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Almost all the commercial check-weighers contain load cells for measuring the weight of the product and then compare it with the set weight. They usually use “strain gauge” type load-cells technology.  Several load cells can be used to support the conveyor frame.  The small output signals are captured and then combined to get the total weight.  The check-weigher software records a series of weights for the whole time the product travels on the belt on top of the load cells, and provides many functions to ensure that we can get reliable data.

 

Check-Weighers manufacturers and suppliers have many options and techniques to help provide the best accuracy possible, ranging from minimal to moderate cost for standard features and/or enhancements:

 

EMFR Checkweighers

OR

Check-weighing by detecting variation in density of the product on an X-ray machine:

 

 EMFR (Electromagnetic Force Restoration) – based check-weighing involves charging an inductive coil and floating the scale bed in an electromagnetic field. Weight variance cause the movement of a ferrous material through that coil and that creates a fluctuation in the coil current proportional to the weight of the object.  This technology is much more expensive, but more accurate than the traditional load-cell based check-weighers.

 

Traditionally, X-ray machines are used for contaminant inspection, shape confirmation, fill level tests etc. On X-ray inspection machine, check weighing functionality can be achieved by checking the variation within the density of the product and then extrapolating that to show weight variations within the packs. It is bit difficult to calibrate and weights and measures / legal authorities haven’t permitted the use of check-weighing functionality by this method as yet.  

 

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  • Vijay Kumar
    Vijay Kumar

    Can anyone recommend a suitable check-weigher to do 425 grams of cans at 600 CPM or more?

    I know MT may have a suitable solution, looking for some other company who may have a competitive product at these speeds.

    Any suggestions?

    TripleMExpo
TripleMExpo
Dynaweigh DF Series_1

Heavy gauge stainless steel sub frame
Multi Product memory
Quick release conveyor se...

Details
TripleMExpo
Dynaweigh DF Series_2

Heavy gauge stainless steel sub frame
Multi Product memory
Quick release conveyor se...

Details
TripleMExpo
Dynaweigh DF Series_3

Heavy gauge stainless steel sub frame
Multi Product memory
Quick release conveyor se...

Details