Bently Nevada 330106-05-30-20-02-CN Retrofit-Ready Proximity Probe for 3300 XL Control Systems
The Bently Nevada 330106-05-30-20-02-CN is a 3300 XL Series eddy current proximity probe engineered for direct retrofit into legacy vibration monitoring and machinery protection systems. As original Bently Nevada 3300 XL components approach end-of-life or become increasingly difficult to source, this probe provides a verified drop-in replacement path that preserves existing wiring, signal conditioning infrastructure, and monitor calibration — minimising both engineering rework and unplanned downtime.
This probe operates on the standard Bently Nevada eddy current sensing principle, delivering a linear output voltage proportional to the gap between the probe tip and the observed rotating shaft. It is designed for continuous use in high-temperature, high-vibration industrial environments including steam turbines, gas compressors, centrifugal pumps, and large induction motors where shaft displacement, radial vibration, and axial position monitoring are critical to safe operation.
Upgrade Compatibility Table
| Parameter | Detail |
|---|---|
| SKU / Part Number | 330106-05-30-20-02-CN |
| Series | Bently Nevada 3300 XL |
| Probe Type | Eddy Current Proximity Probe |
| Cable Length | 5 m (integral) |
| Target Gap Range | 0.25 mm – 2.54 mm (standard) |
| Thread / Mounting | M10 × 1 (standard 3300 XL mount) |
| Signal Output | –24 VDC nominal, linear mV/mil |
| Compatible Driver / Conditioner | 3300 XL 8mm Extension Cable + 3300 XL Proximitor Sensor |
| Compatible Monitors | 3300/16, 3300/20, 3500/40M, 3500/42M |
| Communication Compatibility | Analogue 4–20 mA loop; compatible with 3500 Series rack I/O |
| Replacement Recommendation | Direct drop-in for 330106-05-30-20-02-CN; verify Proximitor gap calibration after swap |
| Commissioning Note | Re-zero gap voltage at Proximitor output; confirm OK relay state before restart |
| Warranty | 12 Months |
Retrofit Planning for Existing Automation Systems
Successful retrofit of the 330106-05-30-20-02-CN into an operating machinery protection system requires a structured pre-outage review. Begin by auditing the existing 3300 XL Proximitor Sensor — typically a 330180 or 330130 series driver — to confirm the extension cable length matches the replacement probe’s integral cable. The combined system length (probe + extension cable) must equal the Proximitor’s calibrated range; mismatches will shift the linear operating region and invalidate alarm setpoints stored in the 3500/40M or 3500/42M monitor module.
Next, review the terminal block wiring at the junction box. The 330106-05-30-20-02-CN uses the standard Bently Nevada colour-coded coaxial connector scheme. Confirm that the existing 330130-080-00-00 extension cable is free of shield breaks and that the BNC-to-terminal adapter at the monitor rack input is undamaged. If the rack houses a 3500 Series chassis, verify that the I/O module slot assignment and channel address in the System 1 configuration database match the replacement probe’s physical location — a mismatch here will cause the monitor to report a Not OK condition even with a correctly installed probe.
For sites migrating from older 3300/16 or 3300/20 monitor cards to the current 3500 platform, the 330106-05-30-20-02-CN is fully compatible with both generations, making it an ideal bridge component during a phased rack upgrade. During such migrations, the 3500 Rack Interface Module (RIM) and the 3500/22M Transient Data Interface should be configured before the new probe is energised, ensuring that all Modbus or Ethernet/IP communication links to the plant DCS or SCADA are re-established without data gaps. If the site uses a Rockwell ControlLogix or Siemens S7-300 PLC as the supervisory controller, confirm that the analogue input card scaling (typically 4–20 mA or ±10 V) matches the Proximitor output range before closing the control loop.
Power supply integrity is equally critical. The 3300 XL Proximitor requires a stable –24 VDC supply; verify that the existing power supply module — often a 3500/15 Power Supply — can sustain the additional current draw if multiple probes are being replaced simultaneously. Inadequate supply headroom is a common cause of intermittent Not OK alarms during multi-probe retrofit campaigns.
Downtime Control During System Migration
Minimising production loss during a proximity probe replacement begins with pre-staging. Before the planned outage window, bench-test the 330106-05-30-20-02-CN against a calibrated Proximitor to confirm the output voltage at the nominal 1.0 mm gap falls within the ±0.5 V tolerance band specified in the 3300 XL calibration certificate. Document the as-found gap voltage from the existing probe using the System 1 trend historian or a handheld voltmeter at the Proximitor output terminals — this baseline allows rapid comparison after installation.
During the outage, follow a parallel swap sequence: remove the old probe, install the 330106-05-30-20-02-CN, reconnect the extension cable, and restore –24 VDC power before re-enabling the monitor channel. This sequence keeps the monitor’s internal watchdog from latching a fault that would require a full rack reset. Once power is restored, confirm the OK LED on the Proximitor and the channel OK status in the 3500 monitor front panel before releasing the machine for restart. If the site’s safety instrumented system (SIS) is interlocked to the vibration monitor output, coordinate with the SIS engineer to bypass the interlock during the brief commissioning window and restore it immediately after the gap voltage is verified.
All replacement units are pre-tested prior to shipment and covered by a 12-month warranty against manufacturing defects, giving maintenance teams confidence that the replacement component will perform to specification from day one.
Retrofit Support FAQ
Q1: Is the 330106-05-30-20-02-CN a direct replacement for the original Bently Nevada part of the same number?
Yes. This unit is manufactured to the same dimensional, electrical, and sensitivity specifications as the original 330106-05-30-20-02-CN. No wiring changes or Proximitor recalibration are required beyond the standard gap voltage verification performed after any probe replacement.
Q2: Can this probe be used with a 3500 Series monitor rack instead of the original 3300 XL rack?
Yes. The 330106-05-30-20-02-CN is compatible with both the 3300 XL and 3500 Series monitor platforms. When used with a 3500/40M or 3500/42M module, ensure the channel configuration in the System 1 software reflects the correct probe sensitivity (typically 7.87 V/mm) and gap range.
Q3: What commissioning checks are required after installation?
After installation, measure the Proximitor output voltage with the shaft stationary at the nominal operating gap. Confirm the value falls within the monitor’s OK voltage window (typically –10 V to –18 V for a 1.0 mm gap). Check the OK relay output, verify alarm setpoints are active, and confirm the System 1 or DCS trend is receiving a live signal before returning the machine to service.
Q4: What warranty coverage is provided?
Every 330106-05-30-20-02-CN ships with a 12-month warranty covering manufacturing defects in materials and workmanship. Units are pre-tested before dispatch. For warranty claims or technical support, contact our team directly.
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