Bently Nevada 330881-28-06-155-00-02 — PROXPAC XL Proximity Transducer Assembly | 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. Designed to meet API 670 requirements, this platform is the standard of choice for turbomachinery OEMs, EPC contractors, and plant reliability engineers worldwide. The PROXPAC XL assembly integrates the transducer, extension cable, and driver into a factory-matched, calibrated system — eliminating field-calibration variables and ensuring measurement traceability from day one.
Product Positioning
Part number 330881-28-06-155-00-02 is a complete PROXPAC XL proximity transducer assembly configured for a 28 mm probe tip diameter, 6-inch (152 mm) probe length, 155-inch (3937 mm) total cable length, and standard −24 VDC driver bias. Purpose-built for radial vibration, axial position (thrust), and differential expansion measurements on steam turbines, gas turbines, compressors, and large rotating equipment where continuous, high-reliability monitoring is mandatory.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 330881-28-06-155-00-02 |
| Series / Platform | Bently Nevada 3300 XL / PROXPAC XL |
| Probe Tip Diameter | 28 mm (1.1 in) |
| Probe Length | 6 in (152 mm) |
| Total System Cable Length | 155 in (3,937 mm / ~3.94 m) |
| Sensing Technology | Eddy-current (non-contact) |
| Driver Supply Voltage | −24 VDC nominal |
| Output Scale Factor | 200 mV/mil (7.87 V/mm) — standard |
| Linear Range | Approx. 25–325 mil (0.635–8.255 mm) |
| Frequency Response | DC to 10,000 Hz (−3 dB) |
| Operating Temperature | −35°C to +177°C (probe); −35°C to +85°C (driver) |
| Target Material | AISI 4140 steel (standard); other alloys with derating |
| Connector Type | Standard BN armored cable with factory-terminated connectors |
| Compliance | API 670 5th Edition; CE; RoHS |
| Weight | Approx. 1,400 g (complete assembly) |
| Country of Origin | United States |
Proven Application Environments
- Steam Turbines — Radial shaft vibration and axial thrust position monitoring per API 670
- Gas Turbines & Compressors — High-temperature, high-vibration environments requiring stable DC output
- Centrifugal Pumps & Fans — Continuous online monitoring for predictive maintenance programs
- Gearboxes — Gear mesh frequency detection and bearing journal orbit analysis
- Hydro Turbines — Slow-speed shaft monitoring with DC-coupled output
- Petrochemical & Refinery Trains — SIL-rated machinery protection systems
Engineering Advantages
- Factory-Matched System — Probe, extension cable, and driver calibrated as a unit; no field linearization required
- Non-Contact Measurement — Zero mechanical wear; suitable for continuous 24/7 operation
- Wide Frequency Bandwidth — DC to 10 kHz captures sub-synchronous, synchronous, and high-frequency events
- API 670 Compliant — Drop-in replacement for existing 3300 XL installations without recertification
- Armored Cable Construction — Resistant to EMI, RFI, and mechanical damage in harsh plant environments
- Long-Term Availability — Supported by Bently Nevada’s global spare-parts ecosystem
System Architecture & Signal Flow
The PROXPAC XL assembly operates as a three-component eddy-current system:
- Probe (330881 series) — Generates a high-frequency electromagnetic field at the tip; detects changes in gap distance to the rotating shaft.
- Extension Cable — Transmits the RF signal between probe and driver with controlled impedance; length is factory-matched to maintain calibration.
- Driver / Oscillator-Demodulator — Converts the RF signal into a DC-proportional voltage output (200 mV/mil); interfaces directly with Bently Nevada 3500 or 3300 rack monitors.
Output signal connects directly to Bently Nevada 3500/40M, 3500/42M, 3500/44M, or equivalent monitor cards without additional signal conditioning.
Sourcing & Quality Verification
- Units sourced from authorized distributors, OEM surplus, and certified refurbishment channels
- Each assembly inspected for physical integrity, connector condition, and cable continuity prior to shipment
- Calibration certificates and original documentation available upon request
- Traceability records maintained for all serialized units
- Packaging: anti-static, moisture-barrier bag with foam-lined carton; ESD-safe handling throughout
Procurement Process
- Submit your RFQ via [email protected] or WhatsApp +0086 19859288691
- Receive stock confirmation, lead time, and formal quotation within 1 business day
- Issue PO — we accept T/T, L/C, and major trade-finance instruments
- Shipment via DHL / FedEx / UPS with full tracking; export documentation (CO, packing list, commercial invoice) included
- Post-delivery technical support available from our engineering team
Technical FAQ
Q: Is this assembly compatible with the Bently Nevada 3500 monitoring rack?
A: Yes. The 3300 XL PROXPAC assembly is fully compatible with 3500 series monitor cards (3500/40M, 3500/42M, 3500/44M) and 3300 series monitors.
Q: Can the cable length be customized?
A: The 155-inch total cable length is factory-set and calibration-matched. Custom lengths require a different part number to maintain calibration accuracy.
Q: What shaft materials are compatible?
A: Standard calibration is for AISI 4140 steel. Other alloys (Inconel, titanium, stainless) require a material correction factor — contact our engineering team for guidance.
Q: Do you provide calibration certificates?
A: Yes, calibration documentation is available upon request for serialized units.
Q: What is the typical lead time?
A: In-stock units ship within 2–3 business days. For out-of-stock items, lead time is quoted at RFQ stage.
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