21000-28-00-00-039-04-02 | Bently Nevada 3.9 in Probe Housing Assembly

Introduction to the 21000-28-00-00-039-04-02

When machinery reliability is critical, the 21000-28-00-00-039-04-02 from Bently Nevada delivers a robust solution for vibration and position monitoring. This proximity probe housing assembly protects sensitive probes in demanding environments. It is part of the trusted 21000 series, known for durability and precision. Maintenance engineers appreciate its straightforward design and long service life.

Key Features and Technical Specs

• The 21000-28-00-00-039-04-02 features an aluminum body with a 304 stainless steel sleeve for corrosion resistance.
• It supports a probe penetration of 3.9 inches (039 suffix), ensuring accurate placement.
• The mounting thread option is 3/4-14 NPT (02 suffix), simplifying installation.
• It includes a one 3/4-14 NPT plug only (04 fitting option) for conduit connections.
• Typical weight is 1.1 kg (2.4 lb) without fittings, making it easy to handle.
• The housing is CSA certified as Type 4 enclosure, rated explosion-proof for hazardous areas.
• It complies with RoHS Directive 2011/65/EU, supporting environmental standards.
• The assembly is designed for use with 3300 XL 8 mm probes (28 suffix), selectable for hazardous area approvals.

One distinctive spec is the 3.9-inch probe penetration. This allows precise positioning of the probe tip relative to the shaft, reducing measurement errors and improving machine protection.

Applications and Use Cases

This housing assembly is ideal for monitoring rotating machinery such as turbines, compressors, and pumps. It meets the API 670 standard for externally mounted proximity probes. Therefore, it fits seamlessly into refinery and petrochemical applications. Maintenance teams rely on it for consistent, accurate readings in harsh conditions.

Installation and Setup

Installing the 21000-28-00-00-039-04-02 is straightforward. First, select the correct mounting thread (3/4-14 NPT) and apply thread sealant. Then, insert the probe through the sleeve and secure the dome cover. Ensure the probe cable is routed through the conduit port. Finally, verify the probe gap per manufacturer guidelines. Always follow the provided drawing 140979 for non-incendive connections.

Maintenance and Reliability

Regular inspection of the housing and O-rings ensures long-term reliability. Check for signs of corrosion or damage, especially in wet or corrosive environments. The stainless steel sleeve resists wear, extending service intervals. By choosing this assembly, you reduce unplanned downtime and lower total cost of ownership.

Compatibility and Integration

This housing works with Bently Nevada 3300 XL 8 mm proximity probes. It is compatible with standard monitoring systems that accept these probes. The CSA Type 4 rating allows use in Class I, Division 1 and 2 hazardous locations. For intrinsically safe applications, order the appropriate probe with hazardous area approvals.

Frequently Asked Questions

What is the probe penetration of the 21000-28-00-00-039-04-02?

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

What mounting thread does this housing use?

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

Is this housing suitable for hazardous areas?

Yes, it is CSA certified as Type 4 and explosion-proof for Class I, Divisions 1 and 2, Groups C and D.

What material is the housing made of?

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

Does it comply with environmental regulations?

Yes, it complies with RoHS Directive 2011/65/EU.

Product Support and Availability

The 21000-28-00-00-039-04-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. We provide original factory packaging and a 12-month warranty.