Product Overview
The Bently Nevada 330172-00-20-90-02-00 is a precision 5mm proximity probe designed for reliable vibration and position monitoring in rotating machinery. This industrial automation module features a 1/4-28 UNF thread, a 2-inch overall case length, and a 9.0-meter armored cable with a miniature coaxial ClickLoc connector. Constructed with a polyphenylene sulfide (PPS) tip and an AISI 304 stainless steel case, the 330172-00-20-90-02-00 delivers consistent performance in harsh industrial environments.
Technical Specifications
Key specifications verified for the Bently Nevada 330172-00-20-90-02-00:
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Power Supply: Requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
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Probe DC Resistance: 9.87 ± 0.90 Ω from center conductor to outer conductor at 9.0 meters.
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Probe Cable: 75 Ω triaxial, fluoroethylene propylene (FEP) insulated, 9.0 meters (29.5 feet).
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Temperature Range: -35°C to +177°C (-31°F to +351°F).
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Weight: 0.323 kg.
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Probe Case Torque: Recommended 5.1 N·m (45 in·lb), maximum 7.3 N·m (65 in·lb).
Applications and Use Cases
The 330172-00-20-90-02-00 excels in critical machinery protection systems. Common applications include monitoring shaft vibration in turbines, compressors, and pumps. Its armored cable and robust construction make it suitable for environments with high magnetic fields up to 300 Gauss, as the probe’s magnetic field effect is minimal (0.0004 to 0.0045 mil pp/gauss depending on gap). This failure mode analysis addresses common issues like electrical noise and temperature extremes, ensuring reliable data for predictive maintenance.
Installation and Setup Guidance
For proper installation of the Bently Nevada 330172-00-20-90-02-00, ensure a #3 or larger tap drill is used when drilling a mounting hole for the 1/4-28 thread. The maximum thread engagement is 0.375 inches. Tighten the probe case to the recommended torque of 5.1 N·m (45 in·lb), not exceeding 7.3 N·m (65 in·lb). Maintain a minimum cable bend radius of 25.4 mm (1.0 in) to avoid damaging the FEP insulation. The connector-to-connector torque should be a maximum of 0.565 N·m (0.42 ft·lbf).
Maintenance and Reliability Tips
Regularly inspect the probe tip and cable for wear, especially near the connector. The PPS tip resists chemical attack, but avoid exposing the probe to temperatures below -34°C (-30°F) to prevent pressure seal failure. In high-vibration environments, recheck the probe case torque periodically. The 330172-00-20-90-02-00 is designed for long service life when operated within the specified temperature range.
Troubleshooting Common Issues
If the probe output is erratic, verify the power supply is within -17.5 to -26 Vdc. Operation above -23.5 Vdc may reduce linear range. Check for magnetic interference; the probe’s effect is minimal but can be verified using the provided gap-specific data (10, 50, 90 mil gaps). For high cable resistance exceeding 9.87 ± 0.90 Ω, inspect the connector for corrosion. Ensure the target material is AISI 4140 steel for accurate calibration.
Selection Guide and Purchasing Advice
When replacing an existing probe, confirm the unthreaded length (0 in for this model), overall case length (2 in), and total cable length (9.0 m). The 330172-00-20-90-02-00 uses a miniature coaxial ClickLoc connector. Order from PLC Source PRO for genuine Bently Nevada parts and fast shipping.