Product Brief: Bently Nevada 3500/25 Enhanced Keyphasor Module
The 3500/25 Enhanced Keyphasor Module (part numbers 149369-01 + 125800-01) is part of the Bently Nevada 3500 series machinery protection system. It provides Keyphasor signals to the 3500 rack, which are used for accurate speed, phase, and timing measurements in rotating machinery monitoring.
Key Features
Supplies conditioned Keyphasor transducer signals to other 3500 modules (e.g., displacement, velocity, acceleration monitors).
Accepts proximity probe (eddy current), magnetic pickup, or other compatible speed sensors.
Provides a once-per-turn or multiple-per-turn pulse for synchronous data sampling.
Operates within the 3500 rack backplane; no standalone operation.
Parameters (Table)
| Parameter | Specification |
|---|---|
| Model | 3500/25 Enhanced Keyphasor Module |
| Part Numbers | 149369-01 (Module) + 125800-01 (Firmware/Config) |
| Dimensions (Height x Width x Depth) | 241 mm x 25 mm x 242 mm (9.5 in x 1.0 in x 9.5 in) – occupies one slot in 3500 rack |
| Weight (approx.) | 0.8 kg (1.75 lb) for the module alone |
| Input Channels | 2 independent Keyphasor inputs |
| Input Signal Range | -0.8 V to -22 V (DC) for proximity probes; 0–5 V for magnetic pickups |
| Outputs | Keyphasor signals to backplane |
| Frequency Range | 0 to 30,000 rpm (depending on sensor and target) |
| Operating Temperature | -20°C to +65°C (-4°F to +149°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Power Consumption | Typically 5.6 W (from rack) |
Application Scenarios (use cases)
| Application Area | Description |
|---|---|
| Steam Turbine Monitoring | Provides once-per-revolution pulse for shaft eccentricity and speed control. |
| Gas Turbine Protection | Used with speed sensors for overspeed detection and phase reference for vibration monitoring. |
| Compressors (Centrifugal/Axial) | Synchronous vibration and shaft position monitoring using Keyphasor timing. |
| Generators | Phase reference for torsional vibration analysis and rotor angle measurement. |
| Hydroelectric Turbines | Low-speed Keyphasor signal for runout compensation and speed measurement. |
| Test Stands & Research | High-accuracy timing for rotating machinery testing and diagnostics. |
Notes
The 125800-01 is typically associated with firmware or configuration settings for the 3500/25 module.
Must be installed in a 3500 rack with a compatible power supply and backplane (e.g., 3500/15 AC/DC power supply).
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