Bently Nevada 330171-20-40-05-02-05 – Non-Contact Proximity Transducer | 3300 XL Series Platform
Engineering Background
The Bently Nevada 3300 XL Series represents the industry benchmark for eddy-current proximity sensing in rotating machinery protection. Engineered for continuous, non-contact measurement of radial shaft vibration, axial position, and differential expansion, this series is the preferred choice of reliability engineers in power generation, petrochemical, and heavy industrial facilities worldwide.
Product Positioning
The 330171-20-40-05-02-05 is a complete proximity transducer assembly configured with a 5 mm probe tip, 2 m armored probe cable, and 5 m extension cable — optimized for installations requiring moderate cable runs in high-vibration environments. It is fully compatible with Bently Nevada 3300 XL proximitor/seismic monitors and integrates directly into API 670-compliant machinery protection systems.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 330171-20-40-05-02-05 |
| Series / Platform | Bently Nevada 3300 XL Proximity Transducer System |
| Sensing Technology | Eddy-current (non-contact) |
| Probe Tip Diameter | 5 mm |
| Probe Cable Length | 2 m (armored) |
| Extension Cable Length | 5 m |
| Linear Range | 0.25 – 2.25 mm (nominal) |
| Scale Factor | 7.87 V/mm (200 mV/mil) |
| Frequency Response | DC – 10,000 Hz (–3 dB) |
| Supply Voltage | –24 VDC (nominal) |
| Output Voltage Range | –2 VDC to –18 VDC |
| Temperature Range (Probe) | –35°C to +177°C |
| Temperature Range (Proximitor) | –35°C to +85°C |
| Target Material | AISI 4140 steel (standard) |
| Connector Type | MIL-C-5015 series |
| Approvals / Compliance | API 670, CE, FM, CSA, ATEX (zone-dependent) |
| Weight | Approx. 210 g (probe + cable assembly) |
| Country of Origin | United States |
| HS Code | 9031.80 |
Proven Application Environments
- Steam & Gas Turbines — radial shaft vibration and thrust position monitoring per API 670
- Centrifugal Compressors — continuous rotor dynamic measurement in high-pressure trains
- Pumps & Fans — early-warning vibration detection for predictive maintenance programs
- Gearboxes — gear mesh frequency analysis and bearing orbit monitoring
- Hydro & Wind Turbines — axial position and differential expansion measurement
- Marine Propulsion Systems — shaft alignment verification in confined machinery spaces
Engineering Advantages
- Non-contact measurement eliminates mechanical wear and enables continuous 24/7 operation without maintenance intervals
- Wide frequency bandwidth (DC–10 kHz) captures both slow-roll runout and high-frequency sub-synchronous instabilities
- Armored cable construction resists oil, coolant, and mechanical abrasion in harsh plant environments
- Direct API 670 compliance simplifies machinery protection system certification and insurance audits
- Plug-and-play compatibility with all Bently Nevada 3300 XL proximitor monitors — no recalibration required
- Stable scale factor (7.87 V/mm) ensures consistent alarm and trip setpoint accuracy across temperature extremes
System Architecture & Signal Flow
The 330171-20-40-05-02-05 operates as part of a three-component eddy-current system:
- Probe (330171 series) — generates a high-frequency electromagnetic field directed at the rotating shaft target
- Extension Cable (330130 series) — transmits the RF signal between probe and proximitor with minimal signal loss over the 5 m run
- Proximitor Monitor (3300 XL) — demodulates the RF signal into a DC voltage proportional to the gap distance; outputs to DCS/PLC or dedicated machinery protection rack
Output signal is a negative DC voltage: closer gap = more negative voltage. The linear operating range of 0.25–2.25 mm provides a 2 V to 18 V output swing, directly readable by Bently Nevada 3500 series monitors, DeltaV, or any 4–20 mA transmitter with voltage input.
Sourcing & Quality Verification
- All units sourced from authorized distributors or verified OEM surplus channels
- Each assembly inspected for connector integrity, cable continuity, and probe tip condition prior to dispatch
- Original Bently Nevada labeling, part number markings, and date codes preserved and verified
- Calibration certificates and factory test reports available upon request for critical installations
- Traceability documentation provided for nuclear, offshore, and regulated facility procurement requirements
Procurement Process
- Confirm compatibility — verify your proximitor model (3300 XL, 3500/18, etc.) and cable run distance before ordering
- Request a quote — contact support@konmask.com for volume pricing, lead time, and documentation packages
- Order & payment — secure checkout via Konmask.com; T/T wire transfer available for B2B orders above USD 500
- Shipping — DHL / FedEx express worldwide; export documentation (commercial invoice, packing list, COO) included
- After-sales support — technical assistance available for installation, commissioning, and system integration queries
Technical FAQ
Q: Is the 330171-20-40-05-02-05 compatible with the Bently Nevada 3500/18 monitor?
A: Yes. The 3300 XL probe system is electrically compatible with 3500/18 proximitor inputs when using the correct gap voltage calibration curve.
Q: Can this transducer measure axial position as well as radial vibration?
A: Yes. With appropriate mounting hardware and a thrust collar target, the 330171 series measures both radial vibration and axial (thrust) position.
Q: What target material is required for accurate measurement?
A: AISI 4140 steel is the standard calibration target. Other ferromagnetic alloys require a material correction factor — contact us for application-specific calibration data.
Q: Is ATEX certification available for this configuration?
A: ATEX-certified variants are available. Please specify hazardous area classification (Zone 1/2, gas group, temperature class) when requesting a quote.
Q: What is the typical lead time?
A: In-stock units ship within 1–3 business days. For large-volume or documentation-intensive orders, allow 5–7 business days.
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