采用 3 线制技术的压力传感器至少配有三根连接线：除了一根用于电压供应的负极线和一根用于输出信号的正极线(两者也用于 2 线制技术中)之外，这些传感器还具有第三根电源线。

　　原文：

　　A pressure sensor in 3-wire technology comes with at least three connecting wires: In addition to a negative wire for the voltage supply and a positive one for the output signal, both of which are also used in 2-wire technology, these sensors feature a third wire for power supply.