Bently Nevada 133388-02 (often catalogued as 133388-2C) Tachometer Module is a two‑channel tachometer module for the 3500 Machinery Protection System. It accepts input from proximity probes or magnetic pickups to determine shaft rotative speed, rotor acceleration, zero speed, and reverse rotation, enabling precise shaft‑speed monitoring. The module provides peak‑hold for the highest speed, highest reverse speed, and number of reverse rotations with reset capability, supporting ongoing trend analysis. It also outputs conditioned Keyphasor signals to the 3500 rack backplane, enabling synchronization with other 3500 modules and integration with alarm setpoints for protective actions.
