Product Overview
The Bently Nevada 21000-28-00-00-050-04-02 is a rugged Proximity Probe Housing Assembly designed to protect and position a 3300 XL 8 mm proximity probe in demanding industrial environments. This assembly combines an aluminum body with a 304 stainless steel sleeve, ensuring durability and corrosion resistance. With a probe penetration of 5 inches and a 3/4-14 NPT mounting thread, this unit is ready for installation in machinery where precise vibration and displacement monitoring is critical.
Part of the trusted 21000 series, this housing is certified as a CSA Type 4 enclosure and fully complies with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings. It is rated explosion proof for hazardous areas, making it suitable for oil, gas, and petrochemical applications.
Key Specifications
| Specification |
Detail |
| Probe Type |
3300 XL 8 mm probe with selectable hazardous area approvals |
| Probe Cable Length |
Not required (option 00) |
| Standoff Adapter Length |
None (option 00) |
| Probe Penetration (Option D) |
5 inches (050) |
| Fittings Option |
One 3/4-14 NPT plug (option 04) |
| Mounting Thread |
3/4-14 NPT (option -02) |
| Housing Material |
Aluminum body with 304 stainless steel sleeve |
| Maximum (C)+(D) Dimension |
13.5 in (34.3 cm) with 0.5 m probe cable (probe P/N and S/N not visible) |
| Weight |
1.1 kg (2.4 lb) typical, without fittings |
Construction and Contents
The 21000-28-00-00-050-04-02 housing assembly includes a dome cover that screws into the body, threaded ports for conduit connections, a probe sleeve of optional length, O-rings, a reverse mount proximity probe, a thread seal, optional conduit fittings, and an optional standoff adapter. This comprehensive design ensures a secure and reliable mounting solution for the proximity probe.
Applications
This housing assembly is ideal for rotating machinery monitoring, including turbines, compressors, pumps, and generators. It provides accurate shaft vibration and position measurements, enabling predictive maintenance and reducing unplanned downtime. The explosion-proof rating and CSA Type 4 certification make it suitable for hazardous area installations in refineries, chemical plants, and other industrial facilities.
For probe penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may be necessary to reduce side or rear view effects. For penetrations greater than 300 mm (12 in), sleeve support near the probe is required to prevent resonance. The adjustment range for the probe penetration option D is 13 mm (±0.5 in).
Installation Guidance
When installing the 21000-28-00-00-050-04-02, ensure the mounting thread (3/4-14 NPT) is clean and properly sealed. Use the provided 3/4-14 NPT plug for any unused conduit ports. Verify that the probe penetration depth is set correctly per your machine's requirements. For optimal performance, follow the manufacturer's guidelines for cable routing and conduit connections.
Maintenance and Reliability
Regularly inspect the housing for signs of wear, corrosion, or loosening. Check all O-rings and seals for integrity to maintain the explosion-proof rating. Keep the probe tip clean and free from debris to ensure accurate measurements. With proper care, this housing assembly provides long-term reliability and consistent performance.
Selection Guide
Before ordering, verify that the probe penetration (5 inches) and mounting thread (3/4-14 NPT) match your application requirements. If you need a different configuration, consult the ordering code to select the appropriate options. PLC Source PRO offers this new, original Bently Nevada 21000-28-00-00-050-04-02 with a 12-month factory warranty and reliable global shipping.