Bently Nevada 330104-05-11-50-02-CN 3300 XL Proximity Transducer

Bently Nevada 330104-05-11-50-02-CN: Retrofit-Ready Proximity Transducer for 3300 XL Control Systems

The Bently Nevada 330104-05-11-50-02-CN is an eddy-current proximity transducer engineered for the 3300 XL Series continuous machinery monitoring platform. Designed as a direct retrofit replacement for legacy 3300 Series and earlier 7200 Series transducer assemblies, this module delivers drop-in mechanical and electrical compatibility with existing monitor racks, field wiring, and Keyphasor® reference circuits — enabling smooth system upgrades with minimal downtime and no reprogramming of the host monitor.

Whether you are replacing a failed transducer on a critical rotating machine, modernizing an aging vibration monitoring loop, or migrating from a discontinued 3300/05 or 3300/16 monitor card to a current-generation 3300 XL rack, the 330104-05-11-50-02-CN provides the sensitivity, gap range, and cable length specification required for most turbine, compressor, and pump shaft-proximity applications. The -CN suffix designates the connector style and cable termination standard used in this configuration, which must be verified against the existing junction box or proximitor housing before installation.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit of the 330104-05-11-50-02-CN into an operating plant begins well before the maintenance window opens. The first step is a full loop audit: trace the existing transducer cable from the machine casing through the conduit run to the proximitor — typically a 3300 XL Proximitor/Velomitor® module mounted in the field junction box — and then back to the 3300 XL Monitor card seated in the rack. Document the DC gap voltage (normally between −10 VDC and −18 VDC for a healthy gap), the OK relay state, and the current vibration amplitude reading so you have a baseline for post-installation comparison.

Check the extension cable. The 330104-05-11-50-02-CN ships with a 5.0 m integral cable; if the total probe-to-proximitor distance exceeds 5.0 m, you will need a compatible 3300 XL Extension Cable to bridge the gap. Confirm that the extension cable connector matches the -CN termination on this transducer before ordering. Mismatched connectors are one of the most common causes of installation delays during retrofits.

At the rack level, verify that the 3300 XL Monitor card — for example a 3300/20 Dual Voting or 3300/25 Keyphasor® monitor — is configured for the correct transducer sensitivity (200 mV/mil). If the existing configuration file was written for a 100 mV/mil transducer, the full-scale and alarm setpoints will need to be recalculated before the machine is returned to service. This configuration is held in the monitor’s non-volatile memory and can be read and written using the System 1 Evolution software or the legacy Data Manager software, depending on the vintage of your monitoring system.

For plants running a 3500 Series Machinery Protection System alongside legacy 3300 XL hardware, the 330104-05-11-50-02-CN can also interface with 3500/42 Proximitor/Seismic Monitor modules using the appropriate adapter plate and wiring harness. In mixed-generation racks, pay close attention to the power supply loading: the 3500 Rack Power Supply and the 3300 XL Power Supply have different current budgets, and adding transducer loops without recalculating the total load can trip the power supply’s overcurrent protection during startup.

I/O mapping is straightforward for this transducer type — the proximity signal feeds directly into the monitor’s BNC or terminal-block input, and the OK relay output wires to the plant DCS or safety PLC through the existing I/O terminal strip. If the plant DCS is a Honeywell Experion or an Emerson DeltaV, the 4–20 mA retransmission output from the 3300 XL Monitor can be mapped to the existing analog input channel without any changes to the DCS configuration. HMI faceplate updates are typically limited to relabeling the tag description if the new transducer is assigned a different instrument tag number during the retrofit.

Before closing the junction box, perform a complete pre-commissioning check: measure the DC gap voltage with the shaft stationary, confirm the OK relay is energized, apply a known vibration source (or use the built-in test function on the 3300 XL Monitor) to verify the AC vibration signal path, and document the as-left gap voltage for the maintenance record. All units supplied by SMARTNEXMSK are bench-tested prior to shipment and include a 12-month warranty covering manufacturing defects and functional failure under normal operating conditions.

Downtime Control During System Migration

Minimizing unplanned downtime during a proximity transducer replacement requires a structured hot-swap protocol. Where the process permits a brief controlled shutdown, the preferred approach is to place the 3300 XL Monitor channel into bypass mode before disconnecting the old transducer. Bypass mode holds the last valid OK relay state and suppresses spurious alarms to the DCS and safety system during the swap interval, protecting the plant’s alarm management records and preventing nuisance trips to the Emergency Shutdown System (ESD).

If the machine cannot be taken offline, a live replacement is possible on some 3300 XL configurations where the monitor supports channel-level bypass without a full rack power cycle. Consult the 3300 XL Monitor manual (GEH-6721 or equivalent) for the specific bypass procedure applicable to your monitor card revision. During a live replacement, keep the replacement transducer and extension cable pre-assembled and gap-set on a bench fixture before approaching the machine, so the actual time the channel is in bypass is limited to the physical swap and reconnection — typically under five minutes for an experienced technician.

After reconnection, restore the channel from bypass and confirm the DC gap voltage returns to the expected range within 30 seconds. If the OK relay does not energize, the most common causes are an incorrect gap distance, a damaged cable connector, or a sensitivity mismatch between the transducer and the monitor configuration. Do not return the machine to full load until the gap voltage and vibration baseline have been verified against the pre-retrofit documentation. Preserving the original program logic in the DCS and safety PLC — including the vibration high-high trip setpoints and the OK relay interlock — is essential to maintaining SIL compliance and avoiding unintended changes to the machine protection philosophy.

Retrofit Support FAQ

Q1: Is the 330104-05-11-50-02-CN a direct drop-in replacement for the 330104-05-11-50-02 (without the -CN suffix)?
The core transducer performance (sensitivity, gap range, frequency response) is identical. The -CN suffix designates the connector and cable termination style. Before substituting, verify that the connector on the replacement matches the mating connector on your extension cable or junction box. If the connectors differ, a field-wirable adapter or a replacement extension cable with the correct termination will be required.

Q2: What gap voltage should I set after installation, and how do I verify it?
For most 3300 XL applications with a steel target, the recommended DC gap voltage is between −12 VDC and −14 VDC, corresponding to a physical gap of approximately 1.5 mm to 1.8 mm. Use a calibrated digital voltmeter at the proximitor output terminals to measure the gap voltage with the shaft stationary. Refer to the transducer calibration curve in the 330104 Series datasheet for the exact gap-voltage relationship for your target material.

Q3: Will I need to modify the 3300 XL Monitor configuration after replacing the transducer?
If the replacement transducer has the same sensitivity (200 mV/mil) as the original, no monitor reconfiguration is required. If the sensitivity differs, the full-scale range, alarm setpoints, and danger setpoints stored in the monitor must be recalculated and updated using System 1 Evolution or Data Manager software before the machine is returned to service.

Q4: What does the 12-month warranty cover, and what is the return process?
The 12-month warranty covers manufacturing defects and functional failure under normal operating conditions from the date of shipment. It does not cover damage caused by incorrect installation, overvoltage, mechanical impact, or operation outside the specified environmental limits. To initiate a warranty claim, contact SMARTNEXMSK at sales@smartnexmsk.com with the order number, a description of the failure, and photographic evidence of the installation. Replacement units are dispatched from stock upon confirmation of the warranty claim.

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