21000-28-00-20-065-04-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-00-20-065-04-02?

When harsh environments threaten vibration monitoring reliability, the 21000-28-00-20-065-04-02 delivers a robust solution. This Bently Nevada Proximity Probe Housing Assembly protects a 3300 XL 8 mm probe within a CSA Type 4 enclosure. It is rated explosion proof for hazardous areas. Maintenance engineers rely on its aluminum body with a 304 stainless steel sleeve for durability. The assembly includes a dome cover, threaded conduit ports, and an optional standoff adapter. This model is fully compliant with API 670 standards for externally mounted housings.

Key Features & Technical Specs

• The 21000-28-00-20-065-04-02 uses a 3300 XL 8 mm probe with selectable hazardous area approvals.
• It includes a 2-inch standoff adapter length (Option C dimension).
• Probe penetration is 6.5 inches (Option D dimension).
• The assembly weighs 1.1 kg (2.4 lb) typical, without fittings.
• It comes with one 3/4-14 NPT plug (Fittings Option 04).
• Mounting thread is 3/4-14 NPT (Option -02).
• The housing is certified as CSA Type 4 and explosion proof for hazardous areas.
• It is fully compliant with the American Petroleum Institute's API 670 Standard.

Applications & Use Cases

This housing assembly excels in rotating machinery monitoring. It is ideal for compressors, turbines, and pumps in refineries and chemical plants. The explosion-proof rating makes it suitable for Zone 1 and Zone 2 hazardous locations. Maintenance teams benefit from its rugged design that reduces probe damage during installation. The assembly supports both intrinsically safe and non-intrinsically safe proximity probes.

Installation & Setup

Mount the 21000-28-00-20-065-04-02 using the 3/4-14 NPT thread. Ensure the standoff adapter length matches the 2-inch requirement. For probe penetration lengths between 1.0 and 2.0 inches, counter bore the machine case 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. The adjustment range of probe penetration option D is 13 mm (± 0.5 in). Always follow the manufacturer's manual for torque specifications.

Maintenance & Reliability

Regular inspection of the O-rings and thread seal ensures long-term reliability. The aluminum body resists corrosion in most industrial environments. The 304 stainless steel sleeve provides additional wear resistance. Verify the conduit fittings remain tight after installation. This design minimizes downtime by protecting the probe from mechanical damage. Routine checks every six months help maintain optimal performance.

Compatibility & Integration

The 21000-28-00-20-065-04-02 works with Bently Nevada 3300 XL 8 mm proximity probes. It is compatible with most Bently Nevada monitoring systems. The CSA Type 4 enclosure allows integration into existing hazardous area installations. The assembly supports both standard and intrinsically safe probe configurations. For system-specific wiring, refer to the official Bently Nevada documentation.

FAQ about 21000-28-00-20-065-04-02

Q: What probe does the 21000-28-00-20-065-04-02 accept?

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

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

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

Q: Is this housing assembly rated for hazardous areas?

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

Q: What is the weight of the 21000-28-00-20-065-04-02?

A: It weighs 1.1 kg (2.4 lb) typical, without fittings.

Q: What mounting thread does this assembly use?

A: It uses a 3/4-14 NPT mounting thread (Option -02).

Product Support & Availability

The 21000-28-00-20-065-04-02 is in stock and ready to ship from Petro Auto Tech. We offer new and original factory-packed units with a 12-month warranty. Contact our team for pricing and delivery options.