Built for Compact Installations and Long-Term Machinery Reliability
The Bently Nevada 21000-28-05-35-020-04-02 3300 XL Probe Housing Assembly is a high-performance external mounting solution designed for 3300 XL 8 mm reverse-mount proximity probes used in continuous vibration and shaft position monitoring. Engineered for harsh industrial environments, this housing assembly combines a rugged aluminum body with a corrosion-resistant stainless-steel probe sleeve, providing outstanding mechanical protection while allowing convenient probe adjustment and maintenance without dismantling the monitored equipment. It is an excellent choice for critical rotating assets operating in power generation, oil & gas, petrochemical, and manufacturing facilities.
This configuration includes a 3300 XL 8 mm reverse-mount probe with selectable hazardous-area approvals, a 0.5 m (20 in.) integral probe cable, a 3.5-inch standoff adapter, a 2.0-inch (51 mm) probe penetration, Option 04 conduit fittings, and a 3/4-14 NPT mounting thread. The combination of a standoff adapter and compact probe penetration makes this model particularly suitable for applications where additional installation offset is required while maintaining precise measurement accuracy.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 21000-28-05-35-020-04-02 |
| 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 | 3.5 in. (89 mm) |
| Probe Penetration | 2.0 in. (51 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 | 242 × 24 × 241 mm |
| Approximate Net Weight | 1.0–1.1 kg |
| Approximate Shipping Weight | 1.8–2.0 kg |
Industrial Applications
The 21000-28-05-35-020-04-02 is ideal for machinery protection systems requiring accurate shaft vibration and displacement measurements.
Typical applications include:
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Steam turbines
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Gas turbines
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Centrifugal compressors
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Process pumps
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Electric motors
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High-speed gearboxes
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Turbo expanders
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Pipeline compressors
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Petrochemical processing equipment
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Power generation machinery
The 3.5-inch standoff adapter provides additional mounting flexibility where probe access is limited or increased clearance is required, while the 2.0-inch probe penetration supports compact bearing housing designs.
Technical FAQs
1. What is the purpose of this probe housing assembly?
It protects and supports a 3300 XL 8 mm reverse-mount proximity probe, allowing accurate shaft vibration and position monitoring while providing external access for maintenance and probe adjustment.
2. Which proximity probe is included?
This model includes a 3300 XL 8 mm reverse-mount proximity probe with multiple hazardous-area approvals (Option 28).
3. What does option "05" represent?
Option 05 specifies a 0.5-meter (20-inch) integral probe cable.
4. What does the "35" option indicate?
Option 35 specifies a 3.5-inch (89 mm) standoff adapter, providing additional spacing between the machine surface and the probe housing.
5. What does probe penetration "020" mean?
It designates a 2.0-inch (51 mm) probe penetration length, making it suitable for compact bearing housing applications.
6. What is included with fitting option "04"?
Option 04 includes one 3/4-14 NPT plug, offering a simple conduit configuration for standard installations.
7. Which mounting thread is provided?
The housing uses a 3/4-14 NPT mounting thread for secure installation on industrial equipment.
8. What materials are used in the housing?
The assembly features a cast aluminum housing and a 304 stainless-steel probe sleeve, delivering excellent corrosion resistance and mechanical durability.
9. Is this assembly suitable for hazardous locations?
Yes. The supplied 3300 XL 8 mm probe supports multiple hazardous-area approvals when installed according to applicable regulations.
10. Which industries commonly use this product?
It is widely installed in oil & gas, petrochemical, power generation, mining, pulp and paper, and other industries that depend on continuous monitoring of critical rotating machinery.
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