21000-16-05-00-039-03-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

Introduction to the Bently Nevada 21000-16-05-00-039-03-02

When machine vibration monitoring demands a robust and precise solution, the 21000-16-05-00-039-03-02 from Bently Nevada delivers. This proximity probe housing assembly is engineered for industrial environments where accuracy and durability are non-negotiable. With a 3300 XL 8 mm probe and a 0.5 m (20 in) cable, it provides reliable data for critical rotating machinery.

Part of the trusted 21000 series, this model combines an aluminum body with a 304 stainless steel sleeve. It supports a maximum probe penetration (C plus D) of 13.5 in (34.3 cm) when using the 0.5 m cable. The assembly weighs 1.1 kg (2.4 lb) typical, without fittings, making it manageable for field installation.

Key Features and Technical Specifications

• Probe Option: 3300 XL 8 mm probe with connector
• Probe Cable Length: 0.5 m (20 in)
• Probe Penetration (D Dimension): 3.9 in (039 suffix)
• Fittings: One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, cable seal grip with grommets
• Mounting Thread: 3/4-14 NPT
• Material: Aluminum body with 304 stainless steel sleeve
• Weight: 1.1 kg (2.4 lb) typical, without fittings
• Hazardous Area Approvals: CSA certified for Class 1 Divisions 1 and 2 Groups C and D; Class 2 Divisions 1 and 2 Groups E, F, G; Class III; Enclosure Type 4; T5 @ Ta = -50 °C to +40 °C; T4 @ Ta = -50 °C to +80 °C
• Compliance: FCC Part 15, RoHS Directive 2011/65/EU

A standout feature is the 3.9 in probe penetration (D dimension), which allows precise positioning within the machine case. This adjustment range of 13 mm (± 0.5 in) gives engineers flexibility to optimize sensor placement for accurate vibration readings.

Applications and Use Cases

Industries rely on the 21000-16-05-00-039-03-02 for monitoring rotating equipment such as turbines, compressors, and pumps. Its CSA explosion-proof certification makes it suitable for hazardous areas where safety is paramount. For example, in oil and gas facilities, this housing assembly provides non-incendive circuits when connected per drawing 140979, ensuring safe operation in Class 1 environments.

Moreover, the assembly complies with API 670 standards for externally mounted proximity probe housings. This makes it a preferred choice for applications that require adherence to industry best practices.

Installation and Setup

Installing the 21000-16-05-00-039-03-02 involves mounting it via the 3/4-14 NPT thread. For probe penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may be necessary to reduce side view or rear view effects. If the total probe penetration (C plus D) exceeds 300 mm (12 in), add sleeve support near the probe to prevent resonance. The adjustment range of the D dimension is 13 mm (± 0.5 in), allowing fine-tuning during setup.

The included fittings—a 3/4-14 NPT plug, a reducer to 1/2-14 NPT, and a cable seal grip with grommets—simplify conduit connections. Always follow the manufacturer's manual for wiring and torque specifications.

Maintenance and Reliability

Regular inspection of the 21000-16-05-00-039-03-02 ensures long-term reliability. Check the O-rings and thread seal for wear, especially in harsh environments. The aluminum body with stainless steel sleeve resists corrosion, but periodic visual checks help catch issues early. For hazardous area installations, verify that the enclosure maintains its Type 4 rating and that all fittings remain tight.

By following a routine maintenance schedule, you extend the service life of the assembly and reduce unplanned downtime. This proactive approach aligns with cost-benefit goals, as it minimizes replacement costs and keeps machinery running smoothly.

Compatibility and Integration

The 21000-16-05-00-039-03-02 integrates with Bently Nevada monitoring systems that accept 8 mm proximity probes. It works with standard 3300 XL series electronics. The assembly's CSA certification ensures compatibility with intrinsically safe barriers when used in hazardous areas. For non-hazardous applications, it connects directly to compatible monitors without additional hardware.

Always verify the probe cable length and penetration requirements against your system's specifications. The 0.5 m cable is ideal for installations where the probe is close to the monitor or junction box.

Frequently Asked Questions

Q: What is the probe type used in the 21000-16-05-00-039-03-02?

A: The assembly uses a 3300 XL 8 mm probe with a connector, as indicated by the 16 suffix code.

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

A: With the 0.5 m cable, the maximum C plus D dimension is 13.5 in (34.3 cm). The D dimension is 3.9 in.

Q: Is the 21000-16-05-00-039-03-02 suitable for hazardous areas?

A: Yes, it is CSA certified for explosion-proof applications in Class 1 Divisions 1 and 2 Groups C and D, among others. It is rated Type 4 enclosure.

Q: What mounting thread does this assembly use?

A: The mounting thread is 3/4-14 NPT, which defaults to this option when no standoff adapter is selected.

Q: What fittings are included with the 21000-16-05-00-039-03-02?

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

Product Support and Availability

The 21000-16-05-00-039-03-02 is available as new and original in factory packing from Petro Auto Tech. It comes with a 12-month factory warranty. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.