Bently Nevada 21000-28-05-45-020-03-02 Housing

Bently Nevada 21000 Proximity Probe Housing Assembly

Product Introduction

The 21000-28-05-45-020-03-02 is part of the Bently Nevada 21000 series. This series provides proximity probe housing assemblies for rotating equipment. Specifically, each assembly holds a reverse mount proximity probe. It also includes a dome cover, threaded conduit ports, and a probe sleeve. The housing shields the probe from harsh industrial conditions.

Furthermore, this model supports the 3300 XL 8 mm probe with selectable hazardous area approvals. The 3/4-14 NPT mounting thread ensures a secure fit. Meanwhile, the aluminum body with a 304 stainless steel sleeve delivers long-term durability. The assembly complies with API 670 for externally mounted probe housings.

Technical Specifications

The 21000-28-05-45-020-03-02 offers a specific configuration for vibration monitoring. First, the probe option code 28 means a 3300 XL 8 mm probe with selectable hazardous area approvals. Next, the cable length option 05 provides a 0.5 m (20 in) cable. In addition, the standoff adapter option is 45, which equals 4.5 in. The probe penetration option is 020, which equals 2 in.

Moreover, the adjustment range of probe penetration is 13 mm (± 0.5 in). For penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may be necessary. This step reduces probe side view or rear view effects. If the total penetration exceeds 300 mm (12 in), add sleeve support near the probe. This support prevents resonance from occurring.

Mechanical and Environmental Parameters

The housing uses an aluminum body with a 304 stainless steel sleeve. The mounting thread is 3/4-14 NPT. The fitting option 03 includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and one cable seal grip with grommets. These grommets fit cable sizes from 1/8 to 3/16 inches, 1/4 to 5/16 inches, and 5/16 to 3/8 inches.

Additionally, the maximum (C) + (D) dimension with visible probe is 13.5 in (34.3 cm). For a 0.5 m cable, the probe P/N and S/N are not visible. The typical weight is 1.1 kg (2.4 lb) without fittings. The assembly carries CSA approvals for hazardous areas. It meets Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, and Class III. The enclosure type is 4. Temperature ratings include T5 at -50 °C to +40 °C and T4 at -50 °C to +80 °C.

Installation Guide

Proper installation ensures reliable performance. First, verify the machine case has the correct thread for the 3/4-14 NPT mounting. Next, attach the 4.5 in standoff adapter to the housing body. Then, insert the probe sleeve into the housing. After that, connect the 3300 XL 8 mm probe to the cable. Finally, screw the dome cover onto the body and tighten the cable seal grip.

Besides, use the provided reducer if the conduit port requires a 1/2-14 NPT connection. For hazardous areas, follow drawing 140979 for non-incendive circuits. Meanwhile, keep the probe penetration within the specified adjustment range. If the total penetration exceeds 300 mm, add sleeve support. This action prevents resonance and maintains signal accuracy.

Packaging List

The package includes the following items. One 21000-28-05-45-020-03-02 proximity probe housing assembly. One 3300 XL 8 mm probe with connector. One 0.5 m (20 in) probe cable. One 4.5 in standoff adapter. One dome cover. One probe sleeve. One thread seal. One 3/4-14 NPT plug. One 3/4-14 to 1/2-14 NPT reducer. One cable seal grip with grommets. O-rings as required.

FAQ

What is the main function of this assembly?
The 21000-28-05-45-020-03-02 houses and protects a proximity probe. It ensures accurate measurement of shaft vibration and position.

Which probe does this model include?
This model includes a 3300 XL 8 mm probe with a 0.5 m (20 in) cable. The probe option code is 28.

What standoff adapter length does this model use?
This model uses a 4.5 in standoff adapter. The standoff adapter option code is 45.

Can I use this assembly in hazardous areas?
Yes, the housing carries CSA approvals for explosion-proof applications. It meets Class I, II, and III requirements.

How is this product shipped?
We ship this product via Fedex, UPS, or DHL. Each unit is packed in factory original packaging.