Dissolved oxygen probe

Claim 1

A galvanic cell probe submersible in a liquid to continuously analyze the concentration of a gas, such as oxygen, dissolved therein, said probe comprising: A a casing having an open mouth covered by a gas permeable membrane to define a chamber filled with an electrolyte; B a measuring electrode disposed in said chamber with its front face closely adjacent the inner surface of the membrane to create a gap that is occupied by the electrolyte, said measuring electrode having holes therein to form an electrolyte passage between the front face and the rear face of the electrode, said rear face having an insulating layer thereon to prevent a reaction between the rear face and the electrolyte whereby the probe is rendered substantially insensitive to dissolved gas contained in the electrolyte and responds only to dissolved gas contained in the liquid being analyzed, said insulating layer having holes therein all of which being in registration with all of the holes in the measuring electrode on a one-to-one basis; and C a counter-electrode disposed in said chamber whereby the current passing between the measuring electrode and the counter-electrode through said electrolyte as a result of galvanic action is a function of the concentration of dissolved gas in said liquid.