基于PIC16F877的新型二线制温度变送器

New Two-Wire Temperature Transducer Based on PIC16F877

本文介绍了一种基于 Microchip的低功耗单片机 PIC16 F877新型智能二线制热电阻 (Pt10 0 0 )温度变送器的电路设计。文章分析了系统设计的理论依据和软硬件实现方案 ,采用温度补偿算法使补偿后的精度等级达到 0 .1% FS。该智能式变送器具有精度高、可靠性好、现场显示 ,生产调试方便等特点 ,是老式二线制温度变送器的理想替代产品 ,具有广泛的应用前景。

A new two wire temperature transducer with heat resistors (Pt1000) based on low power single chip processor PIC16F877 of Microchip is introduced.The theory, software and hardware circuits of system are also analyzed.Using a software algorithm of temperature compensation in practical measurement,the precision degree can arrive 0 1%FS.This device has many advantages such as high accuracy,high reliability,field display,easy debugging and so no.so it is ideal replace product of old two wire temperature transducer,it has a wild application prospect.