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Float Fluid Level Detection

Float Fluid Level DetectionFloat activated switches for opening or closing electrical contacts at a preset fluid level.

Float fluid level switches are threshold contact trip devices which typically consist of a buoyancy component which is typically a sealed hollow ball or cylinder which will float on a fluid, and either a shaft assembly for vertical mounting, or a hinge mechanism for horizontal mounting.

As the level increases and decreases a float will be pushed up or drop down. The float can be connected to a hinge that opens and closes or slides along a shaft.

The position of the float along the shaft or the opening and closing of the hinge can be detected by various means.

A vertical mount sliding float type level switch will have a permanent magnet incorporated into the float which slides up and down the shaft. A magnetic reed switch is positioned along the shaft to the required level set point. When the float pashes over the reed switch it will open or close the level switch circuit.

A horizontal mount hinged type float level switch will incorporate either a microswitch or a magnetic reed switch, which is activated by an actuator or lever connected to the float.

It is possible to fit more than one switch to shaft type float switch, and provide fluid level control for a number of separate processes which are activated at different levels.

Featured liquid level measurement products

  • LMK382 Low Range IP68 Waste Water Level Transmitter - Submersible Low Range waste water level transmitter with intrinsically safe option for monitoring the level of sewage and effluent in water treatment plants.
  • River level sensor for run-of-the-river hydropower monitoring up to 4m - Vented pressure river level sensor for measuring water level up to 0.4 bar in run-of-the-river hydroelectricity systems.

Glossary of Liquid Level technical terms

  • Capacitive Fluid Level Measurement
  • cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
  • Conductive Fluid Level Detection
  • ftH2O – Feet of Water Column at 4 deg C Pressure Unit
  • Hydrostatic Pressure
  • mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
  • mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
  • Specific Gravity
  • Vibrating Tuning Fork Fluid Level Detection

Help from Liquid Level resources

  • Difference between vented and non-vented water level measurement
  • Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
  • Determining water tank volume using hydrostatic pressure
  • Measuring the volume of liquid in a horizontal cylinder tank
  • How do you measure the volume of a liquid using pressure
  • Measuring liquid level in a tank using a dp sensor

Guidance with Liquid Level requirements

  • Hydrostatic Pressure
  • Hydrostatic Liquid Level Sensors
  • Liquid Level Sensors

Tools for Liquid Level calculations

  • Fluid Depth, Density, Gravity, and Pressure Calculator

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