Water Level Float Switch
Electric float switches for pump and tank level control: clean and wastewater models, rubber-cable, pear-type, and various cable lengths.
Products (12)
- Aplisens Angled Pear-Shaped Float Switch for Wastewater, 110 °C, 10 m – $52.38
- Element Liquid Level Float Switch, 0.60 m, Electric – $13.67
- Element Wastewater Level Float Switch, 3 m, 90° – $47.02
- EPC Liquid Level Float Switch, 1 m, Rubber Cable – $11.04
- Forza FRZ-ES Electric Float Switch – Liquid Level Float Switch, 2 m – $16.00
- Kentaş SK-12 Water Level Float Switch, 1.6 m Cable – Request a quote
- Nortek ARMUT 200 Pear-Type Float Switch, 2 m Cable – $30.00
- Nortek FLATOR 150 Water Level Float Switch, 1.5 m Cable – $14.40
- Water Level Switch – Cord Float Switch, Electric Float – $18.97
- Welko Liquid Level Float Switch, Rubber Cable, 1.6 m – $7.99
- Welko Wastewater Level Float Switch, 5 m, Pear-Shaped, 40° Operating Angle, Rubber Cable – $32.52
- Wersu Elevator Float Switch, Rubber Cable, 1.6 m – $30.48
Brands: Aplisens · Element · EPC · Forza · Kentaş · Nortek · Welko · Wersu
What is a level float switch?
An electric level float switch consists of a body that floats in the liquid and changes angle with the water level, plus a switch inside the body. When the water rises, the body tilts upward and the switch changes position; when the water level drops, it moves in the opposite direction. This simple mechanism allows pumps to be started and stopped automatically based on the water level.
Applications
- Draining (discharge): Starting the pump when water rises in drainage pits and septic tanks.
- Filling: Starting the pump when the tank level drops and stopping it when full.
- Dry-run protection: Stopping the pump when water in a well or tank runs low.
- Alarm: Giving a warning in the event of overflow or low-level conditions.
Whether the float switch will fill or drain is determined by the wiring configuration of the cables; check the wiring diagram in the product description.
Selection criteria
The cable length should be selected based on the depth at which the float switch will be suspended and the distance to the panel or pump connection. For wastewater and septic applications, models with cables rated for that environment and resistant to chemicals should be preferred. The operating angle of the float switch affects the difference between the switch-on and switch-off levels. If used in hot liquids, the temperature rating of the float switch should be verified. High-power pumps should be controlled through a contactor rather than directly through the float switch.
Installation tips
The float switch is suspended at the desired level with its cable secured by a weight or clamp; the free cable length between the weight and the float switch determines the operating range. There must be no obstacles such as pipes, cables, or walls in the float switch's range of movement. It must not be positioned where it could be drawn into the pump intake.
Frequently asked questions
How is filling performed with a float switch?
The cable connection is made according to the filling wiring diagram; when the water level drops, the contact closes and the pump starts.
Why does cable length matter?
It must be sufficient to reach the suspension depth and the connection point; making a splice risks compromising water tightness.
What is a pear-type float switch?
It is a model with a pear-shaped body that is widely used in wastewater pits and septic tanks.
Can a float switch start the pump directly?
It is possible for small single-phase pumps if the contact capacity is sufficient; larger pumps require a contactor.
Can it be used in an elevator pit?
Models specified for elevator pit applications may be used.
What is the difference from a mechanical tank float valve?
A tank float valve opens and closes the water supply mechanically; an electric float switch controls the pump.