AST-60D % oxygen sensor, a galvanic type micro fuel cell specific to oxygen, is a drop-in replacement to AII-11-60-IND, AII-11-60-HC and AII-11-60-D oxygen sensor. This sensor is used in AII-2000A, AII-2000M and AII-3000 oxygen analyzers. At ambient temperature and pressure, expected sensor life is 60 moths. Its innovative design with proprietary Pb anode structure provides with excellent stability and ensures full utilization of the anode without signal drift thus minimizing frequent periodic calibration requirement. AST brand sensors are designed, developed and manufactured in the USA.