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  • Enclosed Weigh Screw
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Loss in Weight Feeders - Enclosed Weigh Screw

Principle and Operation

The Rospen Industries Enclosed Weigh Screw is designed for the continuous weighing of dusty, aggressive, or toxic powders, to accuracies of ± 0.5% at rates up to 60 tonnes tonnes/hr. The machine consists of a Metering Screw Feeder, which pre conditions and meters the product by volume into a short weigh screw, turning at a variable speed through which the product is conveyed. With the Weigh Screw located on a weigh platform the PLC provides a fail safe, positive indication of material flow-rate change, variation in density or moisture level or a change in material characteristics.

The output signal from the weight controller can also be used to:

  • Initiate an error alarm.
  • Indicate flow rate.
  • Totalise flow.
  • Control the output of other metering devices in ratio. This method allows the output of several metering feeders or liquid pumps to be ‘rationed’ and held in close tolerance.
The features of the Rospen Industries, Enclosed Weigh Screw, have been developed in conjunction with customers worldwide for over 25 years. Yet the design continues to develop, as industry and legislative demands are met.
  • Continuous, uninterrupted weighing accuracy to ± 0.5%
  • Totally enclosed providing dust tight control of toxic or hazardous materials.
  • Insensitive to shock or vibration.
  • Low maintenance design, easy to strip down and maintain.
  • Instant response without process lag.
  • Small installation space required.

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