Introduction
The configuration 3500/50 288062-02 + 133442-01 represents a Keyphasor® Module for the Bently Nevada 3500 Machinery Protection System, assembled from two core components:
3500/50 288062-02: This is the main Keyphasor Module assembly. It provides the core functionality: conditioning the signal from a Keyphasor transducer (typically an eddy current probe) to generate a sharp, once-per-turn pulse. This pulse is the critical timing reference for the entire monitoring system.
133442-01: This is a specific Front-Connector & Terminal Assembly that mounts onto the main module. It provides the physical screw terminals for wiring the transducer input, power, and output signals.
Together, they form a complete, installable module. The Keyphasor signal is fundamental for measuring rotational speed, phase angle (vibration phase lag), and for providing a timing mark for orbit plots and other synchronous data analysis. It is an essential module for any machinery train where dynamic motion analysis is required.
Parameters / Specifications
The key technical and physical specifications are summarized in the table below. Note that dimensions and weight are typically provided for the complete assembly.
| Parameter Category | Specification |
|---|---|
| Module Type | Keyphasor Module |
| System Part Number | 3500/50 288062-02 (Main Module) |
| Front Interface Part Number | 133442-01 (Connector/Terminal Assembly) |
| Compatibility | Bently Nevada 3500 Rack / Frame |
| Input Type | Compatible with Eddy Current Proximity Probes (e.g., 5 mm or 8 mm probes) or magnetic pickups. |
| Input Signal | Raw sine wave from a proximity probe. |
| Key Outputs | • Keyphasor Pulse: Isolated transistor output for the 3500 rack. • Buffered Transducer Signal: Analog output of the conditioned input signal. |
| Power Supply | Powered from the 3500 backplane. |
| LED Indicators | OK, Alert, Danger, and Module Fault status LEDs. |
| Configuration | Software configurable via the 3500/20 Rack Interface Module (settings like trigger level, filtering). |
| Dimensions (H x W x D) | Approx. 60 mm x 20 mm x 190 mm (Standard 3500 series full-height module with connector). |
| Weight (Approx.) | 0.30 kg (0.66 lbs) for the complete assembly. |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F). |
| Mounting | Installs in a dedicated slot within a 3500 series rack. |
Important: The exact input compatibility and output characteristics depend on the specific model and configuration. The 133442-01 connector assembly defines the terminal layout and may have specific voltage/current ratings for the buffered output.
Application Scenarios
The 3500/50 Keyphasor Module is indispensable in any application where knowledge of shaft rotational position and speed is critical for diagnostics and protection.
Vibration Phase Measurement: The most critical application. The Keyphasor pulse provides a reference point to measure the phase lag of vibration vectors. This is essential for rotor dynamics analysis, such as identifying unbalance, misalignment, rubs, and shaft cracks.
Speed Measurement & Overspeed Protection: By counting Keyphasor pulses per unit time, the system accurately measures rotor speed. This is used for startup/shutdown curves, avoiding critical speeds, and triggering overspeed shutdowns.
Orbit Generation (with an Oscilloscope or Software): The Keyphasor pulse provides the "dot" or starting point for orbit plots, which are X-Y plots of shaft motion from two orthogonal proximity probes. Orbits are a powerful diagnostic tool for fluid-induced instability and other rotor anomalies.
Synchronous Data Capture: For advanced diagnostics, it allows all vibration and position data to be captured synchronously with shaft rotation, enabling order tracking and synchronous time averaging to filter out non-synchronous noise.
Torsional Vibration Monitoring (Indirect): In specialized setups, changes in the timing of Keyphasor pulses can indicate torsional vibration events.
Typical Machinery:
Steam Turbines & Gas Turbines
Centrifugal & Axial Compressors
Large Motors and Generators
Pumps and Gearboxes where detailed vibration analysis is performed.
In summary, the 3500/50 288062-02 + 133442-01 is not just a speed sensor, but the central timing hub for advanced machinery diagnostics within the 3500 system, enabling the transition from simple protection to sophisticated condition analysis.
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