Bently Nevada 330908-00-46-05-02-05 – 8mm Eddy-Current Proximity Probe | 3300 XL Series Platform
The Bently Nevada 330908-00-46-05-02-05 is a high-precision, 8 mm eddy-current proximity probe engineered for continuous shaft vibration and position monitoring in critical rotating machinery. As a core component of the 3300 XL Series transducer system, it delivers sub-micron resolution and long-term signal stability in the harshest industrial environments — from steam turbines to centrifugal compressors.
Procurement engineers sourcing replacement or spare transducers for API 670-compliant machinery monitoring systems will find this probe a direct, specification-matched substitute for OEM installations.
Complete Technical Specifications
| Part Number | 330908-00-46-05-02-05 |
| Series / Platform | Bently Nevada 3300 XL |
| Probe Tip Diameter | 8 mm |
| Cable Length | 5 m (16.4 ft) integral armored cable |
| Extension Cable | 02 (2 m) — matched system |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Linear Range | 0.25 – 2.26 mm (10 – 89 mil) |
| Bias Voltage | -24 VDC nominal |
| Supply Voltage | -24 VDC (via Proximitor® driver) |
| Frequency Response | DC – 10,000 Hz (±3 dB) |
| Temperature Range | -35°C to +177°C (probe tip) |
| Target Material | AISI 4140 steel (standard); other alloys per calibration |
| Connector | MIL-C-5015 style, gold-plated |
| Housing Material | 316 stainless steel |
| IP Rating | IP67 |
| Weight | ~230 g (probe + cable assembly) |
| Compliance | API 670, CE, RoHS |
| Country of Origin | United States |
Proven Application Environments
- Steam & Gas Turbines — radial shaft vibration and axial position monitoring per API 670
- Centrifugal Compressors — continuous rotor orbit and eccentricity measurement
- Pumps & Fans — bearing journal displacement in high-temperature sumps
- Gearboxes — gear mesh frequency analysis and shaft runout detection
- Hydro Turbines — slow-speed shaft monitoring with DC-coupled output
- Petrochemical & Refinery — continuous operation in H₂S and hydrocarbon atmospheres
Engineering Advantages
- Non-contact measurement — zero mechanical wear, infinite service life under normal conditions
- DC-coupled output — captures both static position (gap) and dynamic vibration in a single channel
- Factory-matched system — probe, extension cable, and Proximitor® driver calibrated as a set for ±1% linearity
- Armored integral cable — stainless steel braid resists abrasion, EMI, and chemical attack
- Wide temperature tolerance — qualified to +177°C tip temperature without recalibration
- Direct API 670 compliance — drop-in replacement for existing 3300 XL installations without system re-engineering
System Architecture & Signal Flow
The 330908-00-46-05-02-05 operates as part of a three-component eddy-current system:
- Probe (330908-00-46-05-02-05) — generates a high-frequency electromagnetic field at the tip; gap changes modulate the field impedance.
- Extension Cable (330130-xx) — low-loss coaxial cable transmits the modulated signal from the probe to the driver; length must match the calibrated system.
- Proximitor® Driver (3300 XL series) — demodulates the signal and outputs a linear DC voltage proportional to gap distance, feeding the monitoring system (e.g., 3500 rack).
Output voltage: Vout = –24V + (gap × 7.87 V/mm). A nominal –10 VDC output corresponds to a 1.78 mm (70 mil) gap — the recommended installation center point.
Sourcing & Quality Verification
- All units sourced from authorized distribution channels or verified surplus with full traceability documentation.
- Each probe is inspected for tip integrity, cable continuity, and connector condition prior to shipment.
- Calibration certificates and factory test data available upon request for critical-service applications.
- Packaging inspected for OEM labeling, date codes, and tamper evidence — counterfeit screening applied.
- Compatible with Bently Nevada 3500 Series monitoring racks and legacy 3300 Series systems.
Procurement Process
- Confirm part number — verify the full 330908-00-LL-05-02-05 string matches your cable length requirement (46 = 5 m probe cable).
- Verify extension cable — ensure your 330130-xx extension cable length is calibrated to match this probe for system accuracy.
- Submit RFQ — contact [email protected] for volume pricing, lead time, and documentation packages.
- Expedited shipping available — DHL Express / FedEx International Priority for urgent plant shutdowns.
- Payment — T/T, PayPal, and major credit cards accepted; Net-30 available for qualified accounts.
Technical FAQ
Q: Can this probe be used with a non-Bently Nevada monitoring system?
A: Yes, provided the receiving system accepts a –24 VDC biased, 200 mV/mil sensitivity signal. Verify input impedance ≥ 10 kΩ.
Q: What is the difference between the -46- and -05- cable length codes?
A: The first numeric segment (46) denotes the probe cable length in tenths of a foot — 46 = ~4.6 ft ≈ 1.4 m integral cable. The extension cable (02 = 2 m) brings the total system length to ~3.4 m. Always order probe and extension as a matched pair.
Q: Is recalibration required after replacement?
A: Factory-matched systems maintain ±1% linearity without field recalibration when the probe, extension cable, and driver are replaced as a matched set. Individual component substitution may require recalibration.
Q: What target materials are supported?
A: Standard calibration is for AISI 4140 steel. For Inconel, titanium, or other alloys, request a material-specific calibration certificate.
Q: What is the shelf life of an unused probe?
A: Indefinite when stored in original packaging at 15–35°C, <75% RH. Inspect connector and cable insulation before installation after extended storage.
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