Float Switches for Level Detection
Functions of float switches: What is a float switch?
With a float switch, also known as a level switch, specific limit levels of liquids can be reliably monitored and controlled. The sensors are based on proven reed technology and are characterized by their durability. With over 30 years of experience in development and manufacturing, we provide field-tested products for a wide range of applications.
Float switches are typically used for overfill and empty detection, as well as for alarm signaling and pump control, and are suitable for use in liquid media. For applications in explosive atmospheres, float switches are also available in EX versions (ATEX).
Product overview
How does a float switch work?
Our float switches are based on the tried-and-tested Reed contact-magnet principle, which guarantees reliable and long-lasting functionality. The only moveable component within the sensor is the float itself, which rises and falls together with the level of the medium. If the fluid reaches a defined limit level, the magnet within the float activates the Reed contact inside the sliding tube. The contact switching tongue closes and allows the current to flow.
Modular design for maximum flexibility
Thanks to their modular construction, our float switches can be precisely adapted to specific applications. Length, number of switching points (up to six), float dimensions, and connection types can be selected individually. The sensors are available in various materials such as PVC, PP, PVDF, stainless steel, or Buna, covering a wide range of applications – even in aggressive media or explosive environments. Installation is possible from the inside, outside, or in reverse direction, ensuring optimal integration even in confined spaces.
Variants and technical specifications
Our float switches are available in various designs and technical configurations. They can be flexibly adapted to different application requirements – in terms of size, material, and connection type, as well as electrical and mechanical parameters:
Standard and mini float switches
Our float switches are available in two basic versions: as individually configurable standard models and as compact mini float switches. The latter is particularly suitable for applications with severely limited installation space and is available as a standard version directly from stock. While standard models offer up to six switching points, the mini switch is designed for a single switching point. Both variants are mechanically robust, resistant to chemicals, and – depending on the version – designed for temperatures up to 200°C.
Mechanical and electrical features: Float switches with 25V, 50V, 230V
For mechanical connection, numerous thread options are available, including G1/8″, G1/4″, G3/8″, G1/2″, flange or adjustable fittings. Float diameters from 16 to 52 mm and tube diameters between 8 and 16 mm enable precise adaptation to the respective application. Our float switches are based on a flexible modular system: using a comprehensive range of standardized components, we manufacture individual configurations – quickly and efficiently. If the desired connection is not part of the standard range, we also realize fully customized versions – including special threads, colored nuts, or different installation lengths.
Electrically, our float switches support a maximum switching capacity of 10 W at voltages up to 50 V/DC or 25 V/AC – optionally also available in 230 V/AC versions. Connection types such as cables, plug connections, or terminal boxes can also be freely selected or implemented according to customer specifications.
Materials, temperature, and pressure ranges: Stainless steel float switches & more
Depending on the medium, the choice of materials includes PVC, PP, PVDF, stainless steel, or Buna. For connection cables, PVC, PUR, silicone, Teflon, or FEP can be used depending on the environment. The sensors are designed for temperatures from –20°C up to 200°C, depending on the float material. They operate reliably with media densities starting from 0.7 g/cm³ and are optionally available with EX certification and food-grade surface treatment. The protection class reaches up to IP68.
Versions of our float switches
Application areas of float switches
Float switches are used wherever the liquid level needs to be detected, monitored, or controlled – whether in large industrial plants or compact household appliances. Their versatile design, high media resistance, and the possibility of customer-specific customization make them a reliable solution in a wide range of industries.
Industry and mechanical engineering
In industrial processes, float switches ensure smooth plant operation. They monitor and control liquid levels in:
- Cooling and lubrication circuits
- Hydraulic tanks
- Chemical reactors and process containers
- Pump systems for dry-run protection or overflow prevention
Thanks to their robust design, they operate reliably even in environments with high temperatures, aggressive media, or vibrations.
Household and consumer devices
Float switches also ensure safety and efficiency in consumer goods:
- Washing machines and dishwashers for water level control
- Dehumidifiers and air conditioning systems
- Water tanks in coffee machines or soda makers
Their compact dimensions and maintenance-free operation enable discreet, long-lasting integration.
Food and chemical industry
In sensitive production environments, special versions offer additional safety and hygiene:
- Food-grade versions with electropolished surfaces
- Use in CIP and SIP cleaning processes
- Certified EX versions for explosive areas such as:
- Tank farms
- Chemical filling plants
- Biotechnological reactors
We would be happy to help you find the right product for your applications. Contact us for a non-binding consultation.
Advantages of Reed float switches
Custom configuration and options
Our float switches are manufactured precisely according to customer specifications. Whether for standard applications or special system integrations – thanks to their modular design, mechanical, electrical, and functional parameters can be exactly adapted to individual requirements.
Customization to customer requirements
- Custom sensor lengths available from a single unit
- Various float diameters from 16 to 52 mm
- Multiple connection threads such as G1/8″, G1/4″, flange solutions, or adjustable fittings
- Selectable switching functions: normally open, normally closed, or changeover contact
- Customer-specific connection options: cable types, plug connectors, terminal boxes
By precisely matching the target system, an economical solution with high operational safety is created.
FAQs – Frequently asked questions about Reed float switches
How many switching points are possible with a float switch?
Our float switches can be equipped with up to six individually positioned switching points.
Is a float switch suitable for aggressive or explosive media?
Yes, we offer versions made of chemical-resistant materials such as PVDF or stainless steel, as well as ATEX-certified variants for hazardous areas.
Can the float switch withstand temperatures above 100°C?
Depending on the material selection and design, temperature ranges up to 200°C are possible.
What connection options are available?
Threaded connections such as G1/8″, G1/4″, or flanges are available, as well as electrical connections via cables, plug connectors, or terminal boxes – all can be customized to meet specific needs.
