21000-34-05-20-050-04-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction: Solving Vibration Monitoring Challenges with the 21000-34-05-20-050-04-02

When rotating machinery operates in hazardous areas, engineers face the challenge of mounting proximity probes securely while maintaining safety certifications. The 21000-34-05-20-050-04-02 from Bently Nevada addresses this need with a robust aluminum housing and 304 stainless steel sleeve. This assembly includes a 3300 XL 8 mm probe with connector protector, making it suitable for selectable hazardous area approvals. Its design ensures reliable vibration monitoring even in demanding industrial environments.

Key Features and Technical Specifications of the 21000-34-05-20-050-04-02

• Probe Option: 3300 XL 8 mm probe with connector protector for hazardous area approvals.
• Probe Cable Length: 0.5 m (20 in) for flexible installation.
• Standoff Adapter: 2.0 in to position the probe accurately.
• Probe Penetration: 5.0 in for deep mounting.
• Fitting Option: One 3/4-14 NPT plug for conduit connections.
• Mounting Thread: 3/4-14 NPT for secure attachment.
• Material: Aluminum body with 304 stainless steel sleeve for durability.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 cm) to accommodate probe and cable.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.

A standout feature is the 0.5 m probe cable, which provides a compact solution for tight spaces while maintaining signal integrity. This length is ideal for applications where the sensor must be close to the machinery but the housing remains fixed.

Applications and Use Cases for the 21000-34-05-20-050-04-02

This housing assembly is designed for externally mounted proximity probes in rotating machinery such as turbines, compressors, and pumps. It is fully compliant with the American Petroleum Institute's (API) 670 Standard, ensuring reliable performance in oil and gas applications. Additionally, the assembly is rated explosion-proof by CSA when ordered with appropriate options, making it suitable for hazardous areas. In petrochemical plants, the 21000-34-05-20-050-04-02 provides continuous vibration monitoring to prevent unplanned downtime.

Installation and Setup Guide

Mount the housing using the 3/4-14 NPT thread for a secure fit. Ensure the standoff adapter is set to 2.0 in to achieve proper probe gap. The 0.5 m cable connects to the probe via the connector protector. For explosion-proof installations, use the provided 3/4-14 NPT plug and follow CSA guidelines. Always verify the probe penetration of 5.0 in aligns with the machinery's clearance requirements.

Maintenance and Reliability Tips

Regularly inspect the O-rings and thread seal for wear to maintain enclosure integrity. Check the probe cable for damage, especially at the connector. The aluminum body and stainless steel sleeve resist corrosion in harsh environments. Periodic verification of the mounting torque ensures consistent readings. Following these steps extends the service life of the 21000-34-05-20-050-04-02 and reduces replacement costs.

Compatibility and Integration

This assembly works with Bently Nevada 3300 XL series proximity probes and compatible monitoring systems. It integrates with existing vibration monitoring networks that accept 8 mm probes. The CSA Type 4 enclosure rating allows use in outdoor and washdown areas. For intrinsically safe applications, pair with hazardous area approved probes.

Troubleshooting and Common Issues

If the probe signal is unstable, check the cable connection at the 0.5 m length for breaks. Verify the standoff adapter is set to 2.0 in to avoid incorrect gap. Ensure the mounting thread is tightened to prevent vibration loosening. If the housing is not explosion-proof, confirm the fitting option includes the correct plug.

Frequently Asked Questions about the 21000-34-05-20-050-04-02

Q: What is the probe cable length for the 21000-34-05-20-050-04-02?

A: The probe cable length is 0.5 m (20 in), as specified in the ordering information.

Q: Is the housing explosion-proof?

A: The housing is rated explosion-proof by CSA when ordered with hazardous area approval options, such as E:00, E:01, E:02, or E:04.

Q: What material is the housing made of?

A: The body is aluminum with a 304 stainless steel sleeve for durability and corrosion resistance.

Q: What is the mounting thread size?

A: The mounting thread is 3/4-14 NPT, which must be ordered if the standoff adapter length option is not -00.

Q: What is the weight of the assembly?

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

Product Support and Availability

The 21000-34-05-20-050-04-02 is available from Petro Auto Tech as a new and original factory-packed unit. It comes with a 12-month factory warranty. For lifecycle status and ordering, contact Petro Auto Tech for current availability and lead times.