Bently Nevada 330907-05-30-05-02-CN — Reverse Mount Proximity Probe | 3300 NSv Series
Engineering Background
The Bently Nevada 3300 NSv (Non-contacting Vibration) series is the industry benchmark for shaft vibration and position measurement in rotating machinery. Developed by Baker Hughes (formerly GE Bently Nevada), the 3300 NSv platform is deployed globally in turbines, compressors, pumps, and generators where continuous, high-accuracy proximity sensing is mission-critical. The Reverse Mount configuration (suffix -CN) is engineered for installations where the probe must be inserted from the non-observed side of the bearing housing, enabling access in mechanically constrained environments.
Product Positioning
Part number 330907-05-30-05-02-CN is a factory-configured, OEM-specification reverse mount eddy-current proximity probe. It is a direct drop-in replacement for existing 3300 NSv installations and is fully compatible with Bently Nevada 3300 XL series monitors and Proximitor® signal conditioners. Konmask.com supplies this unit from verified surplus and authorized distribution channels, with full traceability documentation available on request.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 330907-05-30-05-02-CN |
| Series / Platform | Bently Nevada 3300 NSv |
| Probe Type | Eddy-Current Non-Contacting Proximity Probe |
| Mount Configuration | Reverse Mount (CN) |
| Probe Length | 5 in (127 mm) — encoded as -05 in PN |
| Cable Length | 30 in (762 mm) integral cable — encoded as -30 |
| Extension Cable | 5 m (standard) — encoded as -05 |
| Connector Type | 02 — standard BNC-compatible termination |
| Sensing Range (Linear) | 0 – 2.54 mm (0 – 100 mil) |
| Sensitivity | 7.87 V/mm (200 mV/mil) nominal |
| Frequency Response | DC to 10,000 Hz (–3 dB) |
| Operating Temperature | –35 °C to +177 °C (–31 °F to +350 °F) |
| Supply Voltage | –24 VDC (via Proximitor® or compatible conditioner) |
| Output Signal | –2 VDC to –22 VDC (linear range) |
| Target Material | AISI 4140 steel (standard); other alloys per calibration |
| Probe Tip Diameter | 8 mm (0.315 in) |
| Thread Size | M10 × 1.0 (standard) |
| IP Rating | IP67 (probe body) |
| Approvals / Certifications | CE, ATEX (consult datasheet for zone classification) |
| Weight | ~500 g (probe + cable assembly) |
| Country of Origin | USA (Baker Hughes / Bently Nevada) |
Proven Application Environments
- Steam & Gas Turbines — shaft radial vibration and axial position monitoring per API 670
- Centrifugal Compressors — continuous rotor orbit and eccentricity measurement
- Boiler Feed Pumps & Large Pumps — bearing journal displacement tracking
- Electric Motors (>500 kW) — rotor dynamic analysis and imbalance detection
- Gearboxes — gear mesh frequency and shaft position monitoring
- Petrochemical & Refinery Trains — continuous online condition monitoring in hazardous areas
- Power Generation — turbine-generator sets requiring API 670 / ISO 10816 compliance
Engineering Advantages
- Reverse Mount Design — enables probe installation from the back of the bearing housing, critical in retrofit and space-constrained OEM frames
- Broadband DC–10 kHz Response — captures both low-speed runout and high-frequency sub-synchronous instabilities in a single channel
- High-Temperature Tolerance (177 °C) — suitable for hot-section turbine bearing pedestals without auxiliary cooling
- OEM Calibration Curve — factory-calibrated against AISI 4140 target; no field recalibration required for standard steel shafts
- Plug-and-Play Compatibility — direct replacement for existing 3300 NSv installations; no monitor reconfiguration needed
- Robust IP67 Sealing — withstands oil mist, steam condensate, and wash-down environments
System Architecture & Signal Flow
The 330907-05-30-05-02-CN operates as part of a three-component eddy-current measurement chain:
- Proximity Probe (this unit) — generates a high-frequency electromagnetic field (typically 1 MHz) at the probe tip; eddy currents induced in the rotating shaft attenuate the field proportionally to gap distance.
- Extension Cable — 5 m integral extension transmits the demodulated signal to the Proximitor® with matched impedance; cable length is factory-tuned and must not be altered.
- Proximitor® Signal Conditioner (e.g., 3300 XL 8mm) — supplies –24 VDC bias, demodulates the RF carrier, and outputs a calibrated DC voltage (–2 to –22 VDC) proportional to gap. This output feeds directly into Bently Nevada 3500 or 3300 series monitors, DCS analog input cards, or safety system voting logic.
Note: The probe, extension cable, and Proximitor® are a matched system. Substituting any component with a different series or length will shift the calibration curve and invalidate API 670 compliance.
Sourcing & Quality Verification
- Units sourced from verified surplus inventory and authorized distribution channels with full chain-of-custody documentation
- Each unit undergoes incoming inspection: visual examination, connector integrity check, and dimensional verification against OEM datasheet
- Functional bench test available on request (gap vs. output voltage linearity check)
- Original OEM packaging and labeling preserved where available
- Certificate of Conformance (CoC) and test reports available upon request
- Lead time: in-stock units ship within 2 business days; ex-stock lead time quoted per inquiry
Procurement Process
- Submit RFQ — email support@konmask.com with quantity, required delivery date, and destination port
- Receive Quotation — formal quotation with unit price (HKD/USD), lead time, and shipping options within 24 hours
- Order Confirmation — issue PO against quotation; proforma invoice issued for prepayment or net terms (qualified accounts)
- Shipment & Documentation — DHL / FedEx express or sea freight; commercial invoice, packing list, CoC, and HS code 8543.70 documentation provided
- After-Sales Support — 12-month warranty against manufacturing defects; technical support via email or WhatsApp
Technical FAQ
Q: Is this probe compatible with the Bently Nevada 3500 monitoring system?
A: Yes. The 3300 NSv probe is fully compatible with 3500 series monitors when used with the correct Proximitor® conditioner (3300 XL 8mm or equivalent). Verify the monitor channel configuration matches the probe sensitivity (200 mV/mil).
Q: Can I use a different extension cable length?
A: No. The probe, integral cable, and extension cable form a matched system calibrated at the factory. Altering cable length changes the system capacitance and shifts the output calibration. Always replace with the identical PN assembly.
Q: What is the difference between standard mount and reverse mount (CN)?
A: Standard mount probes are inserted from the observed (front) side of the bearing housing. Reverse mount (CN) probes are inserted from the opposite side, allowing installation where the front face is obstructed by piping, couplings, or structural members.
Q: Does Konmask provide ATEX-certified units?
A: ATEX certification depends on the specific unit’s manufacturing batch. Please specify your hazardous area classification (Zone 1/2, gas group, temperature class) in your RFQ and we will confirm certification status.
Q: What is the lead time for out-of-stock units?
A: Typical lead time for sourced units is 4–8 weeks depending on global availability. Contact us for expedited sourcing options.
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