Bently Nevada 330101-00-79-15-02-05 3300 XL 8mm Proximity Probe The Bently Nevada 330101-00-79-15-02-05, also cataloged as the 330101 proximity probe, operates...
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The Bently Nevada 330101-00-79-15-02-05, also cataloged as the 330101 proximity probe, operates as a dedicated hardware component for non-contacting displacement measurement within the 3300 XL eddy-current transducer system. It outputs an analog voltage proportional to probe tip-to-target distance, directly interfacing with a Proximitor sensor over a 75 ohm coaxial link.
Suffix Breakdown & Model Matrix
Segment
Code
Definition
Base Model
330101
3300 XL 8mm probe, 3/8-24 UNF thread, no armor
Unthreaded Length
00
0.0 in (fully threaded barrel)
Overall Case Length
79
7.9 in total probe case length
Total Cable Length
15
1.5 m integrated coaxial cable
Connector Option
02
Miniature coaxial ClickLoc connector, standard plug
Agency Approval
05
Multiple hazardous area certifications (ATEX, IECEx, CSA)
Hardware Specifications
Parameter
Specification
Brand
Bently Nevada
Origin
United States
Weight
0.25 kg approx.
Dimensions
Probe case length 7.9 in; cable length 1.5 m
Operating Temp
-51 degC to +177 degC
Power Consumption
Supplied via Proximitor; no standalone power input
Target Material
AISI 4140 steel (standard calibration)
Linear Range
2.0 mm (80 mils) from 0.25 mm standoff
Scale Factor
7.87 V/mm ±5.6%
Deviation from Best Fit
< ±0.025 mm
Probe Tip Material
Polyphenylene sulfide (PPS)
Case Material
303 stainless steel
Thread Size
3/8-24 UNF-2A
Connector Type
ClickLoc gold-plated brass coaxial
Max Tip Pressure
70 bar differential
Eddy-Current Probe Scaling and Gap Voltage Validation
This probe’s output scaling follows the Bently Nevada 200 mV/mil convention. When installed, gap voltage should be measured at the Proximitor terminal with the probe tip at the calibrated standoff; typical targets align near -10 VDC for mid-range operation. Correct scaling ensures rotor dynamic data reflects true shaft displacement without cross-talk interference from adjacent probes.
Frequently Asked Questions
Q: Can the probe be replaced without recalibrating the system?
A: No. Any change in probe, extension cable, or Proximitor requires verification of gap voltage and scale factor against the original system configuration.
Q: Is hot-swapping supported during machinery operation?
A: No. The coaxial circuit must be de-energized before disconnecting or reconnecting the probe to prevent transient surges into the monitoring system.
Q: What is the maximum permissible cable routing distance?
A: Total system length (probe + extension + Proximitor) must match the configured length of 5.0 m or 9.0 m; exceeding these values alters calibration accuracy.
Field Installation Guidelines
Mount the probe using the full thread engagement into the machine case, ensuring at least five threads are engaged for mechanical stability. Avoid sharp bends in the coaxial cable; maintain a minimum bend radius of 25 mm. Ground the shield at the Proximitor end only to prevent ground loops. Verify clearance between probe tip and rotating surface before final tightening to prevent mechanical contact during operation.
