Patent ID: 6845298

Claim:
A dilution system for a chemical comprising: a dilution tank of known capacity for preparing the chemical in a desired diluted concentration, the tank mounted upon an electronic scale, the scale being capable of generating a series of weight signals related to the weight of the tank when empty and at various levels of filling; a source of liquid concentrated chemical feed having a first, but variable, concentrated chemical concentration; a chemical feed flow controller for controlling the flow of concentrated chemical feed to the dilution tank; a source of liquid diluent; a diluent flow controller for controlling the flow of diluent to the dilution tank; a system controller: for receiving: (a) a value related to the dilution tank capacity; (b) a value related to the variable, concentrated chemical concentration; (c) a value related to the desired diluted concentration; and (d) a series of weight signals from the scale; for calculating the amounts of concentrated chemical and diluent required to provide a target amount of diluted chemical of desired diluted concentration which does not exceed the known capacity of the dilution tank; for controlling the chemical feed flow controller and the diluent flow controller based upon the series of weight signals to produce a produced quantity of diluted chemical, the produced quantity related to the target amount of diluted chemical and not exceeding the capacity of the dilution; and wherein the chemical undergoes degradation over time and the value related to the variable concentrated chemical concentration is a value usable by the system controller to calculate a concentrated chemical concentration value.