Measuring weight by integrating flow

A method of filling receptacle with a substance to a reference net weight of said substance by means of a filler member disposed to fill the substance into the receptacle while the receptacle is being carried by a weighing member which measures a force including a weight of said receptacle, a net weight of said substance in said receptacle and a force applied by flow of said substance against a surface of said substance in said receptacle, and compensating for a tail-back weight equal to an amount of said substance discharged from said filler member into said receptacle after flow therefrom is stopped, the method comprising the following steps:

• forwarding previously calculated information concerning the tail-back weight of a first receptacle corresponding to said filler member and said substance;
• controlling the flow of said substance into a subsequently filled second receptacle by means of the filler member;
• measuring, over successive time intervals, the instantaneous flow rate of said substance filled into the second receptacle;
• calculating a total weight of said substance filled into the second receptacle by calculating a weight increment of said substance from said filler member over one said time interval by multiplying;
• the instantaneous flow rate over said one time interval by said time interval and summing the calculated weight increments over all said time intervals;
• and
• causing the flow of substance to stop when the calculated total weight reaches the reference net weight minus said calculated tail-back weight for the substance.