Study on the principle of 4-20mA current loop In industrial sites, using an instrument amplifier to complete signal conditioning and long-distance transmission will cause the following problems: First, since the transmitted signal is a voltage signal, the transmission line will be interfered by noise; second, the distributed resistance of the transmission line will cause voltage drop; third, how to provide the working voltage of the instrument amplifier on site is also a problem. In order to solve the above problems and avoid the influence of related noise, we use current to transmit signals because current is not sensitive to noise. The 4-20mA current loop uses 4mA to represent the zero signal and 20mA to represent the full scale of the signal, and signals below 4mA and above 20mA are used for various fault alarms.
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