Bently Nevada 125744-02/125760-01 – Proximitor Interface Module | 3500 Series Machinery Protection System
The Bently Nevada 125744-02/125760-01 is a precision-engineered Proximitor Interface Module designed for the 3500 Series Machinery Protection System — the industry benchmark for continuous, real-time vibration and position monitoring of rotating machinery in critical industrial environments.
Engineered by Bently Nevada (Baker Hughes), this module serves as the signal conditioning bridge between eddy-current proximity probes and the 3500 rack’s monitoring cards, enabling accurate shaft displacement, eccentricity, and position measurements essential for turbine, compressor, and pump protection.
Konmask.com supplies this module as verified surplus inventory — fully tested, traceable, and ready for immediate deployment or system integration.
Complete Technical Specifications
- Part Numbers: 125744-02 (Interface Module) / 125760-01 (Companion Assembly)
- Platform: Bently Nevada 3500 Series Machinery Protection System
- Module Type: Proximitor Interface Module
- Function: Signal conditioning for eddy-current proximity probes (shaft displacement / position)
- Probe Compatibility: 3300 XL / 7200 Series Proximity Transducer Systems
- Output Signal: Conditioned DC voltage proportional to gap distance
- Supply Voltage: -24 VDC (from 3500 rack backplane)
- Operating Temperature: 0°C to +65°C
- Humidity: 5% to 95% RH, non-condensing
- Weight: Approx. 260 g
- Country of Origin: United States
- HS Code: 854389
- Certifications: CE, FM, CSA (per 3500 Series platform standards)
Proven Application Environments
- Gas Turbines & Steam Turbines — shaft radial vibration and axial position monitoring
- Centrifugal Compressors — rotor dynamic displacement measurement
- Pumps & Fans — eccentricity and slow-roll compensation
- Gearboxes — gear mesh frequency and shaft orbit analysis
- Petrochemical & Refinery Plants — API 670 compliant machinery protection
- Power Generation — continuous online monitoring for critical rotating assets
- LNG & Offshore Platforms — harsh environment, SIL-rated protection loops
Engineering Advantages
- API 670 Compliant: Meets the international standard for machinery protection systems
- High Signal Fidelity: Low-noise signal conditioning preserves probe linearity across full measurement range
- Plug-and-Play Integration: Direct backplane compatibility with 3500 Series rack — no external wiring adapters required
- Redundancy Support: Compatible with 3500 dual-voting and redundant rack configurations
- Compact Form Factor: Optimized for high-density rack installations without sacrificing channel isolation
- Long Service Life: Industrial-grade components rated for continuous 24/7 operation in demanding environments
System Architecture & Signal Flow
The 125744-02/125760-01 module operates within the 3500 rack architecture as follows:
- Proximity Probe (eddy-current sensor, installed on machine casing) detects shaft gap changes
- Proximitor Sensor (oscillator-demodulator) converts gap to DC voltage signal (typically -18 VDC at mid-range)
- 125744-02 Interface Module receives, conditions, and routes the signal to the 3500 monitor card via backplane
- 3500 Monitor Card (e.g., 3500/42M) processes the conditioned signal for alarm, trip, and Bently Nevada System 1 data acquisition
- DCS / Safety System receives relay outputs and 4–20 mA analog outputs for plant-wide integration
Sourcing & Quality Verification
All Bently Nevada modules supplied by Konmask.com undergo a rigorous multi-stage verification process:
- ✅ Visual Inspection: PCB, connectors, and housing checked for damage, corrosion, or counterfeit indicators
- ✅ Functional Bench Test: Module powered and signal-path verified against OEM specifications
- ✅ Traceability Check: Serial number and date code cross-referenced against known authentic production batches
- ✅ ESD-Safe Packaging: Shipped in anti-static bags with foam cushioning and moisture barrier
- ✅ Documentation: Test report and inspection certificate available upon request
Procurement Process
- Submit Inquiry: Contact support@konmask.com with your part number, quantity, and required delivery timeline
- Quotation: Receive a formal quotation with pricing, lead time, and availability confirmation within 24 hours
- Order Confirmation: Purchase order accepted via email; proforma invoice issued for payment processing
- Quality Hold: Module reserved and re-inspected prior to shipment
- Shipping: DHL / FedEx express worldwide; export documentation (commercial invoice, packing list, COO) included
- After-Sales: 90-day warranty on verified surplus; technical support available post-installation
Technical FAQ
- Q: Is the 125744-02 compatible with both 3300 XL and 7200 Series proximity systems?
- A: Yes. The module supports both Bently Nevada 3300 XL and 7200 Series eddy-current transducer systems when used within the 3500 rack platform.
- Q: Can this module be used in a SIL 2 safety loop?
- A: The 3500 Series platform supports SIL 2 applications when configured per Bently Nevada’s functional safety manual. Consult your safety engineer for loop validation requirements.
- Q: What is the difference between 125744-02 and 125760-01?
- A: The 125744-02 is the primary interface module; the 125760-01 is the associated termination or companion assembly. Both are typically ordered and installed together as a matched set.
- Q: Do you provide a certificate of conformance?
- A: Yes. A certificate of conformance and inspection report are available upon request for all verified surplus modules.
- Q: What is the lead time for this module?
- A: In-stock units typically ship within 2–3 business days. Contact us to confirm current availability.
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