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technical article
Causes and solutions of thermocouple leakage
2011-10-8 15:20:16

     是一端结合在一起的一对不同材料的导体,应用 它的 热电效应实现温度测量的敏感元件。 A thermocouple is a pair of conductors of different materials bonded together at one end . The thermoelectric effect of the thermocouple is a sensitive element for temperature measurement. 是温度测量仪表中常用的测温元件,它 可以 直接测量温度。 Thermocouple is a commonly used temperature measuring element in temperature measuring instruments, which can directly measure temperature.

     随着 现代 化工、冶金、石油、机械等 行业 的飞速发展, 一些 高精度、高灵敏度的仪表被 越来越多的 广泛使用 With the rapid development of modern industry, metallurgy, petroleum, machinery and other industries , some high-precision, high-sensitivity instruments are more and more widely used . 仪表 抗干扰问题成为不可忽略的问题, 尤其 是工业电炉、硅碳棒电炉、盐浴炉等所产生的干扰 比较 大, 容易 造成仪表工作 不正常,误差 增大,不稳定,指示速度减慢等等。 The problem of anti-interference of the meter has become a problem that cannot be ignored, especially the interference caused by industrial electric furnaces, silicon carbon rod electric furnaces, salt bath furnaces, etc. , which may cause the meter to work abnormally, the error value will increase, and the indicator will be unstable. Slow down and more. 必须 得以解决,否则不能保证产品质量, 容易 造成损失。 These problems must be solved, otherwise the product quality cannot be guaranteed and it is easy to cause losses.

     漏电的原因 有以下几点 The reasons for thermocouple leakage are as follows :
耐火砖在高温下绝缘 情况 ,在装有炉丝的炉壁上插入带 金属管的热电偶容易使炉丝与热电偶接触, 一般情况下 耐火砖在室温下是良好的绝缘 料,但 随着温度 的不断 上升,绝缘性能 会显著下降。 (1) The refractory bricks on the electric furnace are not well insulated at high temperatures. Inserting a thermocouple with a metal tube on the furnace wall equipped with the furnace wire makes it easy for the furnace wire to contact the thermocouple. Generally, the refractory bricks are at room temperature. Is a good insulating material , but as the temperature continues to rise, the insulation performance will also significantly decrease. 的是 氧化铝耐火砖,随温度上升其电阻值也显著降低。 Most of the furnace linings of electric resistance furnaces are made of alumina refractory bricks, and their resistance value decreases significantly with increasing temperature.

   保护管是氧化铝瓷管,偶丝用瓷管穿上作 分离绝缘, 在高温下绝缘性能也 要降低,造成漏电,最后泄露到热电偶处 的时候 ,这 热电偶上就有交流漏电信号。 (2) The contact between the furnace wire and the thermocouple. The protective tube of the platinum and rhodium thermocouple is an alumina ceramic tube. The couple wire is worn with a ceramic tube as separate insulation, but the insulation performance will also be reduced at high temperatures , causing leakage. When it finally leaks to the thermocouple, an AC leakage signal is present on the thermocouple.

    热电偶 漏电的方法 如下 The method to solve the thermocouple leakage is as follows :
接触。 (1) Keep the thermocouple out of contact with the refractory brick .
接地 ,消除热电偶上的漏电信号。 (2) Connect the negative terminal of the thermocouple to the ground to eliminate the leakage signal on the thermocouple.
输出端加装滤波装置。 (3) Install a filtering device at the output of the thermocouple .
接地 (4) Lead the ground wire from the thermal contact of the thermocouple to the ground .
它接地。 (5) Add a heat-resistant steel tube or silicon carbide tube to the thermocouple tube and ground it.