MTT MS3103 Terminal Block Type Millivolt Isolator

We had an enquiry from a customer with a load cell on a hopper scale who needed the weight signal to feed both their batching PLC and a separate, independent overload alarm relay, from the same load cell.

This looks simple, but millivolt signals are already the most fragile signal type to wire in a plant, and splitting one output to feed two separate systems multiplies that risk — any loading or ground-sharing between the two destinations shows up as drift or noise on both. The lower the signal level, the less margin there is for error.

For this, we would normally recommend the MTT MS3103, a terminal block type millivolt isolator with isolated dual output. It takes a low millivolt input and splits it into two fully independent, isolated DC outputs, so a control system and a separate alarm or monitor can both read the same measurement without interacting. It accepts a choice of AC or DC power, so it fits panels without a dedicated low-voltage supply, and it converts the signal to something robust right at the source, where the millivolt wiring terminates. It mounts on DIN rail, with front-accessible zero and span trimmers for on-site calibration.

Before we quote, we would normally check the millivolt span from your sensor, the output range needed on each of the two outputs, and the power supply available at the panel. Hope this helps — send us your details and we can confirm the right model.