Description

The Bently Nevada 330801-28-04-050-00-02 belongs to the legacy PROXPAC Proximity Transducer Assembly series. Unlike separate proximity probes that require independent extension cables, this system acts as a completely self-contained solution. It integrates a 3300 XL 8 mm proximity probe and its matching Proximitor sensor directly into a single, protective engineering thermoplastic housing.

Suffix Part Number Breakdown

The specific option strings map directly to the following structural specifications:

• 330801: Base Model Number for the PROXPAC Proximity Transducer Assembly (Metric).
• 28: 3300 XL 8 mm probe with Multiple Approvals.
• 04: 40 mm Standoff Adapter length option.
• 050: 50 mm Probe Penetration length.
• 00: No fittings configuration (includes two plugs and two washers).
• 02: 3/4-14 NPT mounting thread option (required when using a standoff adapter).

Hardware Specifications

Material Design and TSI Characteristics

The advanced housing consists of a high-strength Polyphenylene Sulfide (PPS) thermoplastic matrix embedded with glass fibers and conductive carbon filaments. Consequently, this engineering choice provides elite physical impact resistance while safely dissipating stray electrostatic charges.

Because the housing cover protects the integrated Proximitor sensor directly at the measurement point, it eliminates the need for an external extension cable loop. This design minimizes high-frequency RF attenuation and removes the vulnerability of exposed coaxial connections inside harsh, oil-misted machinery enclosures. The assembly connects directly to field wiring terminal blocks, routing a clean analog voltage output to a remote monitoring rack.

Frequently Asked Questions

Q: What is the main structural purpose of the 40 mm standoff adapter (-04 option)?

A: The 40 mm standoff adapter provides a precise physical offset from the machine’s outer casing wall. This allows operators to fine-tune the exact penetration depth of the probe tip relative to internal target surfaces without modifying the machine casing.

Q: Can technicians swap internal components if the probe tip becomes damaged?

A: Yes, the assembly allows mechanical adjustment and probe replacement. However, because the system relies on matched electrical lengths inside the housing to maintain calibration, technicians must replace the internal probe with an identical 3300 XL component to protect output accuracy.

Field Installation Guidelines

• Thread the main 3/4-14 NPT base into the pre-drilled machine housing port, ensuring a tight seal to maintain the case pressure boundary.
• Next, adjust the probe sleeve location until the probe tip establishes the recommended mechanical gap relative to the shaft target.
• Subsequently, feed your field instrumentation wiring through the housing conduit entry ports directly into the internal terminal block connection points.
• After that, tighten the housing cap screws firmly to compress the integrated perimeter seal, ensuring the container satisfies IP66 weather-tight ratings.
• Finally, supply a stable negative DC power source to the unit, and verify that the initial un-gapped output voltage reads within the linear calibration midpoint (typically -10 VDC).