The Bently Nevada 146031-01 is a Keyphasor I/O Module designed for use with the 3500/25 monitoring system. This essential component serves as the interface for up to two Keyphasor transducers, which are critical for providing a once-per-turn or multiple-event-per-turn timing pulse from a rotating shaft. The module conditions the input signals from proximity probes or magnetic pickups and converts them into digital signals that the 3500/25 monitor uses to determine shaft rotational speed and vector parameters like 1X vibration amplitude and phase. The 146031-01 model specifically features internal terminations for streamlined installation within the 3500 rack, ensuring reliable and precise machinery diagnostics and protection for critical rotating equipment.