21000-34-00-20-050-04-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the 21000-34-00-20-050-04-02

When machinery vibration threatens uptime, the 21000-34-00-20-050-04-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is engineered for hazardous area applications, featuring an aluminum body with a 304 stainless steel sleeve. It includes a 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals, and a 1.0 m probe cable. The assembly weighs 1.1 kg (2.4 lb) typical without fittings and is certified as a CSA Type 4 enclosure, fully compliant with API 670 standard for externally mounted proximity probe housings.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals
• Standoff Adapter: 2 inches (20 suffix)
• Probe Penetration: 5 inches (050 suffix)
• Fitting Option: One 3/4-14 NPT plug only
• Mounting Thread: 3/4-14 NPT (mandatory when standoff adapter is not -00)
• Material: Aluminum body with 304 stainless steel sleeve
• Maximum (C) + (D) Dimension: 32.9 in (83.5 cm)
• Weight: 1.1 kg (2.4 lb) typical, without fittings
• Certifications: CSA explosion proof for hazardous areas; CSA Type 4 enclosure; API 670 compliant

A distinctive feature is the 5-inch probe penetration combined with the 2-inch standoff adapter, enabling precise gap setting in tight installations. This reduces setup time and improves measurement repeatability.

Applications & Use Cases

In the oil and gas industry, the 21000-34-00-20-050-04-02 excels at monitoring compressor and turbine shaft vibration in explosive environments. Its CSA explosion-proof rating ensures safe operation in Class I, Division 1 areas. For petrochemical plants, this housing assembly integrates seamlessly with existing Bently Nevada monitoring systems. The 8 mm probe provides reliable displacement measurements, helping operators detect early bearing wear and imbalance. By preventing unplanned downtime, this assembly delivers significant cost savings over its service life.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread on the standoff adapter. Ensure the probe cable length of 1.0 m is sufficient for your junction box location. The dome cover screws into the body, providing access to the reverse mount proximity probe. Use the provided O-rings and thread seal to maintain the explosion-proof integrity. For hazardous area installations, follow all local electrical codes and the Bently Nevada manual.

Maintenance & Reliability

Inspect the housing assembly periodically for physical damage and corrosion, especially in harsh environments. The aluminum body with 304 stainless steel sleeve offers excellent resistance to chemical exposure. Verify that all O-rings and seals remain intact to preserve the CSA Type 4 rating. Regular inspection per manufacturer guidelines ensures long-term reliability and minimizes the risk of false readings.

Compatibility & Integration

The 21000-34-00-20-050-04-02 is designed for use with Bently Nevada monitoring systems that accept 8 mm proximity probes. It is fully compliant with API 670, making it suitable for integration into most industrial vibration monitoring architectures. The selectable hazardous area approvals allow use in intrinsically safe applications when paired with appropriate barriers.

Troubleshooting & Common Issues

If the probe fails to provide a stable signal, first check the cable connection at the probe and the monitor. Verify that the standoff adapter is correctly torqued to avoid mechanical looseness. In explosive environments, never open the housing while power is applied. For persistent issues, consult the Bently Nevada documentation or contact Petro Auto Tech for support.

FAQ about 21000-34-00-20-050-04-02

What is the probe penetration of the 21000-34-00-20-050-04-02?

The probe penetration is 5 inches (suffix 050).

What mounting thread does this assembly use?

It uses a 3/4-14 NPT thread (suffix -02), which is mandatory when the standoff adapter is not -00.

Is the 21000-34-00-20-050-04-02 suitable for hazardous areas?

Yes, it is CSA certified explosion proof for hazardous areas and can be ordered with selectable hazardous area approvals.

What is the weight of this housing assembly?

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

What probe is included with this assembly?

It includes a 3300 XL 8 mm probe with connector protector.

Product Support & Availability

The 21000-34-00-20-050-04-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. We provide factory warranty and original packaging.