21000-16-05-15-072-03-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the Bently Nevada 21000-16-05-15-072-03-02

When machinery protection demands precise vibration monitoring, the 21000-16-05-15-072-03-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is part of the 21000 series, designed for externally mounted probes in hazardous areas. With a 3300 XL 8 mm probe and a 0.5 m (20 in) cable, it provides accurate displacement measurements. Engineers rely on this assembly for its explosion-proof certification and compliance with API 670 standards. It is a critical component for rotating machinery monitoring systems.

Key Features and Technical Specifications

• Probe Option: 3300 XL 8 mm probe with connector
• Probe Cable Length: 0.5 m (20 in)
• Standoff Adapter: 1.5 in (38 mm)
• Probe Penetration (D Dimension): 7.2 in
• Mounting Thread: 3/4-14 NPT
• Fittings: One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, one 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
• 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

One distinctive feature is the 7.2 in probe penetration, which allows deep insertion into machine casings for accurate measurement. This spec is critical for installations where the probe must reach the target shaft surface without interference.

Applications and Use Cases

In the oil and gas industry, the 21000-16-05-15-072-03-02 is commonly used for vibration monitoring on pumps and compressors. It is also suitable for steam turbines and generators in power plants. The CSA explosion-proof rating makes it ideal for hazardous environments like refineries and chemical processing facilities. Additionally, its compliance with API 670 ensures reliable performance in critical rotating machinery applications. For example, in a refinery, this housing assembly can monitor compressor shaft vibration to prevent unplanned downtime.

Installation and Setup

Mounting the 21000-16-05-15-072-03-02 requires a 3/4-14 NPT threaded hole in the machine case. For probe penetration lengths between 1.0 and 2.0 inches, counter boring may be necessary to reduce side view effects. If the combined probe cable length (C plus D) exceeds 300 mm (12 in), sleeve support near the probe is required to prevent resonance. The standoff adapter of 1.5 in (38 mm) provides proper positioning. Always follow the manufacturer's manual for torque specifications and wiring connections.

Maintenance and Reliability

Regular inspection of the 21000-16-05-15-072-03-02 ensures long-term reliability. Check the O-rings and thread seal for wear during routine maintenance. The aluminum body with stainless steel sleeve resists corrosion in harsh environments. For hazardous area installations, verify the enclosure integrity per CSA requirements. Periodic cleaning of the probe tip and cable connections can prevent signal degradation. Following these practices extends the service life and reduces replacement costs.

Compatibility and Integration

The 21000-16-05-15-072-03-02 integrates with Bently Nevada monitoring systems and other vibration data acquisition equipment. It is compatible with 3300 XL 8 mm proximity probes and standard extension cables. The 3/4-14 NPT mounting thread fits most industrial machine ports. For hazardous area use, ensure the system is connected per drawing 140979 for non-incendive circuits. This assembly works with both new installations and retrofit projects.

FAQs about the 21000-16-05-15-072-03-02

Q: What is the probe cable length for this model?

A: The probe cable length is 0.5 m (20 in).

Q: What is the probe penetration dimension?

A: The probe penetration (D dimension) is 7.2 in.

Q: What hazardous area approvals does it have?

A: It is CSA certified for Class 1 Divisions 1 and 2 Groups C and D, Class 2 Divisions 1 and 2 Groups E, F, G, and Class III, with Enclosure Type 4 and temperature ratings T5 and T4.

Q: What materials are used in the housing?

A: The housing has an aluminum body with a 304 stainless steel sleeve.

Q: What is the mounting thread size?

A: The mounting thread is 3/4-14 NPT.

Product Support and Availability

The 21000-16-05-15-072-03-02 is available from Petro Auto Tech in new and original factory packing. It ships with a 12-month factory warranty. For lifecycle status and ordering, please contact Petro Auto Tech directly.