21000-28-00-00-050-04-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the 21000-28-00-00-050-04-02

When unplanned downtime threatens production targets, the 21000-28-00-00-050-04-02 from Bently Nevada provides a robust solution for critical machinery protection. This proximity probe housing assembly is engineered for continuous vibration and position monitoring in harsh industrial environments. With its 3300 XL 8 mm probe and selectable hazardous area approvals, it delivers accurate data while reducing the risk of costly failures. The aluminum body with a 304 stainless steel sleeve ensures long-term durability, minimizing replacement expenses and extending service intervals.

Key Features and Technical Specs

• Probe Type: 3300 XL 8 mm probe with connector.
• Probe Cable Length: Not required (00).
• Standoff Adapter Length: None (00).
• Probe Penetration: 5 inches (050).
• Fittings: One 3/4-14 NPT plug only.
• Mounting Thread: 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.

A standout feature is the 5-inch probe penetration, which allows flexible installation depth adjustment of 13 mm (±0.5 in). This adjustability reduces the need for custom machining, saving both time and cost during setup.

Cost-Benefit and ROI

Investing in the 21000-28-00-00-050-04-02 lowers total ownership costs through several mechanisms. First, its rugged construction—aluminum body with stainless steel sleeve—resists corrosion and wear, reducing replacement frequency. Second, the CSA Type 4 enclosure rating ensures reliable operation in wet or dusty conditions, preventing false alarms that can trigger unnecessary shutdowns. Third, the optional hazardous area approvals eliminate the need for separate safety barriers in many applications, streamlining installation and reducing hardware expenses. Over a typical five-year lifecycle, these factors can cut maintenance and downtime costs by up to 30% compared to non-certified alternatives.

Applications and Use Cases

This housing assembly is ideal for rotating machinery such as compressors, turbines, and pumps in oil refineries, chemical plants, and power generation facilities. For example, in a refinery, the 21000-28-00-00-050-04-02 monitors shaft vibration on a critical compressor, providing early warning of bearing wear. This proactive detection prevents catastrophic failures that could cost hundreds of thousands in repairs and lost production. Additionally, its API 670 compliance makes it a standard choice for externally mounted probes in the petroleum industry.

Installation and Setup

Installing the 21000-28-00-00-050-04-02 is straightforward with the provided 3/4-14 NPT mounting thread and plug. For probe penetration lengths between 1.0 and 2.0 inches, you may need to counter bore the machine case to reduce side view effects. If the combined probe penetration (C plus D) exceeds 300 mm (12 inches), add sleeve support near the probe to prevent resonance. The adjustment range of 13 mm (±0.5 in) allows fine-tuning without additional parts, saving setup time.

Maintenance and Reliability

Regular inspection of the O-rings and thread seal ensures the housing remains explosion-proof. The aluminum body and stainless steel sleeve resist corrosion, but periodic checks for physical damage are recommended. Following the manufacturer's manual for cleaning and torque specifications extends service life. By adhering to these simple steps, you maximize the ROI from this durable assembly.

FAQ about the 21000-28-00-00-050-04-02

Q: What probe is included with the 21000-28-00-00-050-04-02?

A: It includes a 3300 XL 8 mm probe with a connector, selectable for hazardous area approvals.

Q: What is the maximum probe penetration length?

A: The probe penetration option D is set to 5 inches (050), with an adjustment range of 13 mm (±0.5 in).

Q: Is the housing certified for hazardous locations?

A: Yes, it is available with CSA approvals and rated explosion proof for hazardous areas.

Q: What material is the housing made of?

A: The body is aluminum with a 304 stainless steel sleeve.

Q: What mounting thread does the assembly use?

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

Product Support and Availability

The 21000-28-00-00-050-04-02 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 support or to confirm lifecycle status before ordering.