Bently Nevada 125800-01 – Proximitor I/O Module | 3500 Series Machinery Protection System
Engineering Background
The Bently Nevada 3500 Series is the industry-standard platform for continuous online machinery protection in rotating equipment applications — turbines, compressors, pumps, and motors across oil & gas, power generation, and petrochemical facilities. The 125800-01 is the dedicated Proximitor I/O Module within this rack-based system, providing the critical interface between eddy-current proximity transducers and the 3500 monitoring rack’s signal processing infrastructure.
Product Positioning
Designed for procurement engineers and reliability teams requiring a certified, drop-in replacement or expansion module for existing 3500 Series installations. The 125800-01 maintains full backward compatibility with legacy rack configurations while meeting current API 670 machinery protection standards. Konmask.com supplies this module from verified industrial sources with full traceability documentation available on request.
Complete Technical Specifications
- Part Number: 125800-01
- Manufacturer: Bently Nevada (Baker Hughes)
- Series / Platform: 3500 Machinery Protection System
- Module Type: Proximitor I/O Module
- Transducer Compatibility: Eddy-current proximity probes (3300 XL, 7200 Series)
- Rack Compatibility: 3500/20 Rack Interface Module (RIM) based racks
- Signal Type: Proximity / Displacement (radial vibration, axial position, speed)
- Power Supply: Supplied via 3500 rack backplane (–24 VDC nominal)
- Operating Temperature: 0°C to +65°C (32°F to 149°F)
- Storage Temperature: –40°C to +85°C
- Humidity: 5% to 95% RH, non-condensing
- Weight: 400 g (approx.)
- Compliance: API 670, CE, RoHS
- Form Factor: Single-slot 3500 rack module
- I/O Termination: Via dedicated I/O terminal block (field wiring)
Proven Application Environments
- Steam and gas turbine protection systems (power generation)
- Centrifugal and reciprocating compressor monitoring (upstream/downstream oil & gas)
- Pump and motor radial vibration and axial thrust monitoring
- Gearbox and expander machinery protection
- Refinery and petrochemical rotating equipment trains
- LNG plant critical machinery protection racks
- Offshore platform machinery monitoring systems
Engineering Advantages
- API 670 Compliant: Meets the international standard for machinery protection systems — accepted by EPC contractors and end-user specifications globally.
- Hot-Swap Capable: Designed for online replacement within the 3500 rack without full system shutdown, minimizing plant downtime.
- High Signal Fidelity: Dedicated Proximitor circuitry ensures accurate gap voltage and dynamic signal conditioning for both static position and dynamic vibration measurement.
- Rack-Native Integration: Communicates directly with 3500 monitor modules via backplane — no external signal conditioning required.
- Proven Field Reliability: Bently Nevada 3500 Series modules are deployed in tens of thousands of machinery protection racks worldwide with documented MTBF exceeding 100,000 hours.
System Architecture & Signal Flow
The 125800-01 occupies a dedicated I/O slot in the 3500 rack. Proximity probe cables terminate at the module’s field wiring I/O block. The module conditions the raw probe signal — providing the –24 VDC probe drive voltage, receiving the gap-proportional DC output, and passing both static (DC gap) and dynamic (AC vibration) signal components to the paired 3500 monitor module via the rack backplane. The monitor module then applies configured alert and danger setpoints, driving relay outputs and communicating status to the 3500/20 RIM for DCS/SCADA integration via Modbus, Profibus, or Ethernet/IP depending on rack configuration.
Sourcing & Quality Verification
- Source: Procured from verified industrial surplus, OEM-authorized distributors, and decommissioned plant inventories with documented chain of custody.
- Inspection: Each unit undergoes visual inspection, connector integrity check, and functional verification prior to listing.
- Condition: Units are listed as tested-good unless explicitly noted otherwise. Condition grade available on request.
- Documentation: Original Bently Nevada datasheets, installation manuals, and calibration records available upon request.
- Warranty: 90-day operational warranty against DOA. Extended warranty options available — contact us.
Procurement Process
- Step 1 – Confirm Part Number: Verify 125800-01 against your 3500 rack BOM or existing module label before ordering.
- Step 2 – Request Datasheet / Test Report: Contact support@konmask.com for pre-purchase documentation package.
- Step 3 – Place Order: Order via Konmask.com storefront. Purchase orders (PO) accepted for qualified B2B accounts.
- Step 4 – Shipping: Ships within 1–3 business days. ESD-safe packaging. International freight available (DHL, FedEx, UPS). Export documentation provided.
- Step 5 – Installation Support: Bently Nevada 3500 Series installation documentation provided. Technical support available via email or phone.
Technical FAQ
Q: Is the 125800-01 compatible with all 3500 Series racks?
A: Yes — the 125800-01 is compatible with all standard 3500 rack configurations using the 3500/20 Rack Interface Module. Confirm your rack revision with Bently Nevada documentation if integrating with very early (pre-2000) rack revisions.
Q: Can this module be used with 3300 XL probes?
A: Yes. The 125800-01 is designed to interface with Bently Nevada 3300 XL and 7200 Series eddy-current proximity probe systems.
Q: What is the difference between the 125800-01 and other 125800-xx variants?
A: The -01 suffix designates the standard configuration. Other suffixes may indicate different I/O termination options or regional certifications. Contact us to confirm the correct variant for your application.
Q: Do you provide a Certificate of Conformance (CoC)?
A: Yes. A CoC is available upon request for all units. ATEX/IECEx documentation available where applicable.
Q: Can you supply multiple units for a plant-wide spares program?
A: Yes. Volume pricing is available for orders of 3+ units. Contact support@konmask.com with your quantity and delivery requirements.
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