MgO-C continuous temperature-measuring sensors for liquid steel were made of fused magnesia with different critical particle sizes from 05 to 20 mm, thus the effects what magnesia′s particle size affect sensors′ properties and lifetime were studied. The result shows that the MgO-C continuous temperature-measuring sensor has good aggression resistance to basic tundish powders and meets the requirement for response time of temperature measuring practice in tundish. The sensor′s service life, which is affected by multi-properties of material and operating environment, reached its maximum when the critical particle size of magnesia was 10 mm. The average lifetime of sensors was 43 or 40 h when served for casting SPHC or Q195 steel.
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