Overview
The Bently Nevada 330876-02-50-00-00, also cataloged as the 330876 3300 XL 50 mm Proximity Probe, operates as a dedicated hardware component for large shaft displacement measurement within Bently Nevada TSI monitoring systems. The probe provides eddy-current signal conversion for axial position and vibration monitoring on rotating machinery.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330876-02-50-00-00 |
| Brand | Bently Nevada |
| Product Type | 3300 XL 50 mm Proximity Probe |
| Origin | USA |
| Weight | Not specified |
| Dimensions | 50 mm probe sensing system, dimensions not specified |
| Operating Temp | Continuous operation up to 200 deg C; intermittent operation up to 250 deg C |
| Power Consumption | Supplied through compatible Bently Nevada proximity instrumentation system; value not specified |
| Probe Case Type | M14 x 1.5 metric threaded case, straight exit |
| Cable Length | 5.0 m total length |
| Cable Type | High-temperature FluidLoc cable without stainless steel armor |
| Linear Range | 27.9 mm (1100 mils) |
| Average Scale Factor | 394 mV/mm (10 mV/mil) nominal |
| Target Material | Flat AISI 4140 steel target, minimum 102 mm diameter |
Eddy-Current Probe Scaling and Rotor Dynamics Monitoring
The 330876-02-50-00-00 uses eddy-current probe scaling to convert shaft displacement into proportional electrical output signals. The 3300 XL 50 mm sensing structure provides an extended linear range for applications that require measurement of large shaft movements.
The probe operates with gap voltage validation methods based on the -10 VDC target range used in Bently Nevada proximity measurement systems. Therefore, technicians can verify probe positioning and signal conditioning before machinery operation.
The large sensing diameter supports rotor dynamics analysis by providing displacement feedback for axial position, vibration behavior, and mechanical movement evaluation. Additionally, the FluidLoc cable construction limits fluid penetration through the probe assembly in high-temperature machinery environments.
Frequently Asked Questions
Q: What measurement range does the Bently Nevada 330876-02-50-00-00 provide?
A: The probe provides a 27.9 mm (1100 mils) linear measurement range for large shaft displacement monitoring.
Q: What cable configuration does this probe use?
A: This configuration uses a 5.0 m high-temperature FluidLoc cable without stainless steel armor.
Q: How should the probe gap voltage be verified during installation?
A: Technicians should verify the probe gap voltage against the Bently Nevada -10 VDC target condition to confirm correct probe positioning and signal operation.
Field Installation Guidelines
Install the probe using the specified M14 x 1.5 metric threaded mounting interface and maintain mechanical alignment with the monitored shaft surface.
Ensure the probe tip faces a suitable AISI 4140 steel target with the required target diameter and surface condition. Avoid installation locations with excessive mechanical runout or external electromagnetic interference.
Route the FluidLoc cable away from high-current power conductors and use proper cable separation practices. Connect cable shielding according to the monitoring system grounding requirements to reduce electrical noise.
Verify probe clearance, mechanical fixation, and electrical output before placing the rotating equipment into service. Confirm the gap voltage value and signal response through the connected Bently Nevada monitoring channel.
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