Bently Nevada 330905-00-19-10-02-00 Retrofit-Ready Proximity Probe for 3300 NSv Control Systems
The Bently Nevada 330905-00-19-10-02-00 is a 19 mm eddy current proximity probe designed for the 3300 NSv series vibration monitoring system. As legacy 3300 XL and 3300 NSv installations reach end-of-service milestones, this probe serves as a verified drop-in replacement that preserves existing wiring, conduit routing, and signal chain integrity without requiring panel redesign or software reconfiguration. Whether you are executing a planned outage upgrade, responding to a probe failure, or modernizing a rotating machinery protection loop, the 330905-00-19-10-02-00 delivers the dimensional and electrical compatibility required for a low-risk, minimum-downtime retrofit.
This probe ships with a 10-meter integral cable and is calibrated for use with the standard Bently Nevada 3300 XL 8 mm extension cable and 3300 XL proximitor sensor. The 19 mm tip diameter and M20 thread form factor match the original mounting boss dimensions found in most turbine, compressor, and pump bearing housings that were originally commissioned with 3300-series instrumentation. No re-machining of the probe holder is required in the vast majority of retrofit scenarios.
Upgrade Compatibility Table
| Parameter | Detail |
|---|---|
| SKU / Part Number | 330905-00-19-10-02-00 |
| Series Compatibility | Bently Nevada 3300 NSv, 3300 XL |
| Probe Tip Diameter | 19 mm |
| Cable Length | 10 m integral cable |
| Thread Form | M20 × 1.0 |
| Proximitor Compatibility | 3300 XL Proximitor Sensor (330180-XX-XX) |
| Extension Cable Compatibility | 3300 XL 8 mm Extension Cable (330130-XX-XX) |
| Signal Output | –24 VDC bias, standard eddy current output |
| Installation Requirement | M20 probe holder; no re-machining required for standard 3300 NSv installations |
| Communication / Protocol | Analog (4–20 mA loop or direct voltage to monitor rack) |
| Monitor Rack Compatibility | 3500/40M, 3500/42M, 3500/45, 3500/46M proximity monitor modules |
| Replacement Recommendation | Direct replacement for discontinued 330905 variants; verify gap voltage at commissioning |
| Commissioning Check | Set air gap to achieve –10 VDC ± 0.5 VDC at target; verify with 3500 rack OK relay |
| Warranty | 12 months from date of shipment |
Retrofit Planning for Existing Automation Systems
A successful retrofit of the 330905-00-19-10-02-00 begins well before the maintenance window opens. Engineers should pull the existing loop drawing to confirm the proximitor model — typically a 330180-51-00 or 330180-91-00 — and verify that the extension cable part number (commonly 330130-080-00-00 for 8-meter runs) is still within its service life. If the extension cable shows signs of jacket cracking or connector corrosion, replacing it alongside the probe eliminates a second unplanned outage.
On the monitor rack side, confirm the slot assignment in the 3500 rack. The 3500/40M and 3500/42M proximity monitor modules accept the standard –24 VDC bias supply and will not require reconfiguration when the probe is swapped like-for-like. However, if the site is migrating from an older 3300 rack to a 3500 series rack as part of a broader control system upgrade, the I/O terminal block wiring must be re-mapped. The 3500 rack uses a different I/O module pinout compared to the legacy 3300 monitor, and the field wiring from the junction box to the rack terminal board will need to be re-landed accordingly.
For sites running a System 1 condition monitoring platform, the channel configuration in the software database must reflect the new probe sensitivity (typically 7.87 V/mm for the 3300 NSv series) and the updated gap voltage setpoint. If the plant historian or DCS — such as a Honeywell Experion PKS or Emerson DeltaV system — is receiving vibration data via Modbus or OPC from the 3500 rack gateway, no changes to the communication link are required as long as the rack channel mapping remains unchanged.
