Bently Nevada 330881-28-20-040-03-02 PROXPAC XL Proximity Transducer

Description

330881-28-20-040-03-02: Metric PROXPAC XL Proximity Transducer assembly featuring a 3300 XL 8 mm proximity probe with Multiple Approvals, a 200 mm standoff adapter, a 40 mm probe penetration depth, a single M20 fitting option, and a 3/4-14 NPT mounting thread.

This integrated design combines the transducer probe and the 3300 XL Proximitor sensor into a single Polyphenylene Sulfide (PPS) thermoplastic housing. By housing the Proximitor directly at the measurement point, this assembly eliminates the need for a separate extension cable and external Proximitor enclosure, allowing field wiring to connect directly from the machinery monitor. The PPS plastic housing is glass- and conductive-fiber-reinforced to provide electrostatic charge dissipation and is rated for Type 4X and IP66 severe environments.

Features

• Option 28 integrates a 3300 XL 8 mm proximity probe with multiple international hazardous area certifications (CSA, ATEX, IECEx).
• Option 20 provides a 200 mm standoff adapter constructed of stainless steel.
• Option 040 defines a 40 mm probe penetration depth for insertion into the machine casing.
• Option 03 includes a single M20 fitting kit with two blanking plugs to seal unused conduit entries.
• Option 02 provides a 3/4-14 NPT mounting thread, which is required for the standoff adapter installation.
• Integrated Proximitor sensor design removes the need for high-frequency coaxial extension cables, reducing installation labor.
• Polyphenylene Sulfide (PPS) housing construction offers high impact strength and resistance to corrosive process fluids.

Applications

The PROXPAC XL assembly is used for non-contact shaft vibration and axial position measurements on rotating machinery such as steam turbines, gas turbines, compressors, pumps, and gearboxes. It is suitable for applications where space is limited, hazardous area certifications are required, or where eliminating separate extension cables and external Proximitor housings reduces overall installation complexity and maintenance overhead.

Ordering Information

Technical Specifications

Installation Guidelines

• Grounding: Ensure proper grounding continuity through the internal grounding liner and retaining plate. Run field wiring with high-quality 3-conductor shielded cable and tie down the drain wire appropriately.
• Probe Gapping: Set the initial probe gap to the recommended 1.27 mm (50 mils) to center the measurement within the linear range of -1 Vdc to -17 Vdc.
• Torque Limits: Tighten the retaining nut to 29.5 N-m (260 in-lb). Torque the probe sleeve locknut to 39.3 N-m (350 in-lb) to maintain secure placement and casing seals.
• Mechanical Bracing: Since the combined standoff ("B" dimension) and penetration ("C" dimension) lengths total 240 mm, ensure the probe sleeve is properly supported if subjected to heavy system vibration or if adjacent piping exerts physical resonance.
• Moisture Control: Seal all unused electrical entries on the PPS housing using the supplied blanking plugs. Ensure that conduit paths do not carry moisture from the exterior environment into the terminal box.

Compliance and Certifications

• CE Mark: Complies with European EMC Directive 2014/30/EU (EN 61000-6-2 and EN 61000-6-4 standards).
• RoHS: Complies with European Community Directive 2011/65/EU.
• Hazardous Area Approvals (Option 28): Certified for intrinsically safe and non-incendive installations under CSA (Class I, Div 1 & 2, Groups A, B, C, D) and ATEX/IECEx (Ex ia IIC T5...T1 Ga, Ex nA IIC T5...T1 Gc, Ex ec IIC T5...T1 Gc).
• Marine Certifications: Approved in accordance with standard rules for offshore structures and marine conditions.