Configured for precise rotor position and vibration measurement in rotating machinery, the Bently Nevada 330101-25-44-10-02-05 (330101-25-44-10-02-05 Proximity Probes) provides direct physical execution of eddy-current distance sensing within turbine monitoring systems.

Suffix Breakdown & Model Matrix

The 330101-25-44-10-02-05 follows the standard Bently Nevada 3300 XL 8 mm system nomenclature:

• 330101: 8 mm probe without armor.

• 25: 2.5 meter total length.

• 44: 1/4-28 UNF thread, side exit.

• 10: 10 mm probe tip option.

• 02: Total length (standard).

• 05: Agency approval (CSA/NRTL/C).

Hardware Specifications

Eddy-Current Probe and TSI Characteristics

This probe system operates on the eddy-current principle, requiring precise probe scaling to maintain linear output over the intended measurement range. Proper gap voltage validation is necessary during commissioning; the target operational setpoint is -10 VDC to ensure the probe remains in the linear region of the transducer curve. The 3300 XL system incorporates advanced cross-talk suppression, ensuring that adjacent probes in a multi-channel configuration do not interfere with signal accuracy. These probes are critical for monitoring rotor dynamics, detecting shaft centerline position, and identifying radial vibration signatures in high-speed turbomachinery.

Ordering info

• One (1) 330101-25-44-10-02-05 Proximity Probe.

• Protective tip cover.

• Technical compliance and installation instruction sheet.

• Note: Extension cables and Proximitor sensors are sold separately and must be compatible with the 3300 XL 8 mm system impedance.

Field Installation Guidelines

• Gap Setting: Utilize a feeler gauge or depth micrometer to set the initial mechanical gap; verify via the Proximitor output voltage (target: -10 VDC at mid-range).

• Torque Specs: Do not overtighten the jam nut; maintain torque limits defined in the installation manual to prevent probe body deformation or thread stripping.

• Cable Routing: Keep coaxial cables away from high-voltage lines to prevent induced noise; secure cables to prevent fatigue due to machine-induced vibration.

• Connector Protection: Ensure all coaxial connectors are clean and free of contaminants; apply silicone grease if the installation environment is high-humidity or corrosive.

• Alignment: Ensure the probe tip is centered over the target area to avoid signal distortion; target surface must be free of coatings or irregularities.

Frequently Asked Questions

• What is the target gap voltage for this probe?

  The standard operating gap voltage is -10 VDC, which corresponds to the mid-linear range of the transducer system.

• Can these probes be used in submerged applications?

  The probe is pressure-rated, but the connector interface and cable must be evaluated for chemical compatibility with the fluid.

• How does the 3300 XL system prevent signal interference?

  The 3300 XL system features RFI/EMI shielding and specialized signal filtering to minimize cross-talk and ambient noise in industrial environments.

• Is the tip of the probe replaceable?

  No. The probe tip is permanently bonded to the stainless steel body; the entire probe assembly must be replaced if the tip is damaged.

• What is the effect of changing the extension cable length?

  Changing the cable length will shift the calibration curve; the system must be calibrated as a complete set (Probe + Extension Cable + Proximitor).

• How do I identify a failed probe?

  A failure typically presents as a "gap voltage" error, where the voltage drifts to the power supply rail or drops to 0 VDC.

• What is the purpose of the 8 mm diameter?

  The 8 mm diameter is the industry standard for frequency response and linear range, providing an optimal balance for vibration and position monitoring.

• Does this probe require a specific target material?

  Yes. The transducer is calibrated for 4140 steel; other materials will require a material-specific calibration factor (scale factor adjustment).