Product Overview
When process compressor applications demand reliable vibration monitoring, the Bently Nevada 330903-00-03-10-11-05 delivers precise proximity sensing in harsh environments. This 3300 NSv probe features an M8X1 thread without armor, a 1.0-meter (39-inch) total length, and a miniature coaxial ClickLoc connector with connector protector and FluidLoc cable. It is mechanically and electrically interchangeable with the previous 3300 RAM probe, offering increased chemical resistance for demanding service.
Key Benefits & Performance
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Linear Range: 1.5 mm (60 mils) from 0.25 to 1.75 mm (10-70 mils), approximately -1 to -13 Vdc.
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Incremental Scale Factor (ISF): 7.87 V/mm (200 mV/mil) with +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 (1000 feet) of field wiring.
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Temperature Range: Operating and storage from -52°C to +177°C (-62°F to +351°F).
Technical Specifications
| Parameter |
Value |
| Model |
330903 - 3300 NSv Probe, M8X1 thread, without armor |
| Unthreaded Length |
00 mm |
| Overall Case Length |
30 mm |
| Total Length |
1.0 meter (39 in) |
| Connector |
Miniature coaxial ClickLoc with connector protector, FluidLoc cable |
| Agency Approval |
Multiple Approvals |
| Probe DC Resistance (1.0 m) |
4.2 ± 0.5 ohms |
| Extension Cable DC Resistance |
Center conductor: 0.220 Ω/m; Shield: 0.066 Ω/m |
| Extension Cable Capacitance |
69.9 pF/m typical |
| Field Wiring |
0.2 to 1.5 mm² (16-24 AWG); recommended three-conductor shielded triad; max length 305 m |
| Recommended Gap Setting |
1.0 mm (40 mils) |
| Target Size (flat) |
Minimum 8.9 mm dia; recommended 13 mm dia |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 304 stainless steel |
| Probe Cable |
75 Ω coaxial, FEP insulated; lengths 0.5, 1, 5, or 7 m |
| Maximum Torque |
0.56 N•m (5 in•lb) |
| Minimum Bend Radius |
25.4 mm (1.0 in) |
| Probe Case Torque (M8X1) |
Max rated 7.3 N•m; recommended 5.1 N•m |
| Thread Engagement Length |
M8x1, 12 mm |
Industry Applications
This probe excels in process compressor monitoring, where chemical resistance is critical. It also suits axial position measurements on shafts, though for diameters smaller than 13 mm, scale factor changes may occur—reducing the gap helps limit this effect. The side-view characteristics outperform the 3000-series 190 probe when gapping at the same distance, making it ideal for tight installations.
Installation & Setup
Install the probe with finger-tight torque, never exceeding 0.56 N•m. Ensure the target surface is flat and meets the minimum diameter (8.9 mm). For field wiring, use a three-conductor shielded triad cable; maximum length between the Proximitor Sensor and monitor is 305 meters. Calibrate the gap to 1.0 mm (40 mils) for optimal linearity.
Maintenance & Reliability
The 330903-00-03-10-11-05 is designed for long service life with a Viton O-ring sealing differential pressure. Probes are not pressure-tested before shipment; for pressure-seal verification, contact our custom design department. Regularly inspect the cable for bends exceeding 25.4 mm radius and check connector torque to prevent signal degradation.
Selection Guide
Before ordering, verify the total length (1.0 m), thread type (M8X1), and connector option (11). This model includes multiple agency approvals. As a reliable supplier, PLC Source PRO ensures new, original factory-packed units with a 12-month warranty.