21000-28-05-20-065-03-02 | Bently Nevada 0.5 m Probe Housing Assembly

Introduction to the 21000-28-05-20-065-03-02

When vibration monitoring demands robust protection in hazardous areas, the 21000-28-05-20-065-03-02 from Bently Nevada delivers a proven solution. This proximity probe housing assembly combines an aluminum body with a 304 stainless steel sleeve, ensuring durability in harsh industrial environments. It is part of the 21000 series, designed for externally mounted proximity probes in rotating machinery applications.

Key Features and Technical Specifications

• Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Probe cable length of 0.5 m (20 in) for flexible installation.
• Standoff adapter length of 2 in for proper probe positioning.
• Probe penetration of 6.5 in to accommodate machine casing thickness.
• Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and cable seal grip with grommets for cable sizes 1/8 to 3/8 inches.
• Mounting thread option 3/4-14 NPT for secure attachment.
• Typical weight of 1.1 kg (2.4 lb) without fittings.
• CSA certified for explosion-proof applications in Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, and Class III.
• Enclosure Type 4 rated for outdoor and washdown environments.
• RoHS compliant per Directive 2011/65/EU.

Applications and Use Cases

Engineers rely on the 21000-28-05-20-065-03-02 for vibration monitoring of critical rotating equipment such as turbines, compressors, and pumps. Its explosion-proof certification makes it suitable for oil and gas refineries, chemical plants, and other hazardous locations. Additionally, the housing meets API 670 standards for externally mounted proximity probes, ensuring compatibility with industry-standard monitoring systems.

Installation and Setup

Mounting the housing requires a 3/4-14 NPT threaded port on the machine casing. The standoff adapter positions the probe at the correct gap, while the cable seal grip accommodates various cable diameters from 1/8 to 3/8 inches. Always follow the manufacturer's manual for proper torque and sealing to maintain the explosion-proof rating.

Maintenance and Reliability

Periodic inspection of the housing seals and cable connections helps maintain long-term reliability. The aluminum and stainless steel construction resists corrosion, reducing the need for frequent replacements. By choosing the 21000-28-05-20-065-03-02, operators minimize downtime and extend service intervals.

Frequently Asked Questions

What is the cable length of the 21000-28-05-20-065-03-02?

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

What mounting thread does this housing use?

It uses a 3/4-14 NPT mounting thread.

Is this housing certified for hazardous areas?

Yes, it is CSA certified for explosion-proof applications in Class I, II, and III hazardous locations.

What is the probe penetration depth?

The probe penetration is 6.5 in.

What materials are used in the housing?

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

Product Support and Availability

The 21000-28-05-20-065-03-02 is available as new and original in factory packing from Petro Auto Tech. It comes with a 12-month factory warranty. Contact Petro Auto Tech for current stock and lead times.