Electrochemical sensor
AssigneeMettler-Toledo AG
InventorsAndreas Rutz, Daniel Zwahlen
Life of this patent
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Abstract
An electrochemical sensor for potentiometric measurements in a measurement medium has a sensor head (201) at an end of a longitudinal sensor body (203). A sensing electrode (210) and a reference electrode (220) are disposed within the longitudinal sensor body. A liquid junction (223) is established between the reference electrode and the sensing electrode. The sensor is characterized by a protective outer shaft (250) into which a polymeric tube-like structure (230) is disposed, electrically isolating the protective outer shaft from a reference electrolyte.
Claims18
An electrochemical sensor for potentiometric measurements in a measurement medium, comprising:
- a sensor head;
- a sensing electrode, comprising a sensing electrode shaft;
- a longitudinal sensor body, having a proximal end thereof attached to the sensor head, and having a protective outer shaft;
- a sensor sleeve, disposed around the sensing electrode shaft, to define an annular space between the sensor sleeve and the sensing electrode shaft, wherein the sensor sleeve is a polymeric tube-like structure, wherein the polymeric tube-like structure is provided as a film having a thickness in the range of about 0.1 to 0.3 mm;
- and
- a reference electrode, contained in the annular space, comprising a reference element, a reference electrolyte, and a liquid junction that is positioned to establish an electrolytic contact between the reference electrolyte and the measurement medium;
- wherein the sensor sleeve, the sensing electrode and the reference electrode are disposed in the longitudinal sensor body, with the reference electrode is disposed between the sensing electrode and the sensor sleeve, which provides electrical insulation between the reference electrolyte and the protective outer shaft.
An electrochemical sensor for potentiometric measurements in a measurement medium, comprising:
- a sensor head;
- a longitudinal sensor body comprising a protective outer shaft having a proximal end attached to the sensor head;
- a sensing electrode comprising a sensing electrode shaft extending from the sensor head through said protective outer shaft and a sensitive membrane located at a distal portion of the sensing electrode shaft;
- a sensor sleeve located interior to the protective outer shaft and disposed around the sensing electrode shaft to define an annular space between the sensor sleeve and the sensing electrode shaft, wherein the sensor sleeve is a tube-like structure composed of a thin polymeric film with a thickness in the range of about 0.1 mm to 0.3 mm;
- and
- a reference electrode contained within the annular space comprising a reference element interior to said sensor sleeve, a reference electrolyte, and a liquid junction that positioned at the distal portion of the sensing electrode shaft to establish an electrolytic contact between the reference electrolyte and the measurement medium;
- wherein the sensor sleeve, the sensing electrode and the reference electrode are disposed in the longitudinal sensor body, with the reference electrode disposed between the sensing electrode and the sensor sleeve, which provides electrical insulation between the reference electrolyte and the protective outer shaft.
Dependencies are inferred from the claim text.