Product Overview
The Bently Nevada 330171-00-20-90-02-00 is a precision 5mm proximity probe designed for continuous vibration and position monitoring in rotating machinery. Part of the 3300 series, this probe features a 1/4-28 UNF thread, a 9.0-meter cable with a miniature coaxial ClickLoc connector, and a polyphenylene sulfide (PPS) tip. It operates reliably under demanding industrial conditions, providing accurate displacement measurements essential for predictive maintenance and machine protection.
Technical Specifications
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Power Supply: Requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption. Operation at voltages more positive than -23.5 Vdc can reduce linear range.
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Sensitivity: Less than 2 mV change in output voltage per volt change in input voltage.
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Output Resistance: 50 W (ohms).
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Probe DC Resistance: 9.87 +- 0.90 ohms for 9.0m probe length.
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Probe Temperature Range: -35°C to +177°C (-31°F to +351°F). Exposing below -34°C may cause premature pressure seal failure.
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Probe Cable: 75 ohm triaxial, FEP insulated, available in lengths 0.5, 1, 2, 5, or 9 meters.
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Thread: 1/4-28 with maximum engagement of 0.375 in. Use #3 or larger tap drill.
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Weight: 0.323 kg.
Industry Applications
The Bently Nevada 330171-00-20-90-02-00 is widely used in critical rotating equipment such as steam turbines, centrifugal compressors, pumps, and electric motors. It measures shaft vibration and position relative to the bearing housing, enabling early detection of imbalance, misalignment, or bearing wear. In power generation and petrochemical plants, this probe helps prevent unplanned downtime and catastrophic failures.
Installation & Setup Guidance
When installing the 330171-00-20-90-02-00, drill and tap a mounting hole for the 1/4-28 thread using a #3 or larger tap drill. Ensure the probe is not overtightened: recommended torque is 5.1 N·m (45 in·lb), maximum 7.3 N·m (65 in·lb). For the ClickLoc connector, apply a maximum connector-to-connector torque of 0.565 N·m (0.42 ft·lbf). The minimum cable bend radius is 25.4 mm (1.0 in) to avoid damaging the internal conductors. Verify the probe gap at 1.27 mm (50 mils) for optimal linearity when used with a -24 Vdc supply and AISI 4140 steel target.
Maintenance & Reliability
Regularly inspect the probe tip for contamination or damage. The PPS tip resists chemical attack, but high temperatures beyond +177°C can degrade performance. Avoid exposure to strong magnetic fields above 300 Gauss, as they may induce output voltage variations. For the 5-meter system, the 60 Hz magnetic field effect at 10 mil gap is 0.0119 mV (pp/gauss) for the proximitor sensor. Check cable integrity: the probe lead has a tensile strength of 222 N (50 lbf) at connections. Periodically verify the probe’s DC resistance (9.87 ± 0.90 ohm) to detect cable degradation.
Selection Guide & Purchasing Advice
Before ordering, confirm your system requires the 330171-00-20-90-02-00 configuration: unthreaded length 0 in, overall case length 2 in, total length 9.0 meters, miniature coaxial ClickLoc connector, and no agency approval. Ensure your extension cable matches the 75 ohm triaxial type. For reliable sourcing, PLC Source PRO supplies genuine Bently Nevada 330171-00-20-90-02-00 probes with full traceability. Contact our team for assistance with compatible proximitors and cables.