| 摘要 |
<p>An improved sensor for dissolved oxygen measurement comprising a body (12) having an electrolyte reservoir (14) and electrolyte (17) contained therein and an opening (16) for communication between the exterior of the body and the reservoir and an anode (22) and cathode (24) concentrically disposed in the body adjacent the opening. A thin polymeric membrane (18) permeable to oxygen seals the opening. The working surfaces (30) of the anode and cathode, that is the surfaces adjacent the membrane, are spaced apart from the membrane to define an electrolyte space (46) between the working surfaces and the membrane. A noble metal screen (48) is disposed on the working surface of the anode. Preferably the screen completely covers the anode working surface and a portion of the screen which would normally overlie the working surface of the cathode is cut away so that the cathode working surface is unobstructed. The noble metal screen over the anode surface results in substantial retention of electrode stability over a period of time as compared to sensors similarly constructed but which do not include the noble metal screen over the anode working surface.</p> |
