Patent ID: 8888978

Claim:
An apparatus comprising: an electrochemical oxygen sensor, the electrochemical sensor further comprising: a housing having first and second compartments; a sensing electrode disposed within the first compartment of the housing; a consumable anode disposed within the second compartment of the housing; a porous separator between the sensing electrode and consumable anode that separates the first and second compartments; an electrolyte saturating the porous separator and consumable anode; a first aperture on a first end of the housing extending between an outside surface of the housing and first compartment that allows gas access to the sensing electrode; and a venting system on a second, opposing end of the housing including a second aperture extending between the outside surface of the housing and second compartment and having a predetermined permeability that controls pressure in the second compartment and loss of moisture from the sensor, wherein the predetermined permeability further comprises a range of 2000 to 6000 Gurley seconds.