我们在生产实践中感到用幅射高温计对高温盐浴炉测温存在不少问题。后来改用石英管做保护套管,用铂铑-铂热电偶配电子电位差计来测量、控制,石英管也存在一些问题,以致损坏热电偶,现在我们改用硼化锆材料做保护套管,已使用九个月(我厂高温炉不经常开炉,九个月中使用十几次),套管表面无腐蚀,内部无渗透,热电偶完好无损。这种套管的膨胀系数很小, We feel in the production practice using the radiation pyrometer temperature salt bath temperature there are many problems. Later switched to the use of quartz tube protection tube, with platinum and rhodium - platinum thermocouple with electronic potentiometer to measure, control, there are some problems quartz tube, so that the damage to the thermocouple, and now we use zirconium oxide material instead of protective sleeve Tube, has been used for nine months (my factory furnace is not often open furnace, a dozen times in nine months), casing surface corrosion, no internal penetration, thermocouple intact. The expansion coefficient of this sleeve is very small,