21000-16-05-00-105-03-02 Bently Nevada 10.5in Probe Housing

Product Overview

The Bently Nevada 21000-16-05-00-105-03-02 is a professional-grade Proximity Probe Housing Assembly designed for external mounting on industrial machinery cases. This assembly provides a secure, explosion-proof enclosure for a reverse-mount 3300 XL 8 mm probe, facilitating sensor adjustment or replacement without machine disassembly. Constructed with a robust aluminum body and a 304 stainless steel sleeve, it is fully compliant with the API 670 Standard. This specific configuration features a 10.5-inch probe penetration depth and a direct-mount design with no standoff adapter.

Technical Configuration

• Manufacturer: Bently Nevada (Baker Hughes)
• Full Model: 21000-16-05-00-105-03-02
• Internal Probe: 3300 XL 8 mm (0.5 meter cable length)
• Standoff Adapter: None (Option 00)
• Probe Penetration (D): 10.5 inches (266.7 mm)
• Fittings: -03 Option (NPT plug, reducer, and multi-size cable seal grip)
• Mounting Thread: 3/4-14 NPT (-02)
• Housing Material: Aluminum with CSA Type 4 rating

Technical Specifications

Mechanical Design & Functional Features

1. Direct-Mount Penetration: The 21000-16-05-00-105-03-02 is engineered for applications requiring a 10.5-inch penetration depth without the use of a standoff adapter. The internal 3300 XL probe can be fine-tuned with an adjustment range of ± 13 mm (± 0.5 in), ensuring the optimal gap setting is achieved for precise shaft vibration monitoring.

2. API 670 Compliance: This housing assembly adheres strictly to the American Petroleum Institute’s (API) 670 Standard, ensuring reliability in critical petroleum and chemical industry applications. The CSA Type 4 enclosure provides a liquid-tight, dust-tight seal, protecting the reverse-mount probe from harsh external environments while maintaining explosion-proof safety.

3. Advanced Fitting Kit: The included -03 fitting option provides a 3/4-14 NPT plug and reducer, alongside a specialized cable seal grip. The multi-size grommet set allows for a high-integrity seal across cable diameters from 1/8 to 3/8 inches, preventing moisture ingress into the conduit system.

Installation Guidelines

Mounting Procedure: Secure the housing using the 3/4-14 NPT mounting thread. Since this configuration lacks a standoff adapter, ensure the machine case surface is prepared for a direct-mount NPT connection. For penetrations greater than 12 inches, Bently Nevada recommends adding sleeve support; at 10.5 inches, this assembly remains inherently stable but should be inspected for resonance during commissioning.

Maintenance Accessibility: One of the primary advantages of the 21000 series is the ability to service the probe without removing the entire housing or opening the machine. Simply unscrew the dome cover to access the 0.5-meter probe cable and reverse-mount assembly.

Hazardous Areas: Always ensure the dome cover is fully tightened and the O-rings are lubricated with a compatible grease to maintain the explosion-proof rating. The circuit is considered non-incendive when connected per Bently Nevada installation drawing 140979.

Technical FAQs

Q: Why is the probe cable length 0.5 meters in this housing?
A: The 0.5-meter cable is specifically chosen for use within housing assemblies where the connection to the extension cable occurs inside the enclosure, minimizing excess cable clutter.

Q: Can this aluminum housing be used in corrosive offshore environments?
A: While the aluminum body is highly durable and Type 4 rated, for extreme corrosive environments, Bently Nevada offers the 24701 series, which features a full stainless steel body.

Q: What happens if I need to adjust the probe gap after installation?
A: The probe penetration depth (D) can be manually adjusted by ± 0.5 inches, allowing you to optimize the gap setting without needing to re-machine any components.