330101-00-12-20-12-CN | Bently Nevada 8 mm Probe 2.0 m

Introduction to the 330101-00-12-20-12-CN

When machine reliability is non-negotiable, the 330101-00-12-20-12-CN from Bently Nevada delivers the precision you need. This 3300 XL 8 mm probe is engineered for eddy-current vibration monitoring, providing accurate shaft displacement measurements in rotating machinery.

With a total length of 2.0 meters (6.6 feet) and a miniature coaxial ClickLoc connector, this probe is ready for demanding industrial environments. The 8 mm design offers a thicker encapsulation of the probe coil in molded PPS plastic, resulting in a more rugged and robust probe.

Key Features and Technical Specifications

• Probe Type: 3300 XL 8 mm probe with 3/8-24 UNF thread
• Unthreaded Length: 0.0 inches
• Overall Case Length: 1.2 inches
• Total Length: 2.0 meters (6.6 feet)
• Connector: Miniature coaxial ClickLoc, FluidLoc cable
• Nominal Probe DC Resistance: 7.88 ± 0.50 ohms (for 2.0 m probe)
• Extension Cable Capacitance: 69.9 pF/m (21.3 pF/ft) typical
• Linear Range: 2 mm (80 mils), starting at approximately 0.25 mm (10 mils) from target
• Incremental Scale Factor (ISF): 7.87 V/mm (200 mV/mil) ± 5% (standard 5 or 1 meter system)
• Probe Tip Material: Polyphenylene sulfide (PPS)
• Probe Case Material: AISI 303 or 304 stainless steel
• Operating Temperature: -52°C to +177°C (-62°F to +350°F) for standard probe

The patented TipLoc molding method ensures a robust bond between the probe tip and body, while the CableLoc design provides 330 N (75 lbf) pull strength for secure cable attachment.

Applications and Use Cases

This probe is ideal for radial vibration monitoring on turbines, compressors, pumps, and other rotating equipment. Its 2 mm linear range and high sensitivity make it suitable for detecting shaft vibration and displacement in real time.

For example, in a steam turbine train, the 330101-00-12-20-12-CN can be mounted to continuously monitor bearing vibration, helping operators identify imbalance or misalignment before they lead to costly downtime.

Installation and Setup

Proper installation is critical for accurate readings. The probe uses a 3/8-24 UNF thread for mounting. Ensure the target surface is clean and that the gap is set to the recommended -9 Vdc (approximately 1.27 mm or 50 mils) for radial vibration measurements.

Field wiring should use 0.2 to 1.5 mm² (16 to 24 AWG) three-conductor shielded triad cable, with a maximum length of 305 meters (1,000 feet) between the Proximitor and monitor. Refer to the frequency response graphs for signal rolloff at high frequencies when using longer wiring.

Maintenance and Reliability

The 330101-00-12-20-12-CN is built for longevity. The PPS probe tip and stainless steel case resist physical abuse and harsh environments. The FluidLoc cable option prevents oil leakage through the cable interior, enhancing reliability in lubricated machinery.

Regular inspection of the probe and cable for damage is recommended. Avoid exposing the probe to temperatures below -34°C (-30°F) to prevent premature failure of the pressure seal.

Compatibility and Integration

This probe is designed to work with Bently Nevada 3300 XL Proximitor sensors and monitoring systems. The miniature coaxial ClickLoc connector ensures a secure, reliable connection. For detailed compatibility information, refer to the official Bently Nevada documentation or contact Petro Auto Tech.

Frequently Asked Questions

Q: What is the linear range of the 330101-00-12-20-12-CN?

A: The linear range is 2 mm (80 mils), beginning at approximately 0.25 mm (10 mils) from the target.

Q: What is the recommended gap setting for radial vibration?

A: The recommended gap setting is -9 Vdc, approximately 1.27 mm (50 mils).

Q: What is the operating temperature range for this probe?

A: The standard probe operates from -52°C to +177°C (-62°F to +350°F).

Q: What is the incremental scale factor (ISF)?

A: The ISF is 7.87 V/mm (200 mV/mil) ± 5% for standard 5 or 1 meter systems.

Product Support and Availability

The 330101-00-12-20-12-CN is available from Petro Auto Tech. Contact us for current availability and lead times. Our team can assist with technical questions and ordering.