21000-28-05-35-020-04-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-05-35-020-04-02?

When you need a reliable housing for vibration monitoring in explosive environments, the 21000-28-05-35-020-04-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly combines an aluminum body with a 304 stainless steel sleeve, ensuring durability in harsh industrial settings. It is part of the 21000 series and is designed for use with 3300 XL 8 mm probes, offering selectable hazardous area approvals.

With a probe cable length of 0.5 m (20 in) and a standoff adapter of 3.5 in, this assembly meets API 670 standards for externally mounted housings. The 21000-28-05-35-020-04-02 is certified as a CSA Type 4 enclosure and is rated explosion proof for Class I Divisions 1 and 2 Groups C and D, as well as Class II Divisions 1 and 2 Groups E, F, and G.

Key Features & Technical Specs

• Probe option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Probe cable length: 0.5 m (20 in) for flexible installation.
• Standoff adapter: 3.5 in to position the probe correctly.
• Probe penetration: 2 in for accurate measurement.
• Fitting option: One 3/4-14 NPT plug for secure conduit connection.
• Mounting thread: 3/4-14 NPT for easy integration.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.

One distinctive spec is the 8 mm probe size, which allows for precise proximity measurements in tight spaces, reducing installation complexity.

Applications & Use Cases

In petrochemical plants and refineries, the 21000-28-05-35-020-04-02 is ideal for monitoring rotating machinery such as pumps and compressors. Because it is CSA certified for explosion-proof areas, it can be used in Class I and Class II hazardous locations. Furthermore, its compliance with API 670 ensures it meets industry standards for externally mounted proximity probe housings. For example, in a gas processing facility, this housing assembly provides reliable vibration data even in corrosive environments.

Installation & Setup

To install the 21000-28-05-35-020-04-02, first mount the housing using the 3/4-14 NPT thread. Then, connect the probe cable and secure the fitting with the provided NPT plug. Ensure the standoff adapter is set to 3.5 in for proper probe positioning. Always follow Bently Nevada's guidelines for wiring and mounting to maintain hazardous area certifications.

Maintenance & Reliability

Regular inspection of the O-rings and thread seal helps maintain the explosion-proof rating. Because the housing uses an aluminum body with a stainless steel sleeve, it resists corrosion and extends service life. Periodic checks of the probe cable and connector ensure consistent signal quality. This proactive approach reduces downtime and lowers total cost of ownership.

Compatibility & Integration

The 21000-28-05-35-020-04-02 is compatible with Bently Nevada 3300 XL 8 mm proximity probes. It integrates with monitoring systems that accept standard proximity probe inputs. For hazardous area installations, the housing can be ordered with intrinsically safe probes, ensuring safe operation in explosive environments.

FAQs about the 21000-28-05-35-020-04-02

Q: What probe type does the 21000-28-05-35-020-04-02 support?

A: It supports the 3300 XL 8 mm probe with selectable hazardous area approvals.

Q: What is the cable length for this housing assembly?

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

Q: Is this housing assembly certified for hazardous areas?

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

Q: What materials are used in the housing?

A: The body is aluminum, and the sleeve is 304 stainless steel.

Q: What is the weight of the 21000-28-05-35-020-04-02?

A: It weighs 1.1 kg (2.4 lb) typical, without fittings.

Product Support & Availability

The 21000-28-05-35-020-04-02 is in stock and ready to ship from Petro Auto Tech. It comes as new and original in factory packing with a 12-month warranty. Please verify lifecycle status and availability with Petro Auto Tech before ordering.