Four-wire transmitter wiring method

How to wire a four-wire transmitter? Due to the popularization and application of the 4-20mADC (1-5VDC) signal system, in order to facilitate the connection in the control system application, the unification of the signal system is required. For this reason, some non-electric unit combination instruments are required, such as online analysis, mechanical quantity, Electricity and other instruments can use the output signal system of 4-20mA, but due to the complex conversion circuit and high power consumption, it is difficult to fully meet the above three conditions, and the two-wire system cannot be achieved, so an external power supply can only be used. The method is to make a four-wire transmitter with an output of 4-20mADC. Four-wire transmitter wiring diagram The four-wire transmitter is shown in the figure. Most of its power supplies are 220VAC, and some are 24VDC. The output signal is 4-20mADC, the load resistance is 250Ω, or 0-10mADC, the load resistance is 0-1.5kΩ; some also have mA and mV signals, but the load resistance or input resistance varies depending on the form of the output circuit. different.