The Bently Nevada 330100-90-02, also cataloged as the 330100 Proximity Probe, operates as a dedicated hardware component for non-contact displacement transduction within 3300 XL eddy current transducer systems. It generates an RF carrier signal reflection proportional to the air gap between the probe tip and a conductive target surface.
Thread: 3/8-24 UNF; Unthreaded: 229 mm; Case: 51 mm
Operating Temp
-52 degC to +177 degC
Power Consumption
Passive sensor; powered via external Proximitor Sensor
Target Material
AISI 4140 Steel
Linear Range
2.0 mm (80 mils)
Scale Factor
7.87 V/mm (200 mV/mil)
Frequency Response
0 Hz to 10 kHz
Probe Tip Material
Polyphenylene sulfide (PPS)
Probe Case Material
303 Stainless Steel
Connector
Gold-plated coaxial ClickLoc
Tensile Strength
330 N (75 lbf) max pull
Eddy-Current Probe Scaling and Gap Validation
The probe exhibits a scale factor of 7.87 V/mm when terminated into a standard 3300 XL Proximitor Sensor. System linearity remains within +/- 0.038 mm across the 2.0 mm span. During installation, gap voltage validation targets -10 VDC relative to the Proximitor ground plane to ensure correct mechanical clearance and coil resistance alignment prior to turbine roll.
Frequently Asked Questions
Q: Is the 330100-90-02 compatible with older 3300 series extension cables?
A: No. The 3300 XL probes require 3300 XL extension cables to maintain impedance matching and RF characteristics. Mixing with non-XL components alters the scale factor and invalidates calibration.
Q: What is the minimum bend radius for the probe cable?
A: Maintain a minimum bend radius of 25.4 mm (1 inch) to prevent dielectric stress and signal attenuation in the coaxial assembly.
Q: Does the probe require calibration when replacing a damaged unit?
A: No. Probes are interchangeable within the same model number without recalibration, provided the mating Proximitor Sensor and extension cable remain unchanged.
Field Installation Guidelines
Install the probe ensuring the unthreaded section clears the machine housing bore. Torque the 3/8-24 UNF threads to 8.5 N-m (75 in-lb) using two wrenches to prevent case rotation. Ground the outer shield of the extension cable to the machinery case at the probe entry point only. Verify the probe tip does not contact the shaft during maximum axial excursion.
