Bently Nevada 330101-39-67-10-12-05 – Eddy Current Proximity Probe | 3300 XL 8mm Series
Engineering Background
The Bently Nevada 3300 XL series represents the industry benchmark for non-contact shaft vibration and position measurement in rotating machinery. Developed under Baker Hughes (formerly GE Bently Nevada), this platform is the de facto standard in API 670-compliant machinery protection systems worldwide. The 330101 proximity probe is the primary sensing element of this ecosystem, converting mechanical displacement into a precise electrical signal for continuous condition monitoring.
Product Positioning
The 330101-39-67-10-12-05 is an 8mm eddy current proximity probe configured for a 1000 mm (39-inch) armored extension cable, 67-inch (1700 mm) integral cable, 10-32 UNF reverse-mount thread, 12-inch (305 mm) probe body, and standard 5-meter system cable. It is engineered for procurement engineers and reliability teams requiring a drop-in replacement or new installation in turbines, compressors, pumps, and gearboxes operating under API 670 / ISO 10816 standards.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 330101-39-67-10-12-05 |
| Brand / Manufacturer | Bently Nevada (Baker Hughes) |
| Series / Platform | 3300 XL 8mm Proximity Transducer System |
| Probe Tip Diameter | 8 mm |
| Sensing Technology | Eddy Current (Non-contact) |
| Linear Range | 0.25 mm – 2.25 mm (10 – 90 mil) |
| Scale Factor (Sensitivity) | 7.87 V/mm (200 mV/mil) nominal |
| Frequency Response | DC – 10,000 Hz (–3 dB) |
| Extension Cable Length | 1000 mm (39 inches) armored |
| Integral Cable Length | 1700 mm (67 inches) |
| Probe Body Length | 305 mm (12 inches) |
| Thread Type | 10-32 UNF, Reverse Mount |
| System Cable Length | 5 meters (05 suffix) |
| Operating Temperature | –35°C to +177°C (–31°F to +350°F) |
| Supply Voltage | –24 VDC (nominal), –20 to –26 VDC |
| Output Voltage Range | –2 VDC to –22 VDC |
| Target Material | AISI 4140 steel (or equivalent ferromagnetic) |
| Ingress Protection | IP67 (probe tip and body) |
| Compliance Standards | API 670, CE, RoHS |
| Compatible Driver/Monitor | Bently Nevada 3300 XL Driver (330180 series), 3500 Rack System |
| Weight | Approx. 50 g (probe assembly) |
| Country of Origin | United States |
Proven Application Environments
- Steam & Gas Turbines – Shaft radial vibration, axial position, and differential expansion monitoring per API 670
- Centrifugal Compressors – Continuous rotor orbit and eccentricity measurement in petrochemical and LNG plants
- Pumps & Fans – Bearing journal vibration surveillance in power generation and water treatment facilities
- Gearboxes – Gear mesh frequency analysis and shaft runout detection
- Electric Motors (>500 kW) – Rotor dynamic monitoring in critical drive trains
- Marine Propulsion Systems – Shaft alignment verification in offshore and naval applications
Engineering Advantages
- Non-Contact Measurement – Zero mechanical wear; suitable for continuous 24/7 operation without maintenance intervals
- Wide Frequency Bandwidth – DC to 10 kHz response captures both slow-roll runout and high-frequency sub-synchronous instabilities
- High Temperature Tolerance – Rated to +177°C, compatible with bearing housing installations adjacent to hot process fluids
- Armored Extension Cable – Stainless steel armor provides mechanical protection in high-vibration, high-pressure environments
- API 670 Compliant – Meets the mandatory machinery protection standard for critical rotating equipment in oil & gas
- Direct 3500 Rack Compatibility – Plug-and-play integration with Bently Nevada 3500 Series monitors; no signal conditioning adapters required
- Reverse-Mount Thread – 10-32 UNF reverse thread prevents probe backing out under vibration, ensuring stable gap setting
System Architecture & Signal Flow
The 330101-39-67-10-12-05 operates as the sensing element within a three-component transducer system:
- Proximity Probe (330101-XX) → Generates high-frequency electromagnetic field (1.0 MHz nominal); detects eddy current losses induced in the target shaft surface.
- Extension Cable (330130-XX) → Transmits the demodulated signal from the probe tip to the driver module with minimal signal degradation; armored construction isolates from EMI.
- Driver / Oscillator-Demodulator (330180-XX) → Converts the raw oscillator signal into a calibrated DC voltage output (–2 to –22 VDC); feeds directly into the 3500 monitor rack or DCS analog input card.
The output signal is a linear DC voltage proportional to the gap between probe tip and target surface, enabling real-time displacement measurement with ±1% full-scale accuracy.
Sourcing & Quality Verification
- OEM Traceability – All units sourced with original Bently Nevada / Baker Hughes documentation; batch and date codes available upon request
- Pre-Shipment Inspection – Each probe undergoes gap-voltage linearity verification against the 3300 XL calibration curve before dispatch
- Packaging Integrity – Shipped in anti-static, moisture-barrier packaging with foam-lined transit case; connector caps installed
- Warranty – 12-month operational warranty against manufacturing defects; RMA process supported
- Certifications Available – Material Test Reports (MTR), Certificate of Conformance (CoC), and calibration certificates available on request
Procurement Process
- Submit RFQ – Contact [email protected] with your required quantity, delivery timeline, and destination port
- Receive Quotation – Formal quotation with unit price (HKD/USD), lead time, and Incoterms (EXW / FOB Shenzhen) issued within 24 hours
- Order Confirmation – Purchase Order accepted; proforma invoice issued for T/T, L/C, or PayPal payment
- Quality Hold & Dispatch – Pre-shipment inspection completed; tracking number and commercial invoice provided within 2 business days of payment clearance
- After-Sales Support – Technical datasheet, wiring diagram, and installation guide provided post-shipment; engineering support via email
Technical FAQ
Q: Is the 330101-39-67-10-12-05 compatible with the Bently Nevada 3500/42M monitor?
A: Yes. The 3300 XL probe system is fully compatible with the 3500 Series monitor rack when used with the appropriate 330180 driver. Verify the driver gap voltage range matches your installation gap.
Q: What is the correct installation gap for this probe?
A: The nominal installation gap is 1.0 mm (40 mil), corresponding to an output of approximately –10.4 VDC. Acceptable range is 0.25–2.25 mm. Always verify with a calibrated gap tool and the driver’s calibration curve.
Q: Can this probe be used on stainless steel shafts?
A: The standard calibration is for AISI 4140 steel. Stainless steel (e.g., 316L) has different electrical conductivity and permeability, which shifts the scale factor. A target-specific calibration curve must be used. Contact us for application engineering support.
Q: What is the difference between the -05 and -08 suffix?
A: The last two digits denote the system cable length. -05 = 5 meters; -08 = 8 meters. All other specifications are identical. Ensure the total cable length (extension + system cable) matches your driver’s calibration.
Q: Do you provide ATEX / IECEx certified versions?
A: Bently Nevada offers ATEX-certified variants of the 330101 series for Zone 1/2 hazardous area installations. Please specify your area classification when submitting your RFQ.
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