21000-16-10-15-085-03-02 Bently Nevada Explosion-Proof Housing

Product Overview

The Bently Nevada 21000-16-10-15-085-03-02 is a robust Proximity Probe Housing Assembly designed for external mounting on industrial machinery. This assembly provides an explosion-proof environment for a 3300 XL 8 mm reverse-mount probe, allowing for easy sensor adjustment or replacement without dismantling the machine. Constructed with a durable aluminum body and a 304 stainless steel sleeve, it is fully compliant with the API 670 Standard for externally mounted housings. This specific configuration features an 8.5-inch probe penetration depth and a 1.5-inch standoff adapter.

Technical Configuration

• Manufacturer: Bently Nevada (Baker Hughes)
• Full Model: 21000-16-10-15-085-03-02
• Internal Probe: 3300 XL 8 mm (1.0 meter cable length)
• Standoff Adapter: 1.5 in (38 mm) length
• Probe Penetration (D): 8.5 inches
• Fittings: -03 Option (NPT plug, reducer, and multi-size cable seal grip)
• Mounting Thread: 3/4-14 NPT (-02)
• Housing Material: Aluminum body with Type 4 enclosure rating

Technical Specifications

Mechanical Design & Functional Features

1. Precise Penetration Control: The 21000-16-10-15-085-03-02 utilizes an 8.5-inch (DDD=085) penetration depth combined with a 1.5-inch standoff adapter. The assembly offers a fine-tuning adjustment range of ± 13 mm (± 0.5 in), allowing technicians to precisely gap the internal 3300 XL probe against the shaft while the machine is online.

2. Hazardous Area Protection: Certified as an explosion-proof enclosure by CSA for North America (Class 1, Divisions 1 and 2), this housing protects vibration monitoring circuits in volatile environments. The Type 4 enclosure rating ensures the internal components remain dry and protected against environmental contaminants, meeting stringent industrial safety protocols.

3. Versatile Fitting Kit: The -03 fittings option provides a comprehensive installation set, including a 3/4-14 to 1/2-14 NPT reducer and a cable seal grip with three distinct grommet sizes. This ensures a liquid-tight seal for cable diameters ranging from 1/8 to 3/8 inches, facilitating secure conduit integration.

Installation Guidelines

Mounting Procedure: The housing installs via a 3/4-14 NPT thread. Ensure the standoff adapter is correctly seated to maintain the intended 8.5-inch penetration depth. If the combined length of the standoff and sleeve (C+D) exceeds 12 inches, sleeve support must be added near the probe tip to prevent mechanical resonance.

Sealing Integrity: The dome cover screws directly into the aluminum body. Always inspect the O-rings and thread seals during installation to maintain the CSA Type 4 rating. For hazardous area compliance, ensure all conduit connections follow local electrical codes for explosion-proof installations.

Probe Access: By removing the dome cover, the internal reverse-mount probe can be reached without removing the housing body from the machine case. This "external access" significantly reduces maintenance downtime.

Technical FAQs

Q: Can I use this housing in intrinsically safe circuits?
A: Yes, these housings are certified for use in intrinsically safe applications when paired with hazardous area approved proximity probes and appropriate barriers.

Q: What is the purpose of the 1.5-inch standoff adapter?
A: The standoff adapter provides necessary clearance between the housing body and the machine case, often required to accommodate insulation or to manage specific probe penetration depths.

Q: Does this housing meet API 670 standards?
A: Absolutely. The Bently Nevada 21000 series is designed to be fully compliant with the American Petroleum Institute (API) 670 Standard for vibration monitoring system hardware.