330171-00-94-10-02-00 | Bently Nevada 5mm Probe 1/4-28 UNF

Product Overview

When rotating machinery vibration threatens uptime, the Bently Nevada 330171-00-94-10-02-00 delivers precise, dependable measurement. This 5mm proximity probe, part of the 3300 series, is engineered for permanent installation in critical turbomachinery, pumps, and compressors. Its rugged construction and proven eddy-current sensing technology provide the accurate shaft displacement data that condition monitoring systems rely on.

Designed for maintenance engineers who value reliability and ease of service, this probe simplifies installation and reduces the risk of measurement errors. The 330171-00-94-10-02-00 combines a compact form factor with robust materials, ensuring long-term stability in demanding industrial environments.

Technical Specifications

Every specification below is directly from the manufacturer's datasheet, ensuring accuracy for your engineering decisions.

Manufacturer: Bently Nevada

Product No.: 330171-00-94-10-02-00

Product Type: 330171 3300 5mm Probe, 1/4-28 UNF thread, without armor

Unthreaded Length Option: 00 = 0 in

Overall Case Length Option: 94 = 9.4 in

Total Length Option: 1 0 = 1.0 metre (3.3 feet)

Connector Option: 02 Miniature coaxial ClickLoc connector, standard cable

Agency Approval Option: 00 = Not Required

Probe Tip Material: Polyphenylene sulfide (PPS)

Probe Case Material: AISI 304 stainless steel (SST)

Weight: 0.323 Kg

Key Performance Parameters

Understanding the electrical and mechanical characteristics is essential for proper system integration.

Power Supply: Requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption. Operation at a more positive voltage than -23.5 Vdc can reduce linear range.

Supply Sensitivity: Less than 2 mV change in output voltage per volt change in input voltage.

Output Resistance: 50 W (ohm)

Probe DC Resistance: For 1.0 m probe length, resistance from center conductor to outer conductor is 7.59 ± 0.50 Ω.

Probe Temperature Range: -35°C to +177°C (-31°F to +351°F). Exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the pressure seal.

Thread Engagement: Maximum length of thread engagement is 0.375 in. When drilling and tapping a mounting hole for a 1/4-28 probe, a #3 or larger tap drill is recommended.

Probe Case Torque: 5.1 N·m (45 in·lb) recommended, 7.3 N·m (65 in·lb) maximum.

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

Minimum Cable Bend Radius: 25.4 mm (1.0 in).

Probe Cable: 75 Ω triaxial, fluoroethylene propylene (FEP) insulated, available in lengths of 0.5, 1, 2, 5, or 9 meters (1.6, 3.3, 16.4, or 29.5 feet).

Tensile Strength: 222 N (50 lbf) probe case to probe lead, and 222 N (50 lbf) probe lead to extension cable connectors.

Industry Applications

The 330171-00-94-10-02-00 is ideal for vibration monitoring on:

Turbomachinery: Steam turbines, gas turbines, and compressors where shaft vibration directly indicates mechanical health.

Pumps and Motors: Critical pumps and large electric motors where early detection of imbalance or misalignment prevents catastrophic failure.

Generators: Synchronous generators and exciters where rotor stability is paramount.

In each application, the probe's 5mm sensing range and high-temperature capability make it suitable for close-coupled installations where space is tight and conditions are harsh.

Installation & Setup Guidance

Proper installation is critical for accurate readings. Follow these guidelines based on the manufacturer's specifications:

Use a #3 or larger tap drill when creating the mounting hole for the 1/4-28 thread.

Ensure the thread engagement does not exceed 0.375 in to avoid mechanical interference.

Apply the recommended probe case torque of 5.1 N·m (45 in·lb) – do not exceed 7.3 N·m (65 in·lb).

Maintain the minimum cable bend radius of 25.4 mm (1.0 in) to prevent cable damage.

When connecting the ClickLoc connector, tighten to a maximum of 0.565 N·m (0.42 ft·lbf).

Verify the probe gap according to your monitoring system's requirements (typically 1.27 mm or 50 mils for calibration).

Maintenance & Reliability

Routine inspection of the probe and cable is essential for long-term reliability. Check for signs of wear, especially at the cable bend points and connector. The PPS tip is durable, but avoid impact damage. Periodically verify the probe's DC resistance to ensure the internal circuit is intact. Keep the probe tip clean and free of metallic debris. Following these simple steps will maximize the service life of your Bently Nevada probe.

Selection Guide & Purchasing Advice

When ordering the 330171-00-94-10-02-00, confirm the total length (1.0 metre) and connector type (ClickLoc) match your system's requirements. If you need a different cable length (0.5, 2, 5, or 9 meters) or an armored version, contact BluePLC Industrial for options. We stock genuine Bently Nevada parts and can advise on compatibility with your existing monitoring system. For complete technical specifications, please contact BluePLC Industrial.