330101-00-12-50-01-05 | Bently Nevada 5m 8mm Probe

Introduction to the 330101-00-12-50-01-05

When machine vibration threatens uptime, the 330101-00-12-50-01-05 from Bently Nevada provides the reliable measurement you need. This 3300 XL 8 mm probe uses a 3/8-24 UNF thread for secure mounting. It is built for demanding industrial environments where accuracy and durability are non-negotiable.

This probe is part of the trusted 3300 XL series, known for robust performance in rotating machinery monitoring. With a total length of 5.0 meters (16.4 feet), it offers flexibility in installation. The probe is made in the U.S.A. and carries CSA, ATEX, and IECEx approvals, making it suitable for hazardous areas.

Key Features and Technical Specifications

The 330101-00-12-50-01-05 is engineered with several standout features that address common pain points in vibration monitoring.

• Robust Tip Design: A patented TipLoc molding method creates a stronger bond between the probe tip and body, reducing the risk of tip separation.
• High Pull Strength: The CableLoc design provides 330 N (75 lbf) pull strength, ensuring the cable stays attached even under stress.
• Linear Range: The probe offers a 2 mm (80 mils) linear range, starting at approximately 0.25 mm (10 mils) from the target, with a usable span from 0.25 to 2.3 mm (10 to 90 mils).
• Incremental Scale Factor: Standard 5-meter systems deliver 7.87 V/mm (200 mV/mil) ±5% including interchangeability error over the linear range at 0°C to +45°C.
• Temperature Tolerance: The standard probe operates from -52°C to +177°C (-62°F to +350°F), with extended range options available.
• Pressure Seal: A Viton® O-ring seals differential pressure between the tip and case, preventing leakage.

These features combine to provide accurate, repeatable measurements that help you detect issues early and avoid unplanned downtime.

Applications and Use Cases

The 330101-00-12-50-01-05 is ideal for radial vibration monitoring on rotating equipment such as turbines, compressors, and pumps. Its 8 mm probe size offers a thicker encapsulation of the coil in molded PPS plastic, making it more rugged against physical abuse. This robustness is critical in harsh environments where probes may be exposed to impact or vibration.

For example, in a steam turbine application, the probe’s stable linear range and temperature tolerance ensure reliable readings even when the machine operates near its thermal limits. The optional FluidLoc cable option prevents oil leakage through the cable interior, which is a common issue in lubricated machinery. By using this probe, you can reduce false alarms and improve maintenance planning.

Installation and Setup

Proper installation is key to getting accurate measurements from the 330101-00-12-50-01-05. The probe features a 3/8-24 UNF thread with a maximum thread engagement of 0.563 inches. Ensure the mounting surface is clean and the probe is torqued to the recommended specification (refer to the manual).

The probe connects via a miniature coaxial ClickLoc connector with a connector protector. For field wiring, use a 3-conductor shielded triad cable with tinned conductors, sized 0.2 to 1.5 mm² (16 to 24 AWG). The maximum field wiring length between the 3300 XL Proximitor Sensor and the monitor is 305 meters (1,000 feet). For longer runs, check the frequency response graphs in the datasheet to account for signal rolloff at high frequencies.

Set the recommended gap for radial vibration to -9 Vdc, which corresponds to approximately 1.27 mm (50 mils). This ensures you operate within the linear range for best accuracy.

Maintenance and Reliability

Regular inspection is essential to maintain the performance of the 330101-00-12-50-01-05. Periodically check the probe tip for wear or damage, and verify that the cable is securely attached. The probe’s robust design—with a stainless steel case (AISI 303 or 304) and PPS tip—resists corrosion and physical stress, extending service life.

Environmental factors such as temperature and humidity can affect performance. The probe is tested for less than 3% change in Average Scale Factor when exposed to 93% humidity for up to 56 days per IEC 68-2-3. For extreme temperatures, consider the extended temperature range option. Always follow the manufacturer’s manual for specific maintenance procedures.

Compatibility and Integration

The 330101-00-12-50-01-05 is designed to work with Bently Nevada 3300 XL Proximitor Sensors and monitoring systems. It is compatible with standard 5-meter systems, and the probe’s DC resistance is 8.73 ± 0.50 ohms from center conductor to outer conductor. The extension cable capacitance is 69.9 pF/m (21.3 pF/ft) typical.

For integration, ensure your monitoring system supports the 7.87 V/mm (200 mV/mil) scale factor. The probe’s approvals (CSA, ATEX, IECEx) allow use in hazardous areas, but verify compatibility with your specific system configuration.

Troubleshooting and Common Issues

If you encounter erratic readings, first check the gap voltage. The recommended setting is -9 Vdc; deviation from this may push the probe out of its linear range. Also inspect the cable for damage or loose connections at the ClickLoc connector.

Another common issue is oil ingress through the cable. The optional FluidLoc option prevents this, but if you have a standard cable, ensure the connector protector is intact. If readings drift over time, verify that the probe tip is not worn and that the target surface is clean.

For persistent problems, consult the Bently Nevada documentation or contact Petro Auto Tech for technical support.

FAQ about the 330101-00-12-50-01-05

Q: What is the linear range of the 330101-00-12-50-01-05?

A: The linear range is 2 mm (80 mils), starting at approximately 0.25 mm (10 mils) from the target, spanning from 0.25 to 2.3 mm (10 to 90 mils).

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

A: Set the gap to -9 Vdc, which is approximately 1.27 mm (50 mils).

Q: What is the operating temperature range of the standard probe?

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

Q: What approvals does the 330101-00-12-50-01-05 carry?

A: It carries CSA, ATEX, and IECEx approvals, making it suitable for hazardous area installations.

Q: What is the maximum field wiring length?

A: The maximum length between the Proximitor Sensor and monitor is 305 meters (1,000 feet).

Product Support and Availability

The 330101-00-12-50-01-05 is available through Petro Auto Tech, your trusted source for industrial automation parts. We maintain inventory to ensure fast delivery. For lifecycle status or additional technical details, please contact Petro Auto Tech before ordering.