21000-34-00-30-039-04-02 | Bently Nevada 3.9 in Probe Housing Assembly

Introduction to the 21000-34-00-30-039-04-02 Proximity Probe Housing Assembly

When machinery vibration monitoring demands robust and accurate sensor mounting, the 21000-34-00-30-039-04-02 from Bently Nevada delivers a proven solution. This proximity probe housing assembly is engineered for harsh industrial environments, providing a secure enclosure for the 3300 XL 8 mm probe with connector protector. The 21000 series is designed to meet the American Petroleum Institute's API 670 Standard for externally mounted proximity probe housings, ensuring reliable performance in critical rotating machinery applications.

With a 3.0-inch standoff adapter and a 3.9-inch probe penetration, this assembly fits specific mounting requirements. The aluminum body with a 304 stainless steel sleeve offers durability and corrosion resistance. The unit includes a 3/4-14 NPT plug fitting and is available with CSA Type 4 enclosure certification for hazardous area use when ordered with appropriate options.

Key Features and Technical Specifications

• Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals
• Standoff Adapter Length: 3.0 inches
• Probe Penetration: 3.9 inches
• Fitting: 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
• Certification: CSA Type 4 enclosure, explosion-proof for hazardous areas (with specific options)

The 21000-34-00-30-039-04-02 includes a dome cover, threaded ports for conduit connections, a probe sleeve of optional length, O-rings, a reverse mount proximity probe, a thread seal, optional conduit fittings, and an optional standoff adapter. This comprehensive assembly simplifies installation and ensures reliable sensor positioning.

Real-World Applications and Use Cases

In the oil and gas industry, the 21000-34-00-30-039-04-02 is commonly used for vibration monitoring on compressors, turbines, and pumps. Its CSA Type 4 enclosure and explosion-proof rating (with appropriate options) make it suitable for hazardous areas where flammable gases or vapors may be present. The API 670 compliance ensures that the housing meets industry standards for externally mounted proximity probes, providing consistent and accurate measurements.

For power generation facilities, this housing assembly offers reliable performance in steam turbine and generator monitoring applications. The 3.9-inch probe penetration allows for proper insertion depth, while the 3.0-inch standoff adapter provides the necessary clearance for installation in tight spaces. The aluminum and stainless steel construction withstands harsh environmental conditions, including moisture and corrosive agents.

Installation and Setup Guide

Mounting the 21000-34-00-30-039-04-02 requires a 3/4-14 NPT threaded opening on the machine casing. The standoff adapter should be selected based on the required clearance between the housing and the probe tip. Ensure that the probe cable is properly routed through the conduit ports to avoid damage during operation. The O-rings and thread seal must be correctly installed to maintain the enclosure's integrity.

For hazardous area installations, verify that the housing options match the area classification. The explosion-proof rating is only valid when the housing is ordered with the appropriate suffix codes (E:00, E:01, E:02, or E:04). Always follow the manufacturer's installation manual and local electrical codes.

Maintenance and Reliability Tips

Regular inspection of the 21000-34-00-30-039-04-02 is essential for long-term reliability. Check the O-rings and thread seal for signs of wear or damage during routine maintenance. Ensure that the conduit fittings remain tight and that the probe cable is not pinched or abraded. The aluminum and stainless steel construction provides excellent corrosion resistance, but periodic cleaning with a soft cloth is recommended to remove dirt and debris.

For safety-rated equipment, only general maintenance practices should be followed. Do not attempt to disassemble the housing or clean internal components without proper training. Refer to the Bently Nevada manual for detailed maintenance procedures.

Compatibility and Integration

The 21000-34-00-30-039-04-02 is designed for use with Bently Nevada 3300 XL 8 mm proximity probes. It integrates seamlessly with Bently Nevada monitoring systems, including the 3500 and 3300 series rack-based monitors. The housing assembly is compatible with standard conduit systems and can be used with optional explosion-proof fittings for hazardous area applications.

For systems requiring CSA Type 4 enclosure certification, this housing meets the requirements when ordered with the correct options. The API 670 compliance ensures compatibility with industry-standard mounting practices and probe configurations.

Frequently Asked Questions

Q: What is the probe penetration of the 21000-34-00-30-039-04-02?

A: The probe penetration is 3.9 inches, as indicated by the suffix code 039.

Q: Is this housing assembly explosion-proof?

A: It can be rated explosion-proof when ordered with specific options (E:00, E:01, E:02, or E:04) and is CSA Type 4 certified for hazardous areas.

Q: What is the weight of the 21000-34-00-30-039-04-02?

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

Q: What mounting thread does this assembly use?

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

Q: What is the material of the housing body?

A: The body is aluminum with a 304 stainless steel sleeve.

Product Support and Availability

The 21000-34-00-30-039-04-02 is in stock and ready to ship from Petro Auto Tech. As an industrial automation parts supplier, Petro Auto Tech offers new and original factory-packed units with a 12-month warranty. Contact Petro Auto Tech for pricing, availability, and technical support.