HK模块在两线制及HART隔离传输中的应用

Application of HK Module to Two-Wire System and HART Isolating Transmission

两线制信号及HART传输应用中,因接地回路问题,不同的地电势产生回路电流从而引入共模干扰,产生(4-20)mA信号的传输误差,或造成HART通讯的中断等,更有甚者造成设备端口器件损坏。使用有效的电气隔离方法,形成两线制信号及HART的隔离传输应用,解决上述所述问题,提高系统可靠性。

In the application of two-wire signal and HART transmission, different earth potentials producing loop current introduce common-mode interference because of ground loop problem, and causing a transmission error of signal from 4-20 mA. It may also cause HART communication to suspend and even worse it will damage the port devices of the equipments. By applying effective electric isolation, forming two-wire signal and HART isolating transmission, problems above could be solved to improve the reliability of the system.