Bently Nevada 330101-00-36-05-02-05 Retrofit-Ready Proximity Probe for 3300 XL Control Systems
The Bently Nevada 330101-00-36-05-02-05 is a 5mm eddy-current proximity probe designed for the 3300 XL Series continuous machinery monitoring platform. As legacy installations age and OEM support windows close, this probe serves as a verified retrofit-ready replacement for discontinued or end-of-life units in rotating machinery protection systems. Whether you are upgrading a turbine monitoring rack, replacing a failed probe in a compressor train, or migrating from an older 3300 Series architecture to the 3300 XL platform, this component delivers the dimensional accuracy, signal linearity, and cable integrity required for uninterrupted vibration and position monitoring.
The 330101-00-36-05-02-05 features a 36-inch (approximately 914 mm) armored extension cable, a standard 5mm sensing tip, and a threaded body compatible with existing probe holders and mounting brackets used across the 3300 XL rack infrastructure. The probe integrates directly with the 3300 XL proximitor/seismic I/O module and is calibrated to work within the standard -24 VDC bias voltage range supplied by the proximitor driver. No firmware changes or rack reconfiguration are required for a direct swap in most installations.
For engineers managing brownfield upgrades, this probe is a critical first step in a broader system modernization effort. Replacement planning should account for the full signal chain: the probe itself, the extension cable assembly, the proximitor driver module (such as the 3300/16 or 3300/20 series), and the I/O termination block within the rack. When migrating from older 3300 Series probes to 3300 XL-compatible hardware, verify that the proximitor driver firmware version supports the new probe’s sensitivity factor (typically 7.87 V/mm for standard gap range). Mismatched sensitivity factors are a common source of false alerts during commissioning.
Upgrade Compatibility Table
| Parameter | Detail |
|---|---|
| SKU / Part Number | 330101-00-36-05-02-05 |
| Brand | Bently Nevada |
| Series | 3300 XL |
| Probe Type | Eddy-Current Proximity Probe, 5mm |
| Cable Length | 36 inches (914 mm) |
| Bias Voltage | -24 VDC (standard 3300 XL proximitor supply) |
| Sensitivity Factor | 7.87 V/mm (standard) |
| Mounting Interface | Threaded body, compatible with 3300 XL probe holders |
| Connector Type | Standard coaxial, mates with 3300 XL extension cable |
| Communication Compatibility | Analog signal output; compatible with 3300 XL I/O modules and System 1 software |
| Replacement Scope | Direct drop-in for discontinued 330101 series probes in 3300 XL racks |
| Commissioning Notes | Verify gap voltage, sensitivity factor, and proximitor driver firmware before energizing |
| Warranty | 12 Months from date of shipment |
Retrofit Planning for Existing Automation Systems
A successful retrofit of the 330101-00-36-05-02-05 into an existing machinery protection system requires a structured approach that goes beyond simply swapping the probe. Begin by auditing the full signal chain within the monitoring rack. The 3300 XL rack typically houses a combination of the 3300/16 or 3300/20 proximitor driver cards, a 3300/55 power supply module, and a 3300/46 or 3300/50 I/O termination block. Each of these components must be confirmed operational before the new probe is installed, as a faulty driver card or degraded termination block will produce erroneous readings even with a new probe in place.
When the existing installation uses older 3300 Series (non-XL) hardware, the migration path typically involves replacing the proximitor driver with an XL-compatible unit, updating the rack backplane connections, and reconfiguring the channel assignments in the System 1 condition monitoring software. During this process, the 3300/65 communication gateway or a 3500/92 communication gateway (for sites that have partially migrated to the 3500 Series platform) may need to be reconfigured to reflect the new channel mapping. Engineers should also verify that the HMI screens in the DCS or SCADA system — whether running on a Rockwell FactoryTalk View, Wonderware InTouch, or GE iFIX platform — correctly reference the updated tag names and engineering unit scaling for the new probe.
