Measurement of quantity of incompressible substance in a closed container

• Main Authors: SCHMITT; JOHN V, MARSH; RICHARD A
• Format: Patent
• Language: English
• Published: 21.03.2000
• Edition: 7
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

In a process and apparatus for delivering a processing substance from a storage vessel to a processing station, the storage vessel enclosing a processing substance storage space and being coupled to conduits which communicate with the storage space, the storage vessel and the conduits enclosing a volume which includes the storage space, a method and system for determining the quantity of processing substance in the storage space by: closing the volume enclosed by the storage vessel and the conduits; performing first and second pressure measurements for measuring the gas pressure in the volume when the volume contains respectively first and second quantities of gas; determining the difference between the first and second quantities of gas; and calculating the quantity of processing substance in the storage space on the basis of the volume, the difference between the first and second quantities of gas and the gas pressures measured during the first and second pressure measurements.