Patent ID: 8988085
Filing Date: 2015-03-24
Classification: G01N

Abstract:
1. An apparatus for measuring the concentration of a low molecular weight alcohol, in an aqueous liquid feed solution, comprising A hydrophilic sensor including a hydrophilic capillary tube being disposed between a first and second co-axial cylinder electrodes to form a first capacitor, a hydrophobic sensor including a hydrophobic capillary tube; said hydrophobic capillary tube having a hydrophobic coating on the its inner diameter, being disposed between the second and a third co-axial cylinder electrodes to form a second capacitor, wherein the hydrophilic and hydrophobic sensors are dipped to the same depth in the aqueous solution to measure the solution concentration, means for measuring the capacitance of the two capacitors, and control means including a control circuit driven by a computer, wherein the difference in capacitance between the two capacitors is a measure of the concentration of the solution, independent of the depth of dipping of the two capacitors in the aqueous solution, wherein the hydrophilic sensor comprises a layer of multiple hydrophilic capillary tubes queued between the first and second co-axial cylinder electrodes, and the hydrophobic sensor comprises a layer of multiple hydrophobic capillary tubes queued between the second and the third co-axial cylindrical electrodes, the layers of capillary tubes being disposed concentrically in circular fashion to create a cylindrical shape.