Flow Technologies

Magnetic Flow / Magflow Meters

Since their introduction in the 1950s, Magflow electromagnetic flow meters have become one of the most widely used flowmeter types for measuring water and other liquids. Also known as Magmeters, magnetic flow meters or induction flow meters, they function with conductive fluids to measure flow across a controlled magnetic field. The magnetic flow meter design offers some very important advantages especially with...


Paddle Wheel

Principles of Operation Paddle wheel flow meters consist of three primary components: the paddle wheel sensor, the pipe fitting and the display/controller. The paddle wheel sensor consists of a freely rotating wheel/impeller with embedded magnets which is perpendicular to the flow and will rotate when inserted in the flowing medium. As the magnets in the blades spin past the sensor, the paddle wheel meter generates...



Principles of Operation The basic construction of turbine flow meters includes a bladed turbine rotor which is axially suspended in the pipe. As the fluid flows through the pipe, it causes the rotor to spin on its axis at a speed which is proportional to the velocity of the fluid. The passage of each rotor is sensed by the turbine meter using gears, photoelectric cell or magnetic pickup installed on the outside of...



Selecting Vortex Flow Meters Vortex Flow Meter Principle of Operation Under certain conditions vortices regularly form downstream of an object (bluff body) placed in a flowing fluid and shed on alternating sides of the stream. This phenomenon is commonly called a Karmen vortex street. The resultant vortex frequency is proportional to the fluid velocity and hence the flow rate can be calculated by counting the number...


Oval Gear Flow Meters

Oval gear flow meters are traditional, mechanical, positive displacement (PD) flow meters, first invented more than 50 years ago by OVAL Corporation of Japan and now widely used for flow metering applications. Oval gear meters measure flow by employing a geared rotor to pass known volumes of a fluid through a housing. Principles of Operation The oval gear flow meter comprises oval-shaped, geared rotors which rotate...


Coriolis Meters

How the Coriolis Force works inside a Flow Meter Coriolis meters have a sine wave voltage applied to an electromagnetic drive which produces an oscillating motion of the tube. The amplitudes are related to the mass flow and the frequency is related to the product density. The reason that the output amplitude changes with flow may be explained by the Coriolis effect. The vibration of the tube gives a slight angular...


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