Liquid flow meters are used to measure the volumetric flow rate or amount of a moving liquid. Volumetric gas flow switches are devices with a switch output used for measuring the flow or quantity of a moving gas in terms of a unit of volume per unit time, such as cubic feet per minute. First, the existing theoretical fundamentals that cover flow measurement in regular conduits are presented and relevant design features of typical ultrasonic flow. result, accurate measurement of flow rate is very important. Needless to say that there could be diverse requirements of flow measurement, depending upon.


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Dividing the mass on the known volume of the tube gives us the density of the fluid.

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An instantaneous density measurement allows the calculation of flow in volume per time by dividing mass flow with density. Calibration[ edit ] Both mass flow and density measurements depend on the vibration of the tube. Calibration is affected by changes in the rigidity of the flow tubes.

Additional features that differential pressure transmitters for flow measurement flow measurement fundamentals possess include: This is necessary because flow rate is proportional to the square root of differential pressure for an orifice plate meter and other differential pressure flow meters.

  • Basics of Flow measurement Instrumentation Tools
  • Mass flow meter - Wikipedia

The location of the transmitter in a differential pressure flow measurement installation should be carefully considered in order not to introduce measurement errors.

As a flow measurement fundamentals, in gas flow measurement with the orifice flow meter, the transmitter should be installed above the pipe in order to prevent any condensate from entering the pressure lines.

Mass flow meter

For liquid measurement systems, the transmitter is installed below the pipe to prevent gas bubbles from entering the measuring system.

A pressure transmitter is flow measurement fundamentals to continuously measure static pressure in gas flow measurement setup. This is because static pressure variations significantly affect the density of gases and needs to be compensated for.

Liquid systems do not have this problem.


So a continuous measurement of the temperature of the process is required in order to compensate for this variation. However, in some fluids viscosity can begin to increase above certain temperatures. Viscosity is measured in units of centipoise. Another type of viscosity, called kinematic viscosity, is measured in units flow measurement fundamentals centistokes.

Applied fluid flow measurement : fundamentals and technology in SearchWorks catalog

Also, the fact that gases are compressible, whereas liquids essentially are not, often requires that different methods be used for measuring the flow rates of liquids, gases, or liquids with gases in them. It has been flow measurement fundamentals that the most important flow factors can be correlated together into a dimensionless parameter called the Reynolds Number.

Understanding Flow measurement fundamentals The Flow Law If liquid flow through a pipe of varying diameters, at any particular time the same volume flows at all points. This means, the velocity of liquid must increase at a narrow point see figure below.

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Energy Flow measurement fundamentals in Flow Back to the principle that energy is conserved within a system; it may just change from a state to another, the same principle applies to the flow within a flow closed-system. Consider the Below Diagram: Neglecting the types of energy which do not change during flow, the total energy is made up of; i.

There is no measurable change in potential energy. However, the static pressure changes, dependent upon the back flow measurement fundamentals, i.