Product Introduction: 3500/15 127610-01 + 129478-01
The 3500/15 127610-01 and 129478-01 together form a Keyphasor Module kit for the Bently Nevada 3500 Machinery Protection System. The 3500/15 is the main processing module, while the 129478-01 is a dedicated Proximity Transducer (probe).
This system is fundamental for measuring rotational speed and providing a timing reference (phase) for vibration measurements on a rotating shaft. The Keyphasor signal is a once-per-turn pulse that is essential for determining the rotational speed, identifying slow roll compensation, and analyzing vibration data in relation to the shaft's angular position. It is a critical component for condition monitoring, startup/shutdown analysis, and balancing operations.
Technical Parameters
The table below outlines the key parameters for both the module and the transducer.
| Parameter Category | Specification |
|---|---|
| Part Number Set | 3500/15 127610-01 (Module) + 129478-01 (Transducer) |
| Module Function | Keyphasor (Speed and Phase Reference) |
| Transducer Type | Proximitor (Eddy Current Probe) |
| Compatible Probe | 5 mm [0.2 in] Diameter, 330102-00-05-10-02-00 or equivalent |
| System Gap Measurement Range | 0.3 to 2.3 mm (12 to 91 mils) peak-to-peak |
| Keyphasor Signal Output | A digital (TTL) pulse for each revolution of the shaft. |
| Module Dimensions (H x W x D) | Approx. 190 mm x 60 mm x 140 mm (7.5 in x 2.4 in x 5.5 in) [Rack-dependent] |
| Module Weight | Approx. 0.7 kg (1.5 lbs) |
| Probe Dimensions (129478-01) | 5 mm diameter, length as per cable requirement (e.g., 1m, 2m, 5m, 9m). |
| Probe Weight | Approx. 0.2 - 0.5 kg (0.4 - 1.1 lbs) depending on cable length. |
| Mounting | Module slots into a 3500 series rack. Probe mounts in a threaded hole in a bracket near the shaft. |
| Operating Temperature (Module) | 0°C to +65°C (+32°F to +149°F) |
| Operating Temperature (Probe) | -40°C to +177°C (-40°F to +350°F) |
*Note: The module dimensions are standard for a 3500 series frame slot. Always consult the official Bently Nevada documentation for installation-specific details and tolerances.*
Application Scenarios
The 3500/15 Keyphasor Module and Probe are indispensable in any application requiring precise knowledge of shaft speed and phase. Key scenarios include:
Shaft Speed Measurement: Directly measuring and monitoring the rotational speed (RPM) of turbines, compressors, and motors for control and protection.
Phase Reference for Vibration Analysis: Providing the essential timing mark to determine the phase angle of vibration vectors. This is critical for:
Field Balancing: Identifying heavy spots on a rotor for in-situ balancing.
Startup/Coast-down Analysis: Capturing vibration data (Bode and Nyquist plots) as the machine passes through its critical speeds.
Synchronization: Used as a reference signal for other monitoring and diagnostic systems that need to be synchronized with the shaft rotation.
Torsional Vibration Analysis (indirectly): The Keyphasor signal can be used in specialized systems to detect non-uniform rotational speed indicative of torsional vibration.
This system is a cornerstone for protecting and managing the health of critical rotating equipment in industries such as Power Generation, Oil & Gas, and Chemical Processing.
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