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4-20 mA Current Loops Overview. The 4-20 mA current loop is the prevailing process control signal in many industries. It is an ideal method of transferring process information because current does not change as it travels from transmitter to receiver. It is also much simpler and cost effective.
This paper provides practical guidelines on when and how to introduce signal isolation into 4-20mA loops without affecting loop integrity. What is the problem? A ubiquitous problem with plant is the interface of every industrial plant measurement signals to the monitoring and control systems.
Burr-Brown now offers all of the integrated circuit building blocks needed to assemble com-plete isolated 4-20mA current-loop systems. The product line includes two-wire transmitters, two-wire receivers, low cost isolation amplifiers, and low cost isolation power sup-plies.
A handy guide to understand 4-20 mA current loop configurations (2- and 3-wire), how to make measurements from them, and potential pitfalls.
2 gru 2020 · Another way is to use a loop isolator module. These devices utilize various methods to achieve galvanic isolation, typically using transformers or optical couplers. They accept a 4-20 mA signal, function as a repeater or re-transmitter, and deliver a reconstituted 4-20 mA current loop signal that is fully isolated.
16 wrz 2022 · I have a PLC that is powered with 3.3 V and a sensor powered with 12 V that outputs a 4-20 mA signal. In order to allow the signal to be readable by my PLC while isolating the current in the 12 V loop from the 3.3 V loop I need to use an opto-isolator which I have never used before.
20 kwi 2021 · Another method to provide separation is to add a loop isolator. This device accepts a 4-20 mA signal, functions as a repeater or re-transmitter, and delivers a reconstituted 4-20 mA current loop signal that is fully isolated.
