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Carbon controlling with O2-probe and L-probe
Gas carburizing still plays an important role in heat treatment. Temperature and carbon potential (C-Potential) of the atmosphere are the essential parameters for the process control. Till this day there is no direct measurement method for C-Potential which could be used for online process control. The measurement of the oxygen partial pressure in the furnace atmosphere is the most used indirect method for the control of the C-Potential.
Reference measurements in gas carburizing atmospheres: part 1
The most important parameters for the control of carburizing processes are the temperature and the C-potential of the atmosphere. Temperature is normally measured by means of thermocouples. For the control of C-potential the measurement of oxygen partial pressure of the furnace atmosphere by in-situ O2-probes and Lambda probes (L-probes) became accepted. The thermocouples as well as the probes for measurement of residual oxygen gradually lose in accuracy
Reference measurements in gas carburizing atmospheres: part 2
The most important parameters for
the control of the carburizing process are temperature and carbon potential (C-potential) of the atmosphere. To achieve accurate and reproducible results these parameters must be measured as accurately as possible. Due to aging and other possible sources of error the thermocouples and O2-probes as well as L-probes used for this purpose, over time, provide inaccurate or false readings . Therefore, reference measurements are essential in order to correct the results accordingly.