Configured for high-precision rotor position and vibration measurement in industrial rotating machinery, the Bently Nevada 330101-38-49-20-02-05 (330101-38-49-20-02-05 8 mm Proximity Probes) provides direct physical execution of eddy-current displacement sensing within turbine monitoring (TSI) systems.

Suffix Breakdown & Model Matrix

The 330101-38-49-20-02-05 conforms to the Bently Nevada 3300 XL 8 mm transducer system nomenclature:

• 330101: 8 mm probe without armor.

• 38: Unthreaded length (380 mm).

• 49: Overall case length (490 mm).

• 20: Total length (2.0 meters).

• 02: Connector type (connector without housing).

• 05: Agency approval (CSA/NRTL/C).

Hardware Specifications

Eddy-Current Sensing and Rotor Dynamics

This transducer system utilizes eddy-current induction to detect shaft displacement, requiring precise probe scaling to maintain linear output over the measurement range. During commissioning, gap voltage validation is a mandatory step; the system targets an operational setpoint of -10 VDC to position the probe at the mid-point of its linear sensing region. The 3300 XL architecture features sophisticated cross-talk suppression, which prevents signal interference between adjacent sensor channels in high-density TSI rack configurations. These probes are essential for monitoring rotor dynamics, detecting shaft centerline position, and identifying radial vibration signatures in high-velocity industrial machinery.

Ordering info

• One (1) 330101-38-49-20-02-05 Proximity Probe.

• Protective tip cover.

• Technical compliance documentation (CSA/NRTL/C certified).

• Note: Extension cables and Proximitor sensors must be impedance-matched to the 3300 XL 8 mm system requirements.

Field Installation Guidelines

• Mechanical Alignment: Ensure the probe is mounted perpendicularly to the target shaft; use a rigid bracket to prevent mechanical resonance and bias.

• Gap Setting: Establish the mechanical gap using a depth micrometer; verify the output voltage at the Proximitor terminal block (Target: -10 VDC).

• Cabling: Route coaxial leads through dedicated conduit; maintain separation from high-voltage AC cables to minimize induced noise.

• Connector Engagement: Ensure click-loc connectors are fully seated; a positive click must be felt to confirm electrical continuity and shielding integrity.

• Thread Management: Apply torque to jam nuts to secure the probe position, ensuring vibration does not cause the gap to drift during operation.

Frequently Asked Questions

• Why is the unthreaded length (380 mm) specific to this model?

  The 380 mm unthreaded length accommodates deep mounting requirements in thick machine casings where standard shorter probe bodies cannot reach the shaft target.

• Does this probe require a matched extension cable?

  Yes. The 3300 XL system is calibrated as a set (Probe + Extension Cable + Proximitor); replacing one component requires verifying system-wide calibration.

• Can I use this probe in a hazardous area?

  The "05" suffix indicates CSA/NRTL/C agency approval, making it suitable for specified hazardous locations; verify local certification requirements before installation.

• How is signal integrity maintained over the 2.0 meter length?

  The cable uses high-quality shielding and impedance-controlled coaxial geometry to minimize signal attenuation and RFI interference.

• What is the target gap voltage for this model?

  The target gap voltage is -10 VDC, which positions the probe in the center of its linear range for optimal vibration measurement accuracy.

• Can the probe tip be repaired if damaged?

  No. The probe tip is permanently sealed; any damage to the tip or body requires replacing the entire probe assembly.

• Is the probe affected by target material variations?

  Yes. The transducer is calibrated for 4140 steel. If the target material differs, an adjustment to the scale factor is required to prevent measurement errors.

• How is a damaged cable detected by the TSI system?

  Damage typically results in a "Gap Error" signal on the monitor, caused by open or short circuits that drive the voltage outside the -10 VDC nominal target.