21000-28-00-20-018-04-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

What Makes the 21000-28-00-20-018-04-02 Essential for Machinery Protection?

When rotating machinery demands reliable vibration monitoring in hazardous environments, the 21000-28-00-20-018-04-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is designed for externally mounted probes, providing a secure housing that meets API 670 standards. With a 3300 XL 8 mm probe and selectable hazardous area approvals, it ensures accurate data collection even in explosive atmospheres. The assembly includes an aluminum body with a 304 stainless steel sleeve, offering durability and corrosion resistance. Engineers can trust this unit for continuous operation in demanding industrial settings.

Key Features and Technical Specifications of the 21000-28-00-20-018-04-02

• Probe Type: 3300 XL 8 mm proximity probe with selectable hazardous area approvals.
• Standoff Adapter Length: 2 inches (Option C dimension).
• Probe Penetration: 1.8 inches (Option D dimension).
• Fittings Option: One 3/4-14 NPT plug included.
• Mounting Thread: 3/4-14 NPT (required when standoff adapter is not zero).
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Certifications: CSA Type 4 enclosure, explosion proof for hazardous areas, compliant with API 670.

A standout feature is the adjustable probe penetration range of 13 mm (± 0.5 in), allowing fine-tuning for optimal clearance in tight machine casings. This flexibility reduces installation complexity and improves measurement accuracy.

Applications and Use Cases for the Bently Nevada 21000-28-00-20-018-04-02

This housing assembly is ideal for monitoring vibration in compressors, turbines, pumps, and fans. In petrochemical plants, its explosion-proof rating ensures safe operation in Class I, Division 1 areas. The API 670 compliance makes it a preferred choice for refineries and offshore platforms. Additionally, the 2-inch standoff adapter accommodates machines with limited access, while the 1.8-inch probe penetration suits standard bearing housings. For installations requiring probe penetration lengths over 12 inches, sleeve support is recommended to prevent resonance.

Installation and Setup Guidance

Mount the 21000-28-00-20-018-04-02 using the 3/4-14 NPT thread for secure attachment. Ensure the standoff adapter length matches the machine's clearance requirements. For probe penetrations between 1.0 and 2.0 inches, counter boring the machine case may reduce side view effects. Always verify the O-rings and thread seal are properly seated to maintain the explosion-proof integrity. Refer to the Bently Nevada manual for torque specifications and wiring details.

Maintenance and Reliability Tips

Regularly inspect the housing for corrosion or damage, especially in harsh environments. Check the O-rings and seals periodically to maintain the CSA Type 4 rating. The aluminum and stainless steel construction resists rust, extending service life. For long-term reliability, avoid exceeding the maximum probe penetration adjustment range. Following these steps minimizes downtime and ensures consistent vibration data.

Frequently Asked Questions About the 21000-28-00-20-018-04-02

Q: What is the standoff adapter length for this model?

A: The standoff adapter length is 2 inches (Option C dimension).

Q: What type of probe does the 21000-28-00-20-018-04-02 support?

A: It supports a 3300 XL 8 mm proximity probe with selectable hazardous area approvals.

Q: Is this housing assembly certified for hazardous areas?

A: Yes, it is CSA Type 4 certified and rated explosion proof for hazardous locations.

Q: What mounting thread is required for installation?

A: The mounting thread is 3/4-14 NPT, which must be ordered if the standoff adapter option is not zero.

Q: Can the probe penetration be adjusted?

A: Yes, the probe penetration option D has an adjustment range of 13 mm (± 0.5 in).

Product Support and Availability

The 21000-28-00-20-018-04-02 is in stock and ready to ship from Petro Auto Tech. As a trusted supplier of industrial automation parts, Petro Auto Tech offers this new, original factory-packed unit with a 12-month warranty. Contact our team for ordering assistance or technical inquiries.