Model SRX-CA60 % Oxygen Sensor is a direct replacement for Analytical Industries GPR-11-60 % oxygen sensor. This sensor is used in GPR-25oo, GPR-2600 andGPR-28 analyzers. It is a galvanic type micro fuel cell specific to oxygen. This sensor has same characteristics, in terms of response and signal output, as SRX-CA32 and GPR-11-32 but offers 60 months operating life in air under ambient temperature and pressure. AST brand sensors are designed, developed and manufactured in the USA.