Bently Nevada 3500/40M 126615-01 Proximitor I/O Module with External Terminations128229 01 Proximitor Seismic Monitor I O Module by Bently Nevada The 128229 01 is a Proximitor Seismic Monitor I O Module, manufactured by Bently Nevada as part of the 3500 Series, designed for monitoring seismic activity. This module is a component of the 3500 40M, a four channel monitor that accepts input from proximity transducers, conditions the signal to provide various vibration and position measurements, and compares the signals with user