Bently Nevada 31000-28-05-50-050-03-02 – Proximity Probe Housing Assembly | 3300 XL Series Platform
Engineering Background
The Bently Nevada 3300 XL Series represents the industry benchmark for continuous vibration monitoring in rotating machinery. Designed to meet the rigorous demands of API 670 machinery protection standards, this platform is deployed globally across turbines, compressors, pumps, and motors in oil & gas, power generation, and petrochemical facilities.
Product Positioning
The 31000-28-05-50-050-03-02 is a precision-engineered proximity probe housing assembly, providing the mechanical interface and environmental protection for eddy-current proximity probes in the 3300 XL monitoring system. It ensures accurate, repeatable shaft displacement and vibration measurements in harsh industrial environments.
Complete Technical Specifications
- Part Number: 31000-28-05-50-050-03-02
- Manufacturer: Bently Nevada (Baker Hughes)
- Series / Platform: 3300 XL Proximity Transducer System
- Component Type: Proximity Probe Housing Assembly
- Probe Thread: 28 (metric thread designation per BN standard)
- Cable Length: 5.0 m (extension cable)
- Probe Length: 50 mm
- Gap Voltage Range: –10 VDC (nominal at 1.27 mm gap)
- Sensitivity: 7.87 V/mm (200 mV/mil)
- Frequency Response: DC to 10,000 Hz
- Operating Temperature: –35°C to +177°C (probe tip)
- Target Material: AISI 4140 steel or equivalent
- Housing Material: Stainless steel with corrosion-resistant finish
- Connector Type: BN standard coaxial
- Weight: Approx. 60 g
- Compliance: API 670, CE, RoHS
- Country of Origin: United States
Proven Application Environments
- Steam and gas turbine shaft vibration monitoring
- Centrifugal compressor radial and axial displacement measurement
- Pump and motor bearing vibration surveillance
- Gearbox and fan shaft position monitoring
- Offshore platform and subsea rotating equipment
- Refinery and petrochemical critical machinery protection
- Power generation (nuclear, thermal, hydro) turbine monitoring
Engineering Advantages
- API 670 Compliant: Meets international machinery protection standards for critical rotating equipment
- High-Temperature Rated: Probe tip rated to +177°C for hot-section turbine applications
- Non-Contact Measurement: Eddy-current technology eliminates mechanical wear and ensures long service life
- Wide Frequency Response: DC to 10 kHz captures both slow-roll and high-speed vibration events
- Stainless Steel Housing: Corrosion-resistant construction for offshore and chemical environments
- Direct System Compatibility: Plug-and-play with Bently Nevada 3300 XL monitors and 3500 series racks
System Architecture & Signal Flow
The 31000-28-05-50-050-03-02 housing assembly integrates within the Bently Nevada 3300 XL transducer chain as follows:
Probe Tip → Extension Cable (5.0 m) → Proximitor® Sensor → Monitor Module (3300/3500 Rack) → DCS / Safety System
The eddy-current probe generates a voltage signal proportional to the gap between the probe tip and the rotating shaft target. This signal is conditioned by the Proximitor® sensor and transmitted to the monitor module for real-time vibration analysis, alarm, and trip functions.
Sourcing & Quality Verification
- Source: Authorized distribution channel and verified surplus inventory
- Condition: New / Refurbished (as specified at order confirmation)
- Inspection: Each unit undergoes visual inspection and functional verification prior to shipment
- Documentation: Certificate of conformance and test report available upon request
- Traceability: Full lot traceability maintained; serial number records available
- Packaging: OEM-standard anti-static packaging with moisture barrier
Procurement Process
- Submit your inquiry with required quantity and delivery timeline
- Receive a formal quotation within 24 business hours
- Confirm order with purchase order or proforma invoice
- Payment via T/T, L/C, or agreed terms
- Shipment via DHL / FedEx / sea freight with full tracking
- Post-delivery technical support available via email or phone
Technical FAQ
Q: Is this part compatible with the Bently Nevada 3500 monitoring rack?
A: Yes. The 3300 XL proximity transducer system is fully compatible with 3500 series monitor modules when used with the appropriate Proximitor® sensor.
Q: What is the recommended gap setting for this probe?
A: The standard gap is 1.27 mm (50 mil), yielding a nominal output of –10 VDC. Refer to BN installation manual for target-specific calibration.
Q: Can this probe be used on non-ferrous target materials?
A: The standard calibration is optimized for AISI 4140 steel. Non-standard target materials require field recalibration using the Bently Nevada calibration procedure.
Q: What is the lead time for this part?
A: In-stock units ship within 3–5 business days. For large quantities or special configurations, contact us for availability.
Q: Do you provide a warranty?
A: Yes. All units carry a 90-day functional warranty. Extended warranty options are available upon request.
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