Bently Nevada 31000-28-05-00-024-01-02 3300 XL Probe

Product Overview

Bently Nevada 31000-28-05-00-024-01-02 3300 XL Replacement Probe: Seamless Transition from Legacy Vibration Monitoring Systems

The Bently Nevada 31000-28-05-00-024-01-02 is a 28mm proximity probe with a 5-meter extension cable, engineered for the 3300 XL Series continuous vibration monitoring platform. This component is a direct replacement and upgrade solution for facilities operating aging or discontinued Bently Nevada 3300 Series proximity measurement systems, including earlier 7200 Series and 3300/5 Series installations where the original probes have reached end-of-life or are no longer available through standard OEM channels.

At TOPNLMS, we maintain verified stock of the 31000-28-05-00-024-01-02 to support planned maintenance shutdowns, emergency replacements, and long-term spare parts programs for rotating machinery protection systems in power generation, petrochemical, oil and gas, and heavy industrial environments.

Compatibility Comparison Table

Seamless Upgrade Solutions

Replacing the 31000-28-05-00-024-01-02 probe is rarely an isolated task. In most retrofit and upgrade scenarios, the probe is one component within a broader 3300 XL measurement chain. The extension cable — typically a Bently Nevada 330130-045-00-CN or equivalent 5-meter armored cable — must be inspected and replaced if the outer jacket shows cracking or the connector shows corrosion, as a degraded cable will introduce noise into the gap voltage signal even with a new probe installed.

The proximitor sensor, such as the Bently Nevada 330180-X1-05 or 3300 XL 8mm proximitor, converts the probe’s eddy-current signal into the -24 VDC analog output read by the monitor. If the existing proximitor has been in service for more than five years in a high-temperature environment, replacing it alongside the probe eliminates the risk of a second unplanned outage within the same maintenance window.

On the monitor side, facilities running the Bently Nevada 3500/42M Proximitor/Seismic Monitor or the older 3300/16 Dual Vibration Monitor will find that the 31000-28-05-00-024-01-02 integrates without any channel reconfiguration. The monitor’s gap voltage setpoints, alert thresholds, and danger thresholds remain valid after probe replacement, provided the new probe is gapped correctly to the manufacturer’s recommended 1.0 mm (40 mil) nominal gap — confirmed by a DC gap voltage reading of approximately -10.4 VDC on a standard steel target.

For facilities undertaking a broader migration from a 3300/5 Series rack to a 3500 Series rack, the replacement of proximity probes is the first step. The 3500 rack accepts the same 3300 XL probe-and-cable assemblies, and the 3500/42 monitor card is backward-compatible with the analog signal chain. This means the field wiring, conduit runs, and probe brackets can be retained while the rack, power supply module — such as the 3500/15 Power Supply — and I/O modules are upgraded. The 3500/20 Rack Interface Module handles communication to the plant DCS or safety system via Modbus or Ethernet/IP, replacing the older serial interfaces used in 3300 Series racks.

In turbomachinery protection applications, the proximity probe system works in conjunction with a Keyphasor module — typically the Bently Nevada 3500/25 Enhanced Keyphasor Module — which provides the once-per-revolution reference signal for phase and speed measurements. When replacing probes on a multi-channel machine train, it is good practice to verify the Keyphasor probe gap and cable continuity at the same time to ensure that dynamic data quality is maintained across all channels after the maintenance event.

For sites where the control cabinet space is constrained, the compact form factor of the 3300 XL probe assembly is an advantage. The 28mm probe body fits standard probe holders without modification, and the 5-meter cable length covers the majority of turbine, compressor, and pump bearing housing installations without requiring a junction box or cable extension splice. Where longer runs are needed, a Bently Nevada 330130-080-00-CN 8-meter cable assembly is the recommended alternative to maintain signal integrity within the proximitor’s specified cable length range.

Retrofit Guidance FAQ

Q: Can I replace a 3300/5 Series probe with the 31000-28-05-00-024-01-02 without rewiring?
A: Yes. The 3300 XL probe uses the same coaxial connector and signal convention as the 3300/5 Series. The field cable and junction box wiring do not need to be changed. Only the probe body and, if necessary, the extension cable need to be replaced.

Q: Do I need to recalibrate the monitor after replacing the probe?
A: No full recalibration is required. After installation, verify the DC gap voltage at the monitor input to confirm the probe is gapped correctly. Adjust the probe position if the gap voltage falls outside the -9.5 to -11.5 VDC range. Alert and danger setpoints do not need to be changed.

Q: Is the 31000-28-05-00-024-01-02 compatible with the 3500/42 monitor?
A: Yes. The 3500/42 Proximitor/Seismic Monitor accepts the full 3300 XL probe-and-cable assembly. No channel configuration changes are required in the 3500 rack software when replacing a like-for-like probe.

Q: What is the correct installation gap for this probe on a steel shaft?
A: The recommended nominal gap is 1.0 mm (40 mil), corresponding to approximately -10.4 VDC gap voltage. The linear measurement range is 0.25 to 2.54 mm (10 to 100 mil). Always verify with a calibrated DC voltmeter at the monitor input terminal before returning the machine to service.

Q: Can this probe be used in high-temperature environments?
A: The 3300 XL probe is rated for ambient temperatures up to 177°C (350°F) at the probe tip. For applications exceeding this range, consult the Bently Nevada high-temperature probe options. The extension cable and proximitor must also be rated for the installation environment.

Q: What communication protocol does this system use?
A: The proximity probe and proximitor output an analog DC voltage signal. There is no digital protocol at the probe level. The 3500 rack monitor communicates to the plant DCS or historian via Modbus RTU, Modbus TCP, or Ethernet/IP depending on the rack interface module installed.

Q: How do I confirm the probe is functioning correctly after installation?
A: Perform a static gap check using a DC voltmeter. Then perform a dynamic check by observing the vibration signal on the monitor during machine startup. Compare the 1X and 2X vibration amplitude and phase readings against the baseline data from the previous probe to confirm the replacement is performing correctly.

Warranty Assurance

Every Bently Nevada 31000-28-05-00-024-01-02 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to shipment, each unit undergoes functional verification including visual inspection, connector integrity check, and coil resistance measurement to confirm the probe is within specification.

If a unit is found to be defective on arrival or fails within the warranty period under normal operating conditions, TOPNLMS will arrange a replacement shipment or issue a refund based on the customer’s preference. Our after-sales response time is within 24 hours on business days. Replacement units are dispatched from our Xiamen warehouse, with DHL Express, FedEx International Priority, and sea freight options available depending on urgency and destination.

For procurement teams managing spare parts programs, we can provide batch inspection reports, packing lists, and commercial invoices suitable for customs clearance. We support T/T bank transfer, PayPal, and trade assurance payment terms. Minimum order quantity is one unit, and volume pricing is available for orders of five units or more.

Contact our technical sales team before placing your order if you need to confirm compatibility with a specific machine train, monitor firmware version, or installation configuration. We maintain application records for common turbomachinery platforms and can advise on the correct probe, cable, and proximitor combination for your system.