![]() ![]() This particular setup can be used in situations where it is not practical to supply separate power to all of the devices or in hazardous areas where a low power solution is required. These devices are referred to as loop-powered. It is possible, however, to power all the instruments on the loop with the power supplied for the loop itself. A lot of loop setups will utilize an external power supply in order to power the devices which are attached to the current loop. ![]() Recalling from the previous part of this series, the Fundamentals of 4-20 mA Current Loops, all 4-20 mA current loops require a power supply in order to operate.
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