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Bently Nevada 330908-12-31-10-02-00 3300 NSv Proximity Probe

The Bently Nevada 330908-12-31-10-02-00, also cataloged as the 330908 3300 NSv Proximity Probe, operates as a dedicated hardware component for eddy-current displacement measurement within the 3300 NSv Proximity Transducer System. The probe converts shaft target position changes into proportional voltage signals for vibration, position, and Keyphasor monitoring applications.

Hardware Specifications

Parameter	Specification
Model	330908-12-31-10-02-00
Brand	Bently Nevada
Product Type	3300 NSv Eddy Current Proximity Probe
Origin	USA
Dimensions	3/8-24 UNF thread; 1.2 in unthreaded length; 3.1 in overall case length
Operating Temp	-34 deg C to +177 deg C
Power Consumption	Powered by compatible 3300 NSv Proximity Transducer System driver
Thread Type	3/8-24 UNF-2A
Armor Configuration	Without armor
Cable Length	1.0 m
Cable Type	75 ohm coaxial cable with FEP insulation
Connector Type	Miniature coaxial ClickLoc connector
Measurement Principle	Eddy current displacement sensing
Linear Range	1.5 mm (60 mils)
Recommended Gap Setting	1.0 mm (40 mils)
Incremental Scale Factor	7.87 V/mm (200 mV/mil) +/- 12.5%
Output Voltage Range	Approximately -1 VDC to -13 VDC
Probe Tip Material	Polyphenylene sulfide (PPS)
Probe Body Material	AISI 304 stainless steel
Standard Target Material	AISI 4140 steel
Mounting Torque	11.3 N m (100 in lb)

Eddy Current Probe Scaling and Rotor Dynamics Monitoring

The 3300 NSv probe uses eddy-current sensing technology to measure shaft displacement relative to the probe tip. Therefore, the probe output follows a defined voltage displacement relationship with an incremental scale factor of 7.87 V/mm.

The system supports rotor dynamics analysis by providing continuous shaft vibration and position feedback. In addition, the narrow side-view probe structure reduces side-wall interference when installed near small diameter targets, counterbores, and restricted bearing housings.

Gap voltage validation remains a key installation procedure for accurate measurement. The 3300 NSv system typically verifies probe gap voltage near the -10 VDC target position to confirm correct operating clearance and signal linearity.

Frequently Asked Questions

Q: What measurement signals does the 330908-12-31-10-02-00 provide?
A: The probe provides proportional voltage output related to shaft displacement and supports vibration, radial position, and Keyphasor measurement when connected to a compatible 3300 NSv driver system.

Q: Can the probe operate without an extension cable?
A: Yes. This model includes a 1.0 m integrated cable length. The final system configuration depends on the required distance between the probe and monitoring electronics.

Q: What installation factors affect measurement accuracy?
A: Proper probe gap adjustment, target material compatibility, cable routing, and electrical shielding practices directly affect displacement measurement accuracy.

Field Installation Guidelines

Install the probe with the specified 3/8-24 UNF mounting thread and maintain proper mechanical alignment with the rotating shaft target surface.

Verify the probe gap voltage after mechanical installation. Adjust the probe position until the operating voltage falls within the intended range for the 3300 NSv system.

Route the coaxial cable away from high-current power conductors and strong electromagnetic interference sources. Maintain proper cable shielding practices and connect the shield according to the monitoring system grounding requirements.

Avoid excessive cable bending near the ClickLoc connector area. Confirm that the probe tip faces the target material directly and that the mounting structure does not introduce mechanical movement during operation.

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