Compact Standoff Probe Housing for Precise Shaft Monitoring

The Bently Nevada 21000-28-05-35-028-00-02 3300 XL Probe Housing Assembly is a high-quality external mounting solution designed for 3300 XL 8 mm reverse-mount proximity probes with selectable hazardous-area approvals. Engineered for continuous machine condition monitoring, this housing assembly combines a durable aluminum body with a precision-machined stainless-steel probe sleeve to deliver dependable protection against moisture, dust, oil, and mechanical impact. Its modular design allows technicians to adjust or replace the probe without removing the machine from service, helping reduce maintenance downtime and improve asset reliability. It is widely deployed in API 670-compliant machinery protection systems across critical industrial facilities.

This configuration includes a 3300 XL 8 mm reverse-mount proximity probe, a 0.5 m (20 in.) integral probe cable, a 3.5-inch (89 mm) standoff adapter, a 2.8-inch (71 mm) probe penetration, no conduit fittings (Option 00), and a 3/4-14 NPT mounting thread. The integrated standoff adapter provides additional installation clearance while maintaining excellent probe stability and measurement accuracy.

Engineering Specifications

Technical FAQs

1. What is the purpose of this probe housing assembly?

It provides a secure external enclosure for a 3300 XL 8 mm reverse-mount proximity probe, protecting the probe while enabling precise shaft vibration and position monitoring.

2. Which probe is included?

The assembly includes a 3300 XL 8 mm reverse-mount 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 the "35" option indicate?

Option 35 identifies a 3.5-inch (89 mm) standoff adapter, providing additional spacing between the machine casing and the housing assembly.

5. What does probe penetration "028" mean?

It specifies a 2.8-inch (71 mm) probe penetration length, making the assembly suitable for shallow-to-medium bearing housing installations.

6. What does fitting option "00" include?

Option 00 means the housing is supplied without conduit fittings, allowing users to install fittings that best match their application requirements.

7. Which mounting thread is used?

The housing uses a 3/4-14 NPT mounting thread, providing a secure and rigid installation.

8. What materials are used in the housing?

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

9. Is this assembly suitable for hazardous-area installations?

Yes. The supplied 3300 XL 8 mm probe supports selectable hazardous-area approvals when installed in accordance with applicable regulations.

10. Which industries commonly use this model?

It is widely used in oil & gas, petrochemical, power generation, mining, pulp and paper, and other industries requiring continuous monitoring of critical rotating equipment.