Product Core Brief
- Model: 135473-01
- Brand: Bently Nevada (Baker Hughes)
- Series: 3500 Machinery Protection System
- Core Function: Keyphasor I/O module providing precise phase reference and rotor speed signals for vibration vector analysis and balancing.
- Product Type: Keyphasor / Phase Reference I/O Module
- Key Specs: Keyphasor Input/Output | 3500 Backplane Compatible | Phase Angle Measurement
- Condition: New Surplus / OEM Original
Bently Nevada 135473-01
Key Technical Specifications
- Module Type: Keyphasor I/O Module
- Function: Rotor Phase Reference & Speed Synchronization
- Sensor Compatibility: Proximitor® (Eddy Current) & Magnetic Pickups
- Signal Processing: Pulse Conditioning & Backplane Distribution
- System Compatibility: 3500/05 Frame, 3500/22 TDI, 3500/42M, 3500/50M
- Application: Orbit Plots, Bode/Polar Diagrams, Rotor Balancing
- Configuration: 3500 Rack Configuration Software
- Form Factor: Standard 3500 Series I/O Module
- Operating Temperature: -30°C to +65°C
- Power Supply: Backplane Powered (24 VDC)
Product Introduction
Serving as the timing heartbeat for the 3500 Machinery Protection System, this Bently Nevada 135473-01 Keyphasor module captures a once-per-revolution pulse to establish an absolute phase reference. It enables advanced diagnostics like orbit plots, Bode diagrams, and polar charts by synchronizing vibration vectors to a specific physical location on the rotor.
Without a clean Keyphasor signal, your vibration data is just amplitude without directional context. This module conditions the raw sensor pulse and distributes it across the backplane so multiple vibration monitors can share a single, highly accurate phase reference for comprehensive rotor dynamics analysis.
QA & Testing SOP
Phase reference modules must deliver pristine pulse timing. We verify signal conditioning and backplane distribution.
- Anti-Counterfeit & Visual Audit: We inspect the Bently Nevada silkscreen, verify the 135473-01 part number, and check the front panel sensor connectors for bent pins or physical damage.
- Backplane Enumeration Test: We install the module in an OEM 3500 test rack to verify it correctly enumerates and communicates with the 3500/22 TDI and 3500 Configuration Software.
- Pulse Conditioning Validation: We inject simulated Proximitor and magnetic pickup signals to verify the module correctly conditions the pulse, filters noise, and outputs a clean once-per-revolution trigger.
- Backplane Distribution Check: We verify the Keyphasor signal is correctly routed to adjacent vibration monitor slots, confirming downstream modules can lock onto the phase reference.
- ESD Safe Packaging: Precision pulse-conditioning ICs are ESD sensitive. We pack in anti-static shielding bags with desiccant to prevent latent semiconductor damage.
Bently Nevada 135473-01
Installation Pitfalls & Guide
❗ Keyphasor Target Alignment: The physical keyway or reflective tape on the rotor must align with the sensor at a known reference point. If the Keyphasor target is 180° out of phase, all your orbit plots and balance weights will be inverted. Always verify mechanical alignment before commissioning.
❗ Sensor Type Configuration: This module accepts both Proximitor and magnetic pickup sensors, but the internal conditioning is completely different. Misconfiguring the sensor type in software will result in either no signal or a noisy, unreliable phase reference. Match the software setting to the physical sensor.
❗ Single Point of Failure: If you use this module as the sole Keyphasor source for the entire rack and it fails, you lose phase reference for all vibration monitors. For critical assets, consider redundant Keyphasor sensors or a dedicated 3500/50 module with Keyphasor output as backup.
Replacement SOP:
- Pre-Install: Document the current Keyphasor configuration and sensor gap voltage; place the machine in bypass/maintenance mode.
- Removal: Power down the 3500 rack; disconnect the Keyphasor sensor wiring (label everything); remove mounting screws and extract the module.
- Install: Slide the 135473-01 into the designated slot, ensure firm backplane seating, and secure mounting screws.
- Power-On Test: Power up the rack, download the configuration, verify the Keyphasor LED pulses once per revolution, and confirm downstream vibration modules report valid phase angles.
Technical FAQ
Can I use this module with a 3500/50 Tachometer module?
Yes, and it’s recommended. The 3500/50 can generate a Keyphasor signal and distribute it across the backplane. If you already have a 3500/50, you may not need a dedicated 135473-01 Keyphasor module. However, if you need a standalone Keyphasor input without speed monitoring, this module is the correct choice.
What happens if the Keyphasor signal is lost during operation?
The 3500 system will flag a Keyphasor fault and freeze the last valid phase angle. Vibration monitors will continue to report amplitude (overall, 1X, 2X) but will stop updating orbit plots and phase-dependent parameters. The machine remains protected, but diagnostic capabilities are degraded.
Is this module hot-swappable?
While the 3500 system supports online maintenance, replacing a Keyphasor module will temporarily interrupt the phase reference for all dependent vibration monitors. For critical machinery, schedule a brief maintenance window to safely bypass protection before replacement.
Can I daisy-chain multiple Keyphasor sensors?
No. Each Keyphasor input should have a dedicated sensor. Daisy-chaining or splitting the signal can cause pulse distortion and timing errors. If you need redundancy, install two independent Keyphasor sensors and configure the system to use the primary with automatic failover.
Why is this sold as new surplus?
This unit was pulled from sealed OEM overstock or an unfulfilled project before installation. We test it on our OEM 3500 test racks to verify pulse conditioning and backplane communication, but we aren’t replacing internal components. You’re getting unused factory silicon with original manufacturing tolerances at a fraction of the active OEM list price.
