1. Product Description

The Square 3M Cable Float Switch for Industrial Pump and Tank Level Control is an automatic liquid-level control device designed to regulate pumps, motors, and compatible electrically operated valves according to the liquid level in a tank, sump, or well. It can also be used as a level-triggered alarm switch to indicate when a predetermined liquid level is reached.

Featuring a 3-metre cable, IP68 protection rating, and a sealed double-chamber float construction, this float switch is designed for use in suitable liquid-level control applications, including water tanks, sewage systems, and industrial pumping installations. Its buoyant float moves with the liquid surface, changing the internal switch state as the liquid level rises or falls.

The switch can be integrated into a suitable control circuit to automate pump starting and stopping, helping reduce the need for manual operation. The supplied specifications list a working pressure of 0.1 MPa, an operating temperature range of 0°C to 75°C, and an electrical rating of 10(8A) at 250V AC or 10(4A) at 380V AC.

This product is intended for non-flammable liquids and is explicitly specified as not explosion-proof. Applications involving potentially explosive atmospheres require an appropriately designed and certified protection system; this float switch must not be used alone in such environments.

2. Features

• Automatic liquid-level detection and switching

• Suitable for pump and tank level control

• Can control compatible pumps, motors, and solenoid valves through an appropriate circuit

• Can be used for liquid-level alarms

• 3-metre cable for installation flexibility

• IP68 protection rating, as specified

• Double-chamber float construction

• Hermetically sealed construction, as described by the supplier

• Suitable for compatible water and sewage applications

• Specified compatibility with certain oils, acids, and alkalis; chemical compatibility must be verified

• Operating temperature range of 0°C to 75°C

• Working pressure of 0.1 MPa

• Designed for repeated mechanical switching

• Not explosion-proof

3. Specifications

Note: The source specification lists 78 × 103.5 mm as the material entry, but these values appear to describe the rectangular housing dimensions. The exact switching current and permissible load depend on the manufacturer’s rating and load type.

4. Working Principle

The float switch operates through the buoyancy of its float casing. As the liquid level rises or falls, the float changes position, causing the internal switching mechanism to change electrical state.

A typical installation uses this switching action to control a pump through a suitable control circuit:

• Low liquid level: The switch can be configured to start a pump when the level drops, such as in a tank that needs to be refilled.

• High liquid level: The switch can be configured to stop a filling pump when the liquid reaches the upper level.

• Alarm operation: The switch can trigger an alarm or signal when a predetermined liquid level is reached.

The exact ON/OFF action depends on the switch’s internal contact configuration, wiring, and installation orientation. Confirm the required switching behaviour before connecting the pump.

5. Design and Construction

The switch features a square float casing with a double-chamber construction and a sealed finish, as described in the supplied product information. Its buoyant design allows it to follow changes in the liquid surface and operate the internal switching mechanism.

The 3-metre cable provides flexibility when installing the switch in tanks, wells, sumps, and compatible industrial liquid containers. Its specified IP68 protection rating makes it suitable for appropriately installed applications involving immersion, subject to the manufacturer’s conditions for depth, duration, cable entry, and installation.

6. Installation and Operation

1. Select a suitable mounting point that allows the float to move freely with the liquid level.

2. Position the cable and float so that the intended upper and lower switching levels can be reached.

3. Connect the switch to a compatible control circuit according to the manufacturer’s wiring diagram.

4. Test the switching action before operating the pump or other equipment.

5. Ensure the cable, connections, and electrical enclosure are suitable for the environment.

For high-current pumps and motors, use an appropriately rated contactor or relay rather than relying on the float switch to directly carry a load beyond its specified rating.

7. Applications

The Square 3M Cable Float Switch is suitable for:

• Water tank level control

• Automatic tank filling

• Sump pump control

• Drainage and wastewater systems

• Sewage water level detection

• Industrial pump automation

• Reservoir and storage tank monitoring

• Liquid-level alarms

• Compatible industrial liquid containers

• Automatic water supply systems

• Pump protection and level monitoring

Chemical applications should only be considered after confirming that the float casing, cable, seal, and internal components are compatible with the particular liquid.

8. Package Includes

– 1 × Square 3M Float Switch for Industrial Pump Tank Sensor

9. Product Disclaimer

• This float switch is specified for non-flammable liquids and is not explosion-proof.

• Do not install it alone in potentially explosive atmospheres, such as certain fuel or oil tank environments.

• The IP68 rating does not establish suitability for every immersion depth, duration, chemical, or installation method.

• Check the manufacturer’s wiring diagram, contact arrangement, and electrical ratings before installation.

• The stated AC ratings must not be assumed to apply equally to DC loads or every type of motor.

• Use a suitable contactor or relay for loads exceeding the switch’s direct switching capacity.

• Verify chemical compatibility before using the switch with oils, acids, alkalis, or other liquids.

• Mains-voltage wiring should be performed by a qualified person with suitable electrical protection.

Note: The product images are for illustration and representation purposes only. The actual product may slightly differ in appearance, colour, design, or component placement from the images shown due to manufacturing variations and production batches.