21000-28-05-00-085-03-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

Introduction to the 21000-28-05-00-085-03-02

When machinery protection demands precision and durability, the 21000-28-05-00-085-03-02 from Bently Nevada provides a robust solution. This Proximity Probe Housing Assembly is part of the trusted 21000 series, engineered for industrial environments where vibration monitoring is critical. With an aluminum body and 304 stainless steel sleeve, it withstands harsh conditions while maintaining accurate measurements.

Key Features and Technical Specifications

• Probe option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Cable length: 0.5 m (20 inches) for flexible installation.
• Probe penetration: 8.5 inches for deep access.
• 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 3/8 inches.
• Mounting thread: 3/4-14 NPT for secure attachment.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) dimension: 13.5 inches (34.3 mm) with 0.5 m cable.

The 21000-28-05-00-085-03-02 includes a dome cover, threaded ports, probe sleeve, O-rings, reverse mount proximity probe, thread seal, and optional conduit fittings. It is available with CSA approvals for explosion-proof hazardous areas, rated CSA Type 4 enclosure, and compliant with API 670 Standard.

Applications and Use Cases

This housing assembly is ideal for externally mounted proximity probes in rotating machinery such as turbines, compressors, and pumps. In petrochemical plants, it provides reliable vibration monitoring in Class I Division 1 and 2 environments. The CSA Type 4 rating ensures protection against water and dust ingress, making it suitable for outdoor installations. For intrinsically safe applications, you can order hazardous area approved probes with this housing.

Installation and Setup

Mount the 21000-28-05-00-085-03-02 using the 3/4-14 NPT mounting thread. Select the appropriate cable seal grip grommet for your cable size (1/8 to 3/16 inches, 1/4 to 5/16 inches, or 5/16 to 3/8 inches). Ensure the standoff adapter option is 00 if not needed. Follow the manufacturer's manual for proper probe penetration depth and torque specifications.

Maintenance and Reliability

Regularly inspect the O-rings and thread seal for wear to maintain explosion-proof integrity. Verify the cable seal grip is tight to prevent moisture ingress. The aluminum and stainless steel construction resists corrosion, extending service life in harsh environments. For long-term reliability, follow Bently Nevada's recommended inspection intervals.

Compatibility and Integration

The 21000-28-05-00-085-03-02 integrates with Bently Nevada monitoring systems. It is fully compliant with API 670 Standard for externally mounted proximity probe housings. The CSA certification ensures compatibility with North American hazardous area requirements. For non-North American end users, the standard 21000 housing is available.

Frequently Asked Questions

What is the probe cable length for the 21000-28-05-00-085-03-02?

The probe cable length is 0.5 m (20 inches).

What hazardous area approvals does this housing have?

The 21000-28-05-00-085-03-02 is CSA certified for 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 is rated Enclosure Type 4 with T5 @ Ta = -50°C to +40°C and T4 @ Ta = -50°C to +80°C.

What is the weight of the 21000-28-05-00-085-03-02?

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

What mounting thread is used for this housing?

The mounting thread option is 3/4-14 NPT.

Is this housing compliant with API 670?

Yes, the 21000-28-05-00-085-03-02 is fully compliant with the American Petroleum Institute's API 670 Standard for externally mounted proximity probe housings.