Product Overview

The Bently Nevada 330881-28-6-155-03-02 PROXPAC XL serves as a robust, integrated housing solution designed to protect proximity transducer systems in the most demanding industrial environments. This specialized assembly combines the probe, extension cable, and Proximitor sensor into a single, environmentally sealed enclosure, significantly simplifying field installation while enhancing signal reliability. It excels in monitoring high-speed rotating assets such as steam turbines, centrifugal compressors, and cooling tower fans. By providing a ruggedized barrier against moisture, chemical exposure, and mechanical impact, the PROXPAC XL ensures that the Bently Nevada 3500 system receives high-fidelity vibration and position data, facilitating critical Emergency Shutdown (ESD) logic and real-time machinery diagnostics.

Assembly Suffix Logic

Detailed Configuration Breakdown

The alphanumeric code 330881-28-6-155-03-02 specifies the mechanical reach, probe calibration, and regional certification requirements for this integrated unit.

-28 (Probe Penetration)

Specifies a 2.8-inch probe penetration length, defining the depth at which the probe tip extends into the machine housing to reach the target shaft.

-6 (Fitting Option)

Indicates a 3/4-14 NPT conduit fitting, ensuring a secure and liquid-tight connection for the external signal wiring.

-155 (Mounting Thread)

Designates a 1.55-inch mounting thread length, providing the necessary clearance for thick-walled bearing housings or mounting manifolds.

-03 (Probe and Seal Option)

Includes a 3300 XL 8mm probe with specialized VITON seals. This material choice offers superior resistance to corrosive industrial fluids and high-temperature thermal cycling.

-02 (Agency Approval)

Features multi-certified hazardous area protection, including ATEX and IECEx ratings. This confirms the housing is intrinsically safe for deployment in explosive gas or dust atmospheres.

Mechanical and Electrical Parameters

Field Commissioning Protocol

Gap Voltage Normalization

Successful commissioning relies on precise mechanical alignment. Maintenance teams must adjust the internal probe position until the DC Gap Voltage at the Proximitor terminals reaches -10.00 VDC. This ensures the sensor is perfectly centered within its linear range. Utilize the integrated adjustment mechanism to fine-tune the gap without compromising the environmental seal of the outer housing.

Environmental Sealing and Grounding

Always verify that the VITON O-rings are seated correctly before finalizing the installation. To prevent ground loops and electromagnetic interference (EMI), ensure the housing is bonded to the machine ground while the cable shield is terminated only at the Bently Nevada 3500 monitor rack. Proper conduit sealing prevents the "wicking" of bear oil or moisture into the Proximitor electronics compartment.

Engineering Advantages

Integrated System Resilience

The 330881-28-6-155-03-02 eliminates the vulnerability of exposed coaxial connections by housing the Proximitor and extension cable leads within a single stainless steel enclosure. This design provides exceptional protection in offshore, petrochemical, and power generation environments where salt spray or synthetic lubricants would otherwise degrade external sensors.

Seamless TSI Interoperability

This assembly delivers a clean, low-noise analog signal directly to Turbine Supervisory Instrumentation (TSI) platforms. It integrates flawlessly with Honeywell Experion PKS and other high-level DCS architectures through the 3500/42M or 3500/45 monitoring modules. The PROXPAC XL provides the technical authority required for advanced diagnostic plots, including shaft centerline and orbit analysis.

Logistics and Global Fulfillment

We prioritize rapid response to support your planned outages and emergency machinery repairs.

• Dispatch Window: 3-5 days when payment finish for in-stock units.

• Worldwide Express: Secure door-to-door delivery via DHL, FEDEX, or UPS.

• Industrial Protection: Every PROXPAC XL unit is shipped in heavy-duty, anti-static industrial packaging. We utilize custom-fit structural cushioning to ensure the factory-calibrated probe tip and internal electronics remain pristine during international transit.

Technical Knowledge Base

Q1: Can I replace the internal probe without removing the entire housing?

A1: Yes, the PROXPAC XL design allows for internal probe replacement. However, you must recalibrate the gap voltage to -10.00 VDC following any sensor change to maintain system accuracy.

Q2: What is the benefit of the VITON seal option?

A2: VITON seals offer broader chemical compatibility and higher temperature resistance than standard nitrile seals, making this housing suitable for assets using aggressive synthetic bearing oils.

Q3: Does this housing include the Proximitor sensor?

A3: Most configurations include the internal Proximitor; however, the specific 3300 XL Proximitor version must match the total system length (typically 5m or 9m) specified in your site plan.

Q4: How do I verify the hazardous area rating?

A4: Check the -02 suffix on the nameplate. This indicates ATEX/IECEx certification, ensuring the assembly meets global safety standards for intrinsically safe installations in Zone 0, 1, or 2.