21000-28-05-00-077-03-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

Introduction to the 21000-28-05-00-077-03-02

When industrial environments demand reliable vibration monitoring, the 21000-28-05-00-077-03-02 from Bently Nevada delivers precision. This proximity probe housing assembly is part of the 21000 series, engineered for hazardous area applications. It combines an aluminum body with a 304 stainless steel sleeve for durability. The assembly includes a 3300 XL 8 mm probe with a 0.5 m (20 in) cable. It also features a 7.7 in probe penetration and a 3/4-14 NPT mounting thread. This unit is new and original in factory packing, backed by a 12-month warranty.

Key Features and Technical Specs of the 21000-28-05-00-077-03-02

• Probe Option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Cable Length: 0.5 m (20 in) probe cable.
• Probe Penetration: 7.7 in (077 suffix).
• Fitting Option: One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable sizes 1/8 to 3/8 inches.
• Mounting Thread: 3/4-14 NPT (suffix 02).
• 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 0.5 m cable.
• Certifications: CSA Type 4 enclosure, explosion-proof for hazardous areas; RoHS compliant.

A distinctive spec is the 8 mm probe, which provides high-resolution measurements for rotating machinery. This ensures accurate vibration data in tight spaces.

Applications and Use Cases

The 21000-28-05-00-077-03-02 is ideal for monitoring shaft vibration in turbines, compressors, and pumps. It is fully compliant with API 670 standards for externally mounted proximity probe housings. Consequently, it suits oil and gas, power generation, and petrochemical plants. In these settings, the explosion-proof rating ensures safe operation in Class I Division 1 and 2 areas. Moreover, the CSA certification for Groups C, D, E, F, and G broadens its applicability.

Installation and Setup

Installing the 21000-28-05-00-077-03-02 requires proper mounting using the 3/4-14 NPT thread. The fitting kit includes a reducer and cable seal grip for conduit connections. Ensure the probe sleeve length matches the required penetration. Use the provided grommets to seal cables between 1/8 and 3/8 inches. Always follow Bently Nevada guidelines for hazardous area wiring. The assembly is designed for external mounting without standoff adapters.

Maintenance and Reliability

Regular inspection of the housing and probe cable is recommended. The aluminum and stainless steel construction resists corrosion in harsh environments. Check O-rings and seals periodically to maintain the Type 4 enclosure rating. This proactive approach extends service life and reduces downtime. For optimal reliability, verify the probe gap per manufacturer specifications.

Compatibility and Integration

The 21000-28-05-00-077-03-02 integrates with Bently Nevada monitoring systems. It works with 3300 XL series proximitors and rack-based monitors. The assembly supports non-incendive circuits when connected per drawing 140979. For intrinsically safe applications, order hazardous area approved probes. The housing is CSA certified for North American installations.

FAQ about the 21000-28-05-00-077-03-02

What is the probe size of the 21000-28-05-00-077-03-02?

The probe is a 3300 XL 8 mm proximity probe.

What is the cable length for this housing assembly?

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

What certifications does this product hold?

It is CSA certified as a Type 4 enclosure for explosion-proof applications and RoHS compliant.

What is the mounting thread option?

The mounting thread is 3/4-14 NPT (suffix 02).

What is the typical weight without fittings?

The typical weight is 1.1 kg (2.4 lb).

Product Support and Availability

The 21000-28-05-00-077-03-02 is in stock and ready to ship from Petro Auto Tech. Contact us for current lifecycle status and availability. We provide new and original factory-packed units with a 12-month warranty.