21000-28-05-20-050-03-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-05-20-050-03-02?

When hazardous area monitoring demands robust vibration sensing, the 21000-28-05-20-050-03-02 from Bently Nevada provides a reliable solution. This proximity probe housing assembly is part of the 21000 series, engineered for external mounting per API 670 standards. It includes a 3300 XL 8 mm probe with a 0.5 m (20 in) cable, a 2 in standoff adapter, and a 5 in probe penetration. The housing features an aluminum body with a 304 stainless steel sleeve, ensuring durability in harsh environments.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Cable Length: 0.5 m (20 in) for flexible installation.
• Standoff Adapter: 2 in length for precise positioning.
• Probe Penetration: 5 in for deep mounting applications.
• Mounting Thread: 3/4-14 NPT for secure attachment.
• Fittings Included: 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 3/8 inches.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.

A distinctive spec is the 8 mm probe size, which enables precise proximity measurements in tight spaces, reducing installation complexity.

Real-World Applications

In oil and gas facilities, the 21000-28-05-20-050-03-02 monitors rotating machinery like pumps and compressors. Its CSA Type 4 enclosure and explosion-proof rating make it ideal for Class I Division 1 and 2 hazardous areas. Additionally, it supports API 670 compliance for externally mounted probes, ensuring reliable vibration data collection.

Installation Guide

Mount the housing using the 3/4-14 NPT thread. Connect the probe cable through the cable seal grip, selecting the appropriate grommet for your cable diameter (1/8 to 3/8 inches). Use the included reducer for 1/2-14 NPT conduit. Ensure the standoff adapter is properly torqued to maintain probe gap. Always follow Bently Nevada's installation manual for hazardous area wiring.

Routine Care

Inspect the housing and probe cable periodically for wear or damage. Verify the O-rings and thread seal remain intact to maintain the explosion-proof rating. Clean the exterior with a dry cloth; avoid solvents that could damage the aluminum body. Regular inspection per manufacturer's safety manual ensures long-term reliability.

Compatible Systems

This assembly works with Bently Nevada 3300 XL 8 mm proximity probes and compatible monitoring systems. It integrates with standard 3/4-14 NPT conduit fittings. For intrinsically safe applications, pair with hazardous area approved probes and barriers as per drawing 140979.

Common Questions

Q: What is the probe cable length for the 21000-28-05-20-050-03-02?

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

Q: What mounting thread does this housing use?

A: It uses a 3/4-14 NPT mounting thread.

Q: Is this housing certified for hazardous areas?

A: Yes, it is CSA certified for explosion-proof applications in Class I Division 1 and 2 Groups C and D, among others.

Q: What is the weight of the assembly?

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

Product Support & Availability

The Bently Nevada 21000-28-05-20-050-03-02 is available in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead time.