Description

Bently Nevada 330904-02-20-05-01-00 3300 NSv Proximity Probe

The Bently Nevada 330904-02-20-05-01-00, also cataloged as the 330904 Proximity Probe, operates as a dedicated hardware component for shaft displacement measurement within the 3300 NSv Proximity Transducer System. The probe uses eddy-current sensing technology to provide non-contact radial vibration, axial position, and speed measurement signals.

Hardware Specifications

Parameter	Specification
Model	330904-02-20-05-01-00
Brand	Bently Nevada
Product Type	3300 NSv Proximity Probe
System Compatibility	3300 NSv Proximity Transducer System
Origin	USA
Dimensions	M8 x 1 thread, 20 mm unthreaded length, 200 mm case length, 0.5 m cable length
Operating Temp	-52 deg C to +177 deg C
Storage Temp	-52 deg C to +177 deg C
Power Consumption	Passive probe element; excitation supplied by Proximitor sensor
Measurement Range	0.25 mm to 1.75 mm (10 mils to 70 mils)
Average Scale Factor	7.87 V/mm (200 mV/mil), +/-20%
Output Signal Range	Approximately -1 VDC to -13 VDC
Frequency Response	0 Hz to 10 kHz typical
Probe Thread Type	M8 x 1 metric thread
Probe Tip Material	PPS polymer
Probe Case Material	AISI 304 stainless steel
Cable Type	75 ohm coaxial cable, FEP insulated, stainless steel armor
Connector Type	Miniature coaxial ClickLoc gold-plated brass connector
Recommended Gap Setting	1.0 mm (40 mils)
Center Conductor Resistance	4.0 +/- 0.5 ohm for 0.5 m cable
Installation Torque	5.1 N m maximum for probe case; 0.56 N m maximum for tip

Eddy-Current Probe Scaling and Rotor Dynamics Monitoring

The 330904 probe applies eddy-current measurement principles to convert shaft displacement into proportional electrical signals. Therefore, the Proximitor interface can evaluate rotor movement using the defined scale factor of 200 mV/mil. The probe supports rotor dynamics analysis by providing displacement data required for vibration waveform, shaft position, and machine condition monitoring.

The probe operates with a recommended gap voltage adjustment near -10 VDC when connected to compatible Bently Nevada Proximitor modules. This gap voltage validation process confirms probe positioning, signal linearity, and measurement range before machine operation.

The miniature probe construction reduces installation limitations in restricted mounting areas. In addition, the armored cable design improves mechanical protection against external installation conditions while maintaining signal transmission characteristics.

Frequently Asked Questions

Q: What measurement signals does the Bently Nevada 330904-02-20-05-01-00 provide?
A: The probe provides non-contact displacement signals for radial vibration, axial position, and speed measurement applications through an eddy-current sensing circuit.

Q: Does the probe require an external power supply connection?
A: No. The probe operates as part of the 3300 NSv Proximity Transducer System and receives excitation from the connected Proximitor module.

Q: What installation factors affect measurement accuracy?
A: Correct probe gap adjustment, proper thread installation, cable routing, and shielding practices affect signal stability and measurement accuracy.

Field Installation Guidelines

Install the probe with the specified M8 x 1 mounting thread and maintain mechanical alignment between the probe tip and the monitored shaft surface.

Set the initial probe gap near 1.0 mm before system calibration. Verify the Proximitor gap voltage output and confirm the operating point remains within the linear measurement range.

Route the armored coaxial cable away from high-current power conductors and strong electromagnetic interference sources. Avoid sharp cable bends below the specified minimum bend radius.

Connect the ClickLoc connector securely and verify that the connector protector remains installed where required. Use proper shield grounding practices according to the monitoring system installation manual.

After installation, perform gap voltage validation and signal verification before placing the rotating equipment into service.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems