Patent ID: 7799193

Claim:
An electrochemical sensor, comprising: a housing defining a longitudinal axis, the housing having an outer wall and a plurality of longitudinal walls disposed within the outer wall, in which the longitudinal walls are aligned with the longitudinal axis and radiate outwardly relative to the longitudinal axis, the longitudinal walls defining a plurality of longitudinal chambers disposed circumferentially about the longitudinal axis, selected number of the plurality of the longitudinal walls including wall apertures that enable ionic communication to flow between the longitudinal chambers, the housing including a proximal end and a distal end configured to be proximate to a target fluid; a reference electrode disposed within a reference chamber of the housing; and a junction plug disposed at the distal end of the housing, the plug having a first surface configured to contact the target fluid and a second surface, the junction plug comprising a porous material that enables ionic flow through the junction plug from the first surface to the second surface; wherein ionic communication between the target fluid and the reference electrode within the reference chamber must pass sequentially through the plurality of longitudinal chambers from a first longitudinal chamber to reach the reference chamber.