APPARATUS FOR CONTINUOUSLY MEASURING QUANTITY OF DISSOLVED OXYGEN IN MOLTEN STEEL

摘要

PURPOSE:To make it possible to stably, accurately and continuously measure the quantity of dissolved oxygen, by electrically connecting a standard electrode to molten steel through a slab or a casting apparatus member. CONSTITUTION:An oxygen probe 16 is constituted of the zirconia cell 1 and standard electrode 2 mounted to a floating block 15 and a potentiometer 6 is provided on a lead wire 5 connected to the standard electrode 2 at one end and connected to a roller apron frame 12 at the other end and measures potential difference between the standard electrode 2 and the frame 12. An oxygen concn. converting apparatus 21 receives the output signal of the potentiometer 6 to calculate the concn. of oxygen. Because thermoelectromotive force generated by the connection between a different kind of metals is contained in the output of the potentiometer 6, the apparatus 21 has an electromotive force correction circuit 22 removing the effect of thermoelectromotive force and the output signal based on the correction value thereof is outputted to an oxygen concn. converting circuit 23. In order to remove the effect of noise caused by the earth of a casting apparatus, a noise correction circuit 25 is provided.