Patent ID: 8158083

Claim:
A system for dispensing of reagent, said system comprising: a first reservoir containing a fluid reagent to be dispensed, an air pressure regulating device coupled to said first reservoir for maintaining said fluid reagent under a controlled air pressure, multiple nozzles each in fluid communication with said first reagent reservoir for dispensing said fluid reagent, multiple solenoid valves connected between said reservoir and said nozzles for controlling the flow of said fluid reagent from said first reservoir to said nozzles, each of said valves being connected to one of said nozzles, and a system controller connected to said solenoid valves and configured to receive a separate dispense volume for each of the multiple nozzles and further configured to provide electrical pulses separately to each of said solenoid valves to separately control the opening and closing of each valve to dispense the separate dispense volume of reagent through each of said nozzles, wherein the controller is further configured to set a pulse width for the electrical pulses based on the separate dispense volume for each of the multiple nozzles; wherein the system is configured such that the controlled air pressure causes fluid reagent to be dispensed through a nozzle upon opening of a corresponding one of the multiple solenoid valves.