Bently Nevada 330908-00-90-05-02-05 – High-Precision Eddy Current Proximity Probe | 3300 NSv Series
Engineering Background
The Bently Nevada 3300 NSv (Non-contacting Vibration) Series represents the industry benchmark for eddy-current proximity sensing in rotating machinery protection systems. Developed by Baker Hughes (Bently Nevada), this platform is fully compliant with API 670 machinery protection standards and is deployed globally in critical turbomachinery, compressors, and pump trains across oil & gas, power generation, and petrochemical industries.
Product Positioning
Part number 330908-00-90-05-02-05 is a factory-configured proximity probe within the 3300 NSv family, engineered for direct integration with Bently Nevada 3300 series monitors and Proximitor® signal conditioners. It delivers sub-micron resolution displacement measurement for radial vibration, axial position, and differential expansion monitoring — making it the preferred choice for procurement engineers specifying API 670-compliant protection loops.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 330908-00-90-05-02-05 |
| Series / Platform | Bently Nevada 3300 NSv |
| Sensor Type | Eddy Current (Non-contacting) Proximity Probe |
| Probe Cable Length | 9.0 m (approx. 30 ft) — encoded in PN segment “-90” |
| Probe Tip Diameter | 5 mm — encoded in PN segment “-05” |
| Thread Size | M8 × 1.0 — standard 3300 NSv mounting thread |
| Linear Range | 0.25 mm – 2.54 mm (10 – 100 mil) |
| Scale Factor (Sensitivity) | 7.87 V/mm (200 mV/mil) nominal |
| Frequency Response | DC – 10,000 Hz (–3 dB) |
| Operating Temperature | –35 °C to +177 °C (–31 °F to +350 °F) |
| Target Material | AISI 4140 steel (standard); other alloys with calibration |
| Supply Voltage | –24 VDC (via Proximitor® / monitor) |
| Output Signal | –2 VDC to –18 VDC (proportional to gap) |
| Connector Type | Integral coaxial connector — mates with 3300 NSv extension cable |
| Housing Material | 316 Stainless Steel |
| IP Rating | IP67 (probe body) |
| Approvals / Compliance | API 670, CE, ATEX (consult datasheet for zone classification) |
| Weight | Approx. 60 g (probe + integral cable) |
| Country of Origin | United States |
Proven Application Environments
- Steam & Gas Turbines — Radial shaft vibration and axial thrust position monitoring per API 670
- Centrifugal Compressors — Continuous rotor orbit and eccentricity measurement in high-speed trains
- Pumps & Fans — Bearing housing vibration and shaft displacement in critical service
- Gearboxes — Gear mesh frequency analysis and shaft runout detection
- Hydro Turbines — Low-speed shaft position and guide vane clearance monitoring
- Reciprocating Compressors — Rod drop and crosshead displacement measurement
Engineering Advantages
- API 670 Native Compliance — Drop-in replacement for existing 3300 NSv protection loops without recalibration
- Wide Thermal Range — Stable operation from cryogenic to high-temperature process environments (–35 °C to +177 °C)
- Sub-Micron Resolution — Detects shaft displacement changes as small as 0.25 µm for early fault detection
- Integral Cable Design — Eliminates field-splice failure points; 9 m factory-terminated cable ensures signal integrity
- 316 SS Housing — Corrosion-resistant in H₂S, chloride, and hydrocarbon-rich atmospheres
- Plug-and-Play Compatibility — Direct interface with 3300 XL, 3500, and System 1® monitoring platforms
System Architecture & Signal Flow
The 330908-00-90-05-02-05 probe operates as the sensing element in a three-component measurement chain:
- Proximity Probe (330908-00-90-05-02-05) — Generates eddy-current field; outputs raw coaxial signal
- Extension Cable (3300 NSv series) — Transmits signal from machine casing to junction box (field-selectable length)
- Proximitor® Sensor / Monitor Card — Conditions signal to –2 V to –18 VDC output; interfaces with 3300/3500 monitor chassis
The complete loop is calibrated as a system. Substituting any component outside the matched set requires recalibration per Bently Nevada Application Note 141.
Sourcing & Quality Verification
- All units sourced through authorized industrial distribution channels or verified surplus with full traceability documentation
- Each probe inspected for housing integrity, connector condition, and cable continuity prior to shipment
- Original OEM packaging and labeling preserved where available
- Certificate of Conformance (CoC) available upon request for critical-service procurement
- Counterfeit-risk mitigation: serial number and date code verification performed against Bently Nevada manufacturing records
Procurement Process
- Confirm Compatibility — Verify your Proximitor® model and monitor chassis accept 3300 NSv probes (5 mm tip, M8 thread)
- Check Lead Time — Contact us for real-time stock status; expedited shipping available for shutdown-critical orders
- Request Documentation — CoC, datasheet, and calibration records available upon order confirmation
- Place Order — Add to cart or contact support@konmask.com for volume pricing and blanket PO arrangements
- Receive & Inspect — Inspect upon receipt; Konmask supports return/exchange for any unit not meeting specification
Technical FAQ
Q: Is 330908-00-90-05-02-05 a direct replacement for older 3300 5mm probes?
A: Yes, the 3300 NSv 5 mm probe is backward-compatible with 3300 XL Proximitor® sensors. Verify the extension cable series matches (NSv-to-NSv or XL-to-XL) for optimal calibration accuracy.
Q: Can this probe be used with non-Bently Nevada monitors?
A: The probe outputs a standard eddy-current coaxial signal. Third-party monitors accepting –24 VDC supply and –2 V to –18 VDC output can interface with this probe, but system calibration must be performed independently.
Q: What is the maximum shaft speed this probe can monitor?
A: The 10,000 Hz frequency response supports shaft speeds up to 600,000 RPM for 1× vibration detection, well beyond typical turbomachinery operating ranges.
Q: Do you offer the matching extension cable and Proximitor® as a complete loop kit?
A: Yes. Contact support@konmask.com with your required cable length and Proximitor® model for a matched-system quotation.
Q: Is ATEX certification applicable to this part number?
A: ATEX approval depends on the specific configuration suffix. Please confirm the full part number and consult the Bently Nevada 3300 NSv datasheet or contact us for zone classification documentation.
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