AST offers a full line of % O2 sensors for industrial applications, a variety of models are available for low to high level of O2 measurement, including sensors for oxygen purity measurements, sensors with expected sensor life of 2 years in 100% oxygen. Replacement sensors for Teledyne Class B-1, B-3, C-3, A-5, E-2, Analytical Industries GPR-11-32-RTS, GPR-11-60-RTS, GPR-11-120, GPR-11-120-OP, GPR-11-120-RTS, GPR-11-120-4, XLT-11-24