Overview
Configured for shaft displacement measurement in the Bently Nevada 3300 monitoring system, the Bently Nevada 330851-02-000-060-50-00-CN (330851 3300 XL 25 mm Proximity Probe) provides direct eddy-current sensing for rotor position and vibration monitoring circuits.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330851-02-000-060-50-00-CN |
| Brand | Bently Nevada |
| Product Type | 3300 XL 25 mm Proximity Probe |
| Origin | USA |
| Weight | 0.2 kg |
| Dimensions | 20.5 x 22.5 x 3.5 cm (shipping size) |
| Power Consumption | Supplied by compatible proximity transducer system |
| Thread Type | M30 x 2 thread |
| Total Length | 5.0 m (16.4 ft) |
| Armor Option | No Armor |
| Agency Approval | No Approvals |
| Unthreaded Length | Minimum 0 mm |
| Cable Configuration | 5.0 m integral cable option |
Eddy-Current Probe Scaling and Rotor Dynamics Measurement
The 330851-02-000-060-50-00-CN uses eddy-current sensing technology to measure relative shaft displacement between the probe tip and the rotating target surface. The system converts the measured gap change into an electrical signal for use with compatible Bently Nevada proximity monitoring channels.
Additionally, the probe supports rotor dynamics analysis by providing displacement data required for vibration evaluation, shaft position monitoring, and machinery protection functions. The proximity system requires proper gap voltage validation, with Bently Nevada installations commonly referencing -10 VDC target gap conditions for calibration verification.
The probe design maintains signal stability through controlled electromagnetic characteristics. Therefore, correct probe installation, cable routing, and target surface conditions directly affect measurement accuracy.
Frequently Asked Questions
Q: What measurement principle does the 330851-02-000-060-50-00-CN use?
A: The probe uses eddy-current technology to detect shaft displacement by measuring the electrical field change between the probe tip and the conductive target surface.
Q: Does this model include armored cable protection?
A: No. The 330851-02-000-060-50-00-CN configuration specifies the No Armor option.
Q: What installation factors affect proximity probe performance?
A: Probe gap setting, mounting thread condition, cable routing, electrical grounding, and target surface quality affect the final measurement signal.
Field Installation Guidelines
- Install the probe with the specified M30 x 2 mounting thread and maintain proper mechanical alignment with the monitored shaft surface.
- Keep the extension cable away from high-current power conductors and strong electromagnetic interference sources.
- Connect cable shielding according to the monitoring system grounding requirements to reduce electrical noise.
- Verify probe gap voltage after installation before commissioning the protection channel.
- Inspect the probe tip and cable jacket for mechanical damage before system startup.
- Confirm that the connected monitoring module matches the electrical characteristics of the 3300 XL proximity system.
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