Why

Fundamentals of 4-20 mA Current Loops

Fundamental of 4-20 mA Current Loops In process control, there are different types of infinite process inputs. Thermocouples and RTDs provide direct temperature reading while digital signals such as Modbus   provide exacting control over process variables and display. Analog signals, where information about the process is transmitted via varying amounts of voltage or current, are …

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Why 4 to 20 mA used?

Following are the reasons Why 4 to 20 mA used?​:- Current signals are often used in sensors because the current response is usually more linear than the voltage response. Current signals also typically provide a low impedance for sensors, with the benefit of better immunity to noise. Current signals can extend much further than voltage …

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