The Bently Nevada 3500/42M Proximity Monitor is a 4-channel monitor that receives inputs from proximity and seismic transducers, processes the signals to measure vibration and shaft position, and compares them with user-programmable alarms. Using the 3500 Rack Configuration Software, each channel can be configured for functions such as radial vibration, thrust position, differential expansion, eccentricity, REBAM, acceleration, velocity, shaft absolute, and circular acceptance region.