Bently Nevada 330904-00-25-05-02-CN – Eddy Current Proximity Probe | NSv Series Platform
Engineering Background
The 330904-00-25-05-02-CN is a factory-configured NSv Series proximity probe manufactured by Bently Nevada (Baker Hughes), the global standard-setter for machinery protection instrumentation. This part number encodes a 25 mm (1 in) tip diameter, 5 m (16.4 ft) integral cable, and a CN-style connector termination — a configuration widely specified in turbomachinery OEM documentation across power generation, petrochemical, and rotating equipment sectors.
Product Positioning
Designed as a direct drop-in replacement or new-installation component within Bently Nevada 3300 XL and NSv monitoring systems, this probe delivers the eddy-current sensing performance required by API 670 machinery protection standards. Konmask.com supplies this part to MRO procurement teams, reliability engineers, and OEM integrators who require traceable, specification-matched hardware with short lead times.
Complete Technical Specifications
- Part Number: 330904-00-25-05-02-CN
- Series / Platform: Bently Nevada NSv (Non-contacting Vibration)
- Sensing Technology: Eddy-current (non-contacting)
- Probe Tip Diameter: 25 mm (1.0 in)
- Cable Length: 5 m (16.4 ft) integral armored cable
- Connector Type: CN (coaxial, BNC-compatible interface)
- Output Signal: –200 mV/mil (–7.87 V/mm) nominal scale factor
- Linear Range: 0.25 mm – 2.25 mm (10 mil – 90 mil)
- Driver Compatibility: Bently Nevada 3300 XL / NSv drivers (330180, 330130 series)
- Operating Temperature: –35 °C to +120 °C (probe body)
- Target Material: AISI 4140 steel or equivalent ferromagnetic alloy
- Housing Material: Stainless steel, hermetically sealed
- IP Rating: IP67 (probe body)
- Weight: Approx. 40 g (probe body, excluding cable)
- Compliance: API 670 4th Edition compatible; CE marked
Proven Application Environments
- Steam and gas turbine radial/axial shaft vibration measurement
- Centrifugal compressor rotor position monitoring
- Pump and motor bearing displacement sensing
- Gearbox and expander shaft orbit analysis
- Bently Nevada 3500 / 3300 rack-based protection systems
- Retrofit and MRO replacement for aging NSv probe installations
Engineering Advantages
- API 670 Compliance: Meets the industry-standard specification for machinery protection instrumentation, ensuring regulatory and insurance acceptance.
- Hermetic Sealing: IP67-rated stainless steel housing resists process fluids, steam, and hydrocarbon atmospheres.
- Integral Cable Design: Factory-terminated 5 m cable eliminates field-splice failure points and maintains calibrated scale factor.
- CN Connector: Robust coaxial termination provides low-noise signal transmission and secure mechanical retention in high-vibration environments.
- Wide Temperature Range: –35 °C to +120 °C operation covers both arctic-rated outdoor installations and high-temperature turbine bearing housings.
- Direct System Compatibility: Plug-and-play with existing Bently Nevada 3300 XL and NSv driver/monitor infrastructure — no recalibration required.
System Architecture & Signal Flow
The 330904-00-25-05-02-CN operates as the sensing element in a three-component eddy-current measurement chain:
- Proximity Probe (this unit) — generates a high-frequency electromagnetic field at the tip; target displacement modulates the field impedance.
- Extension Cable — routes the modulated RF signal from the probe to the driver (typically Bently Nevada 330130 or 330180 series).
- Driver / Oscillator-Demodulator — converts the impedance variation into a DC voltage output (–200 mV/mil) fed to the monitor rack (3300 XL / 3500 series).
Total system cable length (probe integral cable + extension cable) must not exceed the driver’s specified maximum to maintain calibrated scale factor accuracy.
Sourcing & Quality Verification
- All units sourced through authorized distribution channels or verified surplus with full traceability documentation.
- Each probe is inspected for physical integrity, connector condition, and cable continuity prior to shipment.
- Serialization and date codes are preserved and documented in the shipping package.
- Certificate of Conformance (CoC) available upon request for regulated plant environments.
- Counterfeit-risk mitigation: Konmask.com applies Baker Hughes / Bently Nevada authentication guidelines to every unit processed.
Procurement Process
- Confirm part number 330904-00-25-05-02-CN against your BOM or existing probe label.
- Verify driver model and total cable length budget with your instrumentation engineer.
- Submit RFQ or place order directly — lead time typically 1–5 business days for in-stock units.
- Request CoC, packing list, and export documentation (HS Code 9031.80) at checkout notes.
- Expedited DHL / FedEx international shipping available; contact support for freight quotes.
Technical FAQ
Q: Is this probe compatible with the Bently Nevada 3500 monitoring system?
A: Yes. The 330904 series probes are compatible with 3500 rack monitors when paired with the appropriate NSv driver module. Confirm driver part number with your system documentation.
Q: Can I use a longer extension cable with this probe?
A: The integral cable is 5 m. Extension cables may be added, but total system cable length must remain within the driver’s specification (typically 5 m or 9 m total). Exceeding this will shift the scale factor and require recalibration.
Q: What target material is required?
A: AISI 4140 steel (or equivalent low-alloy ferromagnetic steel) is the calibration standard. Non-standard target materials (stainless steel, titanium, Inconel) require a material correction factor — consult Bently Nevada application engineering.
Q: Do you provide a warranty?
A: Konmask.com provides a 90-day functional warranty on all proximity probes. Extended warranty and exchange programs are available for volume procurement contracts.
Q: Is export documentation available for cross-border shipments?
A: Yes. We provide commercial invoice, packing list, and HS Code 9031.80 classification documentation. ECCN classification and end-user certificates available upon request.
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