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The Bently Nevada 3500/53 133396-01 is an overspeed detection I/O module integrated into the 3500 machinery monitoring system. It continuously monitors shaft speed using input from proximity probes or magnetic pickups, comparing real-time speed against user-configurable alarm and trip setpoints. When speed exceeds safe limits, the module triggers immediate safety responses (e.g., shutdown signals) to prevent catastrophic failures. Key features include high accuracy speed measurement, redundant processing channels for reliability, built-in diagnostics for sensor health monitoring, and compliance with international safety standards (e.g., IEC 61508). The module operates in harsh industrial environments with a temperature range of -30°C to +65°C and resistance to electrical noise and vibration. Applications include gas and steam turbines, compressors, and generators in power generation, oil and gas, and industrial facilities. The 133396-01 variant includes specific firmware and calibration for seamless integration with the 3500 framework, exemplifying Bently Nevada's commitment to engineered safety and reliability in machinery protection..