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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.

Liquid level measurement products
  • ATEX Approved Liquid Level Sensors for Hazardous Areas
  • Hydrostatic Level Sensors
  • External Mounted Tank Level Sensors
  • 18.605 G Low Cost Submersible Diesel Fuel and Water Tank Level Sensor

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Help Guides

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  • Supply voltage and load resistance considerations for pressure transmitters
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  • What is the difference between gauge and absolute pressure measurement
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  • How to Connect a 4-20mA Current Loop Pressure Transmitter
  • Advantages and Disadvantages of using a 4 to 20 mA Signal
  • Determining water tank volume using hydrostatic pressure
  • How do you measure the volume of a liquid using pressure
  • What is the difference between vacuum and absolute pressure
  • What does negative and positive gauge pressure mean

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