Product Details:

Bently Nevada 72951-03-01-03-03 is a rack-mounted zero speed monitor board designed for Bently Nevada 3300 series turbine supervisory instrumentation system, functioning as a rotor stop detection module for large rotating machinery safety protection. This monitor board receives pulse signals from keyphasor or magnetic pickup sensors mounted on the rotating shaft, and precisely measures low rotational speed and zero-speed status of steam turbines, centrifugal compressors and generators. It acts as vital safety interlock hardware, confirming whether the rotor has fully stopped before maintenance activities to prevent unsafe operations while the shaft is still rotating. The 72951-03-01-03-03 supports independent configuration of zero-speed alarm thresholds. When rotor speed falls below the preset value, the module triggers relay contact output and analog recording signals to external DCS and PLC control systems for safety interlock and historical fault data trending. Built-in signal filtering circuits effectively suppress electromagnetic interference and false pulse signals caused by mechanical vibration in power plants and petrochemical facilities, eliminating false speed readings and unintended safety interlock actions. The module features local status indication, allowing field maintenance technicians to check real-time speed status and fault codes directly on the module without remote workstation access. Installed inside the 3300 instrument rack, it communicates with rear terminal modules to receive sensor pulse signals and execute relay alarm output. It operates reliably within a defined working temperature range and supports long-term non-stop continuous operation. Widely deployed in power generation, petrochemical, metallurgy and chemical industries, this 3300 system speed monitor forms a key safety layer for steam turbine protection systems. It helps plant operators verify rotor stationary conditions prior to overhaul, reduce safety risks associated with unexpected rotor rotation, minimize unplanned production downtime and support the plant’s predictive maintenance strategy for critical rotating machinery assets.

Core Attributes:

Brand: Bently Nevada

Model: 72951-03-01-03-03

Product Type: Zero Speed Monitor Board / Rotor Stop Detection Module

Compatible System: Bently Nevada 3300 series TSI monitoring rack

Input Sensor: Keyphasor sensor, magnetic pickup sensor

Function: Low speed and zero-speed measurement, configurable relay alarm output, analog recording output, local fault status indication

Mounting: Rack slot installation

Operating Temperature: 0°C ~ +65°C

Feature: Precision low-speed pulse processing, built-in signal noise filtering, safety interlock support, visual local alarm and fault indication