Liquid Level Control Relays detect & control levels of conductive liquids such as fresh water, seawater, sewage & coffee. They provide a low voltage signal (typically 5VDC pulsed to prevent electroplating issues) to a probe or probes and a common connection on the tank.

Level sensors are used to monitor and regulate levels of a particular free-flowing substance within a contained space. These substances are usually liquid; however, level sensors can also be used to monitor some solids such as powdered substances. Level sensors are widely used industrially. Cars use liquid level sensors to monitor a variety of liquids, including fuel, oil and occasionally also specialist fluids such as power steering fluid. They can also be found in industrial storage tanks, for slurries, and in household appliances such as coffee machines. Basic level sensors can be used to identify the point at which a liquid fall below a minimum or rises above a maximum level. Many sensors can detail the specific amount of liquid in a container relative to the minimum/maximum levels, to provide a continuous measurement of volume