热电偶温度测量系统中电磁继电器的影响分析  

Influence analysis of electromagnetic relay in thermocouple temperature measuring system

作　　者：陈栩颖 倪伟 CHEN Xuying;NI Wei(Shanghai Highly Electrical Appliances Co.,Ltd.,Shanghai 201206)

机构地区：[1]上海海立电器有限公司,上海201206

出　　处：《家电科技》2022年第1期116-121,共6页Journal of Appliance Science & Technology

摘　　要：热电偶是一种价格低、方便使用的温度传感器。在综合性的检测设备中部分对测试精度要求不高的温度测量,通常会选用热电偶作为传感器。热电偶通常与延长线及显示仪表共同组成一组测量系统。为降低成本及柜体安装设计,有时需引入继电器实现分别测量的目的。测量系统中增加电器元件将对测量精度和不确定度产生影响。研究分析了热电偶温度测量的原理以及继电器结构工作的原理。分析在热电偶测量系统中增加电磁继电器,对信号调理电路的设计产生的影响,并通过试验验证不同方案电路设计对测量系统不确定度的影响,给出一套适宜的电路设计方案。试验结果表明:测量系统中无继电器接入和测量系统中接入1个继电器常开触点两种方案,测量不确定度U<1℃。本次研究给后续的热电偶测量系统的设计提供参考意见。The thermocouple is a low-cost, sturdy and durable temperature sensor. In the comprehensive testing equipment part of the temperature measurement that does not require high test accuracy, thermocouples are usually used as sensors. Thermocouples are usually combined with extension cords and display instruments to form a set of measurement systems. In order to reduce the cost and cabinet installation design, sometimes it is necessary to introduce a relay to achieve the purpose of separate measurement. The addition of electrical components to the measurement system will affect the measurement accuracy and uncertainty. Analyze the principle of thermocouple temperature measurement and the working principle of relay structure. Analyze the influence of adding an electromagnetic relay in the thermocouple measurement system on the design of the signal conditioning circuit, and verify the influence of different circuit designs on the uncertainty of the measurement system through experiments, and give a set of suitable circuit design schemes. The test results show that there are two schemes: no relay connection in the measurement system and 1 relay normally open contact in the measurement system, and the measurement uncertainty is U<1℃. This research provides reference for the design of the subsequent thermocouple measurement system.

关 键 词：热电偶 电磁继电器 测量不确定度 

分 类 号：TH-39[机械工程]