Float switch is the basic form of a simple automation system.Its function is to operate or actuate a system by the level of liquid or fluid.Float switch can transmit only two types of signal -level zero, level highA circuit can be design to start stop some process by receiving the signals from float switch. Common processes are sending low or high level alarm, starting or stopping pump motor.
Construction and working of float switch:
Below images will clear the construction of float switch. It is designed to emptying a dirty water tank.
Dirty water level high- Level pump starts emptying, Dirty water level low-pump stops.