Extended Cycle Time at Highest Accuracy

The performance of feeders range from 100g up to 50,000 kg per hour. The accuracy ranges from 0.25 to 1 %. The maximum achievable accuracy depends on the properties of the material being dispensed. A characteristic of loss in weight feeders is the cyclical change between controlled gravimetric dispensing and uncontrolled volumetric dispensing during refilling.
The uncontrolled volumetric dispensing during refilling has to be kept as brief as possible in order to achieve accurate results. An suitable electronic feeder control and a conveyor, which fits to the material properties of the dispensed product, can strongly improve performance of loss in weight feeders strongly. However, the dispensing accuracy depends to a large extent, on the quality of the weighing technology.

Criteria for weighing technology for a loss in weight feeder:

• Controller technology with high quality signal processing to filter out vibrations
• Fast data transfer for short cycle time of closed loop controller
• Good linearity over the entire measuring range
• High weighing capacity to carry heavy feeder, hopper and metering device
• High weighing capacity to store a lot of material inside the hopper
• Solid construction with overload protection for fast refilling of the hopper

WMH modules combine The very high weighing capacity of WMH modules combined with the highest resolution and fast signal processing perfectly meetsing the above mentioned requirements perfectly. The WMH can carry heavy feeders, hoppers and metering devices. It substitutes the often seen complex structures with several weighing cells and its associated control electronics. The use of the WMH weigh moduleplatform extends the cycles of the controlled gravimetric dispensing mode and shortens the uncontrolled dispensing during refilling duethanks to more material inside the hopper. The overload protection in combination with the stainless steel housing in IP66/67 ensures high availability and allows fast refilling of the hopper. Thus, WMH weigh moduleplatforms significantly simplify the design of lLoss iIn wWeight Ffeeders significantly. The EMFR (electromagnetic force compensation) weighing technology used in the WMH is excellent for lLoss iIn wWeight Ffeeders because its output is not based on a frequency measurement. The EMFR technology doesn’t have the risk, that vibrations, shocks and temperature changes are misinterpreted as changes in weight.
Actually the force compensation cell acts as an active vibration damping which filters vibrations and shortens the stabilization period. Benefit from the advantages of the EMFR technology used inside WMH weigh moduleplatforms. Achieve higher accuracy whilset reducing process optimization efforts. Your customers will dispense faster, longer and more precise.


Material stock in hopper over time of Loss In Weight Feeder with WMH against traditional weighing technology


Dispensing volume over time of Loss In Weight Feeder with WMH versus traditional weighing technology.