Overview

The Bently Nevada 24701-28-05-20-040-03-02 is a specialized industrial enclosure designed for the secure installation and protection of reverse-mount proximity probes. Constructed from high-durability 303 and 304 stainless steel, this assembly facilitates precise probe penetration into machinery casings while maintaining environmental sealing via high-grade O-rings and thread seals. It is specifically configured for the 3300 XL 8mm probe series, providing a robust interface for critical vibration monitoring systems.

Configuration Breakdown & Suffix Logic

• 24701 — Base Model: Proximity Probe Housing Assemblies
  • └─ 28: Probe Option (3300 XL 8mm, with approval)
  •    └─ 05: Cable Length (0.5m / 20 in)
  •       └─ 20: Standoff Adapter (2.0 in)
  •          └─ 040: Probe Penetration (4.0 in)
  •             └─ 03: Fittings (NPT Plug, Reducer & Cable Seals)
  •                └─ 02: Mounting Thread (3/4-14 NPT)

Engineering Specifications

• Material Composition: 303 Stainless Steel body with 304 Stainless Steel sleeve.
• Weight Profile: 1.8 kg (4.1 lb) typical (base unit without fittings).
• Maximum Reach: Combined (C) + (D) dimension up to 13.5 in (34.3 mm).
• System Components: Includes dome cover, threaded conduit ports, probe sleeve, O-rings, and thread seals.
• Environmental Rating: Heavy-duty sealing designed for high-vibration machinery casings.

Selection & Installation Guidance

• Probe Compatibility: Specifically machined for Bently Nevada 3300 XL 8mm reverse-mount probes.
• Mounting Requirement: Option 02 (3/4-14 NPT) is mandatory when using standoff adapters to ensure mechanical stability.
• Internal Protection: The internal sleeve shields the probe from oil, debris, and high-velocity fluid flow within the machine.

Logistics & Warranty Terms

• Quality Assurance: Covered by a 12-Month Factory Warranty.
• Condition: Brand New & Original in factory-sealed packing.
• Express Delivery: Global shipping available via FedEx, UPS, and DHL for minimal downtime.

Expert Knowledge Base (FAQ)

• Why is the 24701-28-05-20-040-03-02 housing essential for vibration monitoring?
  It provides a pressure-tight environment, ensuring that the 3300 XL probe remains accurately positioned relative to the shaft even under extreme casing pressure.
• What is the purpose of the “Standoff Adapter” (Option 20)?
  The 2.0-inch standoff allows the probe housing to clear external machine insulation or cooling jackets, providing better accessibility for wiring.
• Can I adjust the penetration depth after purchase?
  No, the 4.0-inch penetration (Option 040) is fixed. Engineering must verify the “Case-to-Shaft” distance before ordering this specific configuration.
• How do the included grommets in the “03” fitting option help?
  The kit includes three grommet sizes (1/8″ to 3/8″), allowing you to create a liquid-tight seal regardless of the specific armored cable diameter used.
• Is this assembly suitable for hazardous area installations?
  Yes, the “28” probe option includes the approval-ready configuration, though the overall site safety depends on using the correct conduit seals and NPT plugs provided in the kit.