Introduction
The Bently Nevada 3500/25 149369-01+126648-01 is a Keyphasor module pair designed for use in the 3500 Series machinery protection system. The set comprises the 149369-01 Enhanced Keyphasor Module (processor front panel) and the 126648-01 Keyphasor I/O Module (rear termination interface). It accepts input signals from proximity probes or magnetic pickups to generate precise Keyphasor® pulses, providing an accurate timing reference for measuring shaft rotational speed and vibration phase angle. This enhanced version offers improved signal processing and backward compatibility, making it essential for reliable machinery diagnostics and protection in critical rotating equipment.
Parameters
The following table provides the detailed specifications for the Bently Nevada 3500/25 149369-01+126648-01 combination:
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada (a Baker Hughes business) |
| Model / Part Numbers | 3500/25 (149369-01 + 126648-01) |
| Product Type | Enhanced Keyphasor Module with I/O Module |
| Dimensions (H x W x D) | 241.3 x 44.5 x 292.1 mm (9.5 x 1.75 x 11.5 in) |
| Combined Weight | Approx. 2.0 kg (4.4 lbs) |
| Input Channels | 2 independent Keyphasor inputs |
| Input Types | Proximity probe transducers, magnetic pickups, or logic-level signals |
| Output Signals | Digital Keyphasor pulses to other 3500 modules and system interface |
| Power Consumption | Supplied via 3500 rack backplane; typical < 10 W |
| Mounting | Standard 3500 rack, half‑module width |
| Operating Temperature | -30°C to +65°C (-22°F to +149°F) |
| Humidity | 95% non‑condensing |
| Compliance | API 670, CE, UL, CSA |
Application Scenarios
The 3500/25 Keyphasor module combination is widely used in industries that rely on continuous monitoring of critical rotating machinery. Key application scenarios include:
Power Generation: Provides precise speed and phase reference for steam turbines, gas turbines, and hydroelectric generators, enabling accurate vibration analysis and overspeed protection.
Oil & Gas: Monitors compressors, pumps, and expanders in upstream, midstream, and downstream facilities to detect rotor instability and misalignment.
Petrochemical & Refining: Ensures reliable operation of critical process machinery such as centrifugal compressors and large pumps, supporting predictive maintenance programs.
Industrial Manufacturing: Applied in paper mills, steel plants, and cement kilns where large rotating rolls and drives require continuous vibration and speed monitoring.
Marine & Offshore: Protects propulsion turbines and auxiliary equipment on vessels and offshore platforms by providing essential phase and speed data for machinery protection systems.
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