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摘要

Fluid is flowed from a source container to a weighing container and from the weighing container, the flow to the weighing container being controlled to keep the weight of fluid in the weighing container within predetermined limits. A warning may be provided if the amount in the weighing container falls below a warning amount, fluid then being directed to the container from a different source. Flow from the weighing container may be shut down, if the weight falls below a fail safe amount.