The ROHEVEL- OPS6202 is optic probes sense the presence or absence of liquid using an infrared light source and detector often used in level measurement. The probes are used in conjunction with a universal controller, which can be used for level alarms or pump control. The universal controller has adjustable time delay and field selectable “fail-safe” settings. The ROHEVEL- OPS6202 is quartz tip electro optic probes are designed for use with quartz tips. The quartz tips are excellent for high pressure or high temperature applications, and also provide excellent corrosion resistance to many chemicals and solvents.