21000-00-00-00-087-03-02 | Bently Nevada 8.7 in Probe Housing Assembly

Overview of the 21000-00-00-00-087-03-02 Bently Nevada Proximity Probe Housing Assembly

When hazardous area monitoring demands robust housing for vibration probes, the 21000-00-00-00-087-03-02 from Bently Nevada delivers reliable protection. This proximity probe housing assembly is engineered for external mounting per API 670 standards, ensuring accurate measurement in demanding industrial environments.

Part of the 21000 series, the 21000-00-00-00-087-03-02 features an aluminum body with a 304 stainless steel sleeve. It weighs 1.1 kg (2.4 lb) typical without fittings, making it sturdy yet manageable for installation. The assembly includes a dome cover, threaded ports for conduit connections, a probe sleeve, O-rings, a reverse mount proximity probe, a thread seal, optional conduit fittings, and an optional standoff adapter.

Key Features and Technical Specifications

• Probe Penetration: 8.7 inches (087 suffix)
• Mounting Thread Option: 03 includes two plugs, one 3/4-14 NPT fitting, one 3/4-14 to 1/2-14 NPT SST reducer, and one cable seal grip with grommets for cable sizes 1/8-3/16, 1/4-5/16, and 5/16-3/8 inches
• Mounting Thread Option: 02 is 3/4-14 NPT (required if ordering standoff adapter option)
• Material: Aluminum body with 304 stainless steel sleeve
• Weight: 1.1 kg (2.4 lb) typical, without fittings
• Certifications: CSA explosion-proof for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, Class III, Enclosure Type 4, T5 @ Ta = -50°C to +40°C, T4 @ Ta = -50°C to +80°C
• Compliance: RoHS Directive 2011/65/EU, API 670 Standard

One distinctive spec is the 8.7 inch probe penetration, which allows deep insertion into machine casings for accurate proximity measurements. This feature directly supports reliable vibration monitoring in turbines, compressors, and pumps.

Real-World Applications

In petrochemical plants, the 21000-00-00-00-087-03-02 is ideal for externally mounting proximity probes on rotating machinery. Its CSA explosion-proof rating makes it suitable for Class I Division 1 hazardous areas where flammable gases are present. Similarly, in power generation facilities, this housing assembly provides robust protection for vibration sensors on steam turbines and generators. For oil and gas pipelines, the API 670 compliance ensures compatibility with industry-standard monitoring systems.

Installation and Setup

Mount the housing using the provided 3/4-14 NPT fitting or the optional 3/4-14 to 1/2-14 NPT reducer. Secure the cable seal grip with the appropriate grommet for your cable diameter (1/8-3/16, 1/4-5/16, or 5/16-3/8 inches). Ensure the O-rings are seated properly to maintain the explosion-proof seal. For standoff adapter applications, use mounting thread option 02 (3/4-14 NPT). Always follow the manufacturer's manual for torque specifications and wiring per drawing 140979 for non-incendive circuits.

Maintenance and Reliability

Inspect the O-rings and seals periodically for wear or damage to maintain the enclosure's Type 4 rating. Verify that the cable seal grip remains tight and the grommet is intact. The aluminum and stainless steel construction resists corrosion in harsh environments, extending service life. Regular inspection per the manufacturer's safety manual ensures continued reliable operation.

Compatibility and Integration

The 21000-00-00-00-087-03-02 is designed for use with Bently Nevada proximity probes and monitoring systems. It accepts reverse mount proximity probes and is compatible with optional standoff adapters. The housing is certified as CSA Type 4 enclosure, fully compliant with API 670 for externally mounted probe housings. For intrinsically safe applications, order hazardous area approved proximity probes with the 21000 aluminum housing.

Troubleshooting and Common Issues

If the housing fails to maintain an explosion-proof seal, check the O-rings for cracks or deformation. Ensure the cable seal grip grommet matches the cable diameter exactly. Loose conduit fittings can compromise the Type 4 rating; tighten them to the recommended torque. If the probe penetration depth is insufficient, verify that the 8.7 inch sleeve is correctly installed. For non-incendive circuit compliance, confirm wiring per drawing 140979.

FAQs about the 21000-00-00-00-087-03-02

Q: What is the probe penetration of the 21000-00-00-00-087-03-02?

A: The probe penetration is 8.7 inches, as indicated by the 087 suffix code.

Q: What certifications does this housing assembly have?

A: It is CSA certified explosion-proof for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, Class III, Enclosure Type 4, with temperature codes T5 @ Ta = -50°C to +40°C and T4 @ Ta = -50°C to +80°C.

Q: What mounting thread options are available?

A: Option 03 includes two plugs, one 3/4-14 NPT fitting, one 3/4-14 to 1/2-14 NPT SST reducer, and a cable seal grip with grommets. Option 02 is 3/4-14 NPT, required if ordering a standoff adapter.

Q: What materials are used in this housing?

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

Q: Is this housing RoHS compliant?

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

Product Support and Availability

The 21000-00-00-00-087-03-02 is available in stock and ready to ship from Petro Auto Tech. Contact our team for ordering assistance and technical support. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.