Product Overview
When precise shaft vibration and position monitoring is critical, the Bently Nevada 330903-00-03-70-11-05 delivers reliable performance. This 3300 NSv Proximity Probe is designed for permanent installation in rotating machinery, providing accurate measurement of radial and axial shaft motion. With its 7.0-meter total length and M8X1 thread, this probe integrates seamlessly into existing monitoring systems. The 330903-00-03-70-11-05 offers enhanced chemical resistance compared to previous models, making it suitable for process compressor applications. It is mechanically and electrically interchangeable with Bently Nevada's earlier 3300 RAM probe, simplifying upgrades.
Technical Specifications
The 330903-00-03-70-11-05 boasts a linear range of 1.5 mm (60 mils), beginning at approximately 0.25 mm from the target. Its incremental scale factor is 7.87 V/mm (200 mV/mil), ensuring precise voltage output for displacement changes. The probe operates within a temperature range of -52°C to +177°C, suitable for harsh industrial environments. The probe tip is made of polyphenylene sulfide (PPS), and the case is constructed from AISI 304 stainless steel for durability.
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Probe dc Resistance: 5.9 ± 0.9 ohms (center to outer conductor)
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Extension Cable dc Resistance: Center conductor 0.220 Ω/m, shield 0.066 Ω/m
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Extension Cable Capacitance: 69.9 pF/m typical
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Field Wiring: 0.2 to 1.5 mm² (16-24 AWG), recommended three-conductor shielded triad cable, max length 305 m
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Frequency Response: 0 to 10 kHz: +0, -3 dB typical
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Minimum Bend Radius: 25.4 mm (1.0 in)
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Maximum Torque: 0.56 N•m (finger tight)
Industry Applications
The 330903-00-03-70-11-05 excels in critical rotating equipment monitoring. Use it for:
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Process Compressors: Its increased chemical resistance allows reliable operation in aggressive media, reducing downtime.
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Turbomachinery: Monitor shaft vibration and axial position to prevent catastrophic failures.
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Pumps and Motors: Detect early signs of misalignment or bearing wear, enabling predictive maintenance.
In each scenario, the probe's superior side-view characteristics provide accurate gap readings, even at close distances, ensuring dependable data for condition monitoring systems.
Installation & Setup Guidance
Proper installation is key to accurate measurements. Follow these guidelines:
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Mounting: Thread the probe into a mounting block or bracket using the M8X1 thread. Tighten finger tight; do not overtighten (max 0.56 N•m).
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Gap Setting: Set the recommended gap to 1.0 mm (40 mils) from the target surface. Use a feeler gauge or oscilloscope to verify.
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Wiring: Connect the FluidLoc cable to the extension cable, then to the Proximitor sensor. Ensure the three-conductor shielded triad cable is used for field wiring, with maximum length of 305 meters.
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Bend Radius: Avoid bending the probe cable tighter than 25.4 mm to prevent damage.
Maintenance & Reliability
Regular inspection extends the life of the 330903-00-03-70-11-05. Check the probe tip for contamination or damage, especially in harsh environments. Verify cable integrity and connector tightness periodically. The probe's robust construction—stainless steel case and PPS tip—resists corrosion and wear, minimizing maintenance needs. Its wide operating temperature range ensures stable performance in extreme conditions, reducing unplanned outages and associated costs.
Selection Guide & Purchasing Advice
Before purchasing, confirm your system's requirements: shaft diameter, target material, and mounting thread. The 330903-00-03-70-11-05 includes a miniature coaxial ClickLoc connector with connector protector and FluidLoc cable, ensuring secure connections. If you need pressure testing for your application, contact the manufacturer’s custom design department. For a reliable supply of genuine Bently Nevada parts, consider PLC Source PRO—we offer new, factory-packed units with a 12-month warranty.