21000-28-00-00-039-03-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-00-00-039-03-02?

When industrial environments demand reliable vibration monitoring in hazardous areas, the 21000-28-00-00-039-03-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is part of the 21000 series, designed for externally mounted probes. It includes an aluminum body with a 304 stainless steel sleeve, ensuring durability in harsh conditions. With a typical weight of 1.1 kg (2.4 lb) without fittings, this unit is engineered for easy installation and long-term performance.

Key Features and Technical Specs

• Probe Option: 28 3300 XL 8 mm probe with selectable hazardous area approvals.
• Probe Penetration: 039 = 3.9 inches, providing precise measurement depth.
• Mounting Thread: 3/4-14 NPT, ensuring secure attachment.
• 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 multiple cable sizes.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Certification: CSA Type 4 enclosure, explosion-proof for hazardous areas.
• Compliance: RoHS Directive 2011/65/EU.

A distinctive spec is the 3.9-inch probe penetration, which allows accurate proximity measurements in tight installations, reducing the need for custom adapters and lowering overall system cost.

Industry Applications and Use Cases

In oil and gas refineries, the 21000-28-00-00-039-03-02 monitors shaft vibration in compressors and pumps, helping prevent unplanned downtime. Similarly, in chemical processing plants, its explosion-proof rating ensures safe operation in Class I Division 1 groups C and D environments. Consequently, this housing assembly supports predictive maintenance strategies that extend equipment life and reduce repair expenses.

Installation and Setup

Mount the housing using the 3/4-14 NPT thread option. Secure the cable seal grip with the appropriate grommet for your cable diameter—choose from 1/8 to 3/16 inches, 1/4 to 5/16 inches, or 5/16 to 3/8 inches. Ensure the standoff adapter is ordered if needed; otherwise, select option 00. Always follow the manufacturer's manual for proper torque and alignment.

Maintenance and Reliability

Regularly inspect the O-rings and thread seal for wear to maintain the explosion-proof integrity. Because the housing is CSA Type 4 rated, it withstands water and dust ingress, reducing maintenance frequency. This reliability translates to lower total cost of ownership over the product's lifecycle.

Compatibility and Integration

The 21000-28-00-00-039-03-02 works with Bently Nevada 3300 XL 8 mm proximity probes and is fully compliant with API 670 Standard for externally mounted housings. It integrates seamlessly into existing vibration monitoring systems without requiring additional adapters.

FAQs about 21000-28-00-00-039-03-02

Q: What is the probe penetration length for this housing?

A: The probe penetration is 3.9 inches (039 suffix code).

Q: Is this housing certified for hazardous areas?

A: Yes, it is CSA certified explosion-proof for Class I Divisions 1 and 2 Groups C and D, and Class II Divisions 1 and 2 Groups E, F, and G.

Q: What mounting thread does it use?

A: The mounting thread option is 3/4-14 NPT, required unless the standoff adapter length is 00.

Q: What cable sizes does the seal grip accommodate?

A: The cable seal grip includes grommets for 1/8 to 3/16 inches, 1/4 to 5/16 inches, and 5/16 to 3/8 inches.

Q: What materials are used in the housing construction?

A: The body is aluminum with a 304 stainless steel sleeve.

Product Support and Availability

The 21000-28-00-00-039-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for ordering assistance or technical inquiries.