Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1984-09-07
1985-10-22
Karlsen, Ernest F.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 65R, 324 711, 338 34, 338 35, G01R 2726
Patent
active
045491348
ABSTRACT:
A superior moisture probe and technique for assaying liquid and gas streams for moisture concentration in the parts per million (ppm) range, comprises an emf source connected across a pair of adjacent conductive probes separated by a sulfonated aliphatic fluorocarbon membrane, the combination being immersed in the fluid of interest, or in a sealed headspace associated therewith, the former being the preferred mode. With a D.C. emf, the resistance change of the probe, or a value proportional therewith is monitored, and from that value H.sub.2 O concentration is deduced. With an A.C. emf, capacitance, A.C. resistance, and/or impedance of the described probe structure varies proportionately with the concentration of H.sub.2 O in the membrane, and is monitored directly or indirectly to deduce H.sub.2 O concentration. In the latter form of the invention, the conductive components of the probe are desirably clad by a corrosion resistant, impermeable polymeric coating, and in such form, the use of expensive noble metal components for the probe is less critical, and substitution with less expensive conductive materials is thus practical for certain applications.
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Karlsen Ernest F.
O'Shea Kevin D.
The Dow Chemical Company
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