mechanical behaviour of ceramic oxygen sensors has been achieved. The results are compared with practical performance Using a previously established non-stationary under industrial conditions. With the help of the model, it thermal model it is possible to calculate the is possible, for example, to modulate the thickness of the distribution of temperature and thermal stresses in electrolytic material depending on the immersion time of emf sensors based on stabilised ZrO 2 which are the sensor. frequently applied for the measurement of oxygen activity in steel melts. The model may provide a THEORETICAL BASIS OF THERMAL SENSOR basis for optimised construction of these sensors.MODEL The preheating behaviour is in the first step characterised for the sensor itself and in the second First, the equations necessary for the understanding of the step for the complete one-reading measuring model are presented. Temperature distribution in the sensor device.I&S/1738 is dependent on the geometry and material of the sensor and on time. It can be described by the following FourierThe authors are in the Institute of Iron and Steel Technology, diVerential equation
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