The Basics Of A Pressure Manometer

There have been many design changes and evolutions in technology in the devices used for measuring pressure. While they have become significantly more precise and accurate and include the latest in technology and computer software compatibility, in its basic operation the pressure manometer hasn’t changed a great deal in actual basic operation.

History In Brief

The earliest form of the pressure manometer was just as simple U-tube. While rudimentary it still provided accurate measurement in the change of the level of the liquid on the legs when pressure was applied.

There are still basic U-tube manometers in use. They are more sophisticated and tend to have different scales n the legs to measure the pressure difference, actually the liquid height differences, during the test. The benefits of this type of system include:

  • Consistent measurement as it is based on gravity
  • No need to calibrate between measurements
  • Can be used in any type of environment provided it is at a temperature to allow free movement of the liquid through the leg and U-shape.
  • Consistent liquid density allows for measurements over time that will be consistent and accurate.

This simple type of pressure manometer is often a must in the field, but it can also be used in laboratory testing as well.

Adding Technology

When high degrees of accuracy are required or when there are multiple measurements needed, technology provides a simple option. Portable or permanently mounted manometers are often used in labs and testing facilities when tests may be required on an ongoing basis.

These systems allow parameters to be set and data set directly to the recording or tracking software.

The various models can offer internal memory storage, the ability to average multiple measurements and even to complete readings in very high pressure types of applications where standard manometers would not be effective.

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