The Bently Nevada 330104-00-07-90-12-05, also cataloged as the 330104 proximity probe, operates as an eddy-current sensor for vibration, shaft position, and speed measurements on fluid-film bearing machines.
Suffix Breakdown & Model Matrix
330104 → Base model, 3300 XL 8 mm proximity probe.
00 → Unthreaded length option, 0 mm.
07 → Overall case length, 70 mm.
90 → Total cable length, 9.0 m.
12 → Miniature coaxial ClickLoc connector with standard cable.
Eddy-current displacement and vibration measurement
Probe Tip Diameter
8 mm
Thread Size
Not threaded (0 mm option)
Cable Length
9.0 m
Connector
Miniature coaxial ClickLoc
Materials
Case: Stainless steel; Tip: PPS
Cable Seal
Viton O‑ring, FEP insulated
Impedance
75‑ohm coaxial system
Rotor Dynamics and Gap Voltage Validation
The probe is calibrated for gap voltage validation at –10 VDC targets, ensuring accurate displacement conversion. This calibration supports rotor dynamics monitoring in high-speed machinery. Eddy-current scaling provides linear response across the 2.0 mm range, while cross-talk suppression maintains fidelity in multi-probe installations.
Frequently Asked Questions
Q: What is the maximum cable length supported? A: This configuration provides a 9.0 m cable length.
Q: What approvals are included? A: CSA, ATEX, and IECEx hazardous area certifications are included under suffix –05.
Q: How does the probe maintain accuracy under thermal variation? A: The probe maintains linearity and accuracy across –52 °C to +177 °C operating range.
Field Installation Guidelines
Position probe tip perpendicular to shaft surface for accurate displacement measurement.
Maintain insertion depth to achieve –10 VDC gap reference.
Route coaxial cable with shielding grounded at a single point to minimize interference.
Avoid sharp bends in cable to prevent conductor fatigue.
Confirm driver calibration after installation to ensure proper scaling.
