AST Model SRX-CT-KE4 Oxygen Sensor replaces PSR-11-75-KE4 and MAX-250K O2 sensor. This sensor is specifically designed for breathing air equipment such as ventilators. AST utilizes innovative design with proprietary Pb anode structure
that provides with excellent stability and ensures full utilization of the anode without signal drift thus minimizing periodic calibration requirement. AST sensor is designed, developed and manufactured in the
USA.