Product Overview

The 330881-28-00-095-05-01 is a PROXPAC XL Proximity Transducer assembly manufactured by Bently Nevada. This integrated solution combines a 3300 XL 8 mm proximity probe and a Proximitor sensor into a single, ruggedized housing, specifically designed for industrial environments where a separate Proximitor mounting is impractical. This unit serves as an essential component for monitoring radial vibration, axial thrust, or Keyphasor signals on rotating machinery within 3500 or 3300 Machinery Protection Systems. This specific configuration features a 95 mm probe penetration, M24 X 3 mounting threads, and a specialized fitting kit (PG21 to PG11 reducer). The PROXPAC XL is engineered to simplify installation while providing the high-precision eddy-current measurement standard across the 3300 XL series.

Technical Configuration

The PROXPAC XL assembly replaces the traditional probe-extension cable-sensor chain with a localized enclosure.

• Integrated Design: Houses both the transducer probe and the signal conditioning electronics in one weather-resistant assembly.

• Probe Type: 3300 XL 8 mm probe, calibrated for standard AISI 4140 steel.

• Mechanical Interface: M24 X 3 metric mounting thread with a 95 mm penetration depth (C Dimension).

• Housing: Robust enclosure providing environmental protection for the internal Proximitor sensor.

Technical Specifications

Ordering Information

When sourcing spare parts for the PROXPAC XL system, the penetration depth (C Dimension) and mounting thread must be verified against the original machine drawings to ensure physical fit.

• Part Number: 330881-28-00-095-05-01

• Probe Lead Length: Integrated (Matches internal sensor calibration)

• Approvals Code: 28 (Multiple Approvals including ATEX/IECEx/CSA)

Engineering & Installation Guide

The PROXPAC XL simplifies the installation loop but requires precise mechanical alignment for accurate data.

• Penetration Adjustment: The 95 mm penetration depth is fixed based on the part number. Fine-tuning the gap must be done during the initial installation by rotating the housing or utilizing shims if a standoff was not selected.

• Field Wiring: Use the supplied PG21 to PG11 reducer to ensure proper cable gland fitment. Use shielded twisted pair cable (typically 18 to 22 AWG) for the connection between the PROXPAC and the monitor rack.

• Grounding: The internal Proximitor is isolated from the housing. Ensure the shield is grounded at the monitor rack to prevent ground loops and RFI interference.

• Mechanical Torque: Tighten the mounting thread to the machine casing securely. Loose mounting can introduce mechanical resonance, which the probe will incorrectly interpret as shaft vibration.

• Target Material: If the shaft material is not AISI 4140, the output scale factor (7.87 V/mm or 200 mV/mil) will be invalid.

• Cabling Impedance: The system is designed for 75 ohm impedance to ensure signal accuracy over long distances (refer to image_3b1f79.png).

FAQ

• Can the internal probe be replaced separately?

  Yes, the 330881 series allows for the internal 3300 XL probe to be replaced if the tip is damaged, though the probe length must match the internal sensor's calibration.

• What is the benefit of "Multiple Approvals" (Option 28)?

  Option 28 provides a broad range of certifications (Hazardous Area), making the unit suitable for global deployment where different regional safety standards apply.

• Does this unit require an external Proximitor?

  No, the Proximitor electronics are built into the PROXPAC XL housing. You only need to provide -24 Vdc power and receive the signal at the monitor.