Patent ID: 6033543
Filing Date: 2000-03-07
Classification: C03B,C03C

Abstract:
An electrochemical sensor, comprising:(a) an elongated vertical housing including a pair of inner and outer glass tubular portions (4, 6) arranged in concentrically spaced relation, said tubular portions having adjacent spaced peripheral surfaces;(b) a conductive strip (8) extending longitudinally of and mounted continuously on one of said tubular portion peripheral surfaces, said conductive strip having an end portion that terminates within the exterior annular chamber defined between said tubular portions;(c) said tubular portions being connected at a first location intermediate the ends of said conductive strip by a first connection (2) defined by a radially outwardly extending annular bulge in said inner tubular portion and a radially inwardly directed constriction on said outer tubular portion, said bulge and said constriction being joined solely by a locally-heat-melted autogenous joint containing the associated portion of said conductive strip;(d) said tubular portions having end portions that are connected by a second connection (112) defined by a locally-heat-melted joint;(e) an end cap member (134) closing the bottom of said inner tubular portion, thereby to define an interior chamber within said tubular portion;(f) a first electrode (106) arranged within said exterior chamber, said first electrode being electrically connected with said conductive strip end portion;(g) a second electrode contained within said interior chamber;(h) a reference solution contained within said exterior chamber covering at least a portion of said first electrode; and(i) a buffer solution contained within said interior chamber covering at least a portion of said second electrode.