Bently Nevada 21000-28-05-20-039-04-02 Proximity Probe Housing Assembly

Technical Specifications Breakdown

Key parameters for the 21000-28-05-20-039-04-02 are listed below for quick reference:

Industry Applications for the 21000 Housing Assembly

This housing assembly is engineered for externally mounted proximity probes on rotating equipment. Typical applications include:

• Centrifugal Compressors in Refineries: The 21000-28-05-20-039-04-02 provides a sealed, explosion-proof enclosure for the 3300 XL 8 mm probe, ensuring accurate shaft vibration readings in Class I Division 1 areas.
• Steam Turbines in Power Generation: The 0.5 m probe cable and 2-inch standoff adapter allow flexible positioning while maintaining API 670 compliance.
• Pumps in Chemical Processing: The aluminum body with 304 stainless steel sleeve resists corrosion, and the CSA Type 4 enclosure rating protects against hose-directed water.

Installation & Setup Guidance

When mounting the 21000 housing, ensure the 3/4-14 NPT mounting thread is properly sealed with approved thread sealant. The standoff adapter must be ordered if the probe penetration requires a specific offset. Verify that the probe cable length of 0.5 m is sufficient for the routing path to the junction box. The fitting option includes one 3/4-14 NPT plug; additional conduit fittings may be needed for full installation.

Maintenance & Reliability

Inspect the housing assembly periodically for signs of corrosion or damage to the O-rings and dome cover. The 21000-28-05-20-039-04-02 is rated for ambient temperatures from -50°C to +80°C (T4 rating), making it suitable for extreme environments. Always verify that the probe (P/N and S/N) is visible within the maximum (C) + (D) dimension of 13.5 inches.

The Challenge of Reliable Vibration Monitoring in Hazardous Environments

Industrial rotating machinery, such as compressors and turbines in oil refineries and chemical plants, demands continuous vibration monitoring to prevent catastrophic failures. Standard proximity probe housings often fail in explosive atmospheres, leading to costly downtime and safety risks. The Bently Nevada 21000-28-05-20-039-04-02 proximity probe housing assembly provides a certified solution for these harsh conditions.

Compatibility & Integration

This housing is designed for use with Bently Nevada 3300 XL 8 mm proximity probes with selectable hazardous area approvals. It is fully compliant with API 670 and CSA Type 4 enclosures. The assembly supports non-incendive circuits when connected per drawing 140979.

Selection Guide & Purchasing Advice

Choose the 21000-28-05-20-039-04-02 for applications requiring a compact, explosion-proof housing with a 2-inch standoff and 3.9-inch probe penetration. For North American end users, the CA21000 variant is available. Contact AutoDCSTech for lifecycle status and availability before ordering. All units come new and in original factory packing with a 12-month warranty.