330171-00-40-05-02-00 | Bently Nevada 5mm Probe, 1/4-28 UNF

Product Overview

The Bently Nevada 330171-00-40-05-02-00 is a precision 5mm proximity probe from the 3300 series, designed for non-contact vibration and position measurement in critical rotating machinery. This probe features a 1/4-28 UNF thread and a 0.5 meter (1.6 feet) cable with a miniature coaxial ClickLoc connector, making it a direct replacement for many installed systems. Manufactured in the USA, this probe is engineered to deliver accurate, reliable data for predictive maintenance programs.

With a polyphenylene sulfide (PPS) probe tip and AISI 304 stainless steel case, the 330171-00-40-05-02-00 offers excellent durability in harsh industrial environments. The probe case thread is 1/4-28, with a maximum thread engagement of 0.375 inches, ensuring secure mounting. The unthreaded length is 0 inches and the overall case length is 4.0 inches, providing a compact footprint for tight installations.

Technical Specifications

Key specifications for the Bently Nevada 330171-00-40-05-02-00 include:

Probe Tip Material: Polyphenylene sulfide (PPS)

Probe Case Material: AISI 304 stainless steel (SST)

Thread Size: 1/4-28 UNF

Maximum Thread Engagement: 0.375 inches

Total Length: 0.5 meter (1.6 feet)

Connector: Miniature coaxial ClickLoc, standard cable

Weight: 0.323 kg

Power Requirement: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption

Output Resistance: 50 W

Probe DC Resistance: 7.45 ± 0.50 Ω (for 0.5m length)

Probe Temperature Range: -35°C to +177°C (-31°F to +351°F)

Cable Bend Radius: 25.4 mm (1.0 in) minimum

These specifications ensure reliable performance in demanding applications, with a sensitivity of less than 2 mV change in output voltage per volt change in input voltage.

Industry Applications

The 330171-00-40-05-02-00 is ideal for vibration monitoring on turbomachinery, compressors, pumps, and electric motors. Its 5mm sensing range and robust construction make it suitable for continuous operation in high-temperature environments up to 177°C. The probe's PPS tip and stainless steel case resist corrosion and wear, ensuring long service life even in harsh process conditions.

In petrochemical plants, this probe helps detect shaft vibration and axial position, enabling early warning of mechanical faults. In power generation, it supports turbine supervisory systems, protecting against catastrophic failures. The 0.5m cable length is convenient for installations where the sensor is close to the machine, reducing signal attenuation.

Installation and Setup

Proper installation is critical for accurate readings. When drilling and tapping a mounting hole for a 1/4-28 probe, a #3 or larger tap drill is recommended. Ensure the mounting surface is clean and free of debris. The probe case torque should be between 5.1 N·m (45 in·lb) recommended and 7.3 N·m (65 in·lb) maximum. For connector-to-connector torque, use the recommended torque of 0.565 N·m (0.42 ft·lbf) as a maximum.

Maintain a minimum cable bend radius of 25.4 mm (1.0 in) to prevent damage to the coaxial cable. After installation, verify the gap between the probe tip and the target surface, typically set to 1.27 mm (50 mils) for optimal linear range. Use a calibrated proximity system to confirm proper output voltage.

Maintenance and Reliability

Regular inspection of the probe and cable is recommended to ensure reliable operation. Check for physical damage, loose connections, and signs of wear. The probe's temperature range of -35°C to +177°C allows use in most industrial environments, but avoid exposing the probe to temperatures below -34°C (-30°F) to prevent premature failure of the pressure seal.

Periodically verify the DC resistance of the probe circuit (7.45 ± 0.50 Ω for the 0.5m length) to detect any degradation. Clean the probe tip gently with a soft cloth if contamination is suspected, but avoid abrasive materials. Following these practices extends the probe's lifespan and maintains measurement accuracy, reducing downtime and maintenance costs.

Selection and Purchasing Advice

When selecting a replacement probe, confirm the thread size (1/4-28 UNF), overall case length (4.0 in), and cable length (0.5m) match your existing setup. The 330171-00-40-05-02-00 uses a miniature coaxial ClickLoc connector, so verify compatibility with your extension cable. If your system requires a different cable length, Bently Nevada offers options of 1, 2, 5, or 9 meters.

BluePLC Industrial is a trusted supplier of genuine Bently Nevada parts. Contact us to verify current availability and lifecycle status before ordering. We can also provide guidance on compatible proximitor sensors and extension cables to complete your monitoring system.

For complete technical specifications for the 330171-00-40-05-02-00, please contact BluePLC Industrial.