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Description
SITRANS WW100 is a high-accuracy, low capacity weighfeeder for minor ingredient additives.
The unique long length platform weigh bridge mounts directly to a corrosion-resistant platform
load cell. An adjustable mechanical shear gate profiles the material and fixes the correct
material bed depth for a given material application. The belt speed can be automatically
adjusted to attain the correct feed rate.
SITRANS WW100 comes with a weigh bridge, speed sensor, variable frequency drive (if
ordered), and calibration test chain (if ordered). An integrator is required to complete the
system.
3.1
Weighfeeder operation
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 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 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).
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.
3.2
WW100 Operation
This weighfeeder 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.
SITRANS WW100
Operating Instructions, 06/2018, A5E33560618-AC
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