The Bently Nevada Enhanced Keyphasor Module is a half-height, two-channel module designed for the 3500 Series machinery protection system . Its primary function is to interface with proximity probes or magnetic pickups to provide precise Keyphasor signals to other monitor modules within the rack . These digital signals indicate exactly when a keyway or mark on the rotating shaft passes the transducer, providing a crucial phase reference for vibration analysis and speed measurement .

The module accepts input signals from up to two transducers. It conditions these signals and provides two buffered Keyphasor outputs for external use. The input signal range for non-isolated I/O modules is +0.8V to -21.0V . Each channel is equipped with a power supply capable of delivering -24 VDC at up to 40 mA to power the connected sensors .

This enhanced version offers expanded signal processing capabilities compared to previous designs while maintaining full form, fit, and function compatibility, making it suitable for both new installations and legacy system upgrades . The 3500 rack can accept up to four Keyphasor modules in a standard configuration, providing phase reference signals essential for diagnostic tools like Bode plots, Nyquist plots, and orbit analysis .