Sensor for measuring the partial pressure of a gas of the type comprising an elecrtrochemical cell and a gaseous diffusion barrier

摘要

Sensor for measuring the partial pressure of a gas in a gaseous medium, comprising an electrochemical cell (2) and a diffusion barrier comprising a porous membrane (10) situated above an orifice (7) made in a component surmounting a casing (1) enclosing said electrochemical cell (2). It comprises: a cap (3) surmounting said casing (1) including a first component (4) provided with a central recess (5) in the bottom of which said orifice (7) is made, a housing (9) being provided in the bottom (6) of said recess so as to place said porous membrane (10) therein; a second component (11) applying said membrane (10) against the bottom (6) of said housing (9) with a clearance between said second component (11) and the housing (9); and a third component (12) held in said central recess (5) in such a way as to exert on said second component (11) the pressure required for the application of said membrane (10) against the bottom (6) of said recess (9), and comprising at least one orifice (13, 13') permitting the passage of said gaseous medium up to said membrane (10).