Bently Nevada 21000-28-10-20-050-04-02 Proximity Probe Housing Assembly

Technical Specifications Breakdown

Key parameters for the 21000-28-10-20-050-04-02 are listed below for quick reference:

Industry Applications for the 21000 Housing Assembly

This housing is purpose-built for externally mounted proximity probes on rotating equipment such as compressors, turbines, and pumps. The CSA Type 4 enclosure rating and explosion-proof certification make it suitable for Class I Division 1 and 2 Groups C and D, as well as Class II Division 1 and 2 Groups E, F, and G environments. The assembly fully complies with API 670 Standard for externally mounted proximity probe housings, ensuring reliable vibration and position monitoring in refineries, chemical plants, and gas processing facilities.

Installation & Setup Guidance

When installing the 21000-28-10-20-050-04-02, ensure the mounting thread (3/4-14 NPT) matches the mating port on the machine casing. The standoff adapter length of 2 in must be selected to achieve the correct probe gap. The probe cable length of 1.0 m should be routed without sharp bends to maintain signal integrity. For hazardous area installations, connect the circuit per drawing 140979 to maintain non-incendive operation. The dome cover screws into the body; verify O-rings are seated properly to preserve the Type 4 enclosure seal.

Maintenance & Reliability

Periodically inspect the housing assembly for signs of corrosion or mechanical damage, especially in harsh environments. Check that all conduit fittings remain tight and the dome cover seal is intact. The aluminum body with 304 stainless steel sleeve offers good resistance to atmospheric corrosion. No internal disassembly is required for routine inspection. Replace O-rings if leakage is suspected.

Selecting the Right Proximity Probe Housing Assembly for Hazardous Areas

When protecting critical rotating machinery in hazardous environments, the housing assembly is as vital as the probe itself. The Bently Nevada 21000-28-10-20-050-04-02 offers a robust solution engineered for explosion-proof applications, combining a lightweight aluminum body with a 304 stainless steel sleeve for corrosion resistance and mechanical integrity.

This assembly is designed for use with a 3300 XL 8 mm probe, selectable with hazardous area approvals. The 1.0 m (39 in) probe cable provides a practical reach for typical installations, while the 2 in standoff adapter positions the probe correctly relative to the target surface. With a probe penetration of 5 in, this configuration suits many standard bearing housing geometries.

Compatibility & Integration

This housing is designed for use with Bently Nevada 3300 XL 8 mm proximity probes. The 3/4-14 NPT mounting thread is standard for many industrial machine ports. The assembly is available with Canadian Standards Association (CSA) approvals for hazardous areas. For intrinsically safe applications, order hazardous area approved probes with the 21000 aluminum housing.

Selection Guide & Purchasing Advice

When ordering the 21000-28-10-20-050-04-02, verify that the suffix codes match your application requirements: probe option 28 for 3300 XL 8 mm with hazardous area approvals, cable length 10 for 1.0 m, standoff adapter 20 for 2 in, penetration 050 for 5 in, fitting 04 for one 3/4-14 NPT plug, and mounting thread 02 for 3/4-14 NPT. The mounting thread option must be ordered if the standoff adapter length option is not 00. Contact AutoDCSTech to confirm current lifecycle status and availability before ordering.