Schwimmerschalter Reed

Float Switches for Level Detection

Reliably monitor and control liquid levels using Reed float switches.

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

Schwimmerschalter Schnittbild Aufbau

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

Float Switches for 230V

Suitable for industrial plants to monitor liquid levels and activate pumps when needed.

Float Switches for 24V & 12V

Ideal for applications such as PLC controls or vehicles where direct current is used.

ATEX-Certified Float Switches

Safe for use in hazardous areas in accordance with strict international standards.

Side-Mounted Float Switches

With an angled float for flexible installation in narrow or unusually shaped containers.

Submersible Float Switches

With an angled float for flexible installation in narrow or unusually shaped containers.

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
Mitarbeiter Produktion
What Makes Reed Electronics’ Float Switches Stand Out?

At Reed Electronics, our float switches are renowned for their precision, reliability, and versatility. Here are some of the standout features that define our float switches:

1. High Precision and Reliability

Our float switches provide accurate measurement and switching, even in challenging environments. Thanks to cutting-edge technology and meticulous manufacturing, we ensure reliable and precise level detection.

2. Durability and Robustness

Our float switches are designed to withstand the harshest conditions. They are made from high-quality materials that ensure long life and resistance to corrosion, high temperatures, and chemical influences.

3. Custom Solutions

We offer tailored solutions that are precisely aligned with the specific requirements of our customers. Our experts work closely with you to ensure the float switch is perfectly integrated into your application. We manage everything in-house and manufacture the sensors at our facility in Lucerne, Switzerland.

4. Ease of Installation and Maintenance

Reed Electronics’ float switches are designed for easy installation and maintenance-free operation. This saves time and costs during commissioning and ongoing operation.

5. High-Quality Customer Service

Our extensive experience and dedicated team guarantee top-notch customer support. From consultation and selection of the right float switch to post-purchase assistance, we are always at your service.

Through our extensive experience in handling various aggressive media, we can perfectly support you in selecting the right material and the correct application, ensuring you have no downtime.

Discover the advantages of our float switches and be convinced by their quality and performance. At Reed Electronics, your satisfaction is our top priority.

75A1671-Bearbeitet_zugeschnitten_web
Peter Schmid
Sales Specialist

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

Individual

Design and production in line with your requirements and with no minimum order quantities. Also available in an EX design for use in potentially explosive atmospheres.

Compact design

The smallest design possible features one single switchpoint and is suitable for use in small containers and confined spaces.

Tried-and-tested solution

Our float switches are based on the tried-and-tested Reed contact-magnet principle.

Durable and reliable

The robust design guarantees the durable and reliable operation of our products.

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.

Get in touch now!

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.

Sauglanze_Kanister_Reed_Absaugung

Suction Lance with integrated Fill-Level Monitoring

Durable and robust suction lances from Reed Electronics AG are equipped with a float switch and allow for the accurate extraction and filling of fluids in a container.

How can we help you?

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