The Bently Nevada 330903-00-04-70-11-00 is a high-performance 3300 NSv proximity probe designed for precise vibration and position monitoring in critical rotating machinery. This industrial automation module delivers reliable, repeatable measurements in demanding process environments, offering enhanced chemical resistance and superior side-view characteristics compared to earlier probe designs.
Product Overview
When machinery reliability is non-negotiable, the 330903-00-04-70-11-00 provides the accurate displacement data your monitoring system needs. This 3300 NSv probe features an M8x1 threaded case without armor, a 40 mm overall case length, and a 7.0-meter (23.0 feet) total length. Equipped with a miniature coaxial ClickLoc connector with connector protector and FluidLoc cable, this model ensures secure, stable connections in industrial settings. The probe is mechanically and electrically interchangeable with Bently Nevada's previous 3300 RAM proximity probe, simplifying upgrades.
Technical Specifications
Every parameter of the 330903-00-04-70-11-00 is engineered for precision and durability:
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Linear Range: 1.5 mm (60 mils), starting at approximately 0.25 mm (10 mils) from the target, extending to 1.75 mm (10 to 70 mils).
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Incremental Scale Factor (ISF): 7.87 V/mm (200 mV/mil), with +12.5%/-20% interchangeability error over the linear range.
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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 (center conductor to outer conductor) at 7.0 meters.
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Operating Temperature: -52°C to +177°C (-62°F to +351°F).
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Probe Tip Material: Polyphenylene sulfide (PPS).
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Probe Case Material: AISI 304 stainless steel.
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Probe Cable: 75 Ω coaxial, FEP insulated, available in 0.5, 1, 5, or 7 meters.
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Recommended Torque: Finger tight; maximum 0.56 N•m (5 in•lb).
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Connector-to-Connector Torque: Maximum 7.3 N•m (65 in•lb), recommended 5.1 N•m (45 in•lb) for M8x1 cases.
Industry Applications
This proximity probe excels in process compressor applications where chemical resistance is critical. Its increased chemical resistance over the 3300 RAM probe allows reliable operation in harsh media. The 330903-00-04-70-11-00 is ideal for:
- Vibration monitoring on centrifugal and reciprocating compressors
- Shaft radial and axial position measurement in turbines and pumps
- Dynamic clearance monitoring in gearboxes and large motors
Installation & Setup Guidance
Proper installation ensures accurate readings. The probe threads into a mounting hole using an M8x1 thread, with a maximum engagement length of 12 mm. Use only finger-tight torque initially, then apply the specified maximum torque (0.56 N•m) to secure the case without damaging the threads. Maintain a minimum bend radius of 25.4 mm (1.0 in) for the cable to prevent internal damage. When routing field wiring, use a three-conductor shielded triad cable with conductors sized 0.2 to 1.5 mm² (16 to 24 AWG). Keep the total wiring length between the Proximitor Sensor and the monitor within 305 meters (1000 feet) to preserve frequency response.
Maintenance & Reliability
Regular inspection of the probe tip and cable is recommended to detect wear or contamination. The PPS tip resists many chemicals, but verify compatibility with your process media. The stainless steel case provides robust mechanical protection. Because the probe is not pressure tested before shipment, if you require a pressure seal test for your specific application, contact Bently Nevada's custom design department. Periodic verification of the gap setting (recommended 1.0 mm / 40 mils) ensures continued linear operation.
Selection Guide & Purchasing Advice
Before purchasing, confirm your system requirements: total length, thread type, and connector style. The 330903-00-04-70-11-00 includes a 7-meter FluidLoc cable and ClickLoc connector, suitable for most installations. Ensure your monitor is compatible with 3300 NSv probe characteristics. For genuine parts and reliable supply, PLC Source PRO offers this new, original product in factory packing with a 12-month warranty.