The 330104-00-04-10-02-05 is part of the Bently Nevada 3300 XL 8 mm proximity probe range. It’s a non-contact sensor used on rotating machinery to measure vibration and shaft position. You’ll usually find it on machines like turbines or compressors.

Main Applications:
It is mainly applied in shaft vibration monitoring, axial (thrust) position measurement, and shaft speed detection using Keyphasor signals.

Typical Equipment:
In practice, it’s commonly installed on critical rotating equipment such as steam turbines, gas turbines, centrifugal compressors, and large electric motors.

Operating Principle:
The system is based on eddy current sensing. As the probe gets closer or farther from the shaft surface (typically AISI 4140 steel), the output voltage changes accordingly. In real use, this gap change is what drives the signal response.

In normal setup, the probe gap voltage is around -10 V DC, usually staying within -9 to -11 V.

As the gap increases, the voltage shifts more negative. When the gap closes, it moves back toward the reference level.

On top of this steady DC signal, vibration shows up as an AC component. Together, they give both shaft position and vibration information. With a Keyphasor signal, phase reference can also be obtained.

A slow shift in DC level often points to mechanical or thermal changes, such as shaft growth, misalignment, or installation variation.

AC signal changes usually relate to vibration issues like imbalance or looseness. If the signal drifts gradually over time, it is often caused by installation conditions, probe contamination, or temperature influence.

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