housing and a polysulfone tip provides excellent chemical resistance.