Synopsis A probe for accurate and rapid determination of Si contents in hot metal has been developed by thermal electromotive force (EMF) measurement. The sensor has a pair of electrodes for measuring thermal EMF, which are housed in a large steel chamber to cool hot metal sample. Measurements are completed in about 1 min after immersion of a few seconds. Laboratory study has been made on the applicability of the sensor to blast furnace hot metal. The adverse effects of hot metal temperature on measurement have been eliminated. It has been confirmed that there is little effect of C and Mn on measurement.
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