Patent ID: 8252158

Claim:
An electrochemical gas sensor comprising: a body having first and second chambers located inside the body separated by an opening that is also located inside the body; a working electrode disposed within one of the chambers; and a sealing member disposed over the opening between the first and second chambers, the sealing member, in turn, having at least one opening therethrough and an overlying micro-porous membrane carried therein to minimize temperature based shocks, said micro-porous membrane allowing electrolyte ions to pass through the micro-porous membrane and preventing the bulk transport of gas and exchange of air between the first and second chambers, said micro-porous membrane holding liquid in the pores of the micro-porous membrane by surface tension and capillary action and wherein pressure must be applied across the micro-porous membrane between the first and second chambers to overcome the surface tension and the capillary action before gas is able to cross the sealing member between the first and second chambers, the micro-porous membrane having a bubble point pressure of at least 0.13 bar.