The Bently Nevada 330876-02-10-00-00, also cataloged as the 3300 XL 50 mm Proximity Probe, operates as a dedicated hardware component for non-contact shaft position and dynamic displacement measurement within machinery protection systems. The transducer converts mechanical clearance changes into high-frequency eddy-current impedance shifts, maintaining linear voltage output proportional to target distance without physical surface contact.
Suffix Breakdown & Model Matrix
| Option Code | Parameter Designation | Configured Specification |
|---|---|---|
| 02 | Probe Case Type | M14x1.5 Thread Case |
| 10 | Total Length | 1.0 meter (3.3 feet) |
| 00 | Armor Option | High Temperature FluidLoc Cable |
| 00 | Agency Approval | No Approvals |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330876-02-10-00-00 |
| Brand | Bently Nevada |
| Origin | Made in U.S.A. |
| Weight | 2 kg (4.41 lbs) |
| Dimensions | M14x1.5 Thread Case, 1.0 meter total cable length |
| Operating Temp | -51 deg C to +200 deg C (-31 deg F to +392 deg F) |
| Power Consumption | Passive transducer element (powered via Proximitor Sensor) |
| Cable Armor | High Temperature FluidLoc Cable |
Eddy-Current Probe Scaling and Gap Voltage Validation
The 3300 XL 50 mm proximity probe utilizes high-frequency eddy-current probe scaling to convert target proximity into a modulated RF signal. During static bench testing and field calibration, gap voltage validation requires setting a nominal -10 VDC gap bias target at the Proximitor output under zero dynamic load. This baseline voltage ensures the sensor remains centered within its linear operating range, preventing signal saturation during large rotor dynamics excursions and thermal expansion events. Shielded coaxial routing minimizes signal cross-talk suppression between adjacent channels in dense machinery monitoring installations.
Frequently Asked Questions
Q: What is the required gap voltage target during installation setup? A: The standard gap voltage target is -10 VDC, corresponding to the midpoint of the linear operating range when measured against an AISI 4140 steel target.
Q: Can the cable length be shortened or lengthened in the field? A: No. Modifying the 1.0 meter physical cable length alters the matched electrical system capacitance and degrades probe scaling accuracy.
Field Installation Guidelines
Mount the probe body securely using M14x1.5 threaded mounting hardware. Maintain a minimum thread engagement of 5 full turns. Ensure probe tip clearance exceeds two tip diameters from adjacent side-wall metallic structures to avoid phantom loading. Route the High Temperature FluidLoc cable through dedicated metallic conduit, terminating coax shields cleanly at the system junction box to establish single-point isolation ground without earth loops.
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