The AP4151-2000 is a wide-ranging, isolating signal conditioner for RTD inputs. The input is configured for a 3-wire RTD. (A 2-wire RTD can be used, by jumpering together terminals 4 and 5 on the mounting base.) The RTD types supported are Platinum, Nickel and Copper. Push button ranging is used for adjusting the input and output ranges.

The new model AP4151-2000 is really a single unit replacing two older models with many specific dash numbers, the AP4001 and the AP4151. The unit is selectable for an output that is either linear to resistance or linear to temperature.