Bently Nevada 330881-BR-04-70-03-02 PROXPAC XL Proximity Transducer

Description

330881-BR-04-70-03-02 specifies a metric configuration of the Bently Nevada PROXPAC XL Proximity Transducer, integrating an 8 mm probe with multiple hazardous area approvals (Option BR) into a self-contained protective assembly. This integrated setup couples a 3300 XL 8 mm probe and a 3300 XL Proximitor sensor within a single, machine-mounted polyphenylene sulfide (PPS) housing. This engineering approach eliminates the need for external extension cables and standalone Proximitor enclosures, allowing field wiring to run directly from the housing to the monitoring system.

For precise mechanical adjustment and alignment, this variant features a 40 mm standoff adapter (Option 04) and a 70 mm probe penetration length (Option 70). Environmental integrity is maintained by the glass-and-conductive-fiber-reinforced PPS body, which effectively dissipates electrostatic charges and is rated for IP66 and NEMA Type 4X environments. This specific metric configuration is supplied with one M20 fitting and two blanking plugs (Option 03) for electrical conduit entry, and utilizes a 3/4-14 NPT thread (Option 02) for secure mounting to the machine casing.

Features

• Integrated Assembly Design: Combines a 3300 XL 8 mm probe and Proximitor sensor inside a single enclosure, eliminating separate extension cables and dedicated remote transmitter housings.
• Multiple Hazardous Area Approvals: Option BR (the designator corresponding to Option 28 in Bently Nevada metric documentation) certifies the assembly for ATEX, IECEx, and CSA hazardous area classifications.
• Adjustable Depth: Includes a 70 mm probe penetration sleeve (Option 70) and a 40 mm standoff adapter (Option 04) for precise positioning of the sensor tip.
• Corrosion-Resistant PPS Housing: Molded thermoplastic reinforced with glass and conductive fibers provides robust chemical, UV, and impact resistance alongside electrostatic dissipation.
• IP66 and Type 4X Ratings: Engineered for direct machine mounting in severe industrial environments, offering high protection against moisture, dust, and washdowns.
• Secure Conduit Entries: Includes one M20 connection fitting and two plugs (Option 03) to prevent environmental ingress at the cable entry ports.

Applications

The system is used for continuous, non-contact shaft vibration and axial position measurements in rotating machinery. Typical applications include:

• Steam turbines and gas turbines in power generation plants.
• Centrifugal compressors and pumps in oil, gas, and petrochemical facilities.
• Large industrial fans, blowers, and gearboxes.
• Severe-duty or space-constrained locations where remote Proximitor housings cannot be easily installed.

Ordering Information

Technical Specifications

Installation Guidelines

• Field Grounding: The internal grounding liner and retaining plate must be connected properly. Ground the field wiring shield exclusively at the monitor end to eliminate potential ground loop interference.
• Thread Integrity: Use the 3/4-14 NPT mounting thread to engage with the machine casing. Apply the standard torque of 39.3 N-m (350 in-lb) on the locknut and 29.5 N-m (260 in-lb) on the retaining nut.
• Calibration Target Gap: Set the recommended gap distance to 1.27 mm (50 mils) to establish the -10 Vdc nominal center bias voltage within the 2 mm linear measurement window.
• Conduit Entries: Securely thread the supplied M20 fitting. Plug all unused entry ports using the supplied blanking plugs to preserve the IP66 and NEMA Type 4X environmental seal.

Compliance and Certifications

• CE Mark: Yes
• Ingress Protection: IP66 (verified by BASEEFA) and NEMA Type 4X
• Hazardous Area Approvals (Option BR): ATEX, IECEx, and CSA certified for Class I Division 1 (Groups A, B, C, D) and Ex ia IIC T4/T5 Ga intrinsically safe applications when installed per Bently Nevada drawing 141092.