AST SRZ-MT12 ..... PPM Oxygen SensorREPLACEMENT SENSOR FOR . Teledyne Model A 2C AII Model XLT 12 123 AMI Model T 4 GE Panametrics Model OX 2 AST Model SRZ MT12 PPM oxygen sensor replacement to Teledyne Model A 2C, Analytical Industries Model XLT 12 123, AMI ModelT 4 and GE Model OX 2 PPM oxygen sensors. Its proprietary electrolyte formulation offers excellent compatibility with sample gas containing acid gases such as CO2, traces levels of H2S and SO2. Sensor is designed, developed and