Bently Nevada 21022 Modules

Technical Dossier

Product Details And Specifications

Bently Nevada 21022 Series: Comprehensive Module Range and Technical Overview

The Bently Nevada 21022 series Dual Axial Probe Housing Assembly is a precision-engineered component within Bently Nevada's 3300 and 7200 series vibration monitoring ecosystems. Deployed across global heavy industry — including petrochemical refineries, nuclear power stations, offshore platforms, and rotating machinery installations — the 21022 housing assembly provides the mechanical interface between eddy-current proximity probes and the monitored shaft or target surface. Its axial orientation makes it the standard solution for thrust position measurement on turbines, compressors, and pumps where axial displacement is a critical safety parameter. The 21022 series is fully compatible with Bently Nevada's 3300 XL 8mm and 3300 5mm probe systems, and integrates directly with 3500 series rack-based monitoring systems. Installed base spans decades of continuous operation in facilities governed by API 670 machinery protection standards.

The Evolution of 21022 Architecture

The 21022 housing assembly line was developed as part of Bently Nevada's systematic standardization of proximity probe field hardware during the late 1980s and 1990s. Early variants were designed for direct integration with the 3300 series monitors, which used analog signal conditioning and required precise probe gap calibration within a defined linear range. As the industry transitioned to the 3500 series digital rack platform in the mid-1990s, the 21022 mechanical form factor was retained, ensuring backward compatibility with existing conduit and mounting infrastructure — a deliberate design decision that reduced retrofit costs for end users.

The part numbering convention encodes critical configuration data: probe tip diameter (5mm or 8mm), cable length, connector type, and housing material (standard or high-temperature alloy). Later revisions introduced improved thread-locking mechanisms and corrosion-resistant coatings for offshore and high-humidity environments. As of 2026, the 21022 series is in the mature/end-of-life phase of its product lifecycle. Bently Nevada (now a Baker Hughes company) has transitioned new installations toward the 3500/42M and 3500/45 position monitor modules paired with current-generation probe assemblies. However, the installed base of 21022-compatible systems remains extensive, and long-term maintenance support for these assemblies is a primary operational requirement for asset-intensive industries.

21022 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced configurations within the Bently Nevada 21022 Dual Axial Probe Housing Assembly series. Each entry reflects a distinct mechanical or electrical configuration:

21022-28-05-017-03: Dual axial probe housing, 8mm tip, 5m cable, standard connector, carbon steel body
21022-28-05-010-03: Dual axial housing, 8mm tip, 1m cable, standard connector, field-trim configuration
21022-28-05-025-03: Dual axial housing, 8mm tip, 2.5m cable, standard connector, mid-range cable run
21022-28-05-050-03: Dual axial housing, 8mm tip, 5m cable, armored cable variant, high-vibration zones
21022-28-08-017-03: Dual axial housing, 8mm tip, 8m cable, standard connector, extended conduit runs
21022-28-10-017-03: Dual axial housing, 8mm tip, 10m cable, standard connector, remote monitor cabinets
21022-28-05-017-02: Dual axial housing, 8mm tip, 5m cable, alternate connector type, legacy rack interface
21022-28-05-017-01: Dual axial housing, 8mm tip, 5m cable, MIL-spec connector, defense/nuclear applications
21022-05-05-017-03: Dual axial housing, 5mm tip, 5m cable, standard connector, compact machinery
21022-05-05-010-03: Dual axial housing, 5mm tip, 1m cable, standard connector, short-run installations
21022-05-05-025-03: Dual axial housing, 5mm tip, 2.5m cable, standard connector, mid-range configuration
21022-05-08-017-03: Dual axial housing, 5mm tip, 8m cable, standard connector, extended field wiring
21022-05-10-017-03: Dual axial housing, 5mm tip, 10m cable, standard connector, long-distance signal runs
21022-28-05-017-HT: Dual axial housing, 8mm tip, 5m cable, high-temperature alloy body, furnace/kiln proximity
21022-28-05-017-SS: Dual axial housing, 8mm tip, 5m cable, stainless steel body, corrosive/offshore environments
21022-28-05-017-EX: Dual axial housing, 8mm tip, 5m cable, ATEX/IECEx certified, Zone 1 hazardous areas
21022-28-05-017-03-R: Factory-reconditioned dual axial housing, 8mm tip, 5m cable, tested to OEM specification

Sourcing Hard-to-Find & Obsolete 21022 Parts

The 21022 series has entered end-of-life status within Bently Nevada's current product portfolio. OEM lead times for remaining new-old-stock (NOS) units are unpredictable, and many configurations are no longer manufactured. DriveKNMS maintains a dedicated inventory of 21022 assemblies sourced through authorized surplus channels, decommissioned plant asset recovery, and verified third-party overhaul programs. For facilities operating 3300 or early 3500 series monitoring racks, the 21022 housing assembly is a non-substitutable component — no direct modern equivalent exists without mechanical modification to the probe mounting boss. DriveKNMS provides lifecycle extension support including cross-reference matching (by cable length, connector type, and probe diameter), configuration verification against plant P&ID documentation, and emergency same-day dispatch for critical shutdown avoidance scenarios. Customers in the petrochemical, LNG, and nuclear sectors are encouraged to establish a standing spare parts agreement to mitigate unplanned downtime risk.

Quality Control for the 21022 Range

Each 21022 assembly processed by DriveKNMS undergoes a structured inspection and functional verification protocol before dispatch. Mechanical inspection covers housing thread integrity, probe tip concentricity, cable jacket condition, and connector pin continuity. Electrical verification includes gap voltage output measurement across the full linear range (typically -2 VDC to -18 VDC for 8mm probes with a -24 VDC driver), sensitivity confirmation at 7.87 V/mm (200 mV/mil), and insulation resistance testing at 500 VDC. For assemblies with armored cable, bend radius and shield continuity are verified. Units exhibiting gap voltage drift, non-linear output, or connector corrosion are quarantined and not dispatched. All tested units are issued a DriveKNMS inspection certificate with recorded test values, traceable to the specific serial number or batch reference. This protocol is specifically designed for the 21022's dual-probe configuration, where both probe channels must be verified independently before the assembly is cleared for installation in a live machinery protection system.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.