Each of these Water Rotameter types has unique operating princi

Update:02 Jun 2021

  Water Rotameter is an instrument that can measure the amount of water passing through a pipe. Depending on the water measurement application, budget terms, and maintenance requirements, several water flow meter technologies can be selected. Each of these Water Rotameter types has unique operating principles, the total cost of ownership, and specific application benefits.

  The question is which Water Rotameter should the user choose for water flow measurement applications? There are four main types of Water Rotameter: mechanical water flow meters, ultrasonic flowmeters, vortex volume flow meters, or electromagnetic flowmeters.

  Four types of water flow meters

  Mechanical flowmeter

  They are the most common and most economical water flow meters that measure flow through the rotation of the turbine through a split, propeller, or paddle wheel design. The mechanical water flow meter works by measuring the speed of the pipe that causes the piston or turbine to rotate. The volume flow of water is proportional to the speed of the blades. The disadvantage of mechanical water flow meters used for water measurement is that when the water becomes dirty or contains larger particles, it can become clogged, leading to increased maintenance costs. When the water flow is low, the mechanical water meter cannot work normally.

  Vortex Flowmeter

  The vortex flowmeter uses the vortex generated by a sensor immersed in the flow. Vortex is a natural force, when fluid flows over obstacles (such as wind blowing over a flagpole or water flowing over rocks), a "vortex" is generated. In the eddy current meter, when each eddy current flows through, the sensor tabs will bend left and right, thus generating a frequency output proportional to the volume flow. The multivariable vortex flowmeter can measure up to five process variables through a process connection: temperature, pressure, density, mass flow, and volume flow. Inserting vortex meters can work well on very large pipes because they can be inserted into the stream by thermal tapping using a retractor.

  Ultrasonic flowmeter

  Ultrasonic water flow meters use ultrasonic waves to measure the volumetric flow rate, thereby measuring the velocity of the fluid passing through the pipe. In an ultrasonic liquid flow meter with elapsed time, an ultrasonic signal is transmitted in the direction of the downstream fluid, and then another signal is transmitted against the direction of the upstream fluid. In the most basic form, the time that the sound pulse travels downstream is compared with the time the pulse travels upstream. Using this derivative time, the velocity of the subsequent fluid can be calculated. The meter then uses this flow rate to calculate the volumetric flow rate in the pipeline. In addition, BTU energy measurement can be derived from the volumetric flow and temperature difference between the cold and hot tubes.

  Electromagnetic Flowmeter

  Electromagnetic flowmeters use a magnetic field to measure volumetric flow, thereby measuring the velocity of the fluid passing through the pipe. They are based on the principles of Faraday's law of electromagnetic induction, according to which a liquid generates a voltage when flowing through a magnetic field. The faster the fluid flows, the greater the voltage generated. The voltage generated is proportional to the movement of the water. The electronic device processes the voltage signal into a volume flow. Because electromagnetic flowmeters have medium accuracy, they are not suitable for custody transfer applications, and because there are no ions to measure, they cannot be used to measure pure water.

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