Product Overview
When precise shaft vibration and position monitoring are critical, the Bently Nevada 330903-00-04-50-01-00 3300 NSv Proximity Probe delivers reliable performance for rotating machinery. This industrial automation module is part of the 3300 NSv series, designed for eddy-current proximity sensing in demanding environments. The 330903-00-04-50-01-00 features a M8X1 thread, a 5.0-meter total length, and a miniature coaxial ClickLoc connector with connector protector. It is mechanically and electrically interchangeable with the previous 3300 RAM probe, offering increased chemical resistance for process compressor applications.
Key Specifications
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Probe DC Resistance: 5.3 ± 0.7 ohms (for 5.0 m length)
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Linear Range: 1.5 mm (60 mils), from 0.25 to 1.75 mm (10 to 70 mils)
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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%
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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 m field wiring)
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Operating/Storage 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
Technical Specifications
| Parameter |
Value |
| Probe Length |
5.0 meters (16.4 feet) |
| Thread Size |
M8X1 |
| Connector Type |
Miniature coaxial ClickLoc with protector |
| Extension Cable DC Resistance (Center) |
0.220 Ω/m (0.067 Ω/ft) |
| Extension Cable DC Resistance (Shield) |
0.066 Ω/m (0.020 Ω/ft) |
| Extension Cable Capacitance |
69.9 pF/m (21.3 pF/ft) typical |
| Field Wiring |
0.2 to 1.5 mm² (16 to 24 AWG), max 305 m |
| Target Size (flat) |
Min 8.9 mm (0.35 in), recommended 13 mm (0.5 in) |
| Probe Cable |
75 Ω coaxial, FEP insulated |
| Maximum Torque |
0.56 N•m (5 in•lb), recommended finger tight |
| Minimum Bend Radius |
25.4 mm (1.0 in) |
| Probe Case Torque (M8X1) |
Max 7.3 N•m (65 in•lb), recommended 5.1 N•m (45 in•lb) |
| Max Thread Engagement |
12 mm |
Performance and Reliability
The 330903-00-04-50-01-00 provides a linear range of 1.5 mm, starting at approximately 0.25 mm from the target. Its incremental scale factor of 7.87 V/mm ensures accurate displacement measurement. With a deviation from best fit straight line of less than ±0.06 mm, this probe delivers consistent, repeatable readings. The probe's side-view characteristics are superior to the 3000-series 190 probe when gapping at the same distance, making it a reliable choice for tight installations.
Applications
This Bently Nevada 330903-00-04-50-01-00 is ideal for monitoring shaft vibration and axial position in turbines, compressors, pumps, and other rotating equipment. Its enhanced chemical resistance makes it particularly suitable for process compressor applications where exposure to aggressive media is common. The probe's compatibility with previous 3300 RAM systems allows for straightforward upgrades in existing installations.
Installation and Setup
Install the 330903-00-04-50-01-00 with finger-tight torque (maximum 0.56 N•m) to avoid damaging the threads. Ensure the target surface is clean and meets the minimum size requirements. For field wiring, use a three-conductor shielded triad cable with a maximum length of 305 meters between the Proximitor Sensor and monitor. For axial position measurements on shafts smaller than 13 mm, adjust the gap to minimize scale factor changes.
Maintenance and Longevity
Routine inspection of the probe tip and cable is recommended to detect any physical damage. The PPS tip and stainless steel case resist corrosion and wear. Operating within the specified temperature range (-52°C to +177°C) ensures consistent performance. The probe's design seals differential pressure with a Viton O-ring, but it is not pressure tested before shipment; contact the custom design department if pressure testing is required for your application.
Compatibility and Integration
The 330903-00-04-50-01-00 works seamlessly with Bently Nevada 3300 XL NSv Proximitor Sensors and monitors. It is mechanically and electrically interchangeable with the 3300 RAM probe and extension cable, simplifying retrofits. The miniature coaxial ClickLoc connector ensures secure, reliable connections.
Selection Guide
Before purchasing, verify the required probe length, thread type, and connector configuration. This model (330903-00-04-50-01-00) is configured with a 5.0-meter cable and M8X1 thread. Ensure compatibility with your existing monitoring system. For expert advice and genuine parts, trust PLC Source PRO as your reliable supplier of industrial automation components.