Oxygen sensor Oxygen sensor is a kind of metallurgy detection probe which is designed to measure the oxygen content and temperature of the molten steel fast, accurately and directly. 1. Application: used for primary melting furnace, lf and rh furnaces and so on, oxygen probes measure oxygen activity of the molten steel and the oxygen activity of the molten steel in the treating process, which can guarantee the deoxidizer addition, shorten the refining time, help to develop new varieties, improve technology, and promote steel purity. 2. Main features and range of application: Oxygen sensor has three types: 1)oxygen sensor for high ppm 2)oxygen sensor for low ppm . 3)oxygen sensor for ultra-low ppm.