21000-28-05-00-076-04-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-05-00-076-04-02?

When hazardous area monitoring demands reliable vibration measurement, the 21000-28-05-00-076-04-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is part of the 21000 series, designed for externally mounted probes in harsh industrial environments. It features an aluminum body with a 304 stainless steel sleeve, ensuring durability and corrosion resistance. The assembly includes a 3300 XL 8 mm probe with selectable hazardous area approvals, making it suitable for explosion-proof applications.

Key Features and Technical Specs

• Probe Type: 3300 XL 8 mm proximity probe with connector.
• Cable Length: 0.5 m (20 in) probe cable for flexible installation.
• Probe Penetration: 7.6 in (076 suffix) for deep mounting requirements.
• Mounting Thread: 3/4-14 NPT for secure fitting.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum Dimension (C+D): 13.5 in (34.3 mm) with visible probe.
• Certifications: CSA Type 4 enclosure, explosion-proof for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, G, and Class III.

One distinctive spec is the 7.6 in probe penetration, which allows the sensor to reach deep into machinery for accurate vibration monitoring. This feature is critical in large rotating equipment where standard probes cannot access measurement points.

Real-World Applications

In petrochemical plants, the 21000-28-05-00-076-04-02 monitors compressor vibrations in explosive atmospheres. Similarly, it protects turbines in power generation facilities by providing early fault detection. Its CSA explosion-proof rating ensures safe operation in Class I Division 1 areas, reducing downtime risks. Moreover, the housing meets API 670 standards, making it ideal for refinery applications where compliance is mandatory.

Installation Guide

Begin by selecting a mounting location that allows the 3/4-14 NPT thread to engage fully. Use the included thread seal to prevent leakage. Connect the 0.5 m probe cable to the reverse mount probe, ensuring no kinks or sharp bends. For hazardous areas, follow the wiring diagram provided in the CSA certification drawing 140979 to maintain non-incendive circuits. Tighten the dome cover securely to maintain the Type 4 enclosure rating.

Routine Care and Reliability

Inspect the O-rings and thread seal annually for wear, as these components maintain the explosion-proof integrity. Clean the aluminum body with a damp cloth to remove debris, but avoid solvents that may damage seals. The stainless steel sleeve resists corrosion, extending service life in wet environments. Regular checks of the probe cable for abrasion help prevent false readings.

Common Questions About the 21000-28-05-00-076-04-02

Q: What is the maximum ambient temperature for this housing?

A: The CSA rating specifies T5 @ Ta = -50°C to +40°C and T4 @ Ta = -50°C to +80°C, depending on the temperature class.

Q: Can I use this assembly with a standoff adapter?

A: This configuration has a standoff adapter option of 00, meaning no standoff adapter is included. If needed, order separately.

Q: Is the probe cable replaceable?

A: The 0.5 m cable is integral to the probe assembly; contact Petro Auto Tech for replacement options if damaged.

Q: What is the weight without fittings?

A: The typical weight is 1.1 kg (2.4 lb) without conduit fittings.

Q: Does this model comply with RoHS?

A: Yes, it complies with RoHS Directive 2011/65/EU.

Product Support and Availability

The 21000-28-05-00-076-04-02 is in stock and ready to ship from Petro Auto Tech. We offer new and original factory-packed units with a 12-month warranty. Contact our team for technical documentation or ordering assistance.