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The 3500/25 (149369-01) is a high-precision, half-height Keyphasor signal processing module designed for the 3500 Machinery Protection System developed by Bently Nevada. This module serves as the primary phase reference...
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The 3500/25 (149369-01) is a high-precision, half-height Keyphasor signal processing module designed for the 3500 Machinery Protection System developed by Bently Nevada. This module serves as the primary phase reference generator within machinery condition monitoring architectures, providing precise rotational timing signals derived from shaft-mounted sensors.
The Enhanced Keyphasor architecture allows the module to process pulses from proximity probes, magnetic pickups, or optical sensors to determine shaft rotational speed and vibration phase angle. This phase synchronization capability is critical for advanced diagnostic techniques such as orbital analysis, Bode plots, and polar plot generation, which help engineers identify mechanical faults including rotor imbalance, misalignment, and shaft rub conditions.
The 149369-01 version offers improved signal processing performance compared to legacy Keyphasor modules, supporting multiple pulses per revolution and providing enhanced electrical isolation and signal stability in high-noise industrial environments. It can support two Keyphasor inputs per module or up to four signals when paired in a full-height rack configuration.
| Item | Specification |
|---|---|
| Part Number | 149369-01 |
| Module Type | Enhanced Keyphasor (Half-height) |
| Input Channels | 2 Channels per module (4 channels paired) |
| Supported Sensors | Proximitor, magnetic pickup, optical sensors |
| Signal Logic | Pulse-per-revolution or multi-event pulse support |
| Speed Range | 1 RPM – 120,000 RPM (sensor dependent) |
| Input Voltage Range | +0.8 V to −21.0 V adjustable thresholds |
| Isolation | 500 Vdc galvanic isolation |
| System Interface | Compatible with 3500/22M TDI Module |
| Dimensions | 2.5 cm × 14.6 cm × 12.0 cm |
| Weight | 1.34 kg |
The 3500/25 (149369-01) is widely used in:
Steam turbine rotor monitoring
Gas compressor vibration diagnostics
Hydroelectric generator condition monitoring
Large industrial motor predictive maintenance
It is essential for machinery startup, shutdown, and coast-down monitoring where phase-synchronized vibration analysis is required.
Can the 149369-01 be used in a standard 3500 rack?
Yes. The module is a standard half-height design but must be installed in the correct rack location (typically near the power supply section) and may require a half-height chassis adapter depending on rack configuration.
What is the difference between this and the legacy 3500/25?
The Enhanced 149369-01 version provides improved noise immunity, broader input threshold adjustment ranges, and tighter integration with diagnostic software platforms for high-resolution transient analysis.
