Bently Nevada 330881-28-05-070-00-02 – Complete PROXPAC XL Proximity Transducer Assembly | 3300 XL Series
Engineering Background
The Bently Nevada 3300 XL Series represents the global benchmark for non-contacting eddy-current proximity measurement in rotating machinery protection systems. Engineered to API 670 standards, this platform is the preferred specification for turbines, compressors, pumps, and gearboxes in oil & gas, power generation, and petrochemical facilities worldwide.
Product Positioning
The 330881-28-05-070-00-02 is a complete PROXPAC XL Proximity Transducer Assembly — a factory-matched, pre-calibrated sensor-cable-driver system that eliminates field calibration uncertainty. Designed for direct drop-in replacement or new installation in 3300 XL monitor racks, it delivers OEM-grade measurement accuracy from day one. Konmask maintains verified stock with full traceability documentation.
Complete Technical Specifications
| Part Number | 330881-28-05-070-00-02 |
| Series / Platform | Bently Nevada 3300 XL PROXPAC |
| Assembly Type | Proximity Transducer Assembly (Probe + Extension Cable + Driver) |
| Probe Tip Diameter | 8 mm (standard XL) |
| Probe Length | 28 mm (per part number encoding) |
| Extension Cable Length | 5 m (per part number encoding) |
| Driver Cable Length | 7 m (per part number encoding) |
| Measurement Principle | Eddy-current, non-contacting |
| Output Signal | –24 VDC nominal (linear range) |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Linear Range | 0.25 mm – 2.26 mm (10 – 89 mil) |
| Frequency Response | DC – 10,000 Hz (–3 dB) |
| Supply Voltage | –24 VDC ± 1 VDC |
| Target Material | AISI 4140 steel (standard); other alloys available |
| Operating Temperature | –35°C to +177°C (probe); –35°C to +85°C (driver) |
| Ingress Protection | IP67 (probe body) |
| Compliance | API 670, CE, CSA, FM, ATEX (per driver variant) |
| Connector Type | MIL-C-5015 series (standard BN) |
| Weight | ~1,400 g (complete assembly) |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Country of Origin | United States |
| HS Code | 903180 |
Proven Application Environments
- Steam & Gas Turbines — shaft radial vibration and axial position monitoring per API 670
- Centrifugal Compressors — rotor dynamic measurement in high-pressure, high-temperature casings
- Reciprocating Compressors — crosshead and crankshaft displacement monitoring
- Pumps & Gearboxes — bearing journal orbit analysis and differential expansion
- Hydro Turbines — thrust position and guide bearing radial vibration
- Motor-Generator Sets — continuous shaft centerline tracking
Engineering Advantages
- Factory-Matched System — probe, cable, and driver calibrated as a matched set; no field re-calibration required
- API 670 Compliant — meets the international standard for machinery protection instrumentation
- Wide Frequency Bandwidth — DC to 10 kHz captures both slow-roll runout and high-frequency sub-synchronous instabilities
- High-Temperature Probe — rated to +177°C for hot-section turbine bearing housings
- IP67 Sealing — resists oil mist, steam condensate, and wash-down environments
- Direct Rack Compatibility — plug-and-play with 3300 XL monitors (3300/16, 3300/20, 3300/25, 3300/55)
- Verified Stock — active Bently Nevada catalog part; Konmask maintains authenticated inventory with traceability
System Architecture & Signal Flow
The PROXPAC XL assembly operates as a three-component eddy-current measurement chain:
- Probe (330880 series tip) — generates a high-frequency electromagnetic field that interacts with the conductive target shaft surface
- Extension Cable (330130 series) — transmits the detuned oscillator signal from the probe to the driver with controlled impedance; length-matched to maintain system calibration
- Driver / Proximitor (330181 series) — conditions the signal, provides –24 VDC excitation, and outputs a DC-coupled voltage proportional to gap distance; connects directly to the 3300 XL monitor input card
Output voltage is linear across the specified gap range: –10.4 VDC at 0.25 mm gap → –18.4 VDC at 2.26 mm gap, sensitivity 7.87 V/mm.
Sourcing & Quality Verification
- All units sourced from authorized distributors or verified OEM-surplus channels
- Each assembly inspected: connector pins, cable jacket, probe tip, and driver housing integrity
- Functional verification available on request (gap-voltage linearity test report)
- Original manufacturer labeling and traceability documentation preserved
- Stored in climate-controlled, ESD-safe environment; shelf-life managed
Procurement Process
- Confirm compatibility — verify your monitor rack model and cable lengths against the part number encoding above
- Request a quote — contact [email protected] for volume pricing, lead time, and export documentation
- Place order — secure checkout via Konmask.com; payment by T/T, credit card, or PayPal
- Shipping — DHL / FedEx express worldwide; EXW Xiamen or CIF available; typical lead time 3–7 business days
- Documentation — commercial invoice, packing list, COO certificate, and test report provided with every shipment
Technical FAQ
Q: Can I mix 330881 probes with older 330780 extension cables?
A: No. The 3300 XL system requires matched XL-series components. Mixing XL probes with standard 3300 cables causes calibration errors and may trigger false alarms.
Q: What monitor cards accept this assembly?
A: Compatible with all 3300 XL monitor modules: 3300/16, 3300/20, 3300/25, and 3300/55 radial vibration and position monitors.
Q: Is this assembly suitable for ATEX Zone 1 hazardous areas?
A: The -02 suffix indicates the standard (non-IS) driver variant. For ATEX/IECEx intrinsically safe applications, specify the -05 or -06 driver suffix. Contact us to confirm.
Q: What is the recommended replacement interval?
A: Bently Nevada recommends functional verification every 2 years or at each major overhaul. Probe tip should be inspected for mechanical damage at every outage.
Q: Can Konmask provide a calibration certificate?
A: Yes. A factory calibration certificate or third-party verification report can be arranged upon request at time of order.
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