Probe having coaxial design for use with dissolved oxygen meter

Details Probe having coaxial design for use with dissolved oxygen meter Probe having coaxial design for use with dissolved oxygen meter

1994-04-19

1996-06-18

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 205783, G01N 27404

Patent

active

055274447

ABSTRACT:
A probe is disclosed for use with a dissolved gas meter, which is capable of measuring the concentration of dissolved gas in a fluid by measuring the permeation of gas through a membrane into an electrolyte solution. The probe includes an inner member, preferably tubular, disposed inside an outer member, preferably tubular, each tubular member having an open top end. Preferably, the inner tubular member and the outer tubular member are coaxially located such that an annular space is formed between the inner and outer tubular member. The probe further includes a plurality of electrodes operably connected inside the probe to the meter. A counter electrode extends into the central chamber of the inner tubular member, along the central axis. A working electrode is wrapped around the outer tubular member. A reference electrode is wrapped around the inner tubular member. A membrane, preferably made of silicone elastomer material, covers at least a portion of the outer tubular member and encloses the working electrode so as to form a pocket around a portion of the working electrode. Electrolyte solution is injected into the top of the inner tubular member and flows from a central chamber in the inner tubular member to the outside of the outer tubular member and around the working electrode through a series of holes, which create passages for the flow of the solution. As such, the electrodes are in at least in partial fluid communication with the electrolyte solution.

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