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4-20mA transmitter with sense on the high side

Question asked by vpmeister on Apr 25, 2013
Latest reply on Apr 26, 2013 by tjohnson

I am trying to work out if the circuit required to control the current in a 4-20 mA loop is different than the ones that show RL on the low side of the loop power.  It seems that loop sourcing circuits can "steal" extra current as long as they return the right amount to the loop to go across the external RL. But when RL is on the high side, that does not work.  I have attached a PDF with my understanding of the situation and wonder if there are any parts I should be looking at using.

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