Bently Nevada 330881-28-10-090-03-02 Proximity Transducer | 3300 XL Series Eddy Current Sensor (Metric)
Engineering Background
The Bently Nevada 3300 XL Series represents the industry benchmark for non-contact eddy current proximity measurement in rotating machinery protection systems. Engineered to API 670 standards, this series has been the preferred choice of reliability engineers and OEM integrators across power generation, oil & gas, and petrochemical industries for over three decades.
Product Positioning
The 330881-28-10-090-03-02 is a metric-configuration proximity transducer designed for radial vibration, axial position (thrust), and differential expansion measurement on critical rotating equipment. It operates as part of the complete 3300 XL transducer system, pairing with a compatible extension cable and proximitor/oscillator to deliver a calibrated output signal to your condition monitoring system.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 330881-28-10-090-03-02 |
| Series | Bently Nevada 3300 XL |
| Sensor Type | Eddy Current Proximity Transducer |
| Thread Standard | Metric (M8 × 1.0) |
| Probe Tip Diameter | 8 mm |
| Cable Length (Probe) | 1.0 m (integral cable) |
| Extension Cable Length | 9.0 m (03 = 3 m driver; total system 10 m) |
| Linear Range | 0.25 mm – 2.26 mm (10 mil – 90 mil) |
| 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 (Operating) | –35°C to +177°C (probe tip) |
| Connector Type | 3-pin MIL-C-5015 (02 = standard) |
| Armor / Jacket | Stainless steel armor, PTFE jacket |
| Compliance | API 670, CE, ATEX (consult datasheet) |
| Weight | Approx. 1,250 g (complete assembly) |
Proven Application Environments
- Steam & Gas Turbines — Radial shaft vibration and axial thrust position monitoring per API 670
- Centrifugal Compressors — Continuous rotor dynamic surveillance in oil & gas processing trains
- Pumps & Fans — Bearing housing proximity measurement for predictive maintenance programs
- Gearboxes — Gear mesh frequency analysis and shaft orbit plotting
- Hydro Turbines — Slow-speed shaft position and differential expansion tracking
- Motor-Generator Sets — Air gap monitoring and rotor eccentricity detection
Engineering Advantages
- Non-Contact Measurement — Zero mechanical wear; suitable for continuous 24/7 operation on critical assets
- Wide Frequency Bandwidth — DC to 10 kHz captures sub-synchronous, synchronous, and high-frequency vibration components
- High Temperature Tolerance — Probe tip rated to +177°C; suitable for hot-section turbine bearing pedestals
- Metric Thread Configuration — Direct drop-in replacement for metric-bossed bearing housings without adapter hardware
- Stainless Armor Construction — Resists oil, steam, and chemical splash in harsh plant environments
- API 670 Compliant — Meets the international standard for machinery protection systems; accepted by major EPC contractors and insurance underwriters
System Architecture & Signal Flow
The 3300 XL proximity measurement chain consists of three components that must be ordered and matched as a system:
- Probe (330881-28-10-090-03-02) — Generates the eddy current field; integral 1.0 m cable terminates at the junction box or extension cable connector.
- Extension Cable (330130 Series) — Transmits the RF signal from probe to proximitor; total system cable length must equal 5 m or 9 m for correct calibration.
- Proximitor / Oscillator-Demodulator (3300 XL 8 mm) — Converts the RF signal to a DC voltage proportional to gap distance; mounts in the instrument rack or local junction box.
Output signal feeds directly to Bently Nevada 3500 Series rack monitors, System 1 software, or any 4–20 mA / voltage-input condition monitoring platform via appropriate signal conditioner.
Sourcing & Quality Verification
- All units sourced through authorized industrial distribution channels or verified surplus with full traceability documentation
- Each assembly inspected for physical integrity: connector pins, armor continuity, and probe tip condition prior to dispatch
- Calibration certificates and original factory documentation available upon request for new-in-box stock
- Konmask.com maintains a curated inventory of Bently Nevada 3300 XL components to support emergency replacement and planned outage schedules
Procurement Process
- Confirm Part Number — Verify 330881-28-10-090-03-02 against your existing system BOM or Bently Nevada datasheet DS-3300XL-01
- Check System Compatibility — Confirm proximitor model (3300 XL 8 mm) and total cable length (9 m extension + 1 m probe = 10 m system)
- Request Quote — Contact support@konmask.com with quantity, required lead time, and any documentation requirements
- Order & Ship — Standard orders dispatched within 1–3 business days; expedited options available for critical outage support
- Incoming Inspection — Use supplied checklist to verify part number label, connector type, and cable armor before installation
Technical FAQ
Q: Can this probe be used with a non-Bently Nevada proximitor?
A: The 3300 XL probe is optimized for Bently Nevada 3300 XL proximitors. Use with third-party drivers may alter scale factor and linearity; consult your instrumentation engineer before substitution.
Q: What is the difference between the -03-02 and -05-02 suffix?
A: The third segment (03) denotes the extension cable length in meters (3 m); the fourth segment (02) denotes the connector style. Ensure the total probe + extension cable length matches your proximitor calibration (typically 5 m or 9 m total).
Q: Is this part ATEX / IECEx certified for hazardous areas?
A: Certain 3300 XL configurations carry ATEX certification. Verify the specific approval markings on the product label and consult the Bently Nevada ATEX certificate before installation in Zone 1 or Zone 2 classified areas.
Q: What target material is this probe calibrated for?
A: Standard calibration is for AISI 4140 steel. For other target materials (stainless steel, titanium, aluminum), a material correction factor must be applied. Contact Konmask technical support for guidance.
Q: Can I order just the probe without the extension cable?
A: Yes. The 330881 series probe can be ordered independently. However, the complete measurement system requires a matched extension cable and proximitor for accurate calibration.
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