| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple, inexpensive and reliable solution for determining the quantity of a liquid chemical product remaining in a container. SOLUTION: The method is a method for measuring the quantity of a chemical liquid 26 remaining in a container 10. The container is connected to a means for making the chemical liquid flow from the container to a used location or the other container 24. Weight P<SB>i</SB>of the liquid in the container is measured at time t<SB>i</SB>(i is variable from 0 to n). The measurement is repeated at a time t<SB>i+1</SB>, a time t<SB>i+2</SB>and a time t<SB>n</SB>(n is an integer larger than 3). A weight changeΔP<SB>i</SB>=P<SB>i</SB>-P<SB>i+1</SB>between the time t<SB>i</SB>, t<SB>i+1</SB>is measured forΔt=t<SB>i-1</SB>-t<SB>i</SB>. WhenΔP<SB>i</SB>becomes smaller than a preset fraction F of weight of the container and/or initial weight of the liquid accommodated in the container, a signal S which seems to express that the container becomes empty, is generated. COPYRIGHT: (C)2004,JPO
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