21000-34-00-00-039-03-02 | Bently Nevada 3.9 in Probe Housing Assembly

Introduction to the Bently Nevada 21000-34-00-00-039-03-02

When you need reliable vibration monitoring in hazardous environments, the 21000-34-00-00-039-03-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is part of the 21000 series, engineered for externally mounted probes. It combines an aluminum body with a 304 stainless steel sleeve for durability. The assembly includes a dome cover, threaded ports, and a probe sleeve. It also comes with O-rings and a reverse mount proximity probe. This unit is ideal for applications requiring explosion-proof ratings.

Key Features and Technical Specs of the 21000-34-00-00-039-03-02

• Probe Penetration: 3.9 in (039 suffix code) for precise measurement depth.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Fitting Option: Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip for cable sizes 1/8 to 3/8 inches.
• Mounting Thread: 3/4-14 NPT (-02 option) for secure installation.
• Weight: 1.1 kg (2.4 lb) typical, without fittings, for easy handling.
• Maximum Probe Cable Length: 1.0 m, with visible probe dimensions up to 17.0 in (43.18 cm) for (C) + (D).
• Maximum (C) + (D) Dimension: 32.9 in (83.5 cm) to accommodate various setups.
• Approvals: CSA explosion-proof rating for hazardous areas; CSA Type 4 enclosure; API 670 compliant.

A distinctive spec is the 3.9 in probe penetration, which ensures accurate gap measurements in tight installations. This feature directly impacts machine protection by providing consistent proximity sensing.

Applications and Use Cases for the 21000-34-00-00-039-03-02

This housing assembly is designed for rotating machinery monitoring in refineries, chemical plants, and gas processing facilities. For example, it mounts externally on compressors and turbines to measure shaft vibration and position. Its CSA explosion-proof rating makes it suitable for Class I, Division 1 hazardous areas. Additionally, the API 670 compliance ensures it meets industry standards for externally mounted proximity probes. Engineers often choose this model for retrofit projects where existing housings fail to meet safety codes.

Installation and Setup Guide

Start by selecting the correct mounting thread—3/4-14 NPT—as specified by the -02 suffix. Use the included fittings: the 3/4-14 NPT plug and reducer for conduit connections. Ensure the cable seal grip accommodates your cable diameter (1/8 to 3/8 inches). Tighten the dome cover securely to maintain the explosion-proof seal. Verify the probe penetration of 3.9 in aligns with the target gap. Always follow Bently Nevada’s manual for torque values and wiring. For hazardous areas, confirm the assembly is properly grounded per local codes.

Maintenance and Reliability Tips

Inspect the O-rings and dome cover seal periodically for wear. Check the cable seal grip for tightness to prevent moisture ingress. The aluminum and stainless steel construction resists corrosion in harsh environments. For cost savings, regular inspection reduces unplanned downtime. Replace the probe if the cable shows damage. Store the assembly in a clean, dry area when not in use. Refer to the manufacturer’s manual for detailed maintenance intervals.

Compatibility and Integration

The 21000-34-00-00-039-03-02 works with Bently Nevada proximity probes and monitoring systems. It accepts a 3300 XL 8 mm probe with connector protector (suffix 34). The housing integrates with standard conduit systems using 3/4-14 NPT fittings. It is compatible with intrinsically safe applications when paired with approved probes. For system integration, consult the API 670 standard for mounting requirements. This assembly is a drop-in replacement for existing 21000 series housings.

Frequently Asked Questions about the 21000-34-00-00-039-03-02

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

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

Q: Is the 21000-34-00-00-039-03-02 certified for hazardous areas?

A: Yes, it has CSA explosion-proof approval and is rated as a CSA Type 4 enclosure.

Q: What mounting thread does this assembly use?

A: It uses a 3/4-14 NPT thread, specified by the -02 mounting thread option.

Q: What materials are used in the housing?

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

Q: What fittings are included with the assembly?

A: It includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip for cables from 1/8 to 3/8 inches.

Product Support and Availability

The Bently Nevada 21000-34-00-00-039-03-02 is available as a new, original factory-packed unit from Petro Auto Tech. It comes with a 12-month warranty. For lifecycle status and stock availability, please contact Petro Auto Tech directly. In-stock items ship promptly to minimize your project delays.