AST Model SRX-CTE2 % Oxygen Sensor replaces Teledyne Class E-2, Part Number C57283-E2 % oxygen sensor. This sensor is designed for industrial gas analysis and for simplicity, can be mounted directly into sensor housing with M16x1mm thread. Sensor signal is in uA and is uncompensated. SRX-CTE2 oxygen sensor is typically used in Teledyne Model 3290 analyzer. Proprietary electrolyte formulation ensures full utilization of Pb anode, thus providing longer life without signal drift and minimizing periodic calibration requirement. Sensor is designed, developed and manufactured in the USA.