Patent ID: 7410615

Claim:
A system for dispensing of reagent, said system comprising: a reagent reservoir containing a fluid reagent to be dispensed, an air pressure regulating device coupled to said reservoir for maintaining said reagent under a controlled air pressure, multiple nozzles in fluid communication with said reservoir for dispensing said reagent, multiple solenoid valves in direct fluid communication with said reservoir and said nozzles controlling the flow of said reagent from said reservoir to said nozzles, each of said valves being connected to one of said nozzles, and a solenoid valve controller connected to said solenoid valves and supplying electrical pulses separately to each of said solenoid valves to separately control the opening and closing of each valve to dispense predetermined quantities of said reagent through each of said nozzles, wherein said solenoid valve controller includes a calibration table that specifies the widths of said electrical pulses required to dispense specified volumes of said reagent, and is responsive to the selection of a desired volume not specified in said table for calculating a required pulse width from the pulse widths specified in said table for the two specified volumes closest to said selected desired volume.