Bently Nevada 3500/25-02-01-01 – Enhanced Keyphasor Module | 3500 Series Machinery Protection System
Engineering Background
The Bently Nevada 3500 Series is the industry-standard platform for continuous online machinery protection and condition monitoring in rotating equipment applications. Deployed across power generation, oil & gas, petrochemical, and heavy industrial facilities worldwide, the 3500 rack architecture provides modular, scalable vibration and process monitoring with API 670 compliance.
Product Positioning
The 3500/25-02-01-01 Enhanced Keyphasor Module (part numbers 149369-01 + 125800-01) is the dedicated phase-reference signal conditioning module within the 3500 rack. It accepts raw Keyphasor transducer signals—typically eddy-current proximity probes—and converts them into clean, conditioned once-per-revolution trigger pulses used by all other 3500 monitor modules for vector (amplitude + phase) vibration measurements, balancing, and dynamic analysis. Without a properly functioning Keyphasor module, phase-referenced measurements across the entire rack are unavailable.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (Module) | 149369-01 |
| Part Number (I/O Module) | 125800-01 |
| Ordering Number | 3500/25-02-01-01 |
| Module Type | Enhanced Keyphasor Module |
| Platform | Bently Nevada 3500 Series Machinery Protection System |
| Keyphasor Inputs | 2 channels per module |
| Transducer Compatibility | Eddy-current proximity probes (3300 XL, 7200 Series), magnetic pickups |
| Input Voltage Range | –24 VDC (standard Bently Nevada bias) |
| Output Signal | Conditioned TTL-level Keyphasor pulse; buffered outputs to rack backplane |
| Speed Range | 1 – 99,999 RPM |
| Trigger Mode | Once-per-revolution (1X); configurable notch/projection |
| Configuration Interface | Rack Configuration Software (RCS) via RS-232 / Ethernet gateway |
| Rack Slot Compatibility | 3500 Series rack (any standard I/O slot) |
| Power Consumption | Per 3500 rack power budget (module draws from backplane) |
| Operating Temperature | 0 °C to +65 °C |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 5% to 95% RH, non-condensing |
| Approvals / Standards | API 670, CE, cULus |
| Form Factor | Single-width 3500 rack module |
| Weight | ~1,480 g (module + I/O assembly) |
| Country of Origin | United States |
Proven Application Environments
- Power Generation: Steam turbines, gas turbines, hydro generators — phase reference for rotor dynamic analysis and balancing
- Oil & Gas: Centrifugal compressors, expanders, pipeline pumps — API 670-compliant protection systems
- Petrochemical & Refining: Critical rotating machinery requiring continuous online monitoring with SIL-rated protection
- Marine & Offshore: Propulsion turbines and compressor trains in harsh environments
- Industrial Manufacturing: High-speed spindles, blowers, and fans requiring precision phase tracking
Engineering Advantages
- Dual-Channel Architecture: Two independent Keyphasor inputs per module allow simultaneous monitoring of two shaft reference points or redundant configurations
- Enhanced Signal Conditioning: Improved noise rejection and wider input dynamic range versus legacy 3500/25 variants — reliable triggering even with degraded transducer signals
- Backplane Distribution: Conditioned Keyphasor signal is automatically distributed to all monitor modules in the rack via the 3500 backplane — no external wiring between modules required
- Hot-Swap Capable: Module can be replaced under power in a live rack (with appropriate rack configuration) minimizing plant downtime
- RCS Integration: Full configuration, calibration, and diagnostics via Bently Nevada Rack Configuration Software — supports remote commissioning
- API 670 Compliant: Meets the international standard for machinery protection systems in petroleum, chemical, and gas industry service
System Architecture & Signal Flow
The 3500/25-02-01-01 occupies a standard I/O slot in the 3500 rack. The associated I/O module (125800-01) mounts on the rear of the rack and provides the field-wiring terminal block for transducer connections. Signal flow:
- Transducer → Field wiring to I/O module (125800-01) terminal block
- I/O Module → Raw signal passed to front-end module (149369-01) via rack backplane connector
- Enhanced Keyphasor Module → Signal conditioning, threshold detection, pulse shaping
- Backplane Distribution → Clean TTL Keyphasor pulse broadcast to all monitor modules (3500/40M, 3500/42M, 3500/45, 3500/50, etc.)
- Monitor Modules → Use Keyphasor reference for 1X/2X vector calculations, phase trending, and orbit plots
Sourcing & Quality Verification
- ✅ OEM-Traceable Stock: Units sourced from decommissioned plant upgrades and authorized surplus channels — full traceability documentation available on request
- ✅ Functional Verification: Each module inspected and bench-tested prior to shipment; power-on self-test (POST) pass confirmed
- ✅ Cosmetic Grading: Rated and disclosed — Grade A (like-new) or Grade B (light field wear, fully functional) as applicable to your order
- ✅ Firmware Version: Documented and disclosed; RCS compatibility confirmed before dispatch
- ✅ Packaging: ESD-safe anti-static bags, foam-lined carton, double-boxed for international freight
Procurement Process
- Inquiry: Contact us with your required quantity, delivery timeline, and any specific firmware or grading requirements
- Quotation: We provide a formal quotation with unit price, lead time, and available stock condition within 24 hours
- Order Confirmation: Purchase order or online checkout — we accept T/T bank transfer, PayPal, and major credit cards
- Pre-Shipment Inspection: Final functional check and photo documentation sent to buyer before dispatch
- Shipping: DHL / FedEx / UPS express worldwide; EXW Xiamen or CIF destination available; typical transit 3–7 business days
- After-Sales: 90-day warranty on functionality; technical support for installation and RCS configuration
Technical FAQ
Q: What is the difference between 3500/25 and 3500/25-02-01-01?
A: The ordering suffix -02-01-01 specifies the Enhanced variant with dual Keyphasor inputs (02), standard I/O (01), and no special approvals suffix (01). The Enhanced version offers improved signal conditioning versus the base 3500/25.
Q: Can this module replace an older 3500/25 in an existing rack?
A: Yes. The 3500/25-02-01-01 is backward-compatible with existing 3500 racks. A RCS configuration update is required after installation to recognize the enhanced module type.
Q: Is the I/O module (125800-01) included?
A: Yes. This listing covers the complete assembly: front-end module (149369-01) + rear I/O module (125800-01), as indicated by the ordering number 3500/25-02-01-01.
Q: What transducer gap voltage is required?
A: Standard Bently Nevada eddy-current probes operate at –24 VDC supply with a nominal gap voltage of –10 VDC (±2 VDC). The module accepts the full –2 VDC to –18 VDC input range for trigger detection.
Q: Do you provide a certificate of conformance (CoC)?
A: Yes. A CoC with serial number, inspection date, and test results is provided with every shipment upon request.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
