21000-16-10-00-077-03-02 | Bently Nevada 8 mm Probe Housing Assembly

What Makes the 21000-16-10-00-077-03-02 Essential for Vibration Monitoring?

When rotating machinery demands precise, continuous vibration monitoring in hazardous environments, the 21000-16-10-00-077-03-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is engineered for external mounting, combining a 3300 XL 8 mm probe with a 1.0 m (39 in) cable and a 7.7 in probe penetration. Its aluminum body with 304 stainless steel sleeve ensures durability, while CSA explosion-proof certification makes it suitable for Class 1 Divisions 1 and 2 areas. For engineers seeking reliable machine protection, this assembly offers a proven design compliant with API 670 standards.

Key Features and Technical Specs of the 21000-16-10-00-077-03-02

• Probe Type: 3300 XL 8 mm proximity probe with connector.
• Cable Length: 1.0 m (39 in) probe cable.
• Probe Penetration (D Dimension): 7.7 in (077).
• Mounting Thread: 3/4-14 NPT.
• Fittings Included: 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 1/8 to 3/8 inches.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum Probe Cable Length (C + D): 17.0 in (43.18 cm) with visible probe P/N and S/N; 32.9 in (83.5 cm) maximum overall.

A distinctive feature is the adjustable probe penetration range of 13 mm (± 0.5 in), allowing fine-tuning during installation to optimize measurement accuracy. This flexibility is critical for minimizing side view effects in tight machine casings.

Industry Applications and Use Cases

In petrochemical refineries, the 21000-16-10-00-077-03-02 is commonly used to monitor shaft vibration on compressors and turbines. Its explosion-proof rating (Class 1 Divisions 1 and 2 Groups C and D) ensures safe operation in volatile atmospheres. Similarly, power generation plants rely on this assembly for continuous bearing vibration monitoring, where the stainless steel sleeve resists corrosion. The housing also meets API 670 standards for externally mounted proximity probes, making it a preferred choice for critical rotating equipment.

Installation and Setup Guidance

For optimal performance, mount the housing using the 3/4-14 NPT thread. If probe penetration (C plus D) exceeds 12 in (300 mm), add sleeve support near the probe to prevent resonance. When the penetration length is between 1.0 and 2.0 inches, counter boring the machine case may be necessary to reduce side view effects. The included cable seal grip accommodates cable diameters from 1/8 to 3/8 inches, ensuring a secure environmental seal. Always follow Bently Nevada's installation manual for torque specifications and wiring details.

Maintenance and Reliability Tips

Regular inspection of the O-rings and thread seal is recommended to maintain the CSA Type 4 enclosure rating. The aluminum body and stainless steel sleeve resist wear in harsh environments, but periodic checks for corrosion or mechanical damage extend service life. For cost-effective operation, verify that the probe cable is not kinked or stressed, as this can affect signal integrity. The assembly's robust construction minimizes downtime, supporting long-term reliability in continuous-duty applications.

Compatibility and Integration

The 21000-16-10-00-077-03-02 integrates seamlessly with Bently Nevada monitoring systems that accept 3300 XL 8 mm proximity probes. It is designed for use with compatible extension cables and monitors, ensuring accurate vibration data transmission. The housing's CSA certification for hazardous areas allows it to be paired with intrinsically safe barriers when required. For system integration, refer to Bently Nevada's wiring diagrams and compatibility lists.

Frequently Asked Questions About the 21000-16-10-00-077-03-02

Q: What is the maximum cable length for the 21000-16-10-00-077-03-02?

A: The probe cable length is 1.0 m (39 in). The maximum overall length (C + D) with visible probe P/N and S/N is 17.0 in (43.18 cm), and the maximum overall dimension is 32.9 in (83.5 cm).

Q: Is the 21000-16-10-00-077-03-02 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, Class 2 Divisions 1 and 2 Groups E, F, and G, and Class III. It is rated T5 @ Ta = -50 °C to +40 °C and T4 @ Ta = -50 °C to +80 °C, with Enclosure Type 4.

Q: What fittings come with the 21000-16-10-00-077-03-02?

A: The assembly 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 1/8 to 3/16 inches, 1/4 to 5/16 inches, and 5/16 to 3/8 inches.

Q: Can the probe penetration be adjusted after installation?

A: Yes, the probe penetration option D has an adjustment range of 13 mm (± 0.5 in), allowing fine-tuning to optimize measurement accuracy.

Product Support and Availability

The 21000-16-10-00-077-03-02 is available as new and original in factory packing from Petro Auto Tech. In stock and ready to ship, this assembly comes with a 12-month factory warranty. Contact Petro Auto Tech for lifecycle status and ordering details before purchasing.