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Float switch

Float switches, also known as level or liquid sensors, provide precise monitoring of liquid levels in tanks, containers, and systems. In the world of industrial automation, they have become a proven technology. Whether it's preventing overfilling, triggering alerts for low liquid levels, or controlling pumps, our float switches offer a reliable solution.

Operating Principle

The operating principle of a float switch based on a reed contact relies on the use of a reed contact as a switching element. A float switch consists of a buoyant body, also known as a float, which floats on the liquid level. The buoyant body is equipped with a magnet.

As the liquid level changes, the buoyant body moves up or down accordingly. When it reaches a certain level, the magnet approaches the reed contact. The reed contact consists of two ferromagnetic contact blades placed inside a glass bulb. These blades are separated by a small air gap.

When the magnet of the buoyant body reaches the reed contact, the magnetic field attracts the ferromagnetic blades and brings them together. This action closes the contact blades, completing an electrical circuit. This closed circuit can be used to send a signal, such as triggering an alarm or controlling a motor.


  • Precision: Float switches offer precise detection of liquid levels for precise control and regulation.
  • Reliability: Their robust construction and high-quality materials ensure long-term and reliable operation, even in demanding environments.
  • Easy Installation: Float switches are easy to install and can be seamlessly integrated into existing systems.
  • Low Maintenance: Thanks to their rugged construction, float switches require minimal maintenance, saving time and costs.
  • Flexibility: There is a wide variety of models and designs to meet individual requirements and operating conditions.
  • No Power Supply Required: Float switches are passive devices and therefore do not require a power supply.
  • Low Interference: They are not affected by factors such as foam, conductivity, dielectric, pressure, vacuum, temperature, etc.
  • Media Compatibility: Float switches are suitable for nearly all types of media, such as oil, water, chemicals.


Industrial Automation
In industrial automation, float switches play a crucial role in liquid monitoring. Whether in cooling and air conditioning systems, hydraulic systems, heating systems, or the food and beverage industry, our float switches enable precise control and regulation of liquids to ensure smooth operation and prevent potential damage.

Pump Control
Another significant application of float switches is in pump control. Our float switches monitor the liquid level and automatically control the pumps on and off. This ensures efficient pump operation and prevents potential damage.

Oil Level Monitoring and Control
In the machinery and automotive industries, monitoring oil levels is crucial for the smooth operation of engines and transmissions. Our float switches provide precise oil level detection and can be used to trigger alerts for low oil levels or automatically control oil refills. This ensures reliable lubrication and prevents potential damage to machinery.


Float switches find applications in numerous industries. In the food industry, they are used, for example, to monitor liquid levels in storage tanks and filling systems. In the chemical and petrochemical industries, they play a vital role in the safe handling of chemicals and preventing overfills. They are also used in water treatment, mechanical engineering, the automotive industry, and many other fields where precise liquid monitoring is required.


Engler Steuer- und Messtechnik GmbH & Co. KG
Lange Straße 151
D-72535 Heroldstatt

Telefon +49 7389 / 9092-0
Fax +49 7389 / 9092-40

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Industry sectors

  • Hydraulic units
  • Chemical industry
  • Dosing filling equipment
  • Electroplating
  • Food industry
  • Machinery and equipment construction
  • Medical
  • Overview industries

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