Model WFS

Float switch

Selected documents
Sales contact



Applications for a float switch

  • Level measurement for almost all liquid media
  • Pump/level control and monitoring for defined filling levels
  • Chemical industry, petrochemical industry, natural gas, offshore, shipbuilding, machine building, power generating equipment, power stations
  • Process water and drinking water treatment, food and beverage industry

Special features of a float switch

  • Large range of applications due to the simple, proven functional principle
  • For harsh operating conditions, long service life
  • Operating limits: 
    - Operating temperature: T = -196 ... +350 °C
    - Operating pressure: P = Vacuum to 40 bar
    - Limit density: ρ ≥ 300 kg/m³
  • Wide variety of different electrical connections, process connections and materials
  • FM approved version / NEMA 4x or 7/9 housing
  • Process connection, guide tube and float from 316L/316Ti stainless steel or plastic
  • Universal signal processing: connection direct to a PLC is possible, NAMUR connection, signal amplification / contact protection relays
  • Works independently of foaming, conductivity, dielectricity, pressure, vacuum, temperature, steam, condensation, bubble formation, boiling effects and vibrations.

Description of a float switch

A float switch is comprised of a permanent magnet to ensure it moves along with the liquid level on a guide tube and provides accurate level readings. The guide tube is fitted with a reed contact (inert gas contact) and is energized by the approach of the float magnet. By using a magnet and reed contact, the operation of the float switch is non-contact, free from wear and needs no power supply. The contacts are potential-free. Magnetic float switches are also available with multiple switch points.

The switch functions always refer to a rising liquid level: SPDT or change-over contact.

Using a float for two switch points creates a bi-stable switch operation, meaning that the switching status remains available when the filling level continues to rise above or drop below the switch point.

float switch is simple to mount and maintenance-free, providing a cost-effective solution.

Float Switch -- model WFS

Float Switch -- model WFS

  • Float Switch -- model WFS
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