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Gravimetric Feeders Offer a Window into Your Process

Use this Chart to Help You Choose the Best Weighfeeder for Your Process

In gravimetric feeding, dry bulk material or liquid is fed into a process at a constant weight per unit of time since weight is a variable that can be captured by a weighing module. Consistent control and complete monitoring are possible. In principle, gravimetric feeding combines monitoring of the feeding process with a feedback loop that enables accurate material control.

Download PDF: Coperion K-Tron Weigh Feeder Accuracy

picture of Modular Loss-in-Weight Feeder

Modular Loss-in-Weight feeders



Gravimetric feeding for varying density, material handling automation, long term accuracy, repeatability and quality documentation, and where dust control is a concern.

picture of Bulk Solids Pump Feeder

Bulk Solids Pump™ (BSP) feeders


  • BSP-100
  • BSP-135
  • BSP-150


Precise volumetric feeding of free flowing bulk materials, e.g. pellets & granules. The feeder can be upgraded to a loss-in-weight feeder system at any time.

picture of Microfeeder

Microfeeder and Compact feeders for very low feed rates


  • Twin screw (microfeeder and compact feeders)
  • Single screw
  • Vibratory
  • Liquid


The Microfeeder and Compact loss-in-weight feeders are optimized for laboratory applications, pilot projects, or feeding minor ingredients with high accuracy and recipe repeatability. Use the Microfeeder for feed rates as low as 0.04 dm³/hr (0.0014 ft³/hr). Use Compact Feeders for any low feed rate application where space is limited and high accuracy and recipe repeatability are required.

picture of Smart Weigh Belt Feeder

Smart Weigh Belt (SWB) feeders


  • SWB 300 / 600 - These models available with continuous online autotare
  • SWB 650 / 800 / 1000 


Gravimetric feeding at higher feed rates or where low headroom is a problem. Especially at high feed rates, a weigh belt feeder offers lower initial cost than a loss-in-weight feeder with equal throughput.

picture of Liquid Loss-in-Weight Feeder

Liquid Loss-in-Weight feeders



For high accuracy gravimetric feeding of liquids. The complete liquid loss-in-weight system (feeder, scale, pump, piping) is available in special skid mounted designs which are completely portable for movement throughout the plant.

Coperion K-Tron Systems Group specializes in designing and integrating both liquid and powder loss-in-weight systems for applications such as extrusion.

picture of Smart Flow Meter

Smart Flow Meter (SFM) with SFT weighing for high rate mass flow control


  • KSF 275
  • KSF 350


Metering, monitoring or totalization of bulk material flows, or as feeder in high rate applications.

picture of K4G Gravimetric Blender

K4G Gravimetric Blender for pellets and multi-stream ratio control


  • 4-6 feeders


Compact design and low space requirements allow four to six feeders with Coperion K-Tron vacuum receivers to be easily grouped around an extruder inlet. A wide variety of standard feeders, including the Bulk Solids Pump (BSP), can be integrated onto the K4G single-point weighing system.

The K4G Continuous Gravimetric Blender System was designed with the specific requirements of the plastics processing industry in mind. The compact design and low space requirements of the K4G integrated system allow four or six feeders with integrated vacuum receivers to be easily grouped around an extruder inlet. Single stations are also available.

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