21000-28-00-00-066-03-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-00-00-066-03-02?

When you need a robust solution for externally mounted proximity probes in demanding industrial environments, the 21000-28-00-00-066-03-02 delivers. This Bently Nevada housing assembly combines an aluminum body with a 304 stainless steel sleeve, providing corrosion resistance and mechanical strength. It is part of the 21000 series and is designed to house a 3300 XL 8 mm probe with selectable hazardous area approvals. The assembly includes a dome cover, threaded ports for conduit connections, and a probe sleeve of optional length. It also comes with O-rings, a reverse mount proximity probe, a thread seal, and optional conduit fittings. This model is certified as a CSA Type 4 enclosure and fully compliant with the API 670 Standard for externally mounted proximity probe housings.

Key Features and Technical Specs

• Probe Option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Probe Penetration: 6.6 inches (066 suffix).
• 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 3/16 inches, 1/4 to 5/16 inches, and 5/16 to 3/8 inches.
• Mounting Thread: 3/4-14 NPT (required when standoff adapter length is not 00).
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Certifications: CSA explosion-proof for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, Class III, Enclosure Type 4, T5 @ Ta = -50°C to +40°C, T4 @ Ta = -50°C to +80°C. Also RoHS compliant.

A distinctive feature is the 6.6-inch probe penetration, which allows deep insertion into machinery for accurate vibration measurements. This is critical for early detection of bearing wear or imbalance, helping prevent unplanned downtime.

Applications and Use Cases

The 21000-28-00-00-066-03-02 is ideal for vibration monitoring on rotating equipment such as pumps, compressors, turbines, and fans in oil and gas, petrochemical, and power generation facilities. Its explosion-proof certification makes it suitable for hazardous areas where flammable gases or dusts are present. For example, in a refinery, this housing assembly can be mounted on a compressor to continuously monitor shaft vibration, providing early warning of mechanical issues. The API 670 compliance ensures it meets industry standards for externally mounted probes, giving engineers confidence in its reliability.

Installation and Setup

Mounting the 21000-28-00-00-066-03-02 requires a 3/4-14 NPT threaded opening. The included fitting kit provides a 3/4-14 NPT plug, a reducer to 1/2-14 NPT, and a cable seal grip with three grommet sizes to accommodate various cable diameters. Ensure the probe cable is routed through the conduit ports and secured with the cable grip. The probe sleeve length (6.6 inches) should be selected based on the machine's casing thickness. For intrinsically safe applications, order a hazardous area approved probe. Always follow the manufacturer's installation manual for torque specifications and wiring details.

Maintenance and Reliability

Regular inspection of the 21000-28-00-00-066-03-02 helps maintain reliable operation. Check the O-rings and seals for wear or damage, especially after exposure to extreme temperatures or corrosive chemicals. The aluminum body and stainless steel sleeve resist corrosion, but periodic cleaning with a mild detergent and soft cloth is recommended. Verify that the cable seal grip remains tight to prevent moisture ingress. For safety-rated equipment, follow the manufacturer's safety manual for inspection intervals. Proper maintenance extends the service life of the housing and ensures accurate vibration data.

Compatibility and Integration

This housing assembly is designed for use with Bently Nevada 3300 XL 8 mm proximity probes. It can be integrated with Bently Nevada monitoring systems such as the 3500 series or System 1 platform. The CSA certification for non-incendive circuits (when connected per drawing 140979) allows connection to approved barriers or isolators in hazardous areas. The API 670 compliance ensures compatibility with standard mounting configurations used in the industry. For specific system integration, consult the Bently Nevada documentation or contact Petro Auto Tech.

Common Questions About the 21000-28-00-00-066-03-02

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

A: The probe penetration is 6.6 inches, indicated by the 066 suffix in the part number.

Q: Is this housing assembly certified for hazardous areas?

A: Yes, it is CSA certified for explosion-proof applications in Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, and Class III. It also has Enclosure Type 4 rating.

Q: What mounting thread does it use?

A: The mounting thread is 3/4-14 NPT, which is required unless a standoff adapter is used.

Q: What materials are used in the construction?

A: The body is aluminum, and the sleeve is 304 stainless steel.

Q: What is the typical weight of this housing?

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

Product Support and Availability

The 21000-28-00-00-066-03-02 is in stock and ready to ship from Petro Auto Tech. We offer a 12-month factory warranty and provide new, original factory-packed units. For ordering assistance or technical questions, contact our team.