Filling by weight has many advantages compared to volumetric filling with flowmeters or other such devices, including accuracy, ease of calibration, and facilitation of statistical process control and traceability. A huge variety of materials are filled and a corresponding variety of fillers use; weighing is the one universal technology that can be used regardless of the material or container characteristics.
METTLER TOLEDO, with its comprehensive range of globally-approved weighing solutions based on two different sensor technologies, can meet the challenge of just about any filling requirement. This guide will explore the different technologies in use today, along with their advantages and disadvantages so you can improve the performance of your filling technology and operations.
Successful Integration of Weighing: Filling Guideline
Filling Guideline
Filling by weight has many advantages compared to volumetric filling with flowmeters or other such devices, including accuracy, ease of calibration, and facilitation of statistical process control and traceability. A huge variety of materials are filled and a corresponding variety of fillers use; weighing is the one universal technology that can be used regardless of the material or container characteristics.
METTLER TOLEDO, with its comprehensive range of globally-approved weighing solutions based on two different sensor technologies, can meet the challenge of just about any filling requirement. This guide will explore the different technologies in use today, along with their advantages and disadvantages so you can improve the performance of your filling technology and operations.
Table of Contents
Executive Summary ............................... 5
Why Read this Guideline? ........................... 6
Gravimetric vs. Volumetric Filling ..................... 7
Select the Right Filling Method ....................... 2
Net Weight Filler ............................................ 2
Loss-in-Weight Filler ......................................... 2
Gross Weight Filler ........................................... 3
Summary ................................................. 4
Filling Machines .................................. 5
Bag Fillers .................................................... 5
Gross Weight Filling of Bags .................................... 5
Bucket, Drum and IBC Fillers ....................................... 6
Gross Weight Filling of Buckets, Drums and IBCs ..................... 6
Big Bag Fillers ............................................. 9
Gross Weight Filling of Big Bags ................................ 10
More Demanding Applications ....................... 12
Influence of Fill Material on Accuracy ................. 14
Speed vs. Accuracy ............................... 16
Increasing Throughput ....................................... 18
Filling Process and Control ......................... 19
Filling Process ................................................ 19
Fast & Fine Feed ............................................... 20
Spill ........................................................ 21
Jog ........................................................ 21
Control ...................................................... 22
Key Filling Machine Components .................... 24
Feeders ..................................................... 24
Load Sensors ................................................. 25
Weighing Devices Based on High Resolution MFR Sensors .............. 25
Weighing Devices Based on Strain-Gage Sensors .................... 26
Terminals .................................................... 31
Importance of A/D Conversion and Filtering ........................ 31
Digital Input/Output ......................................... 31
Connectivity for Control Systems or Data Processing .................. 32
Dedicated Weighing Terminals for Filling Applications ................. 32
Advanced IND780 Q.iMPACT Filling Controller ....................... 34
Weighing Equipment for Hazardous Areas .............. 35
Commercial/Legal Requirements ..................... 36
Requirements for the USA ........................................ 36
Requirements for the European Union ............................... 37
References ..................................... 38
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