A method and apparatus (10) for dispensing precise quantities of liquid reagent (14) is disclosed including a positive displacement syringe pump (22) in series with a dispenser (12), such as an aerosol dispenser (12a) or solenoid valve dispenser (12b). The pump (22) is controlled by a stepper motor (26) or the like to provide an incremental quantity or continuous flow of reagent (14) to the dispenser (12). The pump (22) and dispenser (12) are operated in cooperation with one another such that the quantity and/or flow rate of liquid reagent (14) dispensed by the dispenser (12) can be precisely metered substantially independently of the particular operating parameters of the dispenser (12) to attain a desired flow rate, droplet size or mist quality, droplet frequency and/or droplet velocity.

Title
Dispensing apparatus having improved dynamic range
Application Number
97198220
Publication Number
1231621
Application Date
July 25, 1997
Publication Date
October 13, 1999
Inventor
T C Tisone
Agent
zhao xin
Assignee
Bio Dot
IPC
G01N 35/10
B05B 17/06
B05B 12/06
B05B 09/04
B05B 07/24
B05B 01/30
B01L 03/02