21000-28-05-20-050-04-02 | Bently Nevada 8 mm Probe Housing Assembly

Solving Vibration Monitoring Challenges with the 21000-28-05-20-050-04-02

When rotating machinery in hazardous areas demands precise and continuous vibration measurement, engineers often face the challenge of finding a housing that combines durability with safety certifications. The 21000-28-05-20-050-04-02 from Bently Nevada addresses this need directly. This proximity probe housing assembly integrates a 3300 XL 8 mm probe with a 0.5 m cable, a 2-inch standoff adapter, and a 5-inch probe penetration, all within an aluminum body featuring a 304 stainless steel sleeve. It is designed for use in Class I, Division 1 and 2, Groups C and D environments, as well as Class II, Division 1 and 2, Groups E, F, and G, with a Type 4 enclosure rating. The unit weighs approximately 1.1 kg (2.4 lb) without fittings, making it a robust yet manageable component for critical asset protection.

Key Features and Technical Specifications of the 21000-28-05-20-050-04-02

• Probe Option: 28 – 3300 XL 8 mm probe with selectable hazardous area approvals.
• Probe Cable Length: 05 – 0.5 m (20 in).
• Standoff Adapter: 20 – 2 inches.
• Probe Penetration: 050 – 5 inches.
• Fitting Option: 04 – One 3/4-14 NPT plug only.
• Mounting Thread: 02 – 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 mm) with 0.5 m cable.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.

The distinctive spec here is the 8 mm probe size combined with the 0.5 m cable length, which allows for precise proximity sensing in tight installations. This configuration ensures accurate gap measurements even when space is limited, reducing the risk of false readings and unplanned downtime.

Real-World Applications for the 21000-28-05-20-050-04-02

In the oil and gas industry, compressors and pumps operating in explosive atmospheres require continuous vibration monitoring. The 21000-28-05-20-050-04-02 excels in these conditions, thanks to its CSA explosion-proof certification and Type 4 enclosure. Similarly, in power generation, turbines and generators benefit from the housing's ability to withstand harsh environments while delivering reliable data. For chemical processing plants, the 304 stainless steel sleeve offers corrosion resistance, extending service life and reducing maintenance intervals.

Installation and Setup Guidance

Mounting the 21000-28-05-20-050-04-02 requires a 3/4-14 NPT threaded port, as specified by the mounting thread option. The standoff adapter of 2 inches must be ordered unless the option is 00. During installation, ensure the probe sleeve length (5 inches) matches the required penetration into the machine casing. Use the provided O-rings and thread seal to maintain the explosion-proof integrity. Always follow the manufacturer's manual for torque specifications and wiring connections to preserve the CSA certification.

Maintenance and Reliability Best Practices

Regular inspection of the 21000-28-05-20-050-04-02 should focus on the O-rings and thread seal for signs of wear or degradation. The aluminum body and stainless steel sleeve resist corrosion, but periodic checks in aggressive chemical environments are recommended. Verify that the probe cable (0.5 m) is not kinked or damaged, as this can affect signal quality. By adhering to a routine maintenance schedule, users can maximize the housing's service life and maintain compliance with API 670 standards.

Compatibility and Integration

The 21000-28-05-20-050-04-02 is fully compliant with the American Petroleum Institute's API 670 Standard for externally mounted proximity probe housings. It integrates seamlessly with Bently Nevada monitoring systems and other vibration analysis equipment. The housing accepts 3300 XL 8 mm probes with hazardous area approvals, ensuring compatibility across a wide range of industrial applications. For non-incendive circuits, refer to drawing 140979 for proper connection.

Frequently Asked Questions about the 21000-28-05-20-050-04-02

What is the maximum ambient temperature for the 21000-28-05-20-050-04-02?

The housing is rated T5 at Ta = -50°C to +40°C and T4 at Ta = -50°C to +80°C, as per CSA certification.

Can the 21000-28-05-20-050-04-02 be used in intrinsically safe applications?

Yes, hazardous area approved proximity probes can be ordered with this housing for intrinsically safe applications.

What is the weight of the 21000-28-05-20-050-04-02 without fittings?

The typical weight is 1.1 kg (2.4 lb) without fittings.

Is the 21000-28-05-20-050-04-02 RoHS compliant?

Yes, it complies with the RoHS Directive 2011/65/EU.

Product Support and Availability

The 21000-28-05-20-050-04-02 is available as new and original in factory packing from Petro Auto Tech. It comes with a 12-month factory warranty. For current lifecycle status and ordering information, please contact Petro Auto Tech directly.