Providing batch weighing within +/-1 percent or better, Volkmann controlled weighing and dosing systems can be used in a range of processes, such as feeding a mixer with solids according to a specified recipe, the initial weighing of delivered raw material, unloading smaller batches from big bags, weighing the receiving stirrer vessel, and measured conveying and weighing. Designed to be used in conjunction with Volkmann VS and PPC series of vacuum conveyors, the systems include loss-in-weight at the conveyor feed point, gain-in-weight at the vacuum receiver prior to discharge into the process and a controlled-release dosing weight discharge from the receiver.