Introduction to Part 3500/25 149369-01
The 3500/25 149369-01 is a Keyphasor® Module for the Bently Nevada 3500 monitoring system. Its primary function is to provide a once-per-turn timing reference pulse from a rotating shaft. This Keyphasor signal is the fundamental timing benchmark for the entire monitoring system, enabling the measurement of rotational speed, the determination of phase angle for vibration analysis and balancing, and the identification of the orientation of vibration vectors. It conditions the input from a proximity probe or magnetic pickup transducer to generate a clean, reliable pulse that is distributed to all other monitoring modules in the rack.
Parameters / Specifications
The key technical parameters for the 3500/25 149369-01 module are summarized in the table below.
| Parameter | Specification | Notes / Explanation |
|---|---|---|
| Model Number | 3500/25 | Bently Nevada Keyphasor® Module |
| Assembly/Revision Code | 149369-01 | Manufacturer's internal assembly number. |
| Product Type | Rack-Mount Monitoring Module | |
| Compatible Rack | Bently Nevada 3500 Rack | Requires a 3500 series frame for operation. |
| Module Slot Size | Single Slot | Occupies one slot in the 3500 rack. |
| Dimensions (H x W x D) | Approx. 193mm x 55mm x 200mm | Standard dimensions for a 3500 series module. |
| Weight | Approx. 0.5 kg (1.1 lbs) | Typical weight for an electronic module of this type. |
| Power Requirement | +24 VDC (from rack backplane) | Powered by the main rack power supplies. |
| Input Type | • Eddy Current Proximitor® (from 3500/65 Driver) • Magnetic Pickup (MPU) | Can be configured for different sensor types. |
| Input Signal Range | Proximitor: -1 to -22 VDC MPU: 0.5 to 35 Vpk (at 60 RPM) | Accepts a wide range of signal levels. |
| Keyphasor Output | TTL-compatible pulse to all monitoring modules in the rack. | Provides the critical once-per-turn timing reference. |
| Front Panel Indicators | OK, Bypass, Active, Alert | LED status indicators for module and signal health. |
| Operating Temperature | -20°C to +65°C | Standard for industrial monitoring hardware. |
Application Scenarios
The 3500/25 Keyphasor Module is indispensable in any application requiring synchronized vibration data for machinery protection and diagnosis. It is the "clock" for the monitoring system.
Shaft Vibration Analysis: Provides the phase reference needed to determine the orientation of vibration vectors on turbines, compressors, and pumps, which is crucial for diagnosing unbalance, misalignment, and shaft cracks.
Rotational Speed Measurement: Directly measures and monitors the speed of rotating machinery, often used for overspeed protection and startup/shutdown profiling.
Orbital Vibration Analysis: The Keyphasor pulse is essential for plotting the orbit of a shaft within a bearing, a key diagnostic tool for fluid-film bearings.
Balancing Operations: Provides the mandatory phase angle reference for in-situ field balancing of rotors, allowing for precise placement of balance weights.
Order Tracking: Allows vibration analysis to be performed as a function of rotational speed (orders), which is critical for understanding machine behavior during startup and shutdown transients.
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