Description
Product Core Brief
- Model: 3500/25 (Part: 149369-01)
- Brand: Bently Nevada
- Series: 3500 Machinery Protection System
- Core Function: Converts eddy current/magnetic sensor inputs into digital keyphasor signals for timing and phase measurement.
- Product Type: Enhanced Keyphasor Module
- Key Specs: Half-Height | Dual Channel | Replaces 125792-01
- Condition: New Original (New Surplus)
BENTLY 3500/25-01-01-00
Product Introduction
BENTLY 3500/25 149369-01 is an Enhanced Keyphasor module designed to provide keyphasor signals to monitor modules within the 3500 rack. It receives input signals from eddy current probes or magnetic pickups and converts them into digital keyphasor signals, indicating when a keyphasor mark on the shaft passes the sensor.
The 149369-01 is an upgraded version that provides extended keyphasor signal processing capabilities compared to previous designs. It maintains complete downward compatibility in form, fit, and function with legacy systems, fully replacing the older PWA 125792-01 Keyphasor module. This half-height, dual-channel module allows the 3500 system to measure shaft speed and vector parameters such as 1X vibration amplitude and phase.
Key Technical Specifications
- Module Type: Enhanced Keyphasor Module
- Form Factor: Half-Height, Dual Channel
- Input Sensors: Eddy Current Probes or Magnetic Pickups
- Input Signal Range: -0.8 V to -21.0 V (Non-Isolated) / +5 V to -11 V (Isolated)
- Power Consumption: 3.2 Watts (Normal)
- Outputs: 2 Buffered Keyphasor Outputs (Front Coaxial & Rear Euro-connector)
- Indicators: OK LED (Module Fault), TX/RX LED (RIM Communication)
- System Capacity: Up to 4 signals (Standard) / Up to 8 signals (Paired Configuration)
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Trace source via serial number. Inspect front panel coaxial connectors and rear Euro-connector for physical damage.
- Visual Inspection: Verify OK and TX/RX LED indicators and module seating alignment.
- Live Functional Test: Inject simulated keyphasor pulse. Verify OK LED illuminates and digital signal conversion.
- Communication Test: Install in rack. Verify TX/RX LED flashes, confirming successful handshake with Rack Interface Module (RIM).
- Final QC & Packaging: Seal in anti-static bag. Apply QC Passed label with date.
BENTLY 3500/25-01-01-00
Replacement Pitfall Guide
❗ Legacy Replacement: The 149369-01 is a direct replacement for the older 125792-01 Keyphasor module. No backplane modifications are required.
❗ Half-Height Adapter: This module is half-height. If installing into a full-height slot, a unique mounting adapter is required. Only two main modules (top and bottom half-slots) can be installed per rack.
❗ TMR Configuration: For Triple Modular Redundancy (TMR) applications requiring system keyphasor input, you must deploy two Keyphasor modules running in parallel to provide primary and secondary signals.
❗ Minimum Speed Requirement: If using passive magnetic pickups, the shaft speed must be greater than 200 rpm (3.3 Hz) for the module to trigger correctly.
❗ Signal Clipping: Input signals exceeding the specified voltage ranges will be internally clipped by the module. Ensure your sensor’s output falls within the acceptable limits to prevent phase measurement errors.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
- 3500/25 149369-01 → 125792-01 : Direct — Upgraded replacement for legacy Keyphasor module
- 3500/25 149369-01 → 125800-01 : Complementary — Requires matching Keyphasor I/O Module (Internal Terminals)
- 3500/25 149369-01 → 125800-02 : Complementary — Requires matching Isolated Keyphasor I/O Module
Benchmarks:
- Auto Threshold Trigger: 2V Peak-to-Peak minimum signal amplitude
- Manual Threshold Trigger: 500mV Peak-to-Peak minimum signal amplitude
