White WW200 Operations Instructions download pdf (Page 9)

7ML19985MS01 SITRANS WW200 - OPERATING INSTRUCTIONS Page 5

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Operation

Weighfeeders

Weighfeeders weigh bulk material while it is conveyed. An accurate rate of flow and

totalized weight measurement is received without interrupting the flow of material in

process. A weighfeeder can also control the rate of flow of the conveyed product.

In-motion weighing requires accurate transmission of the product load to strain gauge

load cells. The resulting voltage signal corresponding to weight is transmitted to the

integrator and becomes one of the two inputs required for integration.

Unlike static weighing, in-motion weighing integration requires a second input: a pulse

signal proportional to the speed of the conveyor belt. Each belt speed sensor pulse

represents a fixed distance of the travel.

Since the force measured by the load cell is represented as weight per unit length, it can

be multiplied by the distance of belt travel (one speed sensor pulse) to provide product

weight for that segment of the belt (lbs/ft x ft = lbs, or kg/m x m = kg).

Adding the samples provides total throughput weight of product across the scale. With

proper scaling and calibration, the total weight can be displayed in kilograms, pounds,

short tons, long tons, metric tons, or other appropriate units.

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White WW200 Operations Instructions Page 9