Bently Nevada 330904-09-17-05-01-05 – 8mm Eddy Current Proximity Probe | 3300 NSv Series
The Bently Nevada 330904-09-17-05-01-05 is a factory-original 8mm eddy current proximity probe from the industry-standard 3300 NSv Series. Engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in critical rotating machinery, this probe is the preferred choice of reliability engineers and OEM integrators worldwide.
Product Positioning: Designed as a direct drop-in replacement or new-installation component for Bently Nevada 3300 Series monitoring systems. Fully compatible with 3300 XL 8mm extension cables and 3300 XL proximitor sensors. Ideal for procurement teams requiring traceable, specification-compliant parts with minimal commissioning risk.
Complete Technical Specifications
- Part Number / SKU: 330904-09-17-05-01-05
- Series / Platform: Bently Nevada 3300 NSv (Non-contacting Vibration)
- Probe Tip Diameter: 8 mm
- Cable Length: 0.9 m (90 cm) integral armored cable
- Extension Cable Length: 5.0 m (compatible with 330130 series)
- Proximitor / Driver: Compatible with 3300 XL 8mm Proximitor Sensor
- Measurement Principle: Eddy current (non-contacting)
- Nominal Gap Voltage: –10.0 VDC (at 1.0 mm gap)
- Scale Factor: 7.87 V/mm (200 mV/mil)
- Linear Range: 0.25 mm – 2.26 mm (10 – 89 mil)
- Frequency Response: DC to 10,000 Hz (–3 dB)
- Operating Temperature: –35°C to +177°C (–31°F to +351°F)
- Target Material: AISI 4140 steel (standard); consult factory for non-standard alloys
- Connector Type: Integral coaxial, reverse-polarity protected
- Housing Material: Stainless steel, hermetically sealed
- Ingress Protection: IP67
- Approvals / Certifications: CE, ATEX (consult datasheet for zone classification)
- Weight: Approx. 40 g
- Country of Origin: USA
Proven Application Environments
- Steam and gas turbines (radial shaft vibration, thrust position)
- Centrifugal and axial compressors
- Boiler feed pumps and large motor-driven equipment
- Gearboxes and expanders in petrochemical plants
- Power generation (nuclear, thermal, combined-cycle)
- Offshore platform rotating equipment under API 670 compliance
Engineering Advantages
- API 670 Compliant: Meets the 5th Edition standard for machinery protection systems — no derating or field modification required.
- High Thermal Stability: Calibrated scale factor maintained across the full –35°C to +177°C operating range, eliminating temperature-induced drift errors.
- Hermetic Seal: IP67-rated stainless steel housing resists process fluid ingress, steam condensate, and aggressive cleaning agents.
- Plug-and-Play Compatibility: Direct replacement for all 330904-xx-xx-xx-xx-xx variants within the 3300 NSv 8mm family — no recalibration of the proximitor required when gap is reset.
- Low Noise Floor: <25 mV RMS broadband noise, enabling detection of sub-micron shaft motion events.
System Architecture & Signal Flow
The 330904-09-17-05-01-05 operates as the sensing element in a three-component Bently Nevada eddy current system:
- Probe (330904-09-17-05-01-05) — generates the oscillating electromagnetic field and detects target proximity.
- Extension Cable (330130 series) — transmits the high-frequency signal with controlled impedance over distances up to 5 m.
- Proximitor Sensor (3300 XL 8mm) — conditions the signal, provides –24 VDC excitation, and outputs a calibrated –10 VDC analog signal to the monitor.
The analog output feeds directly into Bently Nevada 3500 Series rack monitors or third-party DCS/PLC inputs (4–20 mA via transducer card). No additional signal conditioning is required for standard API 670 installations.
Sourcing & Quality Verification
- Origin: Sourced from authorized Bently Nevada / Baker Hughes distribution channels and verified surplus with full traceability documentation.
- Inspection: Each unit undergoes incoming inspection including visual examination, connector integrity check, and impedance verification prior to shipment.
- Documentation: Certificate of conformance (CoC) and original manufacturer datasheet available upon request.
- Packaging: Ships in original or equivalent ESD-safe packaging with desiccant to prevent moisture ingress during transit.
Procurement Process
- Add to cart and complete checkout — or contact us for bulk/project pricing.
- Receive order confirmation with estimated lead time (typically 1–3 business days for in-stock units).
- Unit ships with CoC and packing list via DHL Express, FedEx International Priority, or customer-nominated forwarder.
- Technical support available pre- and post-sale for installation, gap-setting, and system integration queries.
Technical FAQ
Q: Is this probe interchangeable with the 330903 (5mm) series?
A: No. The 330904 is an 8mm probe and requires an 8mm-rated proximitor and extension cable. Mixing 5mm and 8mm components will result in incorrect scale factor and potential system fault.
Q: What gap voltage should I set during installation?
A: The recommended initial gap is 1.0 mm, yielding approximately –10.0 VDC at the proximitor output. Verify with a calibrated voltmeter before commissioning.
Q: Can this probe be used with non-Bently Nevada monitors?
A: Yes, provided the monitor accepts a –24 VDC-powered eddy current probe input and the scale factor (7.87 V/mm) is correctly configured. Consult your monitor manufacturer for compatibility.
Q: Do you offer calibration certificates?
A: Factory calibration data is embedded in the part number configuration. Third-party NIST-traceable calibration certificates can be arranged upon request at additional cost.
Q: What is the lead time for out-of-stock units?
A: Typical lead time for sourced units is 2–4 weeks. Contact us at [email protected] for real-time availability.
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