Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 330903-00-21-10-02-05 |
| Brand | Bently Nevada |
| Product Type | Eddy Current Proximity Probe |
| Series | 3300 XL NSv |
| Probe Thread | M8 x 1 metric thread |
| Probe Case Length | 210 mm |
| Unthreaded Length | 0 mm |
| Cable Length | 1.0 m |
| Connector Type | Miniature coaxial ClickLoc connector |
| Cable Type | Standard unarmored cable |
| Measurement Range | 1.5 mm linear range |
| Average Scale Factor | 7.87 V/mm (200 mV/mil) nominal |
| Target Material | AISI 4140 steel |
| Minimum Target Diameter | 8.9 mm; 13 mm recommended |
| Frequency Response | 0 Hz to 10 kHz |
| Case Material | 300 series stainless steel |
| Tip Material | Polyphenylene sulfide (PPS) |
| Cable Pull Strength | 220 N (50 lbs) maximum |
| Operating Temp | -52 deg C to +177 deg C |
| Power Consumption | Supplied by compatible Bently Nevada proximity signal conditioner |
| Origin | USA |
Eddy-Current Scaling and Rotor Dynamics Measurement
The 3300 XL NSv probe uses eddy-current sensing technology to convert shaft displacement into proportional electrical signals. The probe maintains a nominal scale factor of 200 mV/mil (7.87 V/mm), allowing compatible TSI monitors to evaluate radial vibration, axial position, and Keyphasor reference signals.
Furthermore, the probe geometry supports restricted installation areas where standard 8 mm probes cannot fit. The small tip diameter and narrow side-view construction improve measurement access near compact bearings, compressor assemblies, and reduced clearance machine layouts.
The system validates probe operation through gap voltage measurement. During setup, technicians verify the DC gap voltage condition and adjust the probe position toward the typical -10 VDC target range used for Bently Nevada eddy-current monitoring systems.
Frequently Asked Questions
Q: What signal does the Bently Nevada 330903-00-21-10-02-05 provide to the monitoring system?
A: The probe outputs an eddy-current displacement signal proportional to the distance between the probe tip and the rotating target surface. The compatible driver converts this signal into vibration, position, or phase reference data.
Q: Can the 330903-00-21-10-02-05 measure small shaft targets?
A: Yes. The NSv probe design supports smaller target diameters, with 8.9 mm as the minimum specified target diameter and 13 mm recommended for standard performance.
Q: What installation factors affect probe measurement accuracy?
A: Correct gap setting, target material consistency, cable routing, connector condition, and proper shielding practices affect measurement accuracy and signal stability.
Field Installation Guidelines
- Install the M8 x 1 threaded probe body with correct mechanical alignment to the rotating target surface.
- Set the probe gap according to the compatible Bently Nevada driver and monitoring system requirements.
- Verify the DC gap voltage before commissioning to confirm proper eddy-current operating conditions.
- Route the coaxial cable away from high-current power conductors to reduce electromagnetic interference.
- Maintain clean and secure ClickLoc connector engagement during installation.
- Confirm the target material matches the calibration requirements before final vibration measurement.
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