Remote multi-point temperature control system,remote temperature sensing and transmission has been a problem,and the result is not satisfactory temperature control.This paper took AD590 constant current source temperature sensor as the core,designed a circuit for remote temperature sensing and transmission.It combinated PLC,configuration screen,inverter,and the A/D,D/A module,built an easy to operate,stable operation of the closed-loop PID Temperature regulation system.The tests show that the system design of remote temperature sensing and transmission circuit,it has the advantages of stable high detection accuracy and reliable transmission.PID closed-loop thermostatically controlled system is built,it is adjusted fast,and operates smoothly.%远程多点温度控制系统中,远程温度检测与传输一直是个难题,而且温度控制效果不理想.文中以AD590恒流源温度传感器为核心,设计了适合远程温度检测与传输的电路.用组合PLC、组态屏、变频器以及A/D、D/A模块等,构建1个操作方便、运行稳定的闭环PID恒温调节系统.试验表明:设计的远程温度检测与传输电路精度高、传输可靠；构建的PID闭环恒温调节系统调节速度快、系统运行平稳.
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