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  • Float Switch with Counterweight.
  • Float Switch showing movement of Float relative to Counterweight to Turn Switch On and Off.
  • Float Switch set for either Filling or Emptying.
  • Minimatic Double Action Float Switch showing internal materials.

Float Switch with Counterweight (Fill or Empty)


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Product Description

Float Switch for Water Tanks or Cisterns

Our Float Switches are designed for simple, reliable control of a pump dependent on the water level in a tank, cistern or sump. This dual purpose Float Switch can be used for Tank filling (a high level cutout) or Tank Emptying (a low level cutout) - depending on how you wire the Switch up.

These Minimatic Float Switches are specifically designed to avoid the common problems that occur with other float switches. The unique patented design reduces the possibility of condensation developing inside the switch which can cause the electrical contacts to corrode. The outer shell is one piece blow moulded polyethylene and the inner casing is a blow moulded single piece filled with expanded Polyethylene to ensure a completely sealed, ultra reliable switch.

Available in various cable lengths; 2m, 3m, 5m, 10m, 15m, 20m, 25m.

Installation instructions are on the box.

How does a Float Switch Work?

A float switch switches an electrical circuit on or off when a high or low fluid level is reached. Single-acting float switches, like these, operate either when high or low (double acting float switches can do both, sending voltage to one output at high level and another at a low level). Float switches can switch mains voltage directly and are often used to control pumps and valves, or as level indicators for electronic control systems.

Operation of the switch is by a weighted mechanism inside the float, in this case a Stainless Steel Ball. The cable is fastened at a mid-level inside the tank causing the float to hang down at low level and float with the end pointing upwards at high level. As the level changes the float tilts and switching occurs at an angle of 30 degrees up or downwards (other brands may vary). The cable is either constrained by a fastener (cable tie to something else within the tank), or a the supplied Counterweight is attached to the cable.

Switching only occurs when the float points substantially up or down, not when floating horizontally, so unless pulling up or hanging down on the cable nothing will happen. This makes it easy to set the range of operation just by adjusting the length of free cable.

How to install a Float Switch in a Water Tank

Attach the Counterweight to the Electrical Cable (threading through the internal conical shaped end up and through the counterweight.

Secure the Counterweight in place with the Stopping Cone by clipping the Cone to the Cable and pushing it into the conical shaped end profile of the Counterweight. When purchased, the Stopping Cone is attached to the opposite end of the Counterweight and should easily come away when you push the cable through - if it hasn't remove it with a the help of a screwdriver or other tool. Alternatively the Cable can be secured to other (non-movable) items within the Water Tank.

The Float Switch must be free able to move freely within the area of the float arc.

Connect the float wires as required. This could be into the pump power cable (using a waterproof 3-way cable joiner), or suitable junction box.

It can also be connected to control other devices like solenoid valves.

Technical Information

  • Single outer casing piece in blow moulded Polyethylene.
  • Float switch is insensitive to humidity and condensation (patented design).
  • Chamber built as a single blow moulded piece for the switch and ball set.
  • Water resistant to 100m.
  • Inner single casing piece in blow moulded Polyethylene.
  • Stainless steel ball operating on a quality microswitch.
  • Non-hygroscopic closed cell injection of expanded polyurethane in the regulator to eliminate air and to hermetically seal the unit.
  • Max working pressure: 10 bar.
  • Neoprene cables H07RN-F.
  • IP68
  • 10 (4) A 250V~
  • Max Water temperature: 45°C
  • CE Mark
  • Size of Float: 172 x 80 x 56mm.
  • Cable lengths 2m, 3m, 5m, 10m, 15m, 20m, 25m.

Included Components

  • Float Switch
  • Electrical Cable
  • Counterweight
  • Cable Stopping Cone

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