基于LabVIEW的PID多点精确控温系统的设计

Design of PID Accurate Multipoint Temperature Control System Based on LabVIEW

基于虚拟仪器软件LabVIEW设计了一套多点精确控温系统。利用LabVIEW软件编写的测温和PID控温程序配合网络数据采集卡、固态继电器等硬件,可以实现对加热装置的多点精确测温和控温。该系统使用的B型热电偶的测温精度能达到0. 1℃。在800～1 800℃高温范围内,系统长时间定点控温波动能稳定在±0.5℃之内。采用星型结构的局域网可将设计的控温系统扩充至4047个测温节点和2024个控温节点,成为一个大型的测温控温系统。

Based on the virtual instrument software LabVIEW,a multi-point precise temperature control system was designed.The accurate temperature measurement and PID temperature control program written by LabVIEW software combined with hardware such as network data acquisition card and solid state relay,it can realize precise temperature measurement and temperature control of the heating device.The temperature measurement accuracy of the B-type thermocouple used in the system can reach 0.1℃.In the high temperature range of 800~1 800℃,the system can stabilize the temperature fluctuation within±0.5℃for a long time.The star-shaped LAN can expand the designed temperature control system to 4 047 temperature measurement nodes and 2 024 temperature control nodes,becoming a large temperature measurement and t temperature control system.