Patent ID: 8211282

Claim:
An electrochemical sensor, comprising: a housing including a proximal end and a distal end, the distal end configured to be proximate to a target fluid, thereby defining a longitudinal axis, the housing having an outer wall that circumscribes the housing, the housing defining a plurality of longitudinal chambers disposed within the confines of the outer wall of the housing in which the longitudinal chambers are aligned with the longitudinal axis, wherein the housing is configured to enable ionic communication to flow between the longitudinal chambers; a reference electrode disposed within a reference chamber of the housing; and a junction 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 traveling in alternating longitudinal directions from a first longitudinal chamber to reach the reference chamber.