An air/fuel ratio detector comprising a pump and an electrochemical cell in which both the pump and electrochemical cell comprise an oxygen ion conductive solid electrolyte sandwiched between porous electrodes. One of the elements has an insulating substrate formed on a portion of the electrolyte. Over...http://www.google.es/patents/USH427?utm_source=gb-gplus-sharePatente USH427 - Air/fuel ratio detector
