APPARATUS AND METHOD FOR DISPENSING MATERIALS VOLUMETRICALLY AND GRAVIMETRICALLY BASED ON A STORED FORMULA

摘要

A dispensing system includes a controller, a scale, a plurality of pumps and containers for dispensing a plurality of ingredients. After a formula is selected, the controller executes a portion of the motion of the pump required to dispense the target amount of a first ingredient. The remaining amount may be dispensed iteratively using a calibration table based on historical overshoot data. Alternatively, it may be divided by a factor to generate a "first half " value. The controller may then use a calibration table to calculate a motion of the pump needed to dispense said value. After that, the actual amount dispensed is measured and compared to the first half value and the difference is multiplied by said factor and added to the first half value to generate a "second half" value which is dispensed.