Electronic Pressure Compensation EPC

The reliable and cost-effective alternative to traditional mechanical pressure compensation

Why variations in pressure can be an issue in your feeding system

Pressure fluctuations can seriously impact the weighing accuracy of a feeding system. Where gravimetric feeders operate in a closed system, changes in pressure within the feeder hopper or the outlet tube may push up or down on the feeder resting on its scale or load cells. This leads to incorrect weight signals, causing erroneous mass flow and poor feeding accuracy.

How to remedy the pressure trouble

Traditionally, these troublesome pressure fluctuations have been compensated for by mechanical means such as flexible bellows. Mechanical tolerances, the alignment and age of the bellows, etc. are factors which can impact the mechanical pressure compensation and prevent it from fully compensating for the forces generated by changing pressures, making this costly solution deficient.

Coperion K-Tron has addressed these issues with the development of the effective but simple Electronic Pressure Compensation, EPC™. This solution has shown to significantly improve feeding accuracy of gravimetric feeders in closed systems and can be less expensive than traditional solutions. In addition, EPC™ is more effective and reliable, maintenance free, and easy to retrofit on existing systems.

The technology behind EPC

Function principle of the EPC with sensors both on the hopper lid and the discharge

With EPC the Coperion K-Tron Control Module (KCM) uses the data from a pressure sensor mounted in the hopper lid and/or discharge tube to adjust for changes to the weight signal caused by variations in pressure. The KCM dynamically compensates the weight to eliminate the weighing error. The EPC measures Gauge Pressure (relative to atmosphere) and will measure and correct for pressure fluctuations in the range of +50 mbar. If the pressure is outside of this range an alarm will be generated.

Download Product Specification Sheet

Benefits & Features

  • Simple, cost-effective design
  • Fewer parts compared to mechanical solutions
  • Easy to install and clean, maintenance free
  • More effective and reliable than mechanical solutions
  • Easy to retrofit on existing systems
  • Pressure data available electronically
  • Alarms on over-/under-pressure


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Working principle of the Electronic Pressure Compensation EPC

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