Sites that are simultaneously upgrading their safety instrumented system should coordinate the probe replacement with the SIS logic solver proof test schedule. If the vibration channel feeds a SIL-rated shutdown function, the proof test record must be updated to reflect the new probe serial number and the as-found / as-left gap voltage readings. The 3500/20 rack interface module and the associated 3500/92 communication gateway should be verified for firmware compatibility if the site is also updating the System 1 software version during the same outage window.
Spare parts staging is equally important. A complete retrofit kit for a single measurement point typically includes the 330905-00-19-10-02-00 probe, the matching 330130 extension cable, a 330180 proximitor, and a set of probe holder lock nuts. Having all components on the shelf before the outage begins eliminates the risk of a partial replacement that leaves the loop in a degraded state.
Downtime Control During System Migration
Minimizing downtime during a proximity probe replacement requires a disciplined pre-outage checklist and a clear sequence of operations. Before the machine is taken offline, the existing gap voltage should be recorded from the 3500 rack display or the System 1 trend screen. This baseline reading — typically between –9.5 VDC and –10.5 VDC for a healthy installation — serves as the acceptance criterion for the new probe after installation.
Once the machine is isolated and locked out, the probe can be removed by backing out the lock nut and unscrewing the probe body from the holder. The new 330905-00-19-10-02-00 should be threaded in by hand until the tip is approximately 1.0 mm from the shaft surface, then adjusted to achieve the target gap voltage using a calibrated gap tool or a digital voltmeter connected to the proximitor output terminals. The lock nut should be torqued to the value specified in the Bently Nevada installation drawing to prevent probe migration during machine restart.
After the gap is set, the 3500 rack OK relay status should be confirmed before the machine is released for restart. If the site uses a bypass key switch on the 3500/20 rack interface module, the bypass should be removed only after the gap voltage is verified and the channel alarm setpoints have been confirmed against the original configuration. This sequence protects the original program logic in the 3500 rack and ensures that the vibration protection function is fully restored before the machine returns to service.
For plants running continuous processes where a cold shutdown is not feasible, a hot-swap procedure using the 3500 rack’s channel inhibit function can be used to replace the probe while the machine remains online. This approach requires strict adherence to the Bently Nevada hot-swap procedure and should only be performed by qualified personnel with direct authorization from the site machinery engineer.
Retrofit Support FAQ
Q1: Is the 330905-00-19-10-02-00 a direct replacement for all 330905 variants?
The 330905-00-19-10-02-00 is dimensionally and electrically compatible with most 330905 series variants used in 3300 NSv and 3300 XL installations. The key differentiators are cable length (10 m for this part number) and connector type. Always verify the cable length suffix and connector configuration against your existing loop drawing before ordering. If your installation uses a different cable length, the corresponding 330905 variant with the matching suffix should be selected.
Q2: What commissioning checks are required after installation?
After installation, set the air gap to achieve a proximitor output of –10 VDC ± 0.5 VDC at the operating shaft position. Verify the 3500 rack channel OK status, confirm that the vibration and position readings are within expected ranges at slow roll, and check that all alarm and danger setpoints are active and correctly configured. Record the as-left gap voltage in the maintenance management system for future reference.
Q3: Will this probe work with my existing 3500 rack wiring without re-termination?
If you are replacing a like-for-like 330905 probe in an existing 3300 NSv or 3300 XL installation, no re-termination is required at the 3500 rack terminal board. The field wiring from the junction box to the rack I/O module remains unchanged. Re-termination is only required if you are simultaneously migrating from a legacy 3300 monitor rack to a 3500 series rack.
Q4: What does the 12-month warranty cover?
All units are covered by a 12-month warranty from the date of shipment against manufacturing defects and functional failures under normal operating conditions. The warranty covers the probe body, integral cable, and connector. It does not cover damage resulting from improper installation, mechanical impact, chemical exposure, or operation outside the specified environmental limits. Warranty claims are processed through our sales team at sales@smartnexmsk.com.
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