The Bently Nevada 3500/45 Position Monitor is a 4-channel monitor that accepts inputs from proximity probes, RPTs, DC and AC LVDTs, and rotary potentiometers to measure critical position parameters in rotating machinery. It conditions the input signals and compares them with user-programmable alarm limits. Using the 3500 Rack Configuration Software, you can configure each channel to monitor axial (thrust) position, various types of differential expansion, case expansion, and valve position.