MTT MS3010 Terminal Block Type Potentiometer Transmitter

We had an enquiry from a customer with an old level float switch that uses a potentiometer output to indicate tank level. They wanted to bring that reading into their new PLC-based monitoring system, which only accepts standard 4 to 20mA or voltage signals.

This looks simple, but a potentiometer output isn’t a signal in the usual sense — it’s a changing resistance, and resistance doesn’t travel well over long cable runs. The resistance of the lead wire itself adds error, especially on long runs, and if you try to read the resistance directly at the PLC end, you pick up whatever resistance the cable added along the way. Converting to a proper current or voltage signal as close to the sensor as possible avoids that error.

For this, we would normally recommend the MTT MS3010, a terminal block type potentiometer transmitter. It tracks the changing resistance of a potentiometric sensor — a position sensor, level float, or similar device — and converts it into a clean, standard 4 to 20mA or voltage output. Separate zero and span adjustments let a technician set the working range of the resistance sweep to match the physical travel of the sensor, without touching the sensor itself. It mounts on DIN rail right where the potentiometer wiring terminates, and isolation between input, output, and power keeps electrical noise out of the reading.

Before we quote, we would normally check the total resistance of your potentiometer, the physical travel range you actually want to use, and the output signal your PLC or DCS expects. Hope this helps — send us your sensor details and we can confirm the right model.