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The Bently Nevada 3500/25 126648-01 is a Keyphasor® module integrated into the 3500 machinery monitoring system, serving as a fundamental component for phase reference and timing in rotating equipment. It generates a Keyphasor signal by detecting a specific point on a rotating shaft (via proximity probes or optical sensors), which is essential for synchronizing vibration measurements, determining speed, and identifying phase-related faults such as unbalance or misalignment. The module features dual-channel input capability, fault diagnostics, and configurable output options (e.g., TTL pulses, analog signals). Designed for industrial reliability, it operates in harsh environments with resistance to temperature extremes, vibration, and electrical interference. The 126648-01 designation indicates specific hardware revisions or certifications for compatibility with the 3500 framework. Applications include gas and steam turbines, compressors, generators, and other critical machinery where accurate phase data is vital for predictive maintenance and operational safety. This module exemplifies Bently Nevada's legacy in providing high-integrity solutions for machinery health management.