Bently Nevada 21022-28-05-017-03 Replacement for 21022 Series

Product Overview

Bently Nevada 21022-28-05-017-03 Replacement for 21022 Series: Seamless Transition & Legacy System Compatibility

The Bently Nevada 21022-28-05-017-03 is a dual axial proximity probe housing assembly designed for continuous shaft vibration and position monitoring in rotating machinery protection systems. As legacy 21022 Series installations approach end-of-service life or face discontinued spare parts availability, plant engineers and reliability teams are increasingly seeking a verified, drop-in replacement that preserves existing wiring infrastructure, conduit routing, and Bently Nevada 3300 Series monitor compatibility without requiring a full system overhaul.

This replacement unit is sourced, inspected, and dispatched from our Xiamen warehouse. It is fully compatible with the Bently Nevada 3300 XL monitor series and integrates directly into existing Proximitor/Seismic Monitor racks without modification to the signal conditioning chain. Whether your facility is running a 3300/16 or 3300/55 monitor card, the 21022-28-05-017-03 maintains the same -24 VDC bias voltage requirement, 200 mV/mil sensitivity output, and standard 5-metre or 9-metre extension cable pairing — meaning your existing Bently Nevada 330130 or 330180 extension cables remain fully serviceable.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from a worn or discontinued 21022 Series probe assembly rarely involves a single component swap. In practice, field engineers conducting a planned shutdown replacement will simultaneously audit the full signal chain. The Bently Nevada 330130-090-00-05 extension cable is the most common companion item — its 9-metre length suits the majority of turbine pedestal-to-rack runs and connects directly to the 21022-28-05-017-03 without adapters. Where cable runs exceed standard lengths, the 330180 Series armoured extension cable provides additional mechanical protection in high-vibration or high-temperature environments.

At the monitor end, facilities running the Bently Nevada 3300/16 Dual Voting Logic monitor or the 3300 XL 8mm Proximity Transducer System will find that the replacement probe integrates without recalibration of the monitor’s gap voltage setpoints, provided the target material and air gap are set correctly during reinstallation. For sites that have already migrated their protection logic to the System 1 Evolution platform, the probe output feeds identically into the 3500/42M Proximitor Monitor module, making this replacement equally valid in both legacy and modernised rack architectures.

Control cabinet space is rarely a constraint with this replacement, as the 21022-28-05-017-03 housing dimensions are unchanged from the original specification. However, if the surrounding conduit fittings or junction boxes have degraded, pairing the probe replacement with a Bently Nevada 02807264 field junction box or equivalent IP65-rated enclosure is advisable to maintain signal integrity. For facilities also upgrading their I/O infrastructure, the 3500/20 Rack Interface Module and 3500/92 Communication Gateway Module are commonly ordered alongside proximity probe replacements to bring the entire vibration monitoring node up to current firmware and communication standards — particularly where Modbus RTU or FOUNDATION Fieldbus integration with a DCS is required.

Sites decommissioning older Keyphasor assemblies as part of the same outage window often source the Bently Nevada 330980 Keyphasor Module simultaneously, as the phase reference signal is critical to balancing and runout compensation routines in the 3300 and 3500 monitor families. Ordering these components together from a single verified supplier reduces lead time risk and simplifies incoming inspection.

Retrofit Guidance FAQ

Q: Will the existing field wiring need to be re-terminated?
No. The 21022-28-05-017-03 uses the same coaxial connector standard as the outgoing unit. Provided the extension cable is undamaged and within its service life, the field wiring can be reconnected without re-termination. Inspect the cable jacket and connector body for corrosion or mechanical damage before reuse.

Q: Do I need to re-enter gap voltage setpoints in the monitor?
Only if the target material or air gap distance has changed. If the replacement probe is installed at the same gap as the original (typically 50 mil / 1.27 mm for steel targets), the monitor’s existing gap voltage alarm setpoints remain valid. Verify with a calibrated gap tool during commissioning.

Q: Is this compatible with Modbus RTU or FOUNDATION Fieldbus communication?
The probe itself is a passive transducer — communication protocol compatibility is determined by the monitor module (e.g., 3500/92 Communication Gateway). The 21022-28-05-017-03 is protocol-agnostic and compatible with any monitor that accepts a standard -24 VDC proximity transducer input.

Q: What is the physical installation clearance requirement?
The probe housing dimensions are identical to the original 21022 Series specification. No modification to the probe boss, bracket, or conduit entry is required. Confirm thread engagement depth and torque to the manufacturer’s specification (typically 1.5 Nm for the probe tip lock nut).

Q: Can this unit replace probes in a redundant (dual-voting) configuration?
Yes. The 21022-28-05-017-03 is suitable for use in dual-channel or dual-voting monitor configurations such as the 3300/16. Both channels should be replaced simultaneously during a planned outage to ensure matched sensitivity and bias characteristics across the voting pair.

Warranty Assurance

Every 21022-28-05-017-03 unit dispatched by TOPNLMS is covered by a 12-Month Warranty from the date of shipment. Prior to dispatch, each unit undergoes a pre-shipment functional check including bias voltage verification, sensitivity output measurement, and visual inspection of the connector body, cable entry seal, and probe tip. Units that do not meet specification are quarantined and not shipped.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund within the warranty period. Our after-sales response target is 24 hours for initial acknowledgement and 72 hours for resolution proposal. Replacement units are dispatched from Xiamen with express freight to minimise plant downtime exposure.

For procurement teams requiring documentation, we can provide a Certificate of Conformance, packing list, and commercial invoice with HS code declaration for customs clearance. Bulk orders for MRO stocking programmes are supported with volume pricing and scheduled delivery agreements.

Stock is maintained on-hand in Xiamen. Standard lead time for in-stock units is 3–5 business days to most destinations. Express DHL/FedEx options are available for urgent shutdown requirements.