Sensor DetectionCarbon control meters are typically paired with oxygen probes (also known as zirconia oxygen sensors) as the primary carbon potential detection sensors. The oxygen probe operates based on the principle of a concentration cell, generating an electromotive force when there is a difference in oxygen concentration on either side of the zirconia at high temperatures (typically around 900°C for processes like carburization). The carbon potential in the furnace atmosphere is correlated with the oxygen content; as the carbon potential changes within the furnace, the oxygen content also varies accordingly. The oxygen probe can detect this change in oxygen content and output a voltage signal proportional to it. In addition to the oxygen probe, there are infrared gas analyzers and other equipment that can be used to detect the composition of the furnace gas, such as carbon dioxide content. These changes in composition are also related to carbon potential, providing more information for carbon potential control.