IC697MDL241 GE 特价销售

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④薄膜式热电偶：用真空蒸镀的方法，将热电极沉积在绝缘基板上而成的热电偶。这种热电偶可以做得很薄，而且尺寸可做得很小。它的特点是热容量小，响应速度快，适用于测量微小面积上的瞬变温度。
⑤ 快速消耗型热电偶 这是一种专为测量钢水及熔融金属温度而设计的特殊热电偶。热电极是由直径为0.05-0.1㎜的铂铑10-铂铑30等材料制成，且装在外径为1㎜的U型石英管内，构成测温的敏感元件。特点：当其插入钢水后，保护帽瞬即熔化，热电偶工作端立刻暴露于钢水中，由于石英管和热电偶的热容量都很小，因此能很快反应出钢水的温度，反应时间一般为4-6秒。在测出温度后，热电偶和石英保护管都被烧坏，因此它只能一次性适用。
Ⅴ、热电偶冷端的温度补偿
   由于热电偶的材料一般都比较贵重，而测量点到仪表的距离都很远，为了节省热电偶材料，降低成本，通常采用补偿导线把热电偶的冷端（自由端）延伸到温度比较稳定的控制室内，连接到仪表端子上。必须指出，热电偶补偿导线的作用只起延长热电极，使热电偶的冷端移动到控制室的仪表端子上，它本身并不能消除冷端温度变化对测温的影响，不起补偿作用。因此，还需要采用其他修正方法来补偿冷端温度不等于0℃时对测温的影响。
       在使用热电偶补偿导线时必须注意型号相配，极性不能接错，补偿导线与热电偶连接端的温度不能超过100℃。