System comprising pH/ORP electrodes with improved anti-poisoning characteristics
AssigneeABB Schweiz AG
InventorsBenjamin Carr, Kenton Knight
Life of this patent
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Abstract
A reference electrode system for a pH-sensor system includes: a first junction having a membrane with a sealed side; a reference electrode, the reference electrode and/or an electrically conducting wire of the reference electrode being covered completely except for an end portion of the reference electrode, by a sleeve; and a tube that is arranged, at least partly, around the reference electrode, the electrically conducting wire, and the sleeve, the tube having a closed end which is arranged near the end portion of the reference electrode.
Claims11
A reference electrode system for a pH-sensor system, the reference electrode system comprising:
- a first junction comprising a membrane with a sealed side;
- a reference electrode, comprising a top end portion and a bottom end portion, wherein the reference electrode and/or an electrically conducting wire of the reference electrode is covered completely, except for the bottom end portion of the reference electrode, by a sleeve and wherein the top end portion and/or the electrically conducting wire protrudes from the sleeve;
- and
- a tube, having an open top end portion and a closed bottom end, the tube being arranged, at least partly, around the reference electrode, the electrically conducting wire, and the sleeve, the closed bottom end of the tube being arranged near the end of the bottom portion of the reference electrode;
- wherein the closed end of the tube prevents ions from penetrating therethrough.
A method for manufacturing a pH-sensor system, the method comprising the steps of:
- providing a sensor enclosure, a first end of the sensor enclosure being open;
- arranging a measuring electrode at least partly in the sensor enclosure and connecting the measuring electrode to a first electrically conducting wire;
- arranging a reference electrode, comprising a top end portion and a bottom end portion, at least partly in the sensor enclosure and connecting the reference electrode to a second electrically conducting wire;
- covering the reference electrode and/or the second electrically conducting wire completely, except for the bottom end portion of the reference electrode, by a sleeve and wherein the top end portion and/or the electrically conducting wire protrudes from the sleeve;
- arranging a tube, having an open top end portion and a closed bottom end, the tube being arranged, at least partly, around the reference electrode, the wire, and the sleeve, the closed bottom end of the tube being arranged near the end of the bottom portion of the reference electrode, wherein the closed end of the tube prevents ions from penetrating therethrough;
- and
- arranging, at or close to the first end, a first junction comprising a membrane with a sealed side so as to seal a front-side of the membrane from a back-side of the membrane.
Dependencies are inferred from the claim text.