SRX-CA120-4 Oxygen Sensor is designed for oxygen purity analysis, it is a galvanic type micro fuel cell specific to oxygen and is a drop-in replacement to GPR-11-120-4 O2 sensor for GPR-2500, GPR-3100 analyzers. Expected sensor life in 100% oxygen is 24 months. Its unique anode structure provides with excellent signal stability at elevated oxygen levels, it is an excellent choice for measuring up to 100% oxygen. Sensor is designed, developed and manufactured in the USA.