Float Ball Switch Liquid Water Level Sensor Floating ball switch is a kind of liquid level control device with simple structure and convenient use. It has the advantages of small volume and long working life compared with general mechanical switch. When selecting the right material, any kind of liquid, pressure and temperature can be used.Float switch is a equipment used to sense the liquid level in the tank.Float switches can be used in pumps, indicators, alarms or other devices. It can be easily converted from normally open to normally close by inverting the float. The float switch can be installed at the top or bottom of the tank, depending on whether you want to detect water rising or falling. Widely Applications: 1. For tank / pump water level control. 2. Used for water level control of swimming pool, fountain, pond, waterfall, etc . 3. Used for water level control of household appliances such as coffee maker/boiler/water dispenser . 4. For irrigation (automatic irrigation), hydroponic system. 5. For fish tank and aquarium system. Please Note : Float switch can not directly control solenoid valve or high power relay, AC contactor, etc. Small relays are required to transition.Floating ball switch can not directly control water pump, solenoid valve and alarm. When controlling solenoid valve and alarm, small relay should be added. When controlling the water pump, it is necessary to add small relay and AC contactor (select AC contactor to match according to the power of water pump)