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Help CenterBently Nevada 330906-02-12-05-02-CN 3300 NSv Reverse Mount Probe – Compact Eddy-current Sensing for Tight Spaces and Small Shaft Targets
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Warranty: 365 days
Delivery: 1 week for in-stock items; no more than one month at the latest
Payment: 50% advance payment, full payment before delivery
Express delivery: FedEx, UPS, DHL
Packaging: Anti-static and vibration-safe packing suitable for international transit
Reverse-mount design – Installs from the inside of the machine case for better cable protection and a clean external profile. You might notice fewer cable rub issues in cramped skids.
NSv (narrow side-view) form factor – Optimized for limited radial clearance and smaller shaft diameters where a short linear range is acceptable and desirable.
Stable eddy-current measurement – Provides precise gap and vibration data when used with the 3300 NSv Proximitor Sensor, typically with the familiar −200 mV/mil scale factor at the monitor.
System compatibility – Works with Bently Nevada monitoring systems (e.g., 3500 series), so drop-in upgrades are straightforward in many cases.
Industrial build – Probe materials and construction suitable for harsh, oily environments typically found around rotating equipment.
Flexible lengths and threads – Available in common thread types and system lengths that align with standard Bently Nevada installation practices.
| Brand / Model | Bently Nevada 330906-02-12-05-02-CN (3300 NSv Reverse Mount Probe) |
| HS Code | 903180 (Measuring/Checking Instruments—Proximity/Vibration sensors) |
| Power Requirements | Passive probe; powered via 3300 NSv Proximitor Sensor (no direct power to the probe) |
| Signal Input/Output Types | Eddy-current proximity measurement; system output is a voltage proportional to gap/vibration via Proximitor (nominal −200 mV/mil typical) |
| Communication Interfaces | None (analog proximity system via Proximitor) |
| Installation Method | Reverse-mount into a prepared bore; set gap with feeler gauge/fixture; lock with jam nut per Bently Nevada practice |
| Dimensions & Weight | Compact reverse-mount body with slim sensing tip; overall length and thread type depend on ordered options |
| Compatible Components | 330910 3300 NSv Proximitor Sensor; 330901 Extension Cable (system lengths typically 5 m / 7 m / 9 m) |
This probe is used where machine envelopes are tight and measurement points are tucked away. Typical applications include:
Small and medium centrifugal compressors (limited radial access near seals and bearings)
Gearboxes and high-speed auxiliary drives (where standard 8 mm probes are too large)
Pumps, fans, and blowers with compact bearing housings
Steam and gas turbine auxiliaries, including turning gear monitors
A maintenance supervisor told us their cable damage incidents dropped after moving to reverse-mount on a compact gearbox. That kind of field feedback seems to be common with NSv setups in congested skids.
Reliability – Reverse routing helps protect the cable run and reduces accidental snagging during maintenance.
Compatibility – Works within the Bently Nevada 3300 NSv chain, integrating smoothly to 3500/3701 monitors already on many sites.
Cost savings – In many cases a direct replacement that avoids re-machining the case or changing rack configurations.
Support – Clear identification, traceability, and technical support for system setup, including gap and linear range guidance.
Mounting: Prepare the bore and counterbore to the specified thread/seat; insert from the inside (reverse mount) and lock with the jam nut. Maintain the recommended standoff to the target.
Cabinet & wiring: Route the extension cable away from high-voltage and VFD cables; maintain bend radius; ground the Proximitor and cabinet per site standards (EN/NEC).
Gap setting: Set cold gap using a feeler gauge or target fixture; verify mid-range on the monitor during commissioning.
Ventilation: Place the Proximitor in a ventilated panel; avoid hot zones that could drift the electronics.
Routine care: Periodically inspect for rub marks, loose hardware, or oil ingress; clean the sensing area; verify bias voltage and scale factor during planned outages.
Firmware/monitor checks: When tied to 3500/3701 monitors, keep configuration backups and confirm alarm setpoints after any maintenance.
Manufacturer quality system: ISO 9001
Conformity: CE and RoHS compliance are typically available for 3300 NSv system components
Warranty: 365 days from shipment
Bently Nevada 330910 – 3300 NSv Proximitor Sensor (drives the probe and conditions the signal to the monitor)
Bently Nevada 330901 – Extension Cable (choose length to match your total system length and conduit plan)
Mounting hardware – Jam nut and appropriate thread adapters where required
One thing I appreciate is how predictable the NSv system is once the mechanics are correct—good gap, clean routing, and it just runs. If you want us to verify the code “330906-02-12-05-02-CN” against your installed thread type and system length, send a photo of the nameplate or your existing BOM and we’ll cross-check before shipping.
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