Overview
Suffix Breakdown & Model Matrix
| Option Code | Specification |
|---|---|
| Base Model | 330905 3300 NSv Proximity Probe |
| Thread Configuration | M10 x 1 metric thread |
| Armor Option | Without armor |
| Unthreaded Length | 120 mm |
| Overall Case Length | 220 mm |
| Total Length | 0.5 m |
| Connector Type | Miniature coaxial ClickLoc connector |
| Cable Type | Standard coaxial cable |
| Agency Approval | Multiple approvals |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330905-12-22-05-02-05 |
| Brand | Bently Nevada |
| Product Type | Proximity Sensors |
| Origin | USA |
| Dimensions | Unthreaded length 120 mm; overall case length 220 mm; total length 0.5 m |
| Operating Temp | -34 deg C to +177 deg C |
| Power Consumption | Supplied by Proximitor Sensor with -24 VDC excitation |
| Probe Type | 3300 NSv Narrow Side-view Proximity Probe |
| Measurement Principle | Eddy-current displacement measurement |
| Linear Range | 1.5 mm |
| Scale Factor | 7.87 V/mm nominal |
| Target Material | AISI 4140 steel |
| Thread Size | M10 x 1 fine metric thread |
| Probe Tip Diameter | 5 mm nominal |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 304 stainless steel |
| Cable Construction | 75 ohm coaxial cable with FEP insulation |
| Connector | Miniature coaxial ClickLoc connector |
| Storage Temperature | -51 deg C to +177 deg C |
Eddy-Current Probe Scaling and Gap Voltage Validation
The Bently Nevada 330905 series uses eddy-current sensing technology to convert shaft displacement into proportional electrical output signals. Therefore, the probe maintains a nominal scale factor of 7.87 V/mm for vibration and position monitoring.
The probe operates with a Proximitor Sensor that provides excitation and signal conditioning. During installation, technicians validate the probe gap voltage to confirm the correct operating position. Bently Nevada systems commonly use a -10 VDC target gap voltage for standard calibration verification.
Additionally, the 3300 NSv design supports rotor dynamics analysis in restricted mounting locations. The narrow side-view structure allows measurement on smaller diameter shafts and limited axial target surfaces while maintaining displacement signal accuracy.
Frequently Asked Questions
Q: What measurement principle does the 330905-12-22-05-02-05 use?
A: The probe uses eddy-current technology to measure shaft displacement and provides proportional output through a compatible Proximitor Sensor.
Q: Can this probe operate without a Proximitor Sensor?
A: No. The probe requires a Bently Nevada Proximitor Sensor to provide excitation voltage, signal conditioning, and monitoring interface functions.
Q: What installation conditions require the 3300 NSv probe design?
A: The probe is designed for applications with restricted clearance, side-view mounting limitations, small shaft diameters, or limited axial target areas.
Field Installation Guidelines
Install the probe with the M10 x 1 thread connection according to the mechanical mounting requirements of the monitoring location. Verify that the probe tip has a clear measurement path toward the target surface before final tightening.
Maintain proper cable routing to reduce mechanical stress on the miniature coaxial ClickLoc connector. Avoid sharp cable bends and keep the probe cable separated from high-voltage power conductors to reduce electrical interference.
Before commissioning, check the probe gap voltage through the connected Proximitor Sensor. Confirm that the signal output changes consistently with shaft movement and that the mounting position remains within the calibrated measurement range.
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