Long-Reach Probe Housing for Critical Rotating Equipment
The Bently Nevada 21000-28-05-00-064-04-02 3300 XL Probe Housing Assembly is a rugged external mounting solution engineered for 3300 XL 8 mm reverse-mount proximity probes with multiple hazardous-area approvals. Designed for continuous machinery protection, this aluminum housing assembly provides excellent environmental sealing while protecting the probe from moisture, dirt, oil, and mechanical damage. Its durable construction allows convenient probe gap adjustment and replacement without dismantling the machine, helping reduce maintenance time and improve equipment availability. The assembly is widely used in vibration monitoring and shaft position measurement systems for critical rotating assets.
This configuration includes a 3300 XL 8 mm reverse-mount proximity probe, a 0.5 m (20 in.) integral probe cable, no standoff adapter, a 6.4 in. (163 mm) probe penetration, Option 04 conduit fittings, and a 3/4-14 NPT mounting thread. The extended probe penetration makes it well suited for deeper bearing housings while maintaining stable and accurate measurements.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 21000-28-05-00-064-04-02 |
| Product Type | 3300 XL Probe Housing Assembly |
| Housing Series | 21000 |
| Housing Material | Cast Aluminum |
| Probe Sleeve Material | 304 Stainless Steel |
| Probe Included | 3300 XL 8 mm Reverse-Mount Probe (Multiple Hazardous-Area Approvals) |
| Probe Cable Length | 0.5 m (20 in.) |
| Standoff Adapter | None (Option 00) |
| Probe Penetration | 6.4 in. (163 mm) |
| Fittings | Option 04 – One 3/4-14 NPT Plug |
| Mounting Thread | 3/4-14 NPT |
| Cover Type | Threaded Dome Cover |
| Environmental Protection | O-Ring Sealed Housing |
| Compatible System | 3300 XL 8 mm Proximity Transducer System |
| Approximate Dimensions | 333 × 85 × 85 mm |
| Approximate Net Weight | 1.1 kg |
| Approximate Shipping Weight | 2.0 kg |
Typical Applications
The 21000-28-05-00-064-04-02 is designed for continuous condition monitoring of critical rotating machinery, including:
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Steam turbines
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Gas turbines
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Centrifugal compressors
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Industrial pumps
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Electric motors
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High-speed gearboxes
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Power generators
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Petrochemical process equipment
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Pipeline compressor stations
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Heavy industrial machinery
Its 6.4-inch probe penetration provides additional installation flexibility for equipment with deeper bearing housings while maintaining excellent probe stability.
Technical FAQs
1. What is the purpose of this probe housing assembly?
It provides a protected external mounting enclosure for a 3300 XL 8 mm reverse-mount proximity probe, enabling accurate shaft vibration and position monitoring while protecting the sensing components from harsh industrial environments.
2. Which probe is included?
This configuration includes a 3300 XL 8 mm reverse-mount proximity probe with multiple hazardous-area approvals (Option 28).
3. What does option "05" indicate?
Option 05 specifies a 0.5-meter (20-inch) integral probe cable.
4. What does option "00" represent?
Option 00 indicates no standoff adapter, allowing the housing to mount directly to the machine casing.
5. What does probe penetration "064" specify?
It designates a 6.4-inch (163 mm) probe penetration length for applications requiring extended reach into bearing housings.
6. What is included with fitting option "04"?
Option 04 includes one 3/4-14 NPT plug only, providing a simple conduit configuration for installations that do not require additional cable seal fittings.
7. Which mounting thread is used?
This assembly is supplied with a 3/4-14 NPT mounting thread for secure installation on industrial machinery.
8. What materials are used in the housing?
The housing is manufactured from cast aluminum with a 304 stainless-steel probe sleeve, providing excellent corrosion resistance and mechanical durability.
9. Is this assembly suitable for hazardous-area applications?
Yes. The included 3300 XL 8 mm probe features multiple hazardous-area approvals, making it suitable for certified industrial installations when used in accordance with applicable standards.
10. Which industries commonly use this model?
It is widely used in oil & gas, petrochemical, power generation, mining, pulp and paper, water treatment, and other industries operating critical rotating equipment.
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