The Dwyer Optical Level Switch Series (OLS) is best suited for stable process control because it delivers cost efficient, reliable and quick response even with no moving parts on it. These device uses bright red and green LED’s indicators to represent presence or absence of liquid for real time monitoring. The remarkable flexibility feature of these devices come from the optional compositions such as 316 stainless steel, polysulfone and PFA provided applications. Optional mounting can be connected in horizontally or vertically direction. The optical level switch has and LED embedded that emits infrared light. The light will be processed by prism.