Product Details:

Bently Nevada 72951-03-01-20-20 is a rack-mounted zero speed monitor board designed for Bently Nevada 3300 series turbine supervisory instrumentation system. This rotor stop detection module receives pulse signals from keyphasor or magnetic pickup sensors installed on rotating shafts, and accurately measures low rotational speed and zero-speed status of large rotating machinery such as steam turbines, centrifugal compressors and generators. It is a critical safety component used for turning gear interlock and maintenance safety lockout, which can prevent operators from opening equipment casings or carrying out maintenance work while the rotor is still rotating. The 72951-03-01-20-20 supports configurable zero-speed alarm thresholds. When rotor speed drops below the preset value, the module will trigger relay contact output and analog recording signals to external DCS and PLC control systems for interlock protection and data trending analysis. Built-in signal filtering circuits effectively filter electromagnetic interference and spurious pulse signals generated by mechanical vibration in power plants and petrochemical facilities, avoiding false speed readings and incorrect safety interlock actions. This monitor board is equipped with local status indication function, allowing field technicians to directly view speed status and fault information on the module. Installed inside the 3300 instrument rack, it communicates with rear terminal modules to receive sensor pulse signals and output relay alarm signals. It operates steadily within a wide working temperature range and supports long-term non-stop operation. Widely applied in power generation, petrochemical, metallurgy and chemical industries, this 3300 system speed monitor provides reliable rotor stationary state judgment for rotating equipment protection systems. It helps plant staff confirm safe conditions before overhaul operations, reduce safety risks caused by unexpected rotor rotation, cut down unplanned production downtime and support the plant's predictive maintenance strategy for critical rotating machinery assets.

Core Attributes:

Brand: Bently Nevada

Model: 72951-03-01-20-20

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 noise filtering, safety interlock support, visual alarm status indication