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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
  • 140 inch range rangeable 4-20mA output wastewater level sensor and display for external fitting
  • 7mH2O hydrostatic level sensor with 4-20mA plus HART
  • Canola oil tank hygienic level sensor & indicator with high temperature protection
  • 7mH2O g range 4-20mA out hydrostatic liquid level pressure sensor

Request info on screw-in liquid level pressure transmitter products for your application.

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
  • Underground rain water storage tank level sensor and readout for 2 metre depth
  • 200m deep well pump water level sensor, switch & display
  • LMK307 Submersible Waste Water Level Sensor
  • Borewell water level sensor for 100m water height

Request info on waterproof liquid level pressure transmitter products for your application.

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Liquid Level Sensor Specifier

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Product Selection Guides

  • Differential Pressure Sensors
  • Digital Pressure Gauges
  • Digital Pressure Sensors
  • Digital Readouts
  • Hydrostatic Liquid Level Sensors
  • Millivolt Output Pressure Transducers
  • Pressure Transducers
  • Pressure Transmitters
  • Voltage Output Pressure Transducers

Application Selection Guides

  • Absolute Pressure
  • Dual Temperature and Pressure
  • Flush Diaphragm
  • High Frequency Response
  • Leak Testing
  • Low Pressure Range
  • Oxygen Service
  • Submersible
  • Vacuum

Help Guides

  • Using absolute pressure sensors to measure hydrostatic level
  • Measuring vacuum with negative gauge or absolute ranges
  • Measuring the difference in air pressure between rooms
  • What does negative and positive gauge pressure mean
  • Measuring the Pressure of Hot Media
  • Determining water tank volume using hydrostatic pressure
  • How to get a 10 volt signal from a 4-20mA output pressure sensor

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