In our plant thermocouple sensor are transferring mv to marshaling cabinet. Then a transmitter barrier change it to 4-20 and goes to control station. My question is it possible to change mv signal of sensor to 4-20 via transmitter in site near furnaces in Olefin plant to than transfer 4-20 to marshaling cabinet? This cause that we do not use thermocouple cable and instead use is cable which decreases cost but what about standards? Is there any standard that tell us to apply this method instead of 4-20?
Appreciate your help.
Appreciate your help.