Float Switches

A float switch is a level sensor used to detect the level of liquid usually in a tank, container or well. The flotation part of the device sits on top of the liquid and will switch on the rise and fall of the liquid. Vertical 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 alarms.

How does a Float Switch Work?

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 switch action can be reversed by rotating the switch through 180°.

The switch and floating sensor sits on top of a water level and the changing fluid level will cause the reed change to work (for instance close or open) at a specific level. The internal mechanical switch opens or closes the electrical circuit with gravity which enables it to turn equipment on and off such as a water pump.

What Materials are Float Switches Made Of?

Float switches are made from a variety of materials, each suited to different environments and applications. The choice of material depends on how and where the float level switch will be used.

• 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 120ºC.
• Stainless steel: medical and food industries, hydraulic fluids, chemicals.

Features and Benefits

• Highly Flexible: Float sensors are highly flexible, allowing for installation in various orientations and tank configurations. This flexibility makes them suitable for a wide range of applications.
• High Mechanical Load Rating: With a high mechanical load rating, water level float switches can withstand significant pressure and force, ensuring reliable operation in demanding environments.
• Insensitive to Turbulence: Level switches are designed to be insensitive to turbulence, providing accurate and consistent level measurement even in agitated or turbulent liquids.
• Shock and Rupture Proof: Built to be shock and rupture proof, floating sensors are durable and reliable, offering long-term performance even in harsh and demanding conditions.
• WRAS approvals: Float switches with WRAS approvals meet rigorous standards for use with potable water, ensuring safety and compliance in water supply tank applications.

Applications of Float Switches

Float switches can be used in several situations, some of which include:

• Sump Pits: Float level switches are used to detect water levels in sump pits, automatically activating pumps to prevent flooding and water damage in basements and low-lying areas.
• Fuel Tanks: Float sensors monitor fuel levels in tanks, ensuring accurate measurement and preventing overfilling or running dry, which is crucial for the efficient operation of generators and vehicles.
• Coolant Tanks: In industrial machinery, float switches for water tanks are used to monitor coolant levels, ensuring proper cooling and preventing overheating of equipment.
• Oil/Water Separators: Float level controllers in oil/water separators help maintain the correct separation levels, ensuring efficient operation and compliance with environmental regulations.
• **Wastewater and Sewage Treatment: **Water level float switches are essential in wastewater and sewage treatment plants for monitoring and controlling liquid levels, preventing overflow and ensuring smooth processing of waste materials.

How to Order Float Switches from RS

RS is a trusted supplier of float switches, offering a wide range of products from renowned brands such as RS PRO, Sensata / Cynergy3, WIKA, and Gems Sensors. Our extensive catalogue provides a variety of options to meet your specific needs.

To place an order, simply browse the RS website and use the filter options to narrow down your choices based on your requirements. You can filter by device type, including float level switches, float switches, and sensors, as well as for use with specific liquid types such as water, oil, or chemicals. Additionally, you can select based on mounting type, cable length, and switch material to find the perfect solution for your application.

Once you’ve found your desired float switch, add it to your cart and proceed to checkout. RS ensures a smooth and efficient ordering experience, providing high-quality float switches for all your liquid level monitoring needs.

How Delivery Works at RS Hong Kong

We offer convenient delivery options to ensure you receive your order promptly.

Note: Delivery is not available to GPO Box, Restricted Area, and Outlying Islands. For global stock and Product Plus products, please contact customer service.

For more information, please visit our delivery page.