Dear All

An instrumentation issue -

A machine is utilising three 4 to 20ma pressure transmitters for control
purposes. They are all on different circuits which have their own supplies.

For certain reasons it has become desirble to have just one transmitter
perform the function of all three (same pressure being measured) - how can
this be acheived? A spliter has been tried and whilst this did indeed
generate three signals from one instrument (the original and two additional
outputs) it could not be connected into the existing installation - for each
circuit a loop was required and it's own voltage was present, whereas the
splitter generated its own power etc.

Is there a method or device that can do this?

Any advice is greatly apprecited.

Thanks in advance

Steve