21000-34-00-15-039-03-02 | Bently Nevada 3.9 in Probe Housing Assembly

What Is the 21000-34-00-15-039-03-02?

When machinery vibration monitoring demands a robust and certified enclosure, the 21000-34-00-15-039-03-02 from Bently Nevada provides a proven solution. This proximity probe housing assembly is part of the 21000 series, designed to protect the probe in harsh industrial environments. It features an aluminum body with a 304 stainless steel sleeve for durability and corrosion resistance. The assembly includes a dome cover, threaded conduit ports, a probe sleeve, O-rings, a reverse mount probe, and a thread seal. It is available with Canadian Standards Association (CSA) approvals and is rated explosion proof for hazardous areas. The housing is certified as a CSA Type 4 enclosure and fully complies with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings.

Key Features & Technical Specs

• Probe Penetration: 3.9 in (039 suffix).
• Standoff Adapter: 1.5 in (15 suffix).
• Mounting Thread: 3/4-14 NPT (suffix -02).
• Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals (34 suffix).
• Probe Cable Length: 1.0 m (probe cable not required per suffix 00).
• Maximum (C) + (D) Dimension: 32.9 in (83.5 cm).
• Maximum (C) + (D) with visible probe P/N and S/N: 17.0 in (43.18 cm).
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Material: Aluminum body with 304 stainless steel sleeve.

A distinctive feature is the 3.9 in probe penetration, which allows the sensor to reach the target area through thick machine casings or insulation, ensuring accurate vibration readings even in confined spaces.

Real-World Applications

In rotating machinery such as compressors, turbines, and pumps, the 21000-34-00-15-039-03-02 housing assembly provides a secure mounting point for the proximity probe. Its CSA Type 4 enclosure and explosion-proof rating make it suitable for hazardous areas where flammable gases or dust may be present. The assembly's compliance with API 670 ensures it meets industry standards for externally mounted probes, giving engineers confidence in critical asset protection.

Installation Guide

Begin by selecting the appropriate mounting location on the machine casing. The 3/4-14 NPT mounting thread (suffix -02) allows direct installation into standard threaded ports. Use the included fittings: one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and one cable seal grip with grommets for cable sizes from 1/8 to 3/8 inches. Ensure the probe sleeve length matches the required standoff distance. Tighten all connections to prevent leaks and maintain the enclosure's integrity. Always follow the manufacturer's manual for torque specifications and wiring details.

Routine Care & Reliability

Regular inspection of the housing assembly helps maintain reliable operation. Check the O-rings and thread seal for wear or damage, especially after exposure to temperature extremes or corrosive atmospheres. Verify that the dome cover is securely fastened and that the conduit connections remain tight. The aluminum and stainless steel construction resists corrosion, but periodic cleaning with a damp cloth and mild detergent is recommended. Avoid using abrasive tools or solvents that could damage the enclosure. Following these simple steps extends the service life of the 21000-34-00-15-039-03-02 and reduces unplanned downtime.

Compatibility & Integration

This housing assembly is designed for use with Bently Nevada 3300 XL 8 mm proximity probes and compatible monitoring systems. The 1.0 m probe cable length (when ordered) connects to the probe, while the housing provides the mechanical interface to the machine. The assembly integrates seamlessly into existing Bently Nevada vibration monitoring architectures, supporting both new installations and retrofits. For system-specific wiring and configuration, refer to the official Bently Nevada documentation.

Common Questions

Q: What is the probe penetration of the 21000-34-00-15-039-03-02?

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

Q: Is this housing assembly suitable for hazardous areas?

A: Yes, it is rated explosion proof for hazardous areas and has CSA Type 4 enclosure certification.

Q: What mounting thread does this model use?

A: It uses a 3/4-14 NPT mounting thread (suffix -02).

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

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

Q: Does the housing comply with API 670?

A: Yes, it is fully compliant with the API 670 Standard for externally mounted proximity probe housings.

Product Support & Availability

The 21000-34-00-15-039-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing, lead times, and technical support. We provide factory-sealed, new and original parts with a 12-month warranty.