Operation; Weighfeeders - Siemens SITRANS WW100 Operating Instructions Manual

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 a strain gauge
load cell. 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 belt 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).
SITRANS WW100 is designed for assembly for both left and right side belt change. The
unit can be dis-assembled and re-assembled on the opposite side with the same
components.
Enclosed
Page 6 SITRANS WW100 - OPERATING INSTRUCTIONS
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