SRZ-MA333-M PPM Oxygen Sensor is a galvanic type micro fuel cell specific to oxygen replacement to XLT-12-333-M sensor. Recommended for measuring oxygen in inert and gaseous hydrocarbon mixtures. With extremely smooth sensing surface provides excellent signal stability, very low noise and drift. The proprietary electrolyte formulation used in this sensor makes it compatible with gases containing any level of CO2 gas and enhances sensor performance at extreme ends of recommended operating temperature range. Sensor is designed, developed and manufactured in the USA.