Product Overview
When process compressors demand reliable vibration monitoring under harsh chemical exposure, the Bently Nevada 330904-08-15-10-12-05 delivers. This 3300 NSv Proximity Probe is a precision eddy-current sensor designed for shaft vibration and position measurement. It features an M8x1 threaded case with armor, an 80 mm unthreaded length, a 150 mm overall case length, and a 1.0 meter total length. The miniature coaxial ClickLoc connector with FluidLoc cable ensures secure, quick installation. This probe is mechanically and electrically interchangeable with the previous 3300 RAM probe, offering an easy upgrade path.
Technical Specifications
The 330904-08-15-10-12-05 is built to rigorous standards. Key parameters include:
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Probe DC Resistance: 4.2 Ω ± 0.5 Ω (for 1.0 m length)
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Linear Range: 1.5 mm (60 mils), from 0.25 to 1.75 mm (10 to 70 mils) from target
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Recommended Gap Setting: 1.0 mm (40 mils)
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Incremental Scale Factor (ISF): 7.87 V/mm (200 mV/mil) +12.5%/-20% including interchangeability error
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Deviation from Best Fit Straight Line (DSL): Less than ±0.06 mm (±2.3 mils)
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Frequency Response: 0 to 10 kHz: +0, -3 dB typical, with up to 305 meters of field wiring
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Target Size (flat target): Minimum 8.9 mm (0.35 in) diameter; recommended minimum 13 mm (0.5 in) diameter
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Probe Tip Material: Polyphenylene sulfide (PPS)
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Probe Case Material: AISI 304 stainless steel (SST)
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Probe Cable: 75 Ω coaxial, FEP insulated, available in 0.5, 1, 5, or 7 meters
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Operating Temperature: -52°C to +177°C (-62°F to +351°F)
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Storage Temperature: -52°C to +177°C (-62°F to +351°F)
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Minimum Bend Radius: 25.4 mm (1.0 in) with or without SST armor
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Maximum Torque: 0.56 N•m (5 in•lb) recommended finger tight
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Connector-to-Connector Torque: Maximum rated 7.3 N•m (65 in•lb), recommended 5.1 N•m (45 in•lb)
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Probe Case Thread: M8x1, maximum thread engagement 12 mm
Industry Applications
The 330904-08-15-10-12-05 excels in process compressor applications where chemical resistance is critical. Its PPS tip and stainless steel case withstand aggressive media, while the Viton O-ring seals differential pressure between probe tip and case. Use it for radial vibration monitoring on turbomachinery, axial position measurement on thrust bearings, and eccentricity monitoring on large rotating shafts. The side-view characteristics outperform previous 3000-series 190 probes, providing more accurate gap measurements. This probe is a direct replacement for older 3300 RAM probes, simplifying retrofits.
Installation & Setup Guidance
Proper installation ensures accurate readings. Follow these steps:
- Mount the probe using the M8x1 thread; apply finger tight torque, then tighten to a maximum of 0.56 N•m (5 in•lb) to avoid damaging the threads.
- Maintain a minimum bend radius of 25.4 mm (1.0 in) for the probe cable, whether or not armor is used.
- Set the initial gap to 1.0 mm (40 mils) from the target surface. Use a feeler gauge or oscilloscope to verify.
- Connect the ClickLoc connector to the extension cable; ensure a secure click is heard.
- Field wiring from the Proximitor to the monitor should use three-conductor shielded triad cable, 0.2 to 1.5 mm² (16 to 24 AWG), with a maximum length of 305 meters (1,000 feet). For lengths beyond this, refer to frequency response graphs for signal rolloff.
Maintenance & Reliability
Routine inspection of the probe tip for contamination or damage is recommended. The PPS tip resists chemicals, but abrasive particles can cause wear. Check the cable for cuts or kinks, especially near the connector. The Viton O-ring maintains pressure integrity; if the probe is exposed to high differential pressures, consider pressure testing before installation. The operating temperature range of -52°C to +177°C allows use in extreme environments, but thermal cycling may affect probe performance—verify gap settings periodically. With proper care, the 330904-08-15-10-12-05 provides years of reliable service, reducing downtime and maintenance costs.
Selection Guide & Purchasing Advice
Before purchasing, verify your system's requirements: shaft diameter (for axial measurement), target size, cable length, and connector type. The 330904-08-15-10-12-05 includes a 1.0 meter total length and miniature coaxial ClickLoc connector—ensure compatibility with your extension cable and Proximitor. For applications requiring agency approvals, this model carries multiple approvals (option 05). PLC Source PRO offers this genuine Bently Nevada probe in new, original factory packing with a 12-month warranty. Order with confidence for your critical machinery protection needs.