Make-up dispense in a mass based dispensing system

摘要

A chemical product dispenser dispenses a chemical product having at least one active ingredient during a primary dispense cycle based on time or some other factor. After the chemical product has been dispensed, the dispenser determines the amount of chemical product that was dispensed. The dispenser then determines whether the dispensed amount of chemical product is within a defined threshold of a desired amount. If not, the dispenser proceeds to dispense additional chemical product during one or more make-up dispense cycles until the threshold is satisfied.

主权项

1. A method comprising:
dispensing a chemical product from a weight based dispenser for a predetermined period of time during a primary dispense cycle, the predetermined period of time based on a dispense rate corresponding to at least one previous primary dispense cycle and a desired amount of the chemical product to be dispensed; determining a dispensed amount of the chemical product based on a start weight of the chemical product in the dispenser at a start of the primary dispense cycle and an end weight of the chemical product in the dispenser after the predetermined period of time has elapsed; calculating a difference between the desired amount of the chemical product and the dispensed amount of the chemical product; determining whether a make-up dispense cycle is required based on the difference; and if a make-up dispense cycle is required, executing a make-up dispense cycle, wherein executing a make-up dispense cycle comprises:
determining a dispense rate corresponding to the primary dispense cycle, wherein determining the dispense rate corresponding to the primary dispense cycle comprises dividing the dispensed amount of the chemical product by the predetermined period of time;computing a make-up dispense cycle time based on the difference between the desired amount and the dispensed amount and the dispense rate corresponding to the primary dispense cycle; anddispensing the chemical product for the computed make-up dispense cycle time, wherein dispensing the chemical product comprises eroding the chemical product with a diluent.