Bently Nevada 330881-28-04-70-03-02 PROXPAC XL Proximity Transducer

Description

Option 28 (multiple approvals 3300 XL probe) and Option 03 (one M20 fitting) specify this metric PROXPAC XL configuration — 330881-28-04-70-03-02. This metric-threaded PROXPAC XL Proximity Transducer assembly is equipped with a 40 mm standoff adapter (Option 04), a 70 mm probe penetration length (Option 70), and a 3/4-14 NPT mounting thread (Option 02).

This integrated assembly combines a 3300 XL 8 mm proximity probe and its associated 3300 XL Proximitor sensor directly into a single glass-reinforced polyphenylene sulfide (PPS) thermoplastic enclosure. By eliminating the necessity for a separate Proximitor sensor housing or an external extension cable, the 330881 system significantly simplifies industrial field installation, reduces wiring complexity, and forms a durable, self-contained eddy-current measurement system. The metric 330881 variant relies on metric conduit fittings (M20 or M25) and metric probe sleeve adjustments, distinguishing it from English-threaded 330880 models.

Features

• Option 28 probe and approvals: Integrates a 3300 XL 8 mm proximity probe certified with multiple hazardous area approvals.
• Option 04 standoff: Features a 40 mm standoff adapter to adjust probe positioning.
• Option 70 penetration: Provides a 70 mm probe penetration depth.
• Option 03 conduit fitting: Includes one M20 conduit fitting and two blanking plugs for secure cable routing.
• Option 02 mounting thread: Uses a standard 3/4-14 NPT mounting thread for standoff adapter engagement.
• Integrated Proximitor: Houses a 1-metre 3300 XL Proximitor sensor directly in the housing lid, eliminating separate extension cables.
• Advanced PPS housing: Molded glass-reinforced polyphenylene sulfide housing provides chemical resistance and static dissipation.
• High environmental protection: Enclosure is rated for Type 4X and IP66 environments.

Applications

• Used for non-contact shaft vibration and axial position measurements on rotating machinery.
• Ideal for severe industrial environments including oil and gas facilities, petrochemical plants, and power generation turbines.
• Simplifies installation in locations where mounting separate Proximitor sensors in external enclosures is impractical or costly.

Ordering Information

Technical Specifications

Connections and Interfaces

Field wiring connects directly inside the PROXPAC XL enclosure to the integrated terminal block, eliminating the need for an external extension cable. Terminal block interface specifications:

• Wire Size Compatibility: 0.2 to 1.5 mm2 (16 to 24 AWG)
• Recommended Cable: 3-conductor twisted shielded cable with drain wire
• Maximum Distance: Up to 305 metres (1000 feet) to the monitoring system

Installation Guidelines

• Mounting: Mount the assembly via the 3/4-14 NPT outer thread (Option 02) onto the machine casing. Use the standoff adapter to adjust the probe positioning relative to the target surface.
• Probe Gap: Set the initial probe gap to approximately 1.27 mm (50 mils) corresponding to -10.0 Vdc output at the center of the linear range.
• Sleeve Adjustment: The threaded sleeve allows +/-12.7 mm (+/-0.5 in) of adjustment to achieve the correct gap during installation.
• Condensation Control: Seal all conduit entries with the provided blanking plugs or conduit fittings. Ensure that field wiring cables loop downward before entering the enclosure to prevent moisture from running into the housing through the conduit.

Compliance and Certifications

• CE Mark: Complies with European CE directives.
• IP Rating: IP66 and Type 4X rating verified for environmental seal.
• Hazardous Area Approvals: Option 28 probe is certified with multiple international hazardous area agency approvals (including ATEX, IECEx, and CSA) for intrinsically safe installations.