高性能温度量输入信号转换模块开发与测试研究  

Development and Testing Research on High- Performance Temperature Input Signal Conversion Module

作　　者：陈建军 方袭 许敏 CHEN Jianjun;FANG Xi;XU Min(Shanghai Chenzhu Instrument Co.,Ltd.,Shanghai 201612,China)

机构地区：[1]上海辰竹仪表有限公司,上海201612

出　　处：《自动化仪表》2022年第9期95-99,105,共6页Process Automation Instrumentation

摘　　要：温度量输入信号转换模块在温度测量控制系统中的应用十分广泛,其性能和可靠性对保障生产安全十分重要。为了满足更高的应用要求,设计了一种高性能温度量输入信号转换模块。基于单片机技术和热电阻、热电偶测温原理,模块集成了本安防爆技术、功能安全设计技术和电磁兼容设计技术。模块具有本安防爆功能和传感器故障在线诊断功能,准确度高、环境适应性好、抗干扰能力强、可靠性高,具有广阔的应用前景。为了提高模块的标定和测试精度,基于四线制电阻测量原理,设计了一种用于校验仪模拟电阻输出端口的测试线插头方案,避免了常规插头与校验仪输出端口之间接触电阻的影响,在生产标定和测试试验中有较高的实用价值。The temperature input signal conversion module is widely used in temperature measurement and control systems, and its performance and reliability are very important to ensure production safety. To meet the higher application requirements, a high-performance temperature quantity input signal conversion module is designed. Based on microcontroller technology and thermal resister and thermocouple temperature measurement principle, the module integrates the intrinsically safe and explosion-proof technology, functional safety design technology and electromagnetic compatibility design technology. The module has intrinsically safe and explosion-proof function and sensor fault online diagnosis function, high accuracy, good environmental adaptability, strong anti-interference ability and high reliability, and has a broad application prospect. To improve the calibration and testing accuracy of the module, based on the four-wire resistance measurement principle, a test line plug scheme for the analog resistance output port of the calibrator is designed, which avoids the effect of contact resistance between the conventional plug and the output port of the calibrator and has high practical value in production calibration and test trials.

关 键 词：防爆 热电阻 热电偶 可靠性 测量不确定度 在线诊断 电磁兼容 环境适应性 

分 类 号：TH-86[机械工程]