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高温盐浴炉的工作温度一般约在1200℃～1300℃。通常将铂铑——铂热电偶直接插入炉中进行测温,并以高温瓷管作为热电偶的保护管。如果保护管未作充分预热,往往会发生瓷管爆裂从而损坏热电极。分级预热大致可分以下两个阶段进行: 1.将热电偶置于小箱式炉内,从室温开始随炉升温至650℃左右,保温时间不少于20分钟。 2.待保护管均匀受热后,放入中温盐浴(800℃)中预热15分钟,然后再插入高温盐炉(炉温以1000℃以下为宜)直至升温至正常工作温度。工作结束后,热电偶应随炉冷却,建议最好按照预热时的逆过程缓慢冷却至室温后,用
High temperature salt bath operating temperature is generally about 1200 ℃ ~ 1300 ℃. Usually platinum rhodium - platinum thermocouple directly into the furnace for temperature measurement, and high temperature porcelain as a thermocouple protection tube. If the protective tube is not fully preheated, porcelain tubes tend to burst and damage the thermode. Grading preheating can be roughly divided into the following two stages: 1. The thermocouple placed in a small box furnace, starting from room temperature with the furnace temperature to about 650 ℃, holding time of not less than 20 minutes. 2. To be protected tube evenly heated, into the temperature salt bath (800 ℃) for 15 minutes, then insert the high temperature salt furnace (furnace temperature to 1000 ℃ the following appropriate) until the temperature to normal operating temperature. After the work, the thermocouple should be with the furnace cooling, it is recommended that the best in accordance with the inverse process of preheating slowly cooled to room temperature, with