Agitating – Having interrelated feed and discharge means – Recirculating from and to mixing chamber
Patent
1994-12-14
1996-06-04
Cooley, Charles E.
Agitating
Having interrelated feed and discharge means
Recirculating from and to mixing chamber
366140, 3661521, 3661602, 137 93, B01F 1502, G05D 1108
Patent
active
055226604
ABSTRACT:
Apparatus blending a diluent liquid, i.e., DI water, with a chemical concentrate, a flow duct and mixing tank forming a closed loop for mixing; a pair of flow duct portions each having a conductivity sensor inductively sensing chemical concentration in the blended liquid; a comparator for comparing the outputs of said parallel sensors; a single pump circulating blended liquid around the closed loop and drawing chemical concentrate from a source through an adding valve which cycles open and closed under control of the concentration sensors; the pump also propelling the blended liquid from the closed loop to the point of use, and conductivity sensors existing in individual housings through which the blended liquid flows upwardly to minimize any collection of bubbles adjacent the sensors.
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Sensor Instruments For Conductivity Measurement And Control, Great Lakes Instruments, 6 pages-(Admitted Prior Art.).
Great Lakes Instruments--Operating Instruction Manual, Model 3600-Series Electrodeless Conductivity Sensors, Manual No. 201, Revision 2-891, 16 pages (Admitted Prior Art.).
FSI International, Inc. Exhibit 1--Schematic Drawing (Admitted Prior Art.).
FSI International, Inc. Exhibit 2--Schematic Drawing (Admitted Prior Art.).
O'Dougherty Kevin T.
Sandquist Alden W.
Cooley Charles E.
FSI International Inc.
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