Tag Archives: HART

Basic concept of HART

Looking at a standard loop-powered (2-wire) process transmitter circuit, we see the transmitter, a DC power supply (voltage source), and usually a 250 ohm resistor to create a 1 to 5 volt signal readable by any voltage-sensing indicator, controller, or recorder: The transmitter’s primary function in this circuit is to regulate current to a value representative of the… Read More »