Description

Loss in Weight Feeders for small quantities are suitable for the precise dosing of liquids, pastes and solids (powders, granules, fibers, etc.).

  • Compact design for the dosing range of 0.1 kg/h to 10 kg/h
  • The dosing container and the discharge unit are mounted on a load cell
  • A mechanically decoupled refill container fills the medium cyclically into the dosing container
  • The media properties determine the appropriate discharge unit
  • The required dosing performance determines the device dimensions and the mechanical structure
  • Volumetric or gravimetric dosing (depending on type of control)
  • Continuous dosing or batch dosing (depending on type of control)
  • Gravimetric control by Simatic S7 and the epa Loss in Weight Feeder Software (LWF-Software)

Important features

  • Large operational range while maintaining high accuracy
  • Extremely high short-term accuracy
  • Discharge units can be exchanged very quickly

Operating mode

The reduction in system weight per unit of time defines the dosing performance:

  • The dosing container is full (at the start-up or after the refill)
  • The target value computer takes the measured weight value
  • The target value computer calculates continuously the decreasing target weight value from the decreasing system weight during the running discharge
  • The dosing controller compares continuously the measured weight value with the calculated target weight value
  • The difference between the two values is continuously processed in a control loop for correcting the discharge

Note: During a refill operation the control signal average of the last 10 seconds drives the discharge unit.

The media properties determine the appropriate discharge unit:

  • Vibration conveyor discharge
  • Screw discharge (single-shaft screw, double-shaft screw) for poorly flowing material (powder)
  • Pump discharge for liquides and pastes

 

Note: Flex containers made of different materials are used for highly viscous media (e.g. media with the risk of bridging)

Note: Flex containers made of different materials are used for highly viscous media (e.g. media with the risk of bridging)

 

 

Note: Flex containers made of different materials are used for highly viscous media (e.g. media with the risk of bridging)

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