This update presents Bently Nevada 21000 Series proximity probe housing assemblies for externally mounted proximity probes. The 21000 design uses an aluminum body with a 304 stainless steel sleeve and combines a screw-on dome cover, conduit ports, O-rings, thread sealing, a reverse-mount probe and optional fittings or standoff hardware. It is relevant when an engineering or maintenance team needs a defined mechanical housing around the probe installation rather than an unprotected external mount.
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Where
External probe mounting points on rotating machinery and associated machine cases.
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Who
Reliability, instrumentation, maintenance and spare-parts teams.
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How
Match the complete six-option ordering code to the probe and mounting requirements.
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The housing is not a single universal part number. Its ordering structure defines the probe type, probe cable length, standoff-adapter dimension, probe penetration, conduit fittings and mounting thread. Available probe choices include 3300 XL 8 mm, 3300 XL NSv and 3300 XL 11 mm variants, including selected approval and connector-protector options. This modular code matters because two housings that look similar can represent different mechanical or probe arrangements.
Teams can consider the 21000 assembly during planned maintenance, an instrumentation replacement or a spare-parts review for an existing external probe installation. The official product data describes CSA Type 4 enclosure compliance and API 670 compliance for externally mounted proximity-probe housings, while approval details depend on the ordered housing and option combination. For new installations that do not require an explosion-proof housing, Bently Nevada identifies the newer 31000/32000 housing family as the preferred alternative because it offers more flexible mounting and improved environmental resistance.
Confirm the complete nameplate or order code before purchasing. Check the probe family and approval selection, cable length, standoff length, penetration dimension, fitting package and mounting thread. The probe lead must be longer than the sleeve. When the combined standoff and penetration length exceeds 12 inches, the official instructions require sleeve support near the probe to prevent resonance. Short penetration arrangements may also require a machine-case counterbore to reduce side-view or rear-view effects, so the mounting drawing should be reviewed before installation.
Before ordering, confirm the complete model, approval selection, cable length, dimensions, fittings, mounting thread, quantity and label information. Linked models below have verified StockOEMs product pages; other entries are official ordering-code configurations and are shown as plain text.
| Model | Hardware Role / Description |
|---|---|
| CA21000-34-05-00-040-03-02 | Aluminum housing with 3300 XL 8 mm probe, connector protector and approval option |
| CA21000-32-05-00-038-03-02 | Aluminum housing with 3300 XL NSv probe, connector protector and approval option |
| CA21000-34-05-00-036-03-02 | Aluminum housing with protected 3300 XL 8 mm probe and 0.5 m cable |
| CA21000-34-05-00-022-03-02 | Aluminum housing with protected 3300 XL 8 mm probe and 2.2 in penetration code |
| 21000-16-10-00-167-04-02 | Aluminum housing with 3300 XL 8 mm probe and 1.0 m cable |
| 21000-16-10-00-126-04-02 | Aluminum housing with 3300 XL 8 mm probe, 1.0 m cable and plug-only fitting option |
| 21000-16-10-00-054-04-02 | Aluminum housing with 3300 XL 8 mm probe and 5.4 in penetration code |
| 21000-26-05-00-037-00-01 | Aluminum housing configuration with 3300 XL NSv probe and 0.5 m cable |
| 21000-27-10-00-037-01-02 | 3300 XL NSv probe configuration with selectable hazardous-area approvals |
| 21000-28-05-00-037-02-02 | 3300 XL 8 mm probe configuration with selectable hazardous-area approvals |
| 21000-29-10-00-037-04-04 | Aluminum housing configuration with 3300 XL 11 mm probe |
| 21000-31-05-00-037-00-01 | 3300 XL NSv probe configuration with connector protector |
| 21000-33-10-00-037-01-02 | 3300 XL 8 mm probe configuration with connector protector |
| 21000-35-10-00-037-02-02 | 3300 XL 11 mm probe configuration with connector protector |
| 21000-37-10-00-037-04-02 | 3300 XL 8 mm ETR probe configuration with selectable hazardous-area approvals |
