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Mass flowmeters are devices that measure the amount fluid passed to a process. Mass flowmeters are used where the composition of materials used are important, which ensures the quality of the product. These are the different types of mass flowmeters: 1. Coriolis…
Impeller-Turbine Mass Flow Meters: The impeller, turbine type mass flow meter uses two rotating elements in the fluid stream, an impeller and a turbine. Both elements contain channels through which the fluid flows. The impeller is driven at a constant speed by…
Working principle of electromagnetic flowmeter: In the electromagnetic meter, the constant magnetic field is generated around the pipe by the magnet and the flowing liquid acts as a conductor. The fluid that flows can be considered as a continuous series of disks…
In the Rotameter, a weighted float or a plumb bob contained in a vertical conical tube is raised to the equilibrium position between the downward force of the plumb bob and the upward force of the fluid in addition to the floating…
Electromagnetic flowmeters Advantages: Unobstructed flow passage without projecting parts No moving parts No additional pressure drop Essentially flow profile insensitive, only short inlet and outlet sections required Unaffected by changes in temperature, density, viscosity, concentration and electrical conductivity Favorable choice of materials…
Doppler flow meters are based on the Doppler principle. The transmitter of a Doppler flow meter projects an ultrasonic beam at a frequency of about 0.5 MHz into the flowing current and diverts the reflected frequency. Principle of operation: An ultrasonic wave…
Orifice and venturi meter: Orifice and venturi meter works under the same principle, both meters creates a restriction in the flow channel and the pressure difference across the restriction is measured, which is proportional to the rate of discharge of flowing fluid…
Annubars are sometimes called average pilots and contain multiple pressure taps to “average” the flow; this is to try to compensate for a non-ideal flow profile. The averaged pitot tube is inserted through the pipe as shown below. One side of the…
Introduction The ability to measure flow rate is another important process measurement. There are four different classes of flow measurement transducers: differential pressure measurement, velocity-based measurement, positive displacement measurement, and mass flow measurement. Differential pressure measurement devices can be separated into restrictive…
Introduction The Doppler effect is a method to measure linear velocity. When a narrow laser beam (or radio beam or ultrasonic beam) is focused on an abject, the beam will be reflected back to the source. But if the object moves, the…
