Applications of the float switchLevel measurement for almost all liquid mediaPump and level control and monitoring for distinct filling levelsChemical, petrochemical, natural gas, offshore, shipbuilding, machine building, power generating equipment, power plantsProcess water and drinking water treatment, food and beverage industrySpecial features of the float switchLarge range of application due to the simple, proven functional principleFor harsh operating conditions, long service lifeOperating limits: – Operating temperature: T = -196 … 350 °C – Operating pressure: P = Vacuum up to 40 bar – Limit density: ρ ≥300 kg/m3Wide variety of different electrical connections, process connections and materialsExplosion-protected versionsDescription of the float switchA float with a permanent magnet moves reliably along with the liquid level on a guide tube. Within the guide tube is fitted a reed contact (inert gas contact), which is energised, through the non-magnetic walls of the float and guide tube, by the approach of the float magnet. By using a magnet and reed contact the switching operation is non-contact, free from wear and needs no power supply. The contacts are potentialfree. Float switches are also available with multiple switch points.The switching functions always refer to a rising liquid level: Normally open, normally closed or change-over contact.Through the use of a float for a max. of 2 switch points a bistable switch behaviour can be achieved, meaning that the switching status also remains available, when the filling level continues to rise above or drop below the switch point.The float switch is simple to mount and maintenance-free, so the costs of mounting, commissioning and operation are low.
