: pp. 25-29
SPC Kharkiv-Prylad Ltd, Ukraine,

Two main methods of contact measurement of steel temperature are applied in industry: with help of disposable  and multiple  used  thermotransducers.  Reusable  ones  are  fixed  to  the  bottom  of  the  graphite  tip  fixed directly on the reinforcement. Then they are able to measure the temperature of the graphite surface. Since it needs to even the graphite temperature and the temperature of the melt metal, the measuring takes some extra time. Therefore the  thermotransducer  is mounted  in  the metal  for a  long  time. Disposable  thermotransducers are placed  in a quartz cylinder, which prevents the premature destruction of it. They are equipped with a thin protective metal tip that melts when  the  thermotransducer  is penetrating  the  slag  layer. So  further  the  thermotransducer contacts directly with  the melt metal as  far as  the completion of  temperature measurement or destruction of  the used measurement unit. The author suggests considering both these methods and tries to apply them within proposed pyrometric method.

The  first method  is based on measuring of  the surface  temperature of  the graphite  tip  in a closed space. The second one consists in measuring the temperature of melt metal that can contact with measuring unit (sensitive part of construction) after the destruction of  the protective cap. The advantages of  the  first method are  that  the same probe can be used multiple  times,  in  fact until complete destruction. The advantages of  the  second method consist  in  the direct optical contact between the metal surface and the pyrometer.

The  considered  method  is  promising  since  it  gives  the  possibility  of  contactless  measurements  of  the temperature  of melt metal within  blast  furnaces  as  well  as  lowering  the  cost  of  the measurement  process  at  the metallurgy. In addition, the research envisages that the implementation of this method anticipates the subsystem  for the removal of vapors from the closed protective cover that significantly affect the measurement results.

[1]  O.  Gerashchenko,  A.  Gordov  etc.  Temperature measurements, Kyiv, Ukraine: Science thought, 1989. 

[2] S.Yatsyshyn, B. Stadnyk, Ya. Lutsyk, L.Bunyak. Handbook of Thermometry and Nanothermometry, Barcelona, Spane: IFSA Publishing, 2015.

[3]  S.  Yatsyshyn,  B.  Stadnyk,  Ya.  Lutsyk,  “Research  in Nanothermometry.  Part 1. Temperature  of Micro-  and Nanosized objects”, Sensors & Transducers, vol. 140, is. 5, p. 1–7, 2012.