Bently Nevada 125792-01 Enhanced Keyphasor Module – Reliable 1/rev Phase Reference for Turbomachinery Monitoring

• Warranty: 365 days

• Lead time: 1 week if in stock; no more than 1 month at the latest

• Payment: 50% advance; full payment before delivery

• Express options: FedEx, UPS, DHL

• Two-channel Keyphasor – Typically provides two independent 1/rev references for flexible machine train configurations.

• Multiple input types – Accepts proximity probe (via Proximitor), magnetic pickup, or logic-level inputs in many cases, making retrofits straightforward.

• Stable phase reference – Generates a clean Keyphasor pulse for accurate phase-triggered measurements and balancing work.

• Buffered outputs – Buffered transducer outputs are available on the I/O module for portable analyzers and commissioning checks.

• Rack backplane integration – Communicates over the 3500 rack backplane; no external power or network port required.

• Configuration through 3500 system tools – Parameters set via standard 3500 configuration software through the rack’s communication module.

• Industrial temperature range – Designed for typical -30 to +65 °C environments found in control rooms and E-houses.

You might notice that this module shows up anywhere a reliable phase reference is critical. Typical use cases include:

• Turbines and compressors – speed/phase for vibration diagnostics, startup coast-down, and balancing.

• Large pumps and fans – phase-reference for 1×, 2× harmonic analysis and fault correlation.

• Gearboxes – keyed phase for tooth-mesh analysis and shaft order tracking.

• Test stands and R&D rigs – stable trigger for data acquisition and acceptance testing.

A maintenance lead at a refinery told us: “Once we put the enhanced Keyphasor in, our balance jobs went from guesswork to predictable. The pulse stays clean even with electrical noise around the skid.”

• Compatibility with installed base – Designed for the Bently Nevada 3500 platform, so it drops into existing racks without surprises.

• Signal flexibility – Works with standard Bently proximitor/probe sets and magnetic pickups, which often reduces new sensor spend.

• Operational reliability – In many cases, the enhanced design provides better noise immunity and more consistent pulse recognition.

• Commissioning efficiency – Buffered outputs simplify verification with portable analyzers; saves technician time during startups.

• Assured availability – Stock-based fulfillment and committed lead times help keep turnarounds on schedule.

• Environment – Install in a standard Bently 3500 rack inside a clean, ventilated panel. Ambient typically -30 to +65 °C; avoid condensation and corrosive gases.

• Wiring – Use specified coax for proximitor runs; maintain shield continuity and proper grounding. Keep Keyphasor wiring away from high-voltage cabling to minimize noise.

• Probe setup – Set probe gap per the probe/proximitor datasheet. Verify amplitude and pulse width at the buffered output during commissioning.

• Safety – De-energize the rack slot before inserting/removing modules. Follow site ESD practices; handle by the edges.

• Routine checks – Periodically confirm 1/rev pulse stability and update configuration backups. Firmware updates, when applicable, are performed through the 3500 system tools.

• CE marked; UL/cUL for appropriate system builds; RoHS compliant.

• Hazardous area approvals (e.g., ATEX/IECEx) may be available depending on the full 3500 system configuration.

• Manufacturer’s standard warranty is typically 12 months; we provide a 365-day warranty on supply.

• 3500/05 or 3500/06 rack and power supplies

• 3500/22M communication module (for configuration and data access)

• 3300 XL proximity probes and Proximitor sensors (e.g., 330103, 330104 series) and matching extension cables

• Magnetic pickups (when a proximity solution is not feasible)

If you’re replacing an older Keyphasor card or planning a new train, share your rack slot count, sensor type (prox or MP), and required channel count. One thing I appreciate with this module is how predictable the commissioning goes when those basics are known up front—saves a lot of back-and-forth on site.