Flowmeter: Paddle wheel designs from Burkert for continuous measurement

11/22/2007



Paddle wheel flowmeters use simple, reliable technology and are suitable for a wide variety of applications for clean liquids. A close relative of turbine designs, paddle wheel sensors use a cross mounted wheel that extends only partially into the flow stream. Burkert has released its 8012 sensor family, offering a variety of configurations of the same technology.

The 8012 family uses either optical or magnetic paddle wheel sensing, and can supply the signal either as a digital pulse or 4-20 mA analog output. The optical version requires that the liquid must be transparent to infrared light.

The unit can install on pipe diameters from 1/4 to 2 in. Paddle wheel technology actually measures liquid velocity (range from 1 to 32.8 ft./sec.) which is then converted to volume based on the pipe diameter. For proper functioning, the pipe must be completely filled with liquid. The installation guide also recommends relatively long lengths of straight pipe up and downstream.

Burkert offers a variety of material combinations, including stainless steel, PVC, PP, and PVDF. Each has its own pressure and temperature limitations. 8012 flow sensors interconnect with other Burkert components, including the 8025 universal remote flow transmitter and 2712 top control valve system.

—Edited by Peter Welander, process industries editor, PWelander@cfemedia.com ,
Control Engineering Weekly News





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