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Bently Nevada 330171-00-94-10-02-00 3300 Series 5 mm Proximity Probe

The Bently Nevada 330171-00-94-10-02-00, also cataloged as the 330171 3300 Series 5 mm Proximity Probe, operates as a dedicated hardware component for non-contact shaft displacement measurement within Bently Nevada TSI monitoring systems.

Hardware Specifications

Parameter	Specification
Model	330171-00-94-10-02-00
Brand	Bently Nevada
Product Type	3300 Series 5 mm Proximity Probe
Origin	USA
Dimensions	Overall case length: 9.4 in (238.8 mm); cable length: 1.0 m
Operating Temp	-35 deg C to +177 deg C
Power Consumption	Supplied by Proximitor Sensor; -17.5 VDC to -26 VDC at 12 mA max
Measurement Principle	Non-contact eddy current displacement measurement
Sensing Diameter	5 mm
Linear Range	2.0 mm (80 mils), typically 0.25 mm to 2.25 mm (10 to 90 mils)
Recommended Gap Setting	1.27 mm (50 mils)
Output Impedance	50 ohm
Mounting Thread	1/4-28 UNF
Case Material	Stainless steel AISI 304
Tip Material	Polyphenylene sulfide (PPS) with TipLoc molding
Cable Type	75 ohm triaxial FEP insulated cable
Connector Type	Gold-plated miniature coaxial ClickLoc connector
Cable Configuration	Standard cable without armor
Connector Locking Method	Finger-tight click-locking connection

Eddy Current Probe Scaling and Rotor Dynamics Measurement

The 330171 proximity probe applies Bently Nevada eddy-current probe scaling characteristics to convert shaft displacement changes into proportional electrical signals. The probe operates with a Proximitor Sensor to maintain the required excitation and signal conditioning loop.

Furthermore, the 5 mm sensing tip provides measurement capability in restricted mechanical clearances. The probe detects radial and axial shaft movement, allowing TSI systems to evaluate rotor dynamics parameters such as vibration amplitude, shaft position, and mechanical displacement behavior.

The recommended operating gap is 1.27 mm (50 mils), where the probe provides the specified linear response range. During commissioning, technicians verify gap voltage conditions to confirm correct probe positioning and signal output.

Frequently Asked Questions

Q: What measurement principle does the Bently Nevada 330171-00-94-10-02-00 use?
A: The probe uses non-contact eddy current measurement technology to detect shaft displacement changes between the probe tip and conductive target surface.

Q: Can the 330171 probe replace an 8 mm proximity probe in all applications?
A: No. The 5 mm sensing tip is designed for applications requiring reduced installation space. Engineers must verify mechanical clearance, target material, and monitoring system compatibility before replacement.

Q: What electrical interface does this proximity probe require?
A: The probe requires connection to a compatible Bently Nevada Proximitor Sensor that provides excitation power and processes the displacement signal.

Field Installation Guidelines

• Install the probe with the specified 1/4-28 UNF mounting thread and ensure mechanical alignment with the shaft target surface.
• Adjust the probe position to achieve the recommended 1.27 mm (50 mils) operating gap before final tightening.
• Maintain proper cable routing to reduce mechanical stress, sharp bending, and electromagnetic interference.
• Connect the ClickLoc miniature coaxial connector using the specified finger-tight locking method.
• Verify the signal output and gap voltage condition through the connected Proximitor Sensor before placing the monitoring channel into service.
• Maintain proper shield and grounding practices according to the installed Bently Nevada monitoring system configuration.

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