Precision fluid dispersing apparatus and method
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United States of America Patent
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Nov 7, 1995
Issued Date -
N/A
app pub date -
Mar 10, 1995
filing date -
Jul 9, 1993
priority date (Note) -
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Abstract
A precision liquid reagent fluid dispensing apparatus (10) and method includes a continuously operating pump (16) inducting and pressurizing ambient air. The pressurized air is delivered at a first location into a flow-through volume (18) with provision to substantially completely abate at a second location any noncontinuous air flow or air pressure variations from the pump. A long-lived pressure sensor (32) which is substantially free of drift is associated with the flow through volume at a third location and provides a signal indicative of sensed air pressure. A controller (36) by reference to a calibration standard for the sensor provides a time-variant control signal in response to the sensed air pressure. At a forth location a duty cycle valve (38) vents pressurized air from the flow through volume in response to the control signal to provide at the second location a precisely regulated dispensing air pressure. The dispensing air pressure is applied via a reagent liquid container (46) and closure member (62) to a liquid reagent to pressurize this reagent for dispensing at a precise rate via a dispensing valve (82). The dispensing valve is sealingly carried by the closure member to reduce leakage paths and corrosion opportunities in the apparatus of the present invention.
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