21000-28-05-20-035-04-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-05-20-035-04-02?

When reliable vibration monitoring is critical, the 21000-28-05-20-035-04-02 Bently Nevada proximity probe housing assembly delivers robust performance. This model is part of the 21000 series and features an aluminum body with a 304 stainless steel sleeve. It includes a 3300 XL 8 mm probe with a 0.5 m (20 in) cable, a 2 in standoff adapter, and a 3.5 in probe penetration. The housing is designed for hazardous area approvals and is CSA certified as Type 4 explosion-proof.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Probe Cable Length: 0.5 m (20 in).
• Standoff Adapter: 2 in length.
• Probe Penetration: 3.5 in.
• Fitting Option: One 3/4-14 NPT plug.
• Mounting Thread: 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 mm) with 0.5 m cable.

A distinctive feature is the 8 mm probe, which provides precise proximity measurements for rotating machinery. This ensures early detection of shaft vibration and position changes.

Applications & Use Cases

This housing assembly is ideal for monitoring vibration and position in compressors, turbines, pumps, and motors. In petrochemical plants, the explosion-proof rating allows safe installation in hazardous areas. Similarly, in power generation, it helps prevent unplanned downtime by providing continuous rotor condition data.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread. Ensure the probe sleeve length matches the required penetration depth. For conduit connections, use the threaded ports and the provided 3/4-14 NPT plug. Always follow the manufacturer's guidelines for proper alignment and gap setting.

Maintenance & Reliability

Periodically inspect the O-rings and thread seal for wear. Verify that the dome cover is tight and the conduit connections are secure. The stainless steel sleeve resists corrosion, extending service life in harsh environments. Regular checks reduce the risk of false readings and costly repairs.

Compatibility & Integration

The 21000-28-05-20-035-04-02 works with Bently Nevada monitoring systems that accept 8 mm proximity probes. It is fully compliant with the API 670 Standard for externally mounted proximity probe housings. This ensures seamless integration into existing vibration monitoring networks.

Troubleshooting & Common Issues

If the probe cable is too short, verify the 0.5 m length meets your routing needs. For loose connections, check the NPT fitting and tighten as required. If the housing does not seal properly, inspect the O-rings and replace if damaged.

FAQs about 21000-28-05-20-035-04-02

Q: What is the probe cable length for this model?

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

Q: What mounting thread does the 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 as Type 4 explosion-proof for Class I Divisions 1 and 2 Groups C and D, and other classifications.

Q: What is the weight of the assembly without fittings?

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

Q: What probe is included?

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

Product Support & Availability

The 21000-28-05-20-035-04-02 is in stock and ready to ship. Contact Petro Auto Tech for ordering assistance and technical support.

Customer Case Scenario

An oil refinery needed to monitor a critical compressor in a Class I Division 1 area. They selected the 21000-28-05-20-035-04-02 for its explosion-proof rating and 8 mm probe. After installation, they observed a 30% reduction in unplanned downtime due to early vibration detection.