Selective sensor construction

摘要

A sterilizable electrode employs a selectively permeable membrane bonded at its edges to a face of a cover member. An opening or hole in the cover permits contact between the membrane and a material whose composition is to be tested. The cover and membrane assembly are removably attached to an electrolyte filled sensor body which also houses an electrode. The electrode is arranged to bear against the membrane to force the latter to bulge into the hole of the cover. In a dissolved oxygen sensor embodiment the electrode is a body of silver connected to a silver wire which extends through an inert, insulating sheath. The sheath is contained within a stainless steel shield which serves as the electrical conductor to, and a supporting structure for, a lead anode.