Engineered specifically for critical rotating machinery protection, the Bently Nevada 330703-000-090-50-02-00 proximity probe delivers high-precision eddy current measurement to track turbine shaft vibration and position down to the micron. This 11mm metric system provides an extended linear range over standard 8mm probes, allowing it to absorb greater thermal growth and structural movement while preventing costly catastrophic machine damage. It is the global standard for heavy-duty power generation turbines, large industrial compressors, and high-speed fluid pumps operating in harsh, oily environments.
| Parameter | Technical Rating | Practical Value for Buyers & Installers |
|---|---|---|
| Linear Measuring Range | 4.0 mm (160 mils) | Prevents out-of-range sensor clipping: Offers double the linear range of an 8mm probe, making it ideal for large turbines with significant thermal expansion and shifting baselines. |
| Part Number Breakdown | 330703-000-090-50-02-00 | Exact drop-in engineering match: Specifies an unthreaded smooth barrel length (-000), a 90mm threaded barrel (-090), a 5.0-meter total system length (-50), a miniature click-lock coaxial connector (-02), and standard dynamic approval (-00). |
| Material Construction | Polyphenylene Sulfide (PPS) tip & AISI 304/316 Stainless Steel | Extreme environmental survivability: Fully sealed against hot lubricating oils, chemical vapors, and high-pressure steam leaks inside the bearing housing. |
“When configuring critical TSI (Turbine Supervisory Instrumentation) loops, paying close attention to the system length option code is paramount. The -50 in this 330703 model dictates a 5.0-meter system length. You must pair this probe only with a matching 5.0-meter 3300 XL Proximitor sensor and bypass any external extension cables. Mixing a 5.0-meter probe with a 9.0-meter Proximitor—or adding a separate cable—will skew the calibration curve and trigger false high-vibration alarms or dangerous failure to trip.”
— Principal Machinery Diagnostics Engineer
Q: Can I use this 11mm probe with my existing 8mm 3300 XL Proximitor sensors to save upgrade costs?
A: No. The 11mm probe tip changes the electrical field characteristics significantly. It must be connected to a dedicated 3300 XL 11mm Proximitor Sensor (e.g., 330780 series). Forcing an 11mm probe into an 8mm sensor loop will result in highly inaccurate voltage-to-displacement scaling and invalidate your API 670 machinery protection compliance.
Q: What is the benefit of the FluidLoc coaxial connector option (-02) on this cable?
A: The -02 option code provides the miniature coaxial connector without a locking sleeve but with built-in moisture resistance. This configuration is engineered to pass cleanly through tight internal conduit bends and specialized oil-seal bulkheads without binding, while preventing oil from wicking through the core of the cable.
Q: Does this metric probe configuration require specific calibration for different shaft metals?
A: By default, Bently Nevada 3300 XL probes are factory-calibrated using AISI 4140 steel as the target material. If your turbine rotor or thrust collar is constructed from a specialized alloy (such as high-chromium stainless steel or monel), the voltage scale factor will shift. In these cases, custom calibration charts must be calculated or applied directly within your monitoring rack.
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