Patent ID: 7110861

Claim:
A system for diluting a chemical for water treatment comprising: a dilution control system 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; and 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 tank; and a source of water, wherein the dilution control system continuously creates small weight-based batches of the diluted chemical of desired diluted concentration based on changing water demands from the source of water.