| 摘要 |
PURPOSE:To accurately measure many kinds of raw liquids by varying the divergence of respective regulating valves in accordance with the received liquid variables on the liquid receiving vessel side in case of cumulatively metering a plurality of liquids from a plurality of vessels into a liquid receiving vessel and mixing. CONSTITUTION:When N chemicals are used for a group M of liquids which make no pollution problems or the like between the liquids to be metered cumulatively, liquid receiving vessels 4 and metering devices 5, each two units, are provided for a plurality of feeding liquid vessel 1. The liquid receiving vessels 4 can be transferred by an unmanned truck 9 and is operated efficiently by minimizing fixed pipings. When metering, the opening of opening regulating valves 2 is regulated basing on the deviation and deviation variability with time computed between the weight of raw liquid sensed by the metering devices 5 and the metering set values. In other words, after starting metering, the opening of the divergence regulating valve 2 is drawn when metering deviation gets smaller and generate micro-flow rate, and the metering accuracy is not dependent on the flow rate variations and enhanced. |
