Bently Nevada 21000-28-05-00-085-03-02 | 21000 Proximity Probe

21000-28-05-00-085-03-02 Proximity Probe Housing | Bently Nevada

Product Introduction

The Bently Nevada 21000-28-05-00-085-03-02 proximity probe housing assembly offers a rugged yet lightweight solution for mounting 3300 XL 8 mm proximity probes on turbines, compressors, and pumps. This aluminum-bodied housing features selectable hazardous area approvals, making it exceptionally versatile for global industrial applications.

This complete assembly includes a dome cover that screws into the main housing body, threaded ports for conduit connections, a probe sleeve of optional length, O-rings, a reverse mount proximity probe, a thread seal, and optional conduit fittings. The integrated design simplifies installation while ensuring reliable machinery condition monitoring in demanding environments.

Additionally, the 21000-28-05-00-085-03-02 fully complies with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings. It also carries CSA Type 4 enclosure certification, providing weatherproof and corrosion-resistant protection for outdoor and washdown applications.

Technical Specifications

Understanding the suffix code breakdown is essential for verifying the exact configuration of the 21000-28-05-00-085-03-02 model. Each segment defines a specific feature:

• Probe Option (28) : Designed for a 3300 XL 8 mm probe with selectable hazardous area approvals.

• Probe Cable Length (05) : Includes a 0.5-meter (20-inch) probe cable.

• Standoff Adapter (00) : Supplied without a standoff adapter .

• Probe Penetration (085) : Delivers 8.5 inches of probe penetration.

• Fitting Option (03) : Comes with 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 1/8–3/16 in, 1/4–5/16 in, and 5/16–3/8 in.

• Mounting Thread (02) : Equipped with a 3/4-14 NPT mounting thread (required when standoff adapter is 00).

For certain combinations of C plus D options, a flag label may display the probe P/N and S/N when only a small section of the probe cable remains visible. The maximum (C) plus (D) dimension with visible probe information is 13.5 inches (34.3 cm), though this configuration does not display such information.

Material Composition and Mechanical Parameters

The 21000-28-05-00-085-03-02 uses a carefully engineered material combination that balances strength, weight, and corrosion resistance.

The aluminum body delivers significant weight savings over all-stainless alternatives, making installation and maintenance more manageable. Meanwhile, the 304 stainless steel sleeve ensures excellent durability and wear resistance at the probe interface. This thoughtful combination provides long service life even in corrosive or demanding environments.

Hazardous Area Approvals and Certifications

The 21000-28-05-00-085-03-02 carries extensive hazardous area certifications, making it suitable for use in potentially explosive atmospheres worldwide.

North American Approvals (CSA Certified) :

• Class I, Divisions 1 and 2, Groups C and D : Suitable for environments with flammable gases or vapors.

• Class II, Divisions 1 and 2, Groups E, F and G : Suitable for combustible dust environments.

• Class III : Suitable for ignitable fibers or flyings.

• Enclosure Type 4 : Weatherproof and corrosion-resistant.

• Temperature Codes : T5 @ Ta = -50°C to +40°C; T4 @ Ta = -50°C to +80°C.

The circuit is non-incendive when connected per drawing 140979. Additionally, the housing complies with the European Community's RoHS Directive 2011/65/EU .

Please note that CA housings (with the "CA" prefix) can only be ordered for North American end users. For all other countries, the standard 21000-28-05-00-085-03-02 must be ordered as specified. You can order hazardous area approved proximity probes with 21000 aluminum housings for intrinsically safe applications, providing flexibility for various safety requirements.

Installation Guidelines

Proper installation of the 21000-28-05-00-085-03-02 ensures optimal measurement accuracy and long-term reliability. Follow these recommendations:

First, confirm that the mounting thread (3/4-14 NPT ) matches your application's mounting hole specifications. This thread size is mandatory when the standoff adapter option is 00.

Next, verify that the probe cable length (0.5 meters ) and probe penetration depth (8.5 inches ) suit your machinery's dimensional requirements. The penetration depth directly affects the probe's sensing zone and signal linearity.

When installing the cable seal grip, select the appropriate grommet size for your cable diameter from the three provided options: 1/8–3/16 inches, 1/4–5/16 inches, or 5/16–3/8 inches. Ensure a proper seal to maintain the housing's explosion-proof integrity.

The dome cover should screw securely into the main body, and all conduit connections must be properly sealed. For hazardous area installations, follow all relevant local regulations and use appropriately certified installation practices.

Packaging List

Each 21000-28-05-00-085-03-02 order includes the following items:

• 1 × Aluminum housing body with 304 stainless steel sleeve

• 1 × Dome cover

• 1 × Probe sleeve (optional length)

• 1 × Thread seal

• 1 × Reverse mount proximity probe

• 1 × 3/4-14 NPT plug

• 1 × 3/4-14 to 1/2-14 NPT reducer

• 1 × Cable seal grip with three grommet sizes (1/8–3/16 in, 1/4–5/16 in, 5/16–3/8 in)

• 1 × O-rings set

• 1 × Installation instruction sheet

Note: The packaging does not include calibration certificates or additional warranty documentation beyond the 12-month factory warranty.

Shipping Information

All orders ship via FedEx , UPS , or DHL . We select the most suitable carrier based on your destination and delivery timeline. Tracking numbers are provided promptly after dispatch.

Frequently Asked Questions

1. Which probe works with the 21000-28-05-00-085-03-02 housing?

This housing is specifically engineered for the 3300 XL 8 mm probe with selectable hazardous area approvals. Using other probe models may compromise sealing performance, measurement accuracy, or safety certifications.

2. What hazardous area approvals does this housing carry?

The housing holds CSA certification for Class I, Divisions 1 and 2, Groups C and D; Class II, Divisions 1 and 2, Groups E, F and G; and Class III environments. It also meets Enclosure Type 4 requirements.

3. What does fittings option 03 include?

Option 03 provides one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with three interchangeable grommets for cable diameters ranging from 1/8 inch to 3/8 inch.

4. Why does this model have no standoff adapter?

Option code 00 for the standoff adapter means this housing mounts directly without an extended standoff. This configuration suits applications where space constraints or measurement geometry do not require additional offset.

5. How do I read the full model number 21000-28-05-00-085-03-02?

Each segment defines a specific configuration: probe option (28), cable length (05), standoff adapter (00), penetration depth (085 = 8.5 inches), fittings (03), and mounting thread (02). Refer to the Technical Specifications section above for the complete breakdown.