Product Overview

The Bently Nevada 330881-28-05-090-00-02 PROXPAC XL represents a sophisticated integration of the industry-leading 3300 XL 8mm proximity probe and Proximitor sensor into a single, ruggedized housing. This assembly eliminates the need for separate extension cables and external Proximitor mountings, drastically reducing installation complexity in high-density machinery environments. It excels in monitoring radial vibration and axial position on smaller turbines, pumps, and fans where space is a premium but high-precision machinery protection is non-negotiable.

By housing the electronics directly within the probe mounting, the PROXPAC XL minimizes signal degradation and simplifies the interface with Bently Nevada 3500 racks or local DCS controllers. This "all-in-one" design provides the same 200 mV/mil scale factor accuracy as standard systems while offering enhanced mechanical protection against oil, moisture, and physical impact. It stands as a critical asset for reliability engineers seeking to streamline their Turbine Supervisory Instrumentation (TSI) footprint without compromising on data integrity.

Hardware Matrix and Suffix Decoding

The specific configuration of this PROXPAC XL unit is defined by its alphanumeric suffixes, tailored for precise mechanical fitment:

330881 [Model Series]

PROXPAC XL Transducer Assembly utilizing 3300 XL 8mm sensor technology.

-28 [Probe Case Thread]

Specifies a 3/8-24 UNF thread pattern for the probe case, ensuring compatibility with standard North American industrial mounting ports.

-05 [Unthreaded Length]

Defines a 0.5-inch unthreaded portion of the probe case. This provides the necessary clearance for thick-walled machine housings while maintaining structural rigidity.

-090 [Overall Case Length]

Indicates a 9.0-inch total case length. This dimension allows the probe tip to reach deep-seated shaft targets through complex bearing pedestals.

-00 [Armor/Mounting Option]

Standard mounting configuration without specialized flexible armor, optimized for installation within rigid conduit systems.

-02 [Agency Approval]

Full ATEX/IECEx/CSA certification for hazardous area deployment. This allows the unit to operate safely in Zone 0, 1, or 2 environments when used with appropriate intrinsic safety barriers.

Operational Specifications

Field Commissioning Insights

Proper mechanical gapping is fundamental to the accuracy of the PROXPAC XL. Engineers should utilize a digital multimeter to measure the gap voltage between the 'SIG' and 'COM' terminals. A reading of -10.0 VDC typically places the probe at the midpoint of its linear range, providing equal headroom for both positive and negative vibration excursions.

Grounding is critical: the PROXPAC XL housing must be electrically isolated from the machine casing to prevent ground loops that introduce noise into the vibration signal. Use the provided isolation washers and ensure the internal shielding terminates only at the monitoring rack. For hazardous area installations, always verify that the barrier parameters (Uo, Io, Po) match the entity parameters listed in the Bently Nevada certificates.

Advanced Engineering Benefits

The PROXPAC XL provides a seamless bridge to existing DCS infrastructures like Honeywell Experion PKS through its high-fidelity analog output. Its integrated design significantly reduces "signal-to-noise" ratios by shortening the high-impedance path between the probe coil and the Proximitor circuitry.

This unit is specifically hardened against "thermal drift," maintaining a stable DC gap voltage even as machine skin temperatures fluctuate during startup cycles. This stability is vital for axial thrust measurements where thermal expansion could otherwise be misinterpreted as shaft movement, triggering a false machine trip.

Fulfillment and Logistics Management

We ensure your critical protection hardware is delivered with peak industrial care:

Dispatch Velocity: Ships within 3-5 days when payment finish, utilizing prioritized air freight through DHL, FEDEX, or UPS.

Global Compliance: Full export documentation provided, including Certificates of Origin and factory calibration reports.

Protective Handling: Every PROXPAC unit is vacuum-sealed in anti-static industrial packaging and supported by custom-molded shock-absorbing inserts to ensure the internal ceramics remain intact during global transit.

Technical Validation FAQ

Q1: Can I replace the internal probe if the tip is damaged?

A1: The PROXPAC XL is designed as an integrated assembly to ensure factory-calibrated accuracy. While some components are serviceable, Bently Nevada recommends replacing the assembly or returning it to an authorized center to maintain the ±5% Incremental Scale Factor (ISF) tolerance.

Q2: Does the -02 approval cover both Dust and Gas environments?

A2: Yes, the -02 suffix provides comprehensive multi-agency approvals for both explosive gas (Group IIC) and combustible dust (Group IIIC) atmospheres, making it suitable for chemical plants and mills alike.

Q3: How does the PROXPAC XL handle signal transmission distance?

A3: Since the Proximitor is built-in, the output is a low-impedance voltage signal. This allows for cable runs up to 305 meters (1,000 feet) between the PROXPAC XL and the 3500 rack without significant signal attenuation, provided high-quality shielded twisted-pair cabling is used.