For installations where the probe is mounted in a high-temperature or high-vibration environment, inspect the probe holder, lock nut, and armored cable routing before finalizing the replacement. The 330101-00-36-05-02-05’s 36-inch cable is designed to reach the proximitor driver without intermediate splicing, but if the original installation used a longer extension cable assembly (such as a 330130 series extension), confirm that the total cable length remains within the proximitor’s specified range to avoid sensitivity drift. Document the as-found gap voltage (typically between -10 and -18 VDC for a properly gapped probe) before removing the old unit, and use this as a baseline for setting the gap on the new probe during reinstallation.
I/O expansion during the retrofit is also an opportunity to add redundant measurement channels. Many sites use this window to install an additional 3300 XL channel card to provide a backup measurement path, reducing the risk of a single-point failure in critical machinery protection loops. If the control cabinet has available rack slots, this is the time to populate them with spare I/O modules and label them clearly for future maintenance teams.
Downtime Control During System Migration
Minimizing unplanned downtime during a probe replacement or system migration requires preparation that begins well before the maintenance window opens. The most effective approach is to pre-stage all replacement components — including the 330101-00-36-05-02-05 probe, any required extension cable assemblies, the proximitor driver card, and termination hardware — and perform a bench test of the complete signal chain before the machine is taken offline. This allows the maintenance team to confirm that the replacement hardware is functional and that the gap voltage and sensitivity factor are within specification before the clock starts on the outage.
During the outage, follow a structured sequence: isolate the channel in the System 1 software to suppress nuisance alerts, remove the old probe and cable assembly, install the new 330101-00-36-05-02-05, set the gap to the documented as-found value, and restore the channel in the monitoring system. If the machine uses a voted trip logic (such as a 2-out-of-3 configuration), the replacement can often be performed with the machine running by temporarily bypassing the affected channel — but this must be done in strict accordance with the site’s management of change (MOC) procedure and with the approval of the machinery protection engineer.
After reinstallation, perform a full functional test: verify the gap voltage, confirm the vibration signal is within the expected baseline range, check the System 1 trend display for signal continuity, and confirm that the DCS or SCADA alarm setpoints are active and correctly scaled. Document the as-left gap voltage and signal level in the maintenance record. This documentation is essential for future troubleshooting and for demonstrating compliance with API 670 or equivalent machinery protection standards.
All units supplied by SMARTNEXMSK are subject to pre-shipment functional testing and are covered by a 12-month warranty from the date of shipment. In-stock units are available for same-day or next-business-day dispatch to minimize lead time impact on planned maintenance schedules.
Retrofit Support FAQ
Q: Is the 330101-00-36-05-02-05 a direct replacement for older 330101 series probes used in non-XL 3300 Series racks?
A: The 330101-00-36-05-02-05 is designed for the 3300 XL platform. If your existing rack uses older 3300 Series (non-XL) proximitor drivers, you will need to verify driver compatibility or upgrade the driver card to a 3300 XL-compatible unit. Contact our technical team with your rack configuration details for a compatibility assessment before ordering.
Q: What gap voltage should I set when installing the new probe, and how do I verify it?
A: The standard gap voltage for a 5mm probe on the 3300 XL platform is typically between -10 and -18 VDC, with the optimal gap usually around -12 VDC. Use a calibrated digital multimeter to measure the DC voltage at the proximitor output terminals with the machine stationary. Adjust the probe gap (by threading the probe in or out of the holder) until the voltage is within the specified range, then lock the probe in place with the lock nut and record the as-left value.
Q: Can the probe be installed while the machine is running?
A: Hot-swap installation is possible in systems with voted trip logic (e.g., 2-out-of-3), provided the affected channel is properly bypassed in the monitoring system and the work is performed under an approved MOC procedure. For single-channel installations, the machine must be shut down before the probe is replaced. Always consult your site’s machinery protection engineer and follow local safety procedures.
Q: What does the 12-month warranty cover, and what is the process for a warranty claim?
A: The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions from the date of shipment. It does not cover damage resulting from improper installation, incorrect gap setting, electrical overstress, or physical impact. To initiate a warranty claim, contact sales@smartnexmsk.com with your order number, a description of the failure, and the as-found gap voltage and signal readings. Our team will arrange for a replacement or repair within the warranty period.
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