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Using a screw-in or waterproof pressure transmitter to measure liquid level

The first step in selecting a pressure transmitter for liquid level measurement is to determine whether to submerge or mount the sensor externally.

Mounting a liquid level pressure transmitter externally is nearly always preferable because a screw in pressure transmitter is normally cheaper than one that is immersed and is easier to service.

If you are mounting a liquid level pressure transmitter externally, care should be taken not to install it onto pipes where there is likely to be a high flow of liquid or pump pressures since these may interfere with the hydrostatic pressure reading.

Screw-in liquid level pressure transmitter products
  • 1 metre screw-in plastic level sensor for biodiesel/sulphuric acid mixture with 4 to 20 mA output
  • Dairy silo level sensor & display unit for reading content in litres
  • Screw-in 2m height onboard marine vessel diesel tank base mount level sensor
  • HART flameproof (Ex d) re-scalable level transmitter for hydrostatic head up to 2 metres

Waterproof pressure transmitters are used when it is not possible to provide access from the outside at the point you would like to measure the liquid level. For example there is no way to fit a pressure transmitter to the outside of a buried water storage tank without excavating the ground around it, so a waterproof pressure transmitter is the most economical solution.

Normally a manufacturer will clearly describe in the specification whether a pressure transmitter has an immersion option. In Europe there is a system for rating the level of water tightness which is the Ingress Protection Rating or more commonly known as the IP Rating. For immersion the pressure transmitter should be sealed to a rating of IP68. If it is not clearly marked in the literature you should clarify with the manufacturer for what depth and duration it can be submerged.

Waterproof liquid level pressure transmitter products
  • LMK387 Cleanable Sewage and Sludge Pressure/Level Sensor
  • LMK 487 Submersible Ballast Tank and Draught Level Pressure Transmitter
  • LMP305 Borehole Level Transmitter
  • 18.605 G Low Cost Submersible Diesel Fuel and Water Tank Level Sensor

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Liquid Level Sensor Specifier

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Help Guides

  • Measuring negative pressure using a positive differential pressure range
  • Pressure Sensor Accuracy Specifications
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  • Measurement Accuracy
  • Supply voltage and load resistance considerations for pressure transmitters
  • Measuring vacuum with negative gauge or absolute ranges
  • What is the difference between gauge and absolute pressure measurement
  • Measuring the difference in air pressure between rooms
  • 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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