Robust External Probe Housing for Accurate Machinery Protection
The Bently Nevada 21000-28-05-00-053-04-02 3300 XL Probe Housing Assembly is a heavy-duty external mounting solution developed to protect 3300 XL 8 mm reverse-mount proximity probes with selectable hazardous-area approvals. Built for continuous machinery condition monitoring, this housing assembly shields the probe from dust, moisture, oil, and mechanical damage while allowing easy access for probe gap adjustment and maintenance. Its rugged aluminum construction and corrosion-resistant probe sleeve make it a dependable choice for demanding industrial applications where long-term reliability is essential. The assembly is fully compatible with API 670-style vibration monitoring systems and is widely used on critical rotating equipment.
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 5.3 in. (135 mm) probe penetration, Option 04 conduit fittings, and a 3/4-14 NPT mounting thread. The medium-length probe penetration provides excellent installation flexibility for standard bearing housings while maintaining stable and accurate vibration measurements.
Product Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 21000-28-05-00-053-04-02 |
| 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 (Selectable Hazardous-Area Approvals) |
| Probe Cable Length | 0.5 m (20 in.) |
| Standoff Adapter | None (Option 00) |
| Probe Penetration | 5.3 in. (135 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 Construction |
| Compatible System | 3300 XL 8 mm Proximity Transducer System |
| Approximate Dimensions | 305 × 85 × 85 mm |
| Approximate Net Weight | 1.05 kg |
| Approximate Shipping Weight | 1.8 kg |
Typical Applications
The 21000-28-05-00-053-04-02 is designed for continuous monitoring of critical rotating machinery across a wide range of industrial sectors.
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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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 processing equipment
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Pipeline compressor stations
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Heavy industrial rotating machinery
Its 5.3-inch probe penetration makes it well suited for medium-depth bearing housings while providing excellent probe rigidity and measurement accuracy.
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, ensuring accurate shaft vibration and position monitoring while protecting the probe from harsh operating conditions.
2. Which probe is supplied with this configuration?
This model includes a 3300 XL 8 mm reverse-mount proximity probe with selectable 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 that no standoff adapter is supplied, allowing direct installation on the machine housing.
5. What does probe penetration "053" mean?
It specifies a 5.3-inch (135 mm) probe penetration length, making it suitable for medium-depth bearing housings and similar machinery designs.
6. What is included with fitting option "04"?
Option 04 includes one 3/4-14 NPT plug only, providing a straightforward conduit configuration without additional cable seal fittings.
7. Which mounting thread does this assembly use?
This model is supplied with a 3/4-14 NPT mounting thread, providing secure installation on industrial machinery.
8. What materials are used in the housing?
The housing features a cast aluminum body with a 304 stainless-steel probe sleeve, offering excellent durability and corrosion resistance.
9. Is this assembly suitable for hazardous-area installations?
Yes. The included 3300 XL 8 mm probe is available with selectable hazardous-area approvals, making it suitable for certified industrial applications when installed according to applicable standards.
10. Which industries commonly use this housing assembly?
It is widely used in oil & gas, power generation, petrochemical, mining, pulp and paper, water treatment, and other industries operating critical rotating equipment.
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