Compact Multi-Approval Probe Housing for Reliable Machinery Condition Monitoring
The Bently Nevada 21000-28-05-00-028-03-02 3300 XL Probe Housing Assembly is a rugged external mounting solution designed to protect 3300 XL 8 mm proximity probes with selectable hazardous-area approvals in demanding industrial environments. As a member of the proven 21000 Proximity Probe Housing Assembly family, this assembly combines a durable aluminum housing with a corrosion-resistant stainless-steel sleeve to provide dependable protection against moisture, dust, oil, and mechanical impact while maintaining accurate shaft vibration and position measurements. It is an ideal choice for continuous condition monitoring of mission-critical rotating equipment.
This configuration includes a 3300 XL 8 mm reverse-mount proximity probe (multiple approvals), a 0.5 m (20 in.) integral probe cable, no standoff adapter, a 2.8 in. (71 mm) probe penetration, Option 03 conduit fittings, and a 3/4-14 NPT mounting thread. Its compact design is well suited for installations where mounting space is limited while maintaining full compatibility with API 670-style machinery protection systems.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 21000-28-05-00-028-03-02 |
| Product Type | 3300 XL Probe Housing Assembly |
| Housing Series | 21000 |
| Housing Material | Aluminum Body |
| 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 | 2.8 in. (71 mm) |
| Fitting Option | Option 03 – 3/4-14 NPT Plug, Reducer & Cable Seal Grip with Grommets |
| Mounting Thread | 3/4-14 NPT |
| Cover Type | Threaded Dome Cover |
| Environmental Protection | O-Ring Sealed Construction |
| Compatible Systems | 3300 XL 8 mm Proximity Transducer Systems |
| Typical Housing Dimensions | Configured according to penetration length |
| Typical Net Weight | Approx. 1.1 kg (without fittings) |
| Approximate Shipping Weight | 2.0 kg |
Typical Applications
The 21000-28-05-00-028-03-02 is designed for continuous machinery monitoring in demanding industrial facilities.
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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Gearboxes
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Process fans and blowers
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Petrochemical processing units
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Power generation plants
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Pipeline compressor stations
Its compact probe penetration makes this assembly an excellent solution for machinery with limited installation depth while maintaining accurate vibration monitoring performance.
Technical FAQs
1. What is the purpose of the 21000-28-05-00-028-03-02 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 system from harsh environmental conditions.
2. Which probe is included?
This configuration includes a 3300 XL 8 mm 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 no standoff adapter, allowing the housing to mount directly to the machine surface.
5. What does option "028" specify?
Option 028 designates a 2.8-inch (71 mm) probe penetration length, suitable for compact machinery installations. Probe penetration options are specified in 0.1-inch increments.
6. What is included with fitting option "03"?
Option 03 includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and one cable seal grip with interchangeable grommets for multiple cable diameters.
7. Which mounting thread is provided?
This assembly uses a 3/4-14 NPT mounting thread, providing a secure installation for industrial machinery.
8. What materials are used in the housing?
The housing is constructed from aluminum with a 304 stainless-steel probe sleeve, providing excellent mechanical strength and corrosion resistance.
9. Is this assembly suitable for hazardous locations?
Yes. The included 3300 XL 8 mm probe features selectable hazardous-area approvals, making it suitable for installations requiring certified sensing equipment.
10. Which industries commonly use this probe housing?
It is widely used in oil & gas, petrochemical, power generation, mining, pulp and paper, water treatment, and other industries operating critical rotating machinery.
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