Product Overview
The Bently Nevada 330904-08-15-70-11-05 is a precision 3300 NSv proximity probe designed for reliable vibration and position monitoring in critical rotating machinery. As part of the 3300 NSv series, this industrial automation module delivers accurate measurements in demanding environments. This model features an M8X1 threaded case with armor, an 80 mm unthreaded length, a 150 mm overall case length, and a 7.0-meter (23.0 feet) total length with a miniature coaxial ClickLoc connector and FluidLoc cable. It carries multiple agency approvals, ensuring compliance across global applications.
The 330904-08-15-70-11-05 probe and its extension cable are mechanically and electrically compatible with previous 3300 RAM proximity probes, offering a seamless upgrade path. The NSv probe provides increased chemical resistance, making it ideal for process compressor applications where exposure to aggressive media is common. Its side-view characteristics outperform the 3000-series 190 probe when gapping at the same distance from the target, ensuring consistent and reliable readings.
Key Technical Specifications
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Linear Range: 1.5 mm (60 mils), starting at approximately 0.25 mm (10 mils) from target, extending to 1.75 mm (70 mils) with output of approximately -1 to -13 Vdc.
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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) with +12.5%/-20% accuracy including interchangeability error, measured over 0.25 mm increments across the full linear range.
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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 with +0, -3 dB typical, supporting up to 305 meters (1000 feet) of field wiring.
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Probe DC Resistance: 5.9 ± 0.9 ohms for the 7.0-meter probe length.
Performance and Reliability
The 330904-08-15-70-11-05 offers exceptional accuracy and repeatability, with a linear range of 1.5 mm (60 mils) and a scale factor of 7.87 V/mm (200 mV/mil). Its frequency response extends to 10 kHz, ensuring it captures high-frequency vibrations essential for predictive maintenance. The probe is built to withstand harsh conditions, operating from -52°C to +177°C (-62°F to +351°F) and designed to seal differential pressure between the tip and case using a Viton O-ring.
With a probe case made of AISI 304 stainless steel and a probe tip of polyphenylene sulfide (PPS), this module resists corrosion and wear. The 75 Ω coaxial cable with FEP insulation provides excellent signal integrity, and the recommended bend radius of 25.4 mm (1.0 in) allows flexible routing without compromising performance.
Installation and Setup
Proper installation is critical for optimal performance. The probe should be mounted with finger-tight torque, and the maximum allowable torque is 0.56 N•m (5 in•lb) to avoid damaging the threads. For M8X1 probe cases, the maximum thread engagement is 12 mm, and the connector-to-connector torque should be between 5.1 N•m (45 in•lb) recommended and 7.3 N•m (65 in•lb) maximum. Ensure the target surface is clean and flat, with a minimum diameter of 8.9 mm (0.35 in) for flat targets; a recommended minimum of 13 mm (0.5 in) diameter is advised for consistent scale factor.
Field wiring should use a three-conductor shielded triad cable with conductors sized 0.2 to 1.5 mm² (16 to 24 AWG) or 0.25 to 0.75 mm² (18 to 23 AWG) with ferrules. The maximum distance between the 3300 XL NSv Proximitor Sensor and the monitor is 305 meters (1000 feet). Refer to the frequency response graphs (Figures 16 and 17) for signal rolloff at high frequencies when using longer wiring lengths.
Applications
This proximity probe is widely used in:
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Process Compressors: The increased chemical resistance of the 3300 NSv probe allows reliable operation in environments with aggressive process media.
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Turbomachinery: Monitoring shaft vibration and axial position in steam turbines, gas turbines, and compressors to prevent catastrophic failures.
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Generators and Pumps: Ensuring smooth operation and early detection of bearing wear or misalignment in critical rotating equipment.
By integrating the 330904-08-15-70-11-05 into your condition monitoring system, you gain actionable data to optimize maintenance schedules and reduce unplanned downtime.
Maintenance and Longevity
Routine inspection of the probe and cable is essential to maintain accuracy. Check for physical damage, such as cuts or abrasions on the cable, and ensure the probe tip is free of contaminants. The probe’s PPS tip and stainless steel case resist corrosion, but periodic cleaning with a soft cloth is recommended. Avoid exceeding the operating temperature range, and verify that the mounting torque remains within specified limits. With proper care, this module delivers years of reliable service, minimizing total cost of ownership.
Selection Guide
When selecting a replacement or new installation, verify the exact part number 330904-08-15-70-11-05 to ensure compatibility with your existing system. Confirm the probe length, connector type, and agency approvals match your requirements. For technical assistance or to place an order, PLC Source PRO offers genuine Bently Nevada parts with factory warranty and fast shipping. Trust PLC Source PRO for authentic industrial automation components that keep your operations running smoothly.