SRX-MT22-XL PPM O2 sensor replaces Teledyne B-2CXL PPM oxygen sensor. Extremely smooth surface of sensing cathode produces excellent signal stability and signal to noise ration. SRX-MT22-XL PPM O2 sensor exhibits quick recovery from air to low PPM level, zero offset under 0.2 PPM in zero grade nitrogen. Proprietary electrolyte formulation enhances sensor performance at extreme ends of recommended operating temperature range. Coiled shape anode eliminates the possibility of air bubble entrapment in typical crushed Pb granules anode thus resulting spike free oxygen signal. Sensor is designed, developed and manufactured in the USA.