AST SRX-MT22 PPM O2 SensorREPLACEMENT SENSOR FOR Teledyne Model B 2C AII Model PSR 12 223 AMI Model T 2 and GE Model OX 1 AST Model SRX MT22 PPM O2 Sensor is a replacement to Teledyne B2C, AII PSR 12 223, AMI T 2 and GE OX 1 PPM O2 sensors. This PPM O2 sensor can measure oxygen down to 0. 1 PPM level in inert atmosphere. Coiled shape anode eliminates the possibility of air bubble entrapment in typical crushed Pb granules anode thus resulting spike free oxygen signal. Sensor is