Thursday, April 24, 2014

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Weighfeeders


A completely different kind of flowmeter is the weighfeeder, used to measure the flow of solid material such as powders and grains. One of the most common weighfeeder designs consists of a conveyor belt with a section supported by rollers coupled to one or more load cells, such that a fixed length of the belt is continuously weighed:
 

The load cell measures the weight of a fixed-length belt section, yielding a figure of material weight per linear distance on the belt. A tachometer (speed sensor) measures the speed of the belt. The product of these two variables is the mass flow rate of solid material “through” the weighfeeder:


Where,

   W = Mass flow rate (e.g. pounds per second)

   F = Force of gravity acting on the weighed belt section (e.g. pounds)

   S = Belt speed (e.g. feet per second)

   d = Length of weighed belt section (e.g. feet)

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