Bently Nevada 330905-00-21-05-02-CN – 8mm NSv Eddy Current Proximity Probe (Metric) | 3300 XL NSv Series
Engineering Background
The Bently Nevada 330905-00-21-05-02-CN is a factory-calibrated, metric-configuration eddy current proximity probe engineered for continuous, non-contact displacement and vibration measurement on rotating machinery. Designed as a core component of the 3300 XL NSv (Non-contacting Vibration) measurement system, this probe delivers the sub-micron resolution and long-term stability demanded by power generation, petrochemical, and heavy industrial turbomachinery applications.
Product Positioning
This probe is the preferred choice for procurement engineers specifying OEM-equivalent replacement sensors in Bently Nevada 3300 XL NSv systems. Its metric thread configuration (M8×1), 5-metre integral cable, and factory-matched driver compatibility make it a direct, plug-and-play replacement with no field recalibration required.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 330905-00-21-05-02-CN |
| Series / Platform | Bently Nevada 3300 XL NSv |
| Probe Type | Eddy Current Proximity Probe (Non-contacting) |
| Tip Diameter | 8 mm |
| Thread Configuration | Metric (M8×1) |
| Cable Length | 5.0 m (integral, extension cable: 02 = 2 m) |
| Linear Range | 0.25 – 2.25 mm (nominal) |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Output Voltage Range | −1 VDC to −17 VDC (with matched driver) |
| Supply Voltage | −24 VDC (nominal) |
| Frequency Response | DC to 10 kHz (−3 dB) |
| Operating Temperature | −35°C to +177°C (probe tip) |
| Target Material | AISI 4140 steel (standard calibration) |
| Connector | Coaxial, 02 = standard BN connector |
| Approvals | CE, ATEX (refer to BN documentation) |
| Weight | ~50 g |
| Country of Origin | China (CN suffix = China-market variant) |
Proven Application Environments
- Steam & Gas Turbines – Shaft radial vibration and axial position monitoring per API 670
- Centrifugal Compressors – Continuous rotor orbit and eccentricity measurement
- Pumps & Fans – Bearing housing displacement trending for predictive maintenance
- Gearboxes – Gear mesh frequency analysis and shaft runout detection
- Electric Motors (>1 MW) – Air-gap monitoring and rotor dynamic analysis
- Marine Propulsion Systems – Shaft alignment verification under load
Engineering Advantages
- Factory-Matched System Calibration – Probe, extension cable, and driver are calibrated as a matched set; no field adjustment required on installation
- NSv Technology – Non-contacting measurement eliminates wear, enabling >10-year MTBF in continuous service
- High EMI Immunity – Coaxial cable construction and differential driver architecture reject common-mode electrical noise in VFD-rich environments
- Wide Temperature Tolerance – Rated to +177°C at the probe tip, suitable for hot-section turbine bearing pedestals
- API 670 Compliant – Meets the machinery protection standard for critical rotating equipment in oil & gas facilities
- Metric Thread (M8×1) – Direct replacement for existing metric probe bosses; no adapter required
System Architecture & Signal Flow
The 330905-00-21-05-02-CN operates within the Bently Nevada 3300 XL NSv measurement chain:
- Probe Tip – Generates a high-frequency electromagnetic field (eddy current excitation) directed at the rotating shaft surface
- Integral Cable (5 m) – Transmits the modulated signal with minimal loss; coaxial construction shields against EMI
- Extension Cable (2 m, -02 suffix) – Extends reach to the driver/monitor enclosure; must be BN-matched for calibration integrity
- Driver / Proximitor – Demodulates the carrier signal and outputs a DC voltage proportional to gap distance (7.87 V/mm)
- 3300 XL Monitor – Processes the DC output for alarm, trip, and data acquisition functions
Sourcing & Quality Verification
All Bently Nevada proximity probes supplied by Konmask.com are sourced through verified industrial distribution channels. Each unit undergoes the following verification protocol before dispatch:
- Visual inspection of probe tip, cable jacket, and connector for physical integrity
- Continuity and insulation resistance check on integral cable
- Sensitivity verification against BN calibration standard (7.87 ± 0.25 V/mm)
- Packaging inspection for OEM labelling, part number, and date code consistency
- Certificate of conformance (CoC) available on request
Procurement Process
- Add to Cart – Select quantity and proceed to checkout
- RFQ / Bulk Orders – Contact support@konmask.com for volume pricing, lead time confirmation, and CoC documentation
- Payment – T/T bank transfer, PayPal, and major credit cards accepted
- Shipping – DHL / FedEx express worldwide; EXW Xiamen available for freight consolidation
- Lead Time – In-stock items ship within 1–3 business days; ETA confirmation provided at order
Technical FAQ
- Q: Is the -CN suffix a different calibration from the standard 330905-00-21-05-02?
- A: The CN suffix denotes the China-market distribution variant. Electrical and mechanical specifications are identical to the global part; calibration is performed to the same BN factory standard.
- Q: Can this probe be used with a 3300 XL 8mm driver other than the NSv type?
- A: No. The NSv probe must be paired with an NSv-compatible driver (e.g., 330180 series). Mixing with standard 3300 XL drivers will result in calibration errors and potential false trips.
- Q: What is the maximum shaft surface speed this probe can measure?
- A: The eddy current measurement is non-contact and has no mechanical speed limit. The 10 kHz frequency response supports shaft speeds up to approximately 600,000 RPM for 1× vibration measurement.
- Q: Do you provide a calibration certificate?
- A: A Certificate of Conformance (CoC) is available on request. Third-party NIST-traceable calibration reports can be arranged for an additional fee.
- Q: What is the recommended gap setting for initial installation?
- A: The nominal installation gap is 1.0 mm (midpoint of the 0.25–2.25 mm linear range), corresponding to an output of approximately −8.0 VDC with the matched driver.
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