Product Overview
The 3500/65-01-01 is a specific configuration of the Keyphasor® Module for the Bently Nevada* 3500 Machinery Protection System. The suffix -01-01 denotes a standard hardware revision and configuration for this module. Its primary function is to generate a once-per-turn timing reference signal (the Keyphasor pulse) by monitoring a physical feature on a rotating shaft via a proximity transducer. This critical pulse is the fundamental timing mark used by all other monitoring modules in the system (e.g., for vibration phase measurement, speed tracking, and startup/shutdown data capture), enabling accurate analysis of dynamic machinery behavior.
Technical Parameters & Specifications
The following table details the key specifications for this standard configuration.
| Parameter Category | Specification |
|---|---|
| Full Part Number | 3500/65-01-01 |
| Module Type | Keyphasor® (Once-Per-Revolution) Module |
| Compatible Transducer | Eddy-Current Proximity Probes (e.g., 3300 XL 8mm or 11mm systems), Magnetic Pickups, or Optical Sensors. |
| Input Signal | Raw analog signal from the proximity probe. |
| Keyphasor Output | TTL-compatible pulse (to backplane for other monitors) and Buffered analog Keyphasor signal (for external devices). |
| Pulse Width | Adjustable, typically 5 to 50 degrees of shaft rotation. |
| Speed Range | 1 RPM to 50,000 RPM (functional, accuracy depends on probe/sensor) |
| Missing Pulse Detection | Yes, with configurable time delay to indicate sensor failure or loss of signal. |
| Loop Power | Provides -24 Vdc for powering two eddy-current proximity probes. |
| Module Power | Powered by the 3500 rack backplane. |
| Gap Voltage Display | Front-panel display shows measured average gap voltage for each connected probe. |
| Operating Temperature | -20°C to +65°C (-4°F to 149°F) |
| Mounting | Installs in a single slot of any 3500/05, /15, /25, or /92 rack frame. |
| Module Dimensions (H x W x D) | 190 mm x 54 mm x 200 mm (7.5 in x 2.1 in x 7.9 in) – Standard 3500 frame module size. |
| Weight (Module Only) | Approx. 0.5 kg (1.1 lbs) |
| Communication | Integrates with the 3500 rack backplane; configuration via the 3500/92 Communication Gateway or front-panel pushbuttons. |
| Compliance | cULus, CE, ATEX/IECEx (when installed in a qualified rack/enclosure). |
Application Scenarios
The Keyphasor module is an indispensable component for any rotating machinery analysis and protection system, providing the essential phase reference.
Turbine Supervisory Instrumentation (TSI): Used on every steam and gas turbine to provide the phase-lock signal for measuring synchronous vibration amplitude and phase via displacement probes (3500/45 modules), critical for balancing and detecting rotor cracks.
Compressor Performance Monitoring: On centrifugal and axial compressors, the Keyphasor pulse allows analysis of vibration vectors during surge events and tracks subsynchronous vibration components from aerodynamic instability.
Startup/Coastdown Data Capture: Enables the recording of Bode and Nyquist plots (vibration amplitude/phase vs. speed) during machine run-ups and shutdowns, which is the gold standard for detecting resonance and balance issues.
Motor & Pump Monitoring: On large, critical motors and pumps, it differentiates between 1X running speed vibration and other frequencies (e.g., 2X, blade pass frequency), enabling accurate fault diagnosis.
Aerospace Test Cells: Provides the rotational timing reference during testing of jet engines, turbochargers, and APUs for detailed performance and vibration analysis.
Torsional Vibration Analysis Systems: The Keyphasor signal serves as the primary input for systems measuring torsional vibration on crankshafts, gear trains, and multi-shaft arrangements.
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