Typically used in pairs to enable 2 functions (emptying and filling). These features make it suitable for turbulent water and industrial wastewater. The JPM series type is a tilt level switch that consists of a heavy body, is free of irregularity, doesn’t require an external counterweight, and rotates around itself when submerged. Therefore, it is important to properly wire and to set the preset liquid level specifically for your application. The open-circuit then signals to a pump to turn on and pump water into the tank.įigure 2 on the right shows a similar application, but it detects a "low" point in the water tank and works in reverse. When the water level decreases, the float switch goes down and in turn moves the magnet away from the reed switch and opens the electrical circuit. This closed electrical circuit then signals to a pump to stop pumping water into the tank. The floating body will rise with the water, which causes the magnet to move towards the reed switch and the switch closes. Figure 2 on the left shows a common application of stopping the inflow of water at a "high" point in a water tank. This preset level is the position that the internal mechanical switch goes between open and closed. The vertical float switch installation either has a "fixed point" or an external counterweight. The liquid level controls the float switchs angle, which directly controls the magnets position inside of it. The switch has a maximum switching current and voltage, so ensure you do not exceed this specification. Therefore, if the magnet moves away the reed switch will create an open circuit (no electric current can flow). Switching methodįor a reed switch, if the magnet is close to the reed switch it creates a closed circuit (electric current can flow). Therefore, the mechanical switch creates an open or closed electrical circuit. There are other types of internal switches, but the working principle that they open/close due to gravity and water level moving the float switch vertically up or down is the same. The most common internal switch is a reed switch, so there is also a magnet inside the body. Typically, this connected device either stops or starts the inflow of the liquid.Ī float switch consists of a hollow floating body and an internal switch, also called a sensor. Depending on the counterweight and pre-set trigger, the mechanical switch opens or closes allowing an electrical current through it to the connected device. As the liquid level goes up or down, it moves vertically with the liquid level. Features and BenefitsThe highly flexible thermoplastic rubber cable has an extremely high mechanical load rating.The drop shape of the stabilizing weight eccentrically mounted in the housing makes the float switch insensitive to turbulence.The microswitch, fitted in a dual-chamber system, is completely shock- and rupture-proofAvailable with WRAS approvals.In short, a float switch is a mechanical switch that floats on top of a liquid surface. What are material types of a float switch?Nylon – used for oils, diesel, organic chemicals.Polypropylene (PP) – acids and alkali, detergents, oils, water, organic chemicals.Polyphenylene sulphide (PPS) – used for more aggressive chemicals, and higher temperatures, up to 120✬.Stainless steel – medical and food industries, hydraulic fluids, chemicals. This trusted and tried technology depends on a generally straightforward plan that offers long-haul quality without the requirement for the user to calibrate a switch. The movement of the float, due to changing fluid level, will cause the reed change to work (for instance close or open) at a specific level. The switch action can be reversed rotating the switch through 180°. Float switches are used for automatic level control of groundwater, wastewater and sewage pumps, for raw water and liquid transfer pumps at waterworks, and for high water alarm.RS Components offer a wide range of high-quality horizontal and vertical devices from leading brands including Cynerg圓, Pepperl + Fuchs, Gems Sensors, Telemecanique and of course RS PRO What does a float switch consist of?Float switches have a reed switch and a pivoted magnet and can be used for normally open (N/O) or normally closed (N/C) operation. The flotation part of the device sits on top of the liquid and will switch on the rise and fall of the liquid. A float switch is a level sensor used to detect the level of liquid usually in a tank, container or well.
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