Did you get your Tech Tip of the week? Control Engineering offers a fresh Tech Tip every seven days, at www.controleng.com (upper right). This one shows how 4-20 mA offers a simple means of analog communication. The advantage that 4-20 mA current loops have is that (assuming no short circuits) every electron pushed out of the hot lead at the transmitter end must go into the corresponding termin...
Did you get your Tech Tip of the week? Control Engineering offers a fresh Tech Tip every seven days, at www.controleng.com (upper right). This one shows how 4-20 mA offers a simple means of analog communication. The advantage that 4-20 mA current loops have is that (assuming no short circuits) every electron pushed out of the hot lead at the transmitter end must go into the corresponding terminal at the receiver. Zero voltage input translates into 4 mA output. The full-scale current of 20 mA corresponds to the maximum sensor-output voltage.
