During calcining of ceramics the oxygen portion of the fuel gas is an important parameter. In the range of excess air this is self-explanatory.
In the range of deficient air, i.e. in the range which is characterized by the CO/CO2 ratio, it is elegant to control the so-called lambda value by an oxygen measurement.
The measuring device GSM as installation variant with connection to an external sensor. According to practical use, there has to be connected an extractive sensor or an inline sensor.