Product Introduction
When precise shaft vibration and position monitoring are critical, the Bently Nevada 330903-00-04-50-01-05 delivers reliable performance. This 3300 NSv proximity probe is designed for industrial rotating machinery, offering enhanced chemical resistance over previous RAM probes. With a 5.0-meter total length and M8X1 thread, this probe integrates seamlessly into existing monitoring systems.
Technical Specifications
The following specifications are directly from the manufacturer for the 330903-00-04-50-01-05:
| Parameter |
Value |
| Probe dc Resistance (5.0 m) |
5.3 ± 0.7 ohms |
| Linear Range |
1.5 mm (60 mils), from 0.25 to 1.75 mm (10 to 70 mils) (approximately -1 to -13 Vdc) |
| Recommended Gap Setting |
1.0 mm (40 mils) |
| Incremental Scale Factor (ISF) |
7.87 V/mm (200 mV/mil) +12.5%/-20% |
| Deviation from Best Fit Straight Line (DSL) |
Less than ±0.06 mm (±2.3 mils) |
| Frequency Response |
0 to 10 kHz: +0, -3 dB typical (up to 305 m field wiring) |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 304 stainless steel (SST) |
| Probe Cable |
75 Ω coaxial, FEP insulated; total lengths 0.5, 1, 5, or 7 m |
| Operating/Storage Temperature |
-52°C to +177°C (-62°F to +351°F) |
| Maximum Torque |
0.56 N•m (5 in•lb) |
| Minimum Bend Radius |
25.4 mm (1.0 in) |
| Thread Engagement (M8x1) |
12 mm max |
Industry Applications
This probe excels in process compressor applications where chemical resistance is essential. Its side-view characteristics outperform the 3000-series 190 probe, making it ideal for tight installations. Use it for radial vibration and axial position monitoring on turbines, pumps, and motors. The 5.0-meter cable length suits machines with distant monitoring panels.
Installation & Setup Guidance
Install the probe with finger-tight torque, then apply up to 0.56 N•m (5 in•lb) for final positioning. Ensure the target surface is clean and the gap is set near 1.0 mm (40 mils) for optimal linearity. For field wiring, use a three-conductor shielded triad cable; maximum length between the Proximitor Sensor and monitor is 305 meters (1,000 feet). Refer to frequency response graphs for signal rolloff at high frequencies with longer wiring.
Maintenance & Reliability
Regularly inspect the probe cable for bends beyond the 25.4 mm (1.0 in) minimum radius. Check the tip for contamination or damage. The PPS tip resists chemicals, but verify environmental compatibility. The probe seals differential pressure with a Viton O-ring; note that probes are not pressure tested before shipment. If your application requires pressure seal verification, request it from the custom design department.
Compatibility & Integration
The 330903-00-04-50-01-05 is mechanically and electrically compatible with Bently Nevada's previous 3300 RAM proximity probe and extension cable. This allows direct replacement in existing systems. The ClickLoc connector ensures secure attachment. Multiple agency approvals (option 05) broaden its acceptance in global installations.
Buying Guide & Purchasing Advice
Before ordering, verify your shaft diameter and target size. For shaft diameters smaller than 13 mm (0.5 in), expect scale factor changes—reduce the gap to minimize impact. Choose the correct total length (5.0 m here) and connector type. PLC Source PRO ensures new, factory-packed units with a 12-month warranty. Contact our team for application-specific questions.