21000-34-05-20-039-04-02 | Bently Nevada Probe Housing

The Bently Nevada 21000-34-05-20-039-04-02 is a Probe Option for industrial control and automation applications.

Bently Nevada 21000-34-05-20-039-04-02 is a proximity probe housing assembly from the 21000 series, supplied with a 3300 XL 8 mm probe and connector protector. It is built for reliable, precise mounting of reverse-mount proximity probes on rotating machinery.

What Is the 21000-34-05-20-039-04-02?

This assembly consists of an aluminum body with a 304 stainless steel sleeve, a dome cover, O-rings, a thread seal, and a reverse-mount proximity probe. The 0.5 m probe cable connects to extension systems, while the 2.0 in standoff adapter and 3.9 in probe penetration set the probe tip position. The fitting option includes one 3/4-14 NPT plug only, and the mounting thread is 3/4-14 NPT.

Key Specifications at a Glance

• Probe option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals
• Probe cable length: 0.5 m (20 in)
• Standoff adapter: 2.0 in
• Probe penetration: 3.9 in
• Fitting option: 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

Why Choose This Housing Assembly?

The 21000 housing is certified as a CSA Type 4 enclosure and is fully compliant with API 670 for externally mounted proximity probe housings. CSA approvals make it rated explosion proof for hazardous areas, and it supports intrinsically safe applications when ordered with approved probes. The aluminum body with stainless steel sleeve balances weight and corrosion resistance for demanding plant environments.

Applications and Compatibility

Use this assembly with 3300 XL 8 mm probe systems for radial and axial position measurement on compressors, turbines, pumps, and motors. The reverse-mount design allows probe installation from the housing exterior, simplifying maintenance. The 0.5 m cable length suits short runs to junction boxes, while the 3/4-14 NPT thread fits standard conduit connections.

Ordering and Support

Each unit is new and original in factory packing, backed by a 12-month factory warranty. For pricing and availability of This unit and other genuine Bently Nevada spare parts, contact TenBN — your authorized distributor for fast global shipping from China and competitive MRO pricing.