Liquid Float Switch Water Float Sensor

A liquid float switch (water level sensor) reliably senses liquid levels and acts as a water level controller — perfect for controlling pumps, alarms, and indicators in hydroponics, aquariums, ponds and many other fluid-control applications.

Key Uses & Applications

• Hydroponics — hydroponics float switch
• Saltwater & freshwater aquariums — aquarium float sensor for power head control and reef tanks
• Ponds & pond pumps — pond pump float switch
• Gardening & irrigation systems
• Basement alarms & condensate line protection
• Marine & automotive fluid control
• Ice machines, coffee pots, pressure washers, carpet cleaning machines
• General filtration, heating, evaporator coils, and relay control

Benefits

• Simple, reliable liquid level detection for both residential and commercial setups
• Convertible between Normally Open (NO) and Normally Closed (NC) by inverting the float
• Easy integration with pumps, relays, and control circuits for automated water management
• Compact, waterproof design suitable for harsh environments

Important Safety & Installation Note

The switch rating is low — it carries small switching current (max 0.5 A). Always use a relay or contactor when switching larger loads (motors, large pumps). Improper direct connection to heavy loads can damage the switch or create safety hazards.

Specifications

Table 1: Specifications of Water Float Sensor

Specification	Value
Cable Length	30.5 cm
Maximum Load	50 W
Max Switching Voltage	100 V DC
Minimum Voltage	250 V DC
Maximum Switching Current	0.5 A
Max Load Current	1.0 A
Max Contact Resistance	0.4 Ω
Operating Temperature	-20 °C to 80 °C

Recommended Installation Tips

• Mount the float vertically and allow free movement without obstruction.
• Use a relay or contactor suitable for your pump or motor current.
• Seal cable entry points to avoid water ingress and corrosion.
• Test the NO/NC function after inverting the float for correct operation.