21000-28-05-00-066-04-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

Introduction to the 21000-28-05-00-066-04-02

When machine vibration threatens uptime, the 21000-28-05-00-066-04-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is part of the 21000 series, engineered for hazardous area monitoring. It features an aluminum body with a 304 stainless steel sleeve, ensuring durability in demanding industrial environments.

Key Features and Technical Specs

• Probe Type: 3300 XL 8 mm probe with connector, selectable hazardous area approvals.
• Cable Length: 0.5 m (20 in) probe cable.
• Probe Penetration: 6.6 in (option D dimension).
• Fittings: One 3/4-14 NPT plug only.
• Mounting Thread: 3/4-14 NPT (required when standoff adapter length is not -00).
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Material: Aluminum body with 304 stainless steel sleeve.

A standout spec is the 0.5 m cable length, which enables compact installations where space is limited. This reduces the risk of cable damage and simplifies routing in tight machine compartments.

Real-World Applications

In rotating machinery monitoring, the 21000-28-05-00-066-04-02 excels. It is commonly used in turbines, compressors, and pumps where proximity probes measure shaft vibration. The housing is certified as CSA Type 4 and complies with API 670 for externally mounted housings. For example, in a refinery compressor train, this assembly provides reliable data for predictive maintenance, reducing unplanned downtime.

Installation Guide

Mounting the 21000-28-05-00-066-04-02 requires careful planning. The probe penetration option D offers an adjustment range of 13 mm (±0.5 in). For penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may be needed to reduce side view effects. If the total penetration (C plus D) exceeds 300 mm (12 in), add sleeve support near the probe to prevent resonance. Always use the 3/4-14 NPT mounting thread when the standoff adapter length is not -00.

Maintenance and Reliability

Regular inspection of the O-rings and thread seal ensures long-term reliability. The aluminum body resists corrosion, while the stainless steel sleeve protects against wear. Following Bently Nevada's guidelines helps maximize service life and maintain accurate readings.

Comparison with Similar Housings

Compared to the 24701 stainless steel housing, the 21000 aluminum version is lighter (1.1 kg typical) and cost-effective for non-corrosive environments. Both share CSA Type 4 certification and API 670 compliance. However, the 21000-28-05-00-066-04-02 offers a 0.5 m cable and 6.6 in penetration, making it ideal for medium-depth installations.

Frequently Asked Questions

Q: What is the probe type used in the 21000-28-05-00-066-04-02?

A: It uses a 3300 XL 8 mm probe with connector, selectable for hazardous area approvals.

Q: What is the cable length of this assembly?

A: The probe cable length is 0.5 m (20 in).

Q: What mounting thread does it require?

A: It uses a 3/4-14 NPT mounting thread when the standoff adapter length is not -00.

Q: What is the typical weight without fittings?

A: The typical weight is 1.1 kg (2.4 lb).

Q: Is this housing suitable for hazardous areas?

A: Yes, it is rated explosion proof and available with CSA approvals for hazardous areas.

Product Support and Availability

The 21000-28-05-00-066-04-02 is in stock and ready to ship from Petro Auto Tech. As a new and original factory-packed unit, it comes with a 12-month warranty. Contact Petro Auto Tech for lifecycle status and ordering details.