For the isolation of the transmitter in another way, the sensor and transmitter as a whole and must be placed in the designated on-site locations. General isolation terminal placement in the central control room cabinet, the cabinet isolation terminal distribution for on-site transmitter power. Figure 4 shows the wiring diagram for the different interfaces of the two products. According to the PLC interface situation to decide which one to use.
 
Site commissioning will not match the instrumentation and PLC interface, the sending device for four-wire transmitter output 4 ~ 20mA, while the receiving end of 4 ~ 20mA interface for second-line circuit power supply (Figure 5-24V power supply and RL way) directly connected will cause the power conflict. The solution is the scene of the isolated terminal 4 ~ 20mA receive and install a dedicated circuit isolation, internal output section of the isolated terminal to match the PLC's second-tier circuit power supply interfaces.

To determine the function, the front-end interface to adaptation to select the isolation terminal, still accurate, power consumption, noise, dielectric strength, bus communication functions of many parameters requires users to carefully choose.