Configured for non-contact shaft displacement measurement in eddy-current transducer chains within 3300 XL monitoring architectures, the Bently Nevada 330102-40-62-05-02-05 (330102 Proximity Probe) provides direct physical/electrical execution of gap-to-voltage conversion using a calibrated 8 mm probe geometry.
Technical Summary
The device operates as a 3300 XL 8 mm eddy-current proximity probe designed to interface with a matching Proximitor sensor and extension cable. It converts conductive target displacement into a proportional analog voltage used for vibration, axial position, and shaft eccentricity measurement. Output behavior is defined by a linear response region referenced to calibrated steel targets, with frequency response extending from DC to 10 kHz.
Hardware Specifications
Parameter
Specification
ModelBrand
Bently Nevada 330102-40-62-05-02-05
Dimensions
Probe form factor: 3300 XL 8 mm threaded probe, 3/8-24 UNF interface
OperatingTemp
-51 degC to +177 degC
PowerConsumption
Passive probe, driven by Proximitor oscillator circuit
System Linear Range
2.0 mm (80 mils)
Scale Factor
7.87 V/mm (200 mV/mil) with 3300 XL Proximitor
Frequency Response
DC to 10 kHz
Pressure Rating
Up to 7 bar (100 psi) at probe tip region
Connector Type
ClickLoc coaxial connector
Eddy-Current Probe Scaling and Gap Voltage Validation
The 330102 probe operates on eddy-current field collapse within a conductive target surface. The 3300 XL system applies a high-frequency carrier signal to the probe coil, producing a demodulated DC output proportional to gap distance. Standard calibration references AISI 4140 steel to establish linearity across the defined operating range. Gap voltage validation is referenced to negative DC bias regions typically centered around -10 VDC in full system scaling configurations, ensuring consistent transducer chain alignment. Signal integrity depends on controlled impedance matching between probe, extension cable, and Proximitor sensor, minimizing amplitude distortion across long cable runs.
Frequently Asked Questions
Q: Can the 330102 probe operate without a matching Proximitor sensor? A: No. The probe requires a 3300 XL Proximitor sensor to generate excitation and convert impedance variation into usable voltage output.
Q: What limits the linear measurement range of the probe? A: The linear region is defined by coil geometry and target coupling efficiency, typically constrained to 2.0 mm displacement within calibrated response limits.
Q: Does cable length affect signal amplitude? A: Yes. Cable capacitance and impedance directly affect oscillator stability and must be matched with system-rated extension cable lengths.
Field Installation Guidelines
Maintain a rigid mechanical mounting structure to prevent probe-to-target relative motion outside the measurement axis. Ensure 3/8-24 UNF thread engagement is fully seated without over-torque. The probe tip must be aligned perpendicular to the shaft surface to preserve eddy-current field symmetry. Shielded coaxial routing is required along the full cable path, with the shield grounded at a single control system reference point to prevent ground loop interference. Minimum bend radius of 25.4 mm must be maintained to avoid dielectric deformation. Avoid proximity to high electromagnetic noise sources such as VFD output conductors.
