Two 4-20mA signals from a single 4-20mA signal

Any signal isolator will do that for you.

If both your devices are referenced to ground it's not possible to connect them in series without an isolator however sometimes one or the other has the option of current or voltage input. In this case wire the current input instrument into the loop then removing the 250 Ohm resistor from the second input and wire it in parallel with the first.

Roy
 
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