330171-04-12-05-02-CN | Bently Nevada 5mm Probe 1/4-28 UNF

Product Overview

When rotating machinery begins to vibrate abnormally, the 330171-04-12-05-02-CN from Bently Nevada provides the precise measurement you need to catch problems early. This 5mm proximity probe is part of the trusted 3300 series, engineered for non-contact vibration and position monitoring in critical industrial assets. With a 1/4-28 UNF thread and a robust stainless steel case, this probe delivers reliable performance in demanding environments.

The 330171-04-12-05-02-CN is designed for maintenance engineers who prioritize uptime and accuracy. Its unthreaded length of 0.4 inches and overall case length of 1.2 inches allow for flexible mounting configurations. The total length of 0.5 meters (1.6 feet) provides ample reach for typical installations, while the miniature coaxial ClickLoc connector ensures a secure and quick connection. This probe is manufactured in the U.S.A., reflecting Bently Nevada's commitment to quality.

Technical Specifications

Probe Tip Material: Polyphenylene sulfide (PPS) – offers excellent chemical resistance and dimensional stability.

Probe Case Material: AISI 304 stainless steel (SST) – provides corrosion resistance and mechanical strength.

Thread Size: 1/4-28 UNF – a standard fine thread for secure mounting.

Maximum Thread Engagement: 0.375 inches – ensures proper installation depth.

Weight: 0.323 kg – lightweight for easy handling.

Cable Length: 0.5 meters (1.6 feet) – standard length for this configuration.

Connector: Miniature coaxial ClickLoc – provides a reliable, tool-free connection.

Probe Temperature Range: -35°C to +177°C (-31°F to +351°F) – suitable for a wide range of operating conditions.

Probe DC Resistance: 7.45 ± 0.50 Ω (for 0.5m cable) – ensures signal integrity.

Tensile Strength: 222 N (50 lbf) – robust pull strength between probe case and lead.

Recommended Probe Case Torque: 5.1 N·m (45 in·lb) – for proper mounting without damage.

Maximum Connector-to-Connector Torque: 0.565 N·m (0.42 ft·lbf) – protects connector integrity.

Minimum Cable Bend Radius: 25.4 mm (1.0 in) – prevents cable damage during routing.

These specifications confirm that the 330171-04-12-05-02-CN is built for accuracy and durability. The PPS tip and SST case withstand harsh conditions, while the precise electrical characteristics ensure reliable data transmission to your monitoring system.

Industry Applications

This probe excels in a variety of rotating machinery monitoring applications:

Turbines and Compressors: Detects shaft vibration and axial position, helping prevent catastrophic failures.

Pumps and Motors: Monitors bearing health and alignment, reducing unplanned downtime.

Generators and Gearboxes: Provides critical data for predictive maintenance programs.

In each scenario, the 330171-04-12-05-02-CN delivers consistent, repeatable measurements. Its compact design and standard thread make it easy to retrofit into existing monitoring systems, minimizing installation time and cost.

Installation & Setup Guidance

Proper installation is key to accurate readings. Follow these guidelines:

Drill and tap a mounting hole using a #3 or larger tap drill for the 1/4-28 thread. Ensure the hole depth allows for the recommended thread engagement of 0.375 inches.

Clean the mounting area to remove any debris or oil that could affect the probe's seating.

Thread the probe into the hole by hand, then use a torque wrench to tighten to the recommended 5.1 N·m (45 in·lb). Do not exceed 7.3 N·m (65 in·lb) maximum torque.

Connect the cable using the ClickLoc connector, ensuring a firm push until it clicks. Avoid bending the cable beyond its minimum bend radius of 25.4 mm (1.0 in).

Set the gap according to your system's requirements (typically 1.27 mm or 50 mils for standard calibration). Use a feeler gauge or the system's calibration procedure.

Always verify the probe's output with a known target before finalizing the installation. This ensures the system is calibrated correctly for your specific machinery.

Maintenance & Reliability

Routine inspection of the probe and cable is essential for long-term reliability. Check for:

Physical damage to the probe tip or case, such as scratches or dents.

Cable wear at stress points, especially near the connector and bend areas.

Loose connections – ensure the ClickLoc connector remains securely seated.

Periodically verify the probe's resistance (7.45 ± 0.50 Ω) to detect any internal damage. If readings drift, recalibrate the system or replace the probe as needed. The robust construction of the 330171-04-12-05-02-CN minimizes maintenance frequency, but proactive checks help avoid unexpected failures.

Compatibility & Integration

This probe is designed to work with Bently Nevada's 3300 XL proximity transducer systems. It connects directly to compatible Proximitor sensors and extension cables, ensuring seamless integration into your existing vibration monitoring setup. The standard 1/4-28 thread and ClickLoc connector make it a drop-in replacement for many legacy probes.

Before ordering, verify that your monitoring system supports the 5mm probe format and that the cable length (0.5m) meets your routing needs. For longer runs, consider extension cables (available in 1, 2, 5, or 9 meters) to maintain signal quality.

Buying Guide & Purchasing Advice

When purchasing the 330171-04-12-05-02-CN, consider the following:

Confirm the part number matches your system requirements – this specific configuration includes a 0.5m cable and ClickLoc connector.

Check the thread type – 1/4-28 UNF is standard, but verify your mounting hole is compatible.

Assess environmental conditions – the probe operates from -35°C to +177°C, so ensure it suits your site's temperature range.

Order from a trusted supplier like BluePLC Industrial to guarantee authentic Bently Nevada parts and reliable support.

BluePLC Industrial stocks this probe and offers competitive pricing for maintenance and repair needs. Contact our team for availability and lead times.

Please verify current lifecycle status and availability with BluePLC Industrial before ordering.