Bently Nevada 24701-28-05-00-026-04-02 Replacement for 3300 XL

Product Overview

Bently Nevada 24701-28-05-00-026-04-02 Replacement for 3300 XL: Seamless Transition from Legacy Vibration Monitoring Systems

The Bently Nevada 24701-28-05-00-026-04-02 is an 8mm proximity probe engineered for the 3300 XL Series eddy-current displacement measurement system. As legacy Bently Nevada 3300 Series installations reach end-of-life or face discontinued spare-part availability, plant engineers and reliability teams are increasingly required to migrate to the 3300 XL platform — or to source verified replacement probes that maintain full backward compatibility with existing field wiring, extension cables, and Proximitor® sensor assemblies already installed in the control cabinet.

At TOPNLMS, we stock the 24701-28-05-00-026-04-02 as a direct drop-in replacement, pre-tested and ready to ship from Xiamen. Whether you are executing a planned turnaround, responding to an unplanned trip event, or building a critical-spare inventory program, this probe is available with a 12-month warranty and full documentation support.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from a legacy vibration monitoring installation to the 3300 XL platform rarely involves a single component. In practice, field engineers replacing a worn or discontinued proximity probe will simultaneously audit the matched extension cable — typically a Bently Nevada 330130 or 330131 series extension cable — to confirm that the combined probe-plus-extension system length matches the Proximitor® calibration curve. If the existing extension cable is damaged or its connector is corroded, it must be replaced alongside the probe to maintain the calibrated gap voltage.

The Proximitor® sensor itself — commonly a 330180-51-00 or 330181-51-00 unit mounted inside the junction box or marshalling cabinet — converts the probe’s eddy-current signal into a buffered voltage output readable by the 3300 XL monitor module. When upgrading from an older 3300/05 Proximitor to the XL variant, technicians should verify that the barrier terminal block wiring and the IS (intrinsically safe) barrier modules, such as a MTL or P+F Zener barrier, remain within the approved entity parameters for the new Proximitor’s input impedance.

On the monitor side, the 3300 XL rack accepts standard 3300 XL monitor cards — for example, the 3300/20 radial vibration monitor or the 3300/25 thrust position monitor — which slot into the existing 3300 series rack backplane without requiring a new rack enclosure. This is a significant advantage for brownfield retrofits where control cabinet space is constrained and replacing the full rack would require re-routing cable trays. The 24701-28-05-00-026-04-02 probe is fully compatible with both the radial vibration and axial position measurement channels on these monitor cards.

For installations where the machine train also includes a Keyphasor® transducer — such as a 330980 Keyphasor probe — the phase reference signal wiring can be retained without modification, since the 3300 XL system uses the same Keyphasor input architecture as the legacy 3300 platform. Similarly, if the plant’s DCS or safety system receives 4–20 mA retransmission outputs from the 3300 XL monitor, the existing analog I/O wiring to the DCS marshalling cabinet remains unchanged.

Plants operating Bently Nevada 3500 Series machinery protection systems alongside legacy 3300 XL installations can use the 24701-28-05-00-026-04-02 probe with a 3500/42M position monitor or a 3500/40M proximitor I/O module, provided the appropriate transducer interface module (TIM) is installed. This makes the probe a versatile spare that bridges both platform generations, reducing the number of unique SKUs required in a critical-spare inventory program.

Retrofit Guidance FAQ

Q: Can I reuse the existing field wiring when replacing the probe?
A: Yes. The 24701-28-05-00-026-04-02 uses the same BNC connector and the same analog voltage output as the legacy 3300 Series probe. The field cable from the probe to the junction box does not need to be replaced, provided the cable is undamaged and the connector is clean and properly torqued.

Q: Do I need to re-range or recalibrate the Proximitor® after installing the new probe?
A: Not if the replacement probe is the same model and the extension cable length is unchanged. The 3300 XL system is factory-calibrated as a matched probe-extension-Proximitor set. If you change any element of the set, a gap calibration check at the recommended air-gap voltage (typically −10 VDC ± 0.5 VDC) is recommended before returning the machine to service.

Q: Is the M10 × 1.0 mounting thread compatible with my existing probe holder?
A: Yes. The 24701-28-05-00-026-04-02 uses the standard M10 × 1.0 thread, which is identical to all 8mm probes in the Bently Nevada 3300 and 3300 XL families. No machining or adapter is required.

Q: What communication protocol does this probe use?
A: The probe outputs an analog DC voltage proportional to the gap distance. There is no digital fieldbus protocol at the probe level. The Proximitor® sensor converts this signal to a buffered voltage that is read by the monitor card over the rack backplane. If your plant uses Modbus RTU or FOUNDATION Fieldbus for DCS integration, that interface is handled at the monitor card or gateway level, not at the probe.

Q: Can this probe be used in a hazardous area (Zone 1 / Division 1)?
A: The probe itself is passive and intrinsically safe when used with an approved IS barrier and a certified Proximitor® sensor. Confirm the entity parameters (Vmax, Imax, Ci, Li) of the probe against your barrier’s documentation before installation in a classified area.

Q: How do I minimize downtime during the swap?
A: Pre-stage the replacement probe, extension cable, and any required tools before the machine is taken offline. Verify the new probe’s gap voltage on the bench before installation. Use a calibrated gap-setting tool to achieve the correct air gap at the probe tip. This reduces in-situ commissioning time to under 30 minutes for an experienced technician.

Warranty Assurance

Every Bently Nevada 24701-28-05-00-026-04-02 proximity probe shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to shipment, each unit undergoes functional verification including gap voltage output check, cable continuity test, and connector inspection. Units that do not meet specification are quarantined and not shipped.

If a warranty claim arises within the 12-month coverage period, TOPNLMS will provide a replacement unit or a full refund, subject to inspection of the returned item. Our after-sales response target is 24 hours for initial acknowledgment and 72 hours for resolution proposal. We maintain buffer stock of this SKU to support rapid exchange without extended lead times.

For procurement teams requiring documentation, we can provide a test report, packing list, and commercial invoice with HS code 9031.80 for customs clearance. Shipment is from Xiamen, China, via DHL Express or FedEx International Priority, with typical transit times of 3–5 business days to most destinations.

To place an order, request a quotation, or confirm stock availability, contact our technical sales team directly.