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Chemical dilution system

  • US 9,700,854 B2
  • Filed: 03/15/2013
  • Issued: 07/11/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A chemical dilution system comprising:

  • a first reservoir containing a first concentrated chemical;

    a second reservoir containing a second concentrated chemical, wherein the second concentrated chemical is a solid state product and is different than the first concentrated chemical;

    a container into which a target amount of a diluent required to prepare a diluted chemical solution is dispensed;

    a weighing device positioned to obtain container weight information concerning a weight of the container and any contents thereof;

    a fluid delivery system configured to extract a liquid solution from the container and apply the liquid solution on at least the second concentrated chemical so as to cause the second concentrated chemical to at least partially dissolve and enter the container; and

    a controller configured to receive a dispense request requesting preparation of a requested amount of the diluted chemical solution, determine the target amount of the diluent required to prepare the diluted chemical solution, determine a target weight of the first concentrated chemical required to prepare the diluted chemical solution, determine a target weight of the second concentrated chemical required to prepare the diluted chemical solution, control addition of the first concentrated chemical to the container based on the container weight information until the target weight of the first concentrated chemical is in the container, and control application of the liquid solution on the second concentrated chemical based on the container weight information until the target weight of the second concentrated chemical is in the container,wherein the fluid delivery system comprises a pump and a pick-up conduit extending from a suction side of the pump into the container so that the pick-up conduit is submerged to an increasing extent as the container fills with liquid, andwherein the controller is configured to receive container weight information from the weighing device and to correct an error caused by the pick-up conduit being submerged in the liquid by adjusting the container weight information based on a relationship between the container weight information and at least one known mass of liquid.

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