Product Overview

The Bently Nevada 330881-28-04-150-06-02 PROXPAC XL is a robust, specialized transducer housing assembly designed to integrate a 3300 XL Proximitor Sensor and probe into a single, environmentally protected unit. This housing serves as the critical mechanical interface for vibration monitoring on large rotating machinery where external mounting is required. By consolidating the sensor electronics and the probe within a rugged enclosure, the PROXPAC XL provides superior protection against oil, moisture, and mechanical impact. It is the preferred choice for industrial applications involving high-performance centrifugal compressors and steam turbines, ensuring that critical vibration signals are maintained without interference from harsh ambient conditions. This assembly simplifies field wiring and drastically improves the reliability of Turbine Supervisory Instrumentation (TSI) by providing a localized, shielded environment for sensitive eddy current electronics.

Mechanical Configuration Logic

330881 - PROXPAC XL Transducer Housing

This base model represents the high-durability enclosure designed specifically to house the 3300 XL series Proximitor sensors, providing a bridge between the probe and the monitoring rack.

-28-04-150 - Dimensional Suffix Analysis

The "-28" specifies a 3/8-24 UNF probe thread mounting, while the "-04" designates the unthreaded length of the probe case in inches. The "-150" indicates the overall probe case length (15.0 inches), allowing for deep penetration through machine insulation or thick-walled casings.

-06-02 - Fitting and Approval Selection

The "-06" option defines the conduit fitting type, typically a 3/4-14 NPT or M20 arrangement for industrial cable protection. The "-02" suffix confirms multiple hazard area approvals, including ATEX and IECEx certifications, enabling the housing to be safely installed in Zone 1 and Zone 2 explosive atmospheres.

Vital Physical Specifications

Field Deployment Guidelines

When installing the 330881 PROXPAC XL, field engineers must ensure the housing is rigidly mounted to the machine casing to avoid resonance-induced vibration errors. Utilize high-quality thread sealant on the conduit entries to maintain the IP66 integrity of the enclosure. During probe gapping, perform the adjustment with the housing lid removed to monitor the Proximitor output voltage; a center-gap of -10.0 Vdc is required for optimal linear performance. Ensure the internal coaxial cable is secured and not pinched when the cover is replaced. For hazardous area installations, always verify that the grounding lug on the exterior of the housing is connected to the plant’s common grounding grid to mitigate electrostatic risks.

Strategic Engineering Advantages

The 330881-28-04-150-06-02 excels in providing "local" electronics protection, which significantly reduces the length of the sensitive integral probe cable exposed to the environment. This design minimizes EMI/RFI interference, ensuring a clean signal is transmitted back to the 3500 Machinery Protection System or Honeywell Experion PKS. The housing’s corrosion-resistant finish and heavy-duty gaskets allow it to survive in the punishing environments of offshore platforms and chemical processing plants. By centralizing the transducer components, it facilitates easier maintenance and troubleshooting, as technicians can access the Proximitor sensor directly at the machine train without entering a remote junction box.

Ordering info

• One (1) Brand New Bently Nevada 330881-28-04-150-06-02 PROXPAC XL Housing.

• Factory-sealed original industrial packaging.

• Internal mounting hardware for 3300 XL Proximitor sensor.

• Gasket and O-ring seal kit for environmental protection.

• Certificate of Conformance and installation manual.

Global Logistics & Shipping

Delivery time: 3-5 days when payment finish via DHL/FEDEX/UPS. Our logistics department utilizes double-box reinforcement and shock-absorbent anti-static materials to protect the precision threads and enclosure finish. We provide real-time tracking for every shipment, ensuring secure and timely arrival at your facility.

Technical Support FAQs

Q1: Does this housing include the Proximitor sensor and probe?

A1: The 330881 is an enclosure assembly. While it is configured for a specific probe size (-28-04-150), the 3300 XL Proximitor and probe are typically ordered separately or as part of a complete system kit.

Q2: Can I use this housing in a coastal environment?

A2: Yes. The PROXPAC XL is designed with a corrosion-resistant coating and NEMA 4X/IP66 ratings, making it highly suitable for saltwater environments and offshore oil and gas facilities.

Q3: What is the benefit of the "-02" approval option?

A3: The -02 option signifies the housing meets multiple international explosion-proof standards. This allows for a single part number to be used across global fleets, simplifying spare parts inventory for multinational companies.

Q4: How do I handle conduit condensation within the housing?

A4: We recommend installing a conduit seal and a breather/drain at the lowest point of the conduit run. This prevents moisture from migrating into the PROXPAC XL housing and damaging the internal Proximitor sensor.