加热炉热电偶案例分析与探讨  

Analysis and Discussion of Thermocouple Cases in Heating Furnace

作　　者：王传华 WANG Chuanhua(Taixing Shengke Chemical Co.,Ltd.,Taixing 225300,China)

机构地区：[1]泰兴市昇科化工有限公司,江苏泰兴225300

出　　处：《化工管理》2023年第33期111-113,143,共4页Chemical Engineering Management

摘　　要：热电偶的快速响应特性使其在工业过程测量中有非常广泛的应用,然而由于毫伏信号的传输存在易受干扰影响的性质,在实际使用中经常遇到干扰的问题。文章就加热炉热电偶使用中的故障案例,讨论了热电偶的测量原理,测量回路以及屏蔽层的干扰问题,针对该案例中的故障找到了产生的原因,即电缆屏蔽层的腐蚀以及虚接。之后提出了解决方法,优化屏蔽层接线形式,并对屏蔽层实施保护性措施。该处理方法在后续的生产实践中得到了验证,大大降低了加热炉热电偶的故障率。the rapid response characteristic of thermocouple makes it widely used in industrial process measurement.However,the transmission of millivolt signal is susceptible to interference,in the actual use of frequent interference problems.In this paper,the measuring principle of thermocouple,the interference of measuring circuit and shielding layer are discussed,the causes of the faults in this case are found:corrosion of the cable shielding layer and virtual connection.The solution is to optimize the wiring form of the shielding layer and carry out protective measures for the shielding layer.The treatment method has been verified in the following production practice,and the failure rate of heating furnace thermocouple has been greatly reduced.

关 键 词：加热炉 热电偶 抗干扰 屏蔽线 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]