Your contact person will be pleased to advise you on the selection of the appropriate product solution. The available products can be found on the WIKA website. Sump and sewage float switches have a float that raises and lowers depending on the water level in the sump basin to automatically control switch operation. PVC cable outlet)Īs a leading provider of float-based measurement technology solutions, WIKA has a wide range of variants to meet all your application-specific requirements. Position and function of each switching output.Low liquid level switch for cooling water expansion tanks. Number of switch contacts / switching outputs Pneumatic Float Switch Model 106 Pneumatic dump valve controller for low pressure scrubbers.The following parameters should be defined: The adjusting collars fitted by the manufacturer serve as a limitation for the float body in the correct position, to ensure / maintain the desired switching signal on reaching the defined filling level. Float Level Switch Construction EMCO liquid level switches have been manufactured since 1973 serving customers reliably in many different industries. Since the contact leaves are under a mechanical preload, a magnetic field must be applied in order that the contact leaves close or open in order to generate the desired switching signal (monostability). If one selects a change-over contact, the glass capsule will contain three contact leaves, with which, at all times, a normally closed and a normally open contact are simultaneously made in every operating state. WOMAN LOOKING AT CONTROL SWITCHES ON CANAL BARGE NARROWBOAT RE BILGE PUMP STARTER SWITCH IGNITION CONTROL. In the case of a float switch with normally closed switching function, the contact or circuit is interrupted on applying a magnetic field. Aqua float switch sensor for water level controller. When the contact between the leaves is made, a current can flow via the closed leaves and a switching signal will be detected. In the case of a float switch with a reed contact with a normally open function, on applying a magnetic field, the leaves are brought into contact.
Reed contacts (see figure) of a float switch feature contact leaves within the hermetically sealed glass body, which move together or apart from each other when a magnetic field is applied. It is also suitable for use in sewage and. In its simplest form, a float switch consists of a hollow float body with a built-in magnet, a guide tube to guide the float, adjusting collars to limit the travel of the float on the tube and a reed contact located on its inside (see figure).įigure: Selection of reed contacts of a float switch How does the float switch function? The KS float switch, used in liquids for control or signal activation, operates in response to the liquid level. Modern float switches, of course, are used for switching an electric circuit and feature a clearly more sophisticated design. as a simple flap control for an irrigation channel, one has implemented a mechanical float switch.
It floats on top of the liquid surface and acts as a mechanical switch as the liquid. If one uses this movement via a mechanical lever, e.g. A float switch detects the level of a liquid in a tank or container. A hollow body (float), due to its low density and buoyancy, lifts or drops with the rising and, respectively, falling level of the liquid. But how does a float switch actually work?įloat switches, in a simple mechanical form, have already been in use for the control of water flows in mills and fields for centuries and today still represent the most frequently used technology. It is not a coincidence that, today, float switches still represent the most frequently used principle for level monitoring.
The float switch is simple to mount and maintenance-free, so the costs of mounting, commissioning and operation are low.Float switches are simple, universally applicable and exceptionally reliable. 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 switching functions always refer to a rising liquid level: Normally open, normally closed or change-over contact. The contacts are potentialfree. Float switches are also available with multiple switch points.
Float switch free#
By using a magnet and reed contact the switching operation is non-contact, free from wear and needs no power supply. 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. In the WIKA FLS magnetic float switch a float with a permanent magnet moves reliably along with the liquid level on a guide tube.
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