bently nevada 3500/34 TMR relay module The bently3500 system monitors the vibration of large rotating machinery: steam turbines, water turbines, fans, compressors, turbo expanders, electric motors and generators, exciters, gearboxes, water pumps, and more. Bentley monitor type selection: 3500/40M vortex, 3500f42M vortex/watt vibration, 3500/44M aeroengine, 3500/45 position, 3500/46M water conservancy, 3500/50 speed, 3500/53 overspeed protection,