Batch Loss-In-Weight Feeder

Similar in design to the continuous weigh feeders, Vibra Screw's line of batch feeders are capable of batches from ounces to tons, feeding materials from liquids and fine powders to fibrous or flaky materials. Control of batch size and feed time is provided through a unique control package that eliminates the effects of plant noise and the need for traditional vibration dampening devices. Batch accuracy of 1/4 to 1/2% or better can be achieved.

How does Loss In Weight Feeding Work?

A Loss In Weight feeding system includes a supply hopper or tank, a metering feeder or pump, a supporting scale system, and a microprocessor controller. The system electronically balances tare weight so the controller senses only the weight of the material in the supply hopper.

At time zero, the hopper is full (high weight), and the operator enters the set point or desired feed rate into the controller.

As time and discharge advance, the actual sensed "loss in weight" follows the decreasing scheduled weight ramp whose slope is a direct representation of the desired weight of delivered material per unit of time (set point). The controller makes frequent comparisons of sensed vs. desired rate and alters the feeder's output, keeping it at a set point.

Once the sensed weight reaches the hopper refill level (low weight), the controller locks the feed system into volumetric control. The hopper is recharged, and the loss in weight cycle repeats.

The controller rate disturbance mode protects against any outside weight disturbance that might cause an upset and provides the unique ability to manually load the hopper at any time without disturbing the feed process.

Download the Batch Loss-In-Weight Feeder Product Brochure (1.17 MB PDF)

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