SRZ-MA100-M PPM Oxygen Sensor is a drop in replacement to AII Model XLT-12-100-M O2 sensor. This sensor is recommended for gas streams containing reactive gases such as CO2. Its innovative design with electro-etched sensing cathode provides with extremely smooth sensing surface for excellent signal stability, very low noise and drift. Sensor uses proprietary electrolyte formulation that makes it compatible with gas mixture containing CO2 and enhances sensor performance at extreme ends of recommended operating temperature range. Sensor is designed, developed and manufactured in the USA.