The general principle of Rospen Industries Loss in Weight feed system is to accurately weigh and control the output of variable products either, continuously or as a batch. As the name suggests, the Loss in Weight concept is primarily based around the application of a weigh system allied to PLC control, the outline specification for the systems shown below. Whilst the weigh function is at the heart of any Loss in Weight system, it does not directly impact the material flow; therefore, the correct design of the storage vessel and the choice of a suitable material transfer are critical and are reflected in the options available. With over 50 years of experience, Rospen continue to supply a range of Loss in Weight solutions to key industries worldwide.
Rospen loss-in-weight systems use single or twin screw feeders (12–250mm dia) with outputs from 1kg/hr to over 100,000kg/hr. Selection depends on material type, with single screws offering a simpler, cost-effective option.
The Rospen weigh unit features a robust, maintenance-free, solid-state design with three cantilever load cells and a self-centralizing mechanism to automatically correct for off-centre loading, temperature changes, and impact inaccuracies.
On larger installations, it is normal to suspend the loss-in-weight hopper, complete with the selected feeder, from 3 or 4 load cells to avoid large turning moments. The outputs of the load cells are summated with a strain gauge amplifier.
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