Compact Direct-Mount Housing for High-Performance Vibration Monitoring

The Bently Nevada 21000-28-05-00-034-04-02 3300 XL Probe Housing Assembly is an industrial-grade external mounting solution engineered for 3300 XL 8 mm reverse-mount proximity probes with selectable hazardous-area approvals. Designed for dependable machinery protection, this housing assembly safeguards the probe against contamination, moisture, vibration, and physical damage while allowing straightforward installation and precise probe adjustment. Its compact design makes it an excellent choice for rotating equipment where installation space is limited but measurement accuracy remains critical. The assembly fully supports API 670-style machinery monitoring systems and is widely installed across power generation, oil & gas, petrochemical, and heavy manufacturing facilities.

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 3.4 in. (86 mm) probe penetration, Option 04 conduit fittings, and a 3/4-14 NPT mounting thread. Option 04 supplies a single 3/4-14 NPT plug, making this model suitable for installations requiring a simplified conduit arrangement.

Technical Specifications

Technical FAQs

1. What is the primary function of this 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 sensing components from harsh industrial environments.

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" represent?

Option 05 specifies a 0.5-meter (20-inch) integral probe cable.

4. What does option "00" indicate?

Option 00 means no standoff adapter is supplied, allowing direct installation onto the machine housing.

5. What does probe penetration "034" mean?

It specifies a 3.4-inch (86 mm) probe penetration, suitable for compact bearing housing installations. Probe penetration options are ordered in 0.1-inch increments.

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 does this assembly use?

This model uses a 3/4-14 NPT mounting thread, providing secure attachment to industrial machinery.

8. What materials are used in the housing?

The housing features a cast aluminum body combined with a 304 stainless-steel probe sleeve, offering excellent mechanical strength and corrosion resistance.

9. Is this assembly appropriate for hazardous-area applications?

Yes. The included 3300 XL 8 mm probe is available with selectable hazardous-area approvals, making it suitable for certified industrial installations.

10. Which industries commonly use this model?

It is widely installed in power generation, oil & gas, petrochemical, mining, pulp and paper, water treatment, and other industries operating mission-critical rotating machinery.