21000-28-05-00-40-03-02 | Bently Nevada 0.5m Cable Proximity Probe Housing Assembly

Solving Vibration Monitoring Challenges with the 21000-28-05-00-40-03-02

When critical rotating machinery demands reliable vibration monitoring in hazardous environments, engineers face strict safety and performance requirements. The 21000-28-05-00-40-03-02 from Bently Nevada delivers a robust solution. This Proximity Probe Housing Assembly houses an 8 mm probe with a 0.5 m cable, designed for Class I Division 1 and 2 areas. Its aluminum body with a 304 stainless steel sleeve ensures durability while meeting CSA Type 4 enclosure standards. For applications requiring explosion-proof protection and API 670 compliance, this assembly provides a dependable foundation for accurate proximity measurements.

Key Features & Technical Specs of the 21000-28-05-00-40-03-02

• Probe Option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Cable Length: 0.5 m (20 in) probe cable for flexible installation.
• Probe Penetration: 4.0 in (40 suffix) for deep mounting requirements.
• Fitting Option: Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable sizes 1/8 to 3/8 inches.
• Mounting Thread: 3/4-14 NPT (02 suffix) for secure installation.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 mm) with visible probe.

A standout spec is the 0.5 m probe cable, which allows close coupling to the machine while maintaining signal integrity in tight spaces. This reduces installation complexity and potential noise pickup.

Real-World Applications for the 21000-28-05-00-40-03-02

In petrochemical plants, refineries, and gas processing facilities, rotating equipment such as compressors, turbines, and pumps require continuous vibration monitoring. The 21000-28-05-00-40-03-02 excels in these environments due to its CSA explosion-proof certification for Class I Divisions 1 and 2 Groups C and D, as well as Class II Divisions 1 and 2 Groups E, F, and G. Additionally, its compliance with API 670 Standard ensures it meets industry benchmarks for externally mounted proximity probe housings. This assembly is also suitable for intrinsically safe applications when paired with hazardous area approved probes.

Installation & Setup Guidance

Mount the 21000-28-05-00-40-03-02 using the 3/4-14 NPT thread for a secure fit. The included fitting kit provides a 3/4-14 NPT plug, a reducer to 1/2-14 NPT, and a cable seal grip with grommets for cable diameters from 1/8 to 3/8 inches. Ensure the probe sleeve length matches the required penetration depth of 4.0 inches. For hazardous area installations, follow all local codes and the wiring diagram provided by Bently Nevada (drawing 140979 for non-incendive circuits). Verify the enclosure seal before operation.

Maintenance & Reliability Tips

Regular inspection of the O-rings and thread seal helps maintain the explosion-proof integrity of the 21000-28-05-00-40-03-02. Check the cable seal grip grommets for wear or compression loss, especially after temperature cycling. The aluminum body and stainless steel sleeve resist corrosion in harsh environments, but periodic visual checks for physical damage are recommended. Following the manufacturer's maintenance schedule ensures long-term reliability and minimizes unplanned downtime.

Compatibility & Integration

The 21000-28-05-00-40-03-02 integrates seamlessly with Bently Nevada monitoring systems that accept 8 mm proximity probes. It is designed for use with 3300 XL probe systems and compatible rack-based monitors. The assembly is CSA certified as a Type 4 enclosure, making it suitable for outdoor and washdown environments. For North American hazardous locations, the CA21000 variant is available; verify the correct ordering code for your region.

Frequently Asked Questions about the 21000-28-05-00-40-03-02

Q: What is the probe cable length of the 21000-28-05-00-40-03-02?

A: The probe cable length is 0.5 m (20 inches), as indicated by the 05 suffix code.

Q: What hazardous area approvals does this housing carry?

A: It is CSA certified for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, and Class III. Enclosure Type 4, with temperature ratings T5 @ -50°C to +40°C and T4 @ -50°C to +80°C.

Q: What is the mounting thread size for the 21000-28-05-00-40-03-02?

A: The mounting thread is 3/4-14 NPT, as specified by the 02 suffix code.

Q: What materials are used in the housing construction?

A: The housing features an aluminum body with a 304 stainless steel sleeve for strength and corrosion resistance.

Q: What is the probe penetration depth for this model?

A: The probe penetration is 4.0 inches, indicated by the 40 suffix in the part number.

Product Support & Availability

The 21000-28-05-00-40-03-02 is available in new, original factory packaging from Petro Auto Tech. In stock and ready to ship, this assembly comes with a 12-month factory warranty. Contact Petro Auto Tech for current lifecycle status and ordering assistance.