Description

Option 28 (3300 XL 8 mm probe with Multiple Approvals) and Option 20 (2.0 in standoff adapter) specify the exact mechanical and electrical layout of this 330880-28-20-038-00-02 integrated PROXPAC XL Proximity Transducer assembly. This design integrates a 3300 XL 8 mm proximity probe and its matching 1-metre Proximitor sensor directly into a single, robust housing cover. By consolidating these components, the assembly eliminates the need for separate extension cables and dedicated Proximitor housings. The field wiring connects directly inside the terminal compartment of the transducer housing, significantly simplifying system design, decreasing connector-related signal losses, and reducing overall installation costs.

This configuration is built with an Option 038 probe penetration length of 3.8 inches (97 mm) and is supplied under Option 00 (no conduit fittings; includes two sleeve plugs and two washers). It utilizes Option 02, providing a 3/4-14 NPT outer sleeve mounting thread to secure the unit to the machinery casing. The housing itself is molded from a high-durability, UV-resistant, glass-reinforced polyphenylene sulfide (PPS) thermoplastic embedded with conductive fibers to dissipate static charges. Sibling configurations within this family vary by offering metric mounting threads, different standoff adapter lengths, or pre-packaged conduit fittings, making this specific English-threaded, 3.8-inch penetration unit the ideal configuration for standardized medium-depth machine cases.

Features

• Option 28 Probe Integration: Features a pre-installed 3300 XL 8 mm proximity probe with Multiple Approvals (CSA, ATEX, IECEx) for hazardous area conditions.
• Option 20 Standoff Length: Includes a 2.0 in (51 mm) standoff adapter to adjust probe positioning relative to the target shaft.
• Option 038 Sleeve Penetration: Outfitted with a 3.8 in (97 mm) probe sleeve length suitable for medium-depth machine case penetration.
• Option 00 Fittings Package: Shipped without external conduit fittings, containing instead two plastic plugs and two washers for standard sealing.
• Option 02 Mounting Thread: Utilizes a standard 3/4-14 NPT outer sleeve thread to secure the standoff adapter.
• Glass-Reinforced PPS Housing: Constructed from advanced molded thermoplastic containing conductive fibers to strengthen the outer shell and prevent electrostatic hazards.
• Self-Contained Design: Minimizes cable management overhead by housing both probe and sensor elements in a single IP66 and Type 4X rated enclosure.

Applications

• Radial vibration and axial position monitoring on high-speed rotating shafts in steam turbines, gas turbines, and compressors.
• Simplified field installations where separate Proximitor enclosures are impractical due to physical layout constraints.
• Corrosive or highly humid industrial environments, including petrochemical refineries, power plants, and gas processing facilities.
• Direct integration with Bently Nevada 3500 and 3300 machinery protection monitors.

Ordering Information

Technical Specifications

Installation Guidelines

• Gap Adjustment: The threaded sleeve design allows for a mechanical adjustment of +/- 12.7 mm (+/- 0.5 in) from the nominal insertion point. Ensure the probe is gapped to the standard 1.27 mm (50 mils) before securing.
• Required Torque: Tighten the housing retaining nut to 29.5 N-m (260 in-lb) and the outer probe sleeve locknut to 39.3 N-m (350 in-lb) to maintain a secure process seal.
• Conduit Sealing: Users must seal all conduit entries to prevent moisture from traveling through the field conduit into the main terminal compartment. Tighten the lid screws properly to maintain Type 4X and IP66 protection.
• Electrostatic Grounding: Ensure the internal metallic grounding liner and plate are properly integrated into the system ground loop to effectively dissipate electrostatic charges.

Compliance and Certifications

• North American (CSA): Class I, Zone 0: AEx/Ex ia IIC T4/T5 Ga; Class I, Division 2, Groups A, B, C, and D.
• ATEX/IECEx: Ex ia IIC T4/T5 Ga; Ex ia IIIC T90C/T105C Dc; Ex nA IIC T4/T5 Gc; Ex ec IIC T4/T5 Gc.
• CE Mark: Complies with European Community Directive EMC 2014/30/EU and RoHS Directive 2011/65/EU.
• Ingress Protection: Rated for Type 4X and IP66 environments.