A displacer level switch is a type of level switch that works by displacement. Displacer switches have a variety of variations, including a special kind of switch for use with containers that have surface wave action. This kind of switch is ideal for use in sumps, tanks, and containers where there is a smaller variation in liquid level. This design uses a spring to activate the switch rather than a float actuator. These switches are also idea for use with liquids that also contain solid particles.
Displacer level switches are vital for measuring the level of a liquid in a container. These switches use a system of springs and pressure to alert the operator to any changes in the liquid level. Usually, the switches are used to identify when a liquid is too high, but they can also be used to alert an operator to too low levels, such as in the case with a fuel gauge switch.