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Liquid Level Measurement

Questions and answers about liquid level measurement.

Level switch vs transmitter

What is the difference between a level switch and a level transmitter?

A switch will turn on or off at a predetermined liquid level, perhaps to protect a tank from overflowing or to maintain a minimum / maximum level in the tank.  The switch output is typically either a voltage free contact or if it is an electronic switch, a fixed voltage e.g. 12 volts when ON and 0 volts when OFF.

A transmitter has a variable output signal, 4 to 20 milliamps current loop is the most common. e.g. level transmitter for a 10 metre high tank, will read 4mA if the tanks is empty, 12mA if half full and 20mA if full.

Featured liquid level measurement products

  • 18.605 G Low Cost Submersible Diesel Fuel and Water Tank Level Sensor
  • LMK458 Marine Approved Hydrostatic Level Transmitter
  • LMK382 Low Range IP68 Waste Water Level Transmitter
  • External Mounted Tank Level Sensors

Related Help Guides

  • Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
  • Measuring the volume of liquid in a horizontal cylinder tank
  • Determining water tank volume using hydrostatic pressure
  • How do you measure the volume of a liquid using pressure
  • Calculating required pressure range for fuel tank level measurement
  • Measuring liquid level in a tank using a dp sensor

Related Technical Terms

  • Capacitive Fluid Level Measurement
  • cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
  • Conductive Fluid Level Detection
  • Float 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

Related Online Tools

  • Fluid Depth, Density, Gravity, and Pressure Calculator
  • Liquid Level Transmitter 4-20mA Current Output Calculator
  • Vertical Cylindrical Shaped Tank Contents Calculator
  • Horizontal Cylindrical Shaped Tank Contents Calculator
  • Rectangular Shaped Tank Contents Calculator
  • Pressure to Liquid Level Calculator
  • Liquid Level to Hydrostatic Pressure Calculator

Related Product and Application Guides

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

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