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Volumetric compensation in gravimetric liquid measurement

  • US 5,184,753 A
  • Filed: 09/20/1991
  • Issued: 02/09/1993
  • Est. Priority Date: 09/20/1991
  • Status: Expired due to Fees
First Claim
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1. An improvement in a liquid metering apparatus in which a desired amount by weight of a liquid is measured by the placement of a corresponding volume of liquid in a metering chamber between a first location and a second location in the metering chamber, the liquid metering apparatus including compensating means for compensating for variations in the density of the liquid within the metering camber resulting from variations in the temperature of the liquid within the metering chamber, within a range of temperatures, by varying the volumetric capacity of the metering chamber between the first location and the second location, the improvement comprising:

  • volumetric capacity modifying means including a plurality of incremental volumetric elements of predetermined volume arranged for selective operation to establish changes in the volumetric capacity of the metering chamber by corresponding increments of volume, each one of which increments of volume extends from the first location to the second location and corresponds to the predetermined volume of each respective one of the incremental volumetric elements; and

    actuating means for selectively operating one or more of the incremental volumetric elements of the volumetric capacity modifying means to effect a change in the volumetric capacity of the metering chamber by one or more increments of volume, each one of the increments of volume extending from the first location to the second location and corresponding to the predetermined volume of each respective one of the volumetric elements selectively operated by the actuating means, in accordance with the temperature of the liquid placed within the metering chamber;

    whereby the volumetric capacity of the metering chamber between the first location and the second location is made to correspond to the volume of liquid in the desired amount by weight of the liquid at the temperature of the liquid within the metering chamber.

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