Product Overview
The Bently Nevada 330903-00-04-70-02-00 is a high-performance 3300 NSv proximity probe designed for reliable vibration and position monitoring in critical rotating machinery. This Industrial Automation Module delivers precise measurements in demanding environments, offering enhanced chemical resistance and superior side-view characteristics compared to earlier models.
Part of the trusted 3300 NSv series, the 330903-00-04-70-02-00 is mechanically and electrically interchangeable with Bently Nevada's previous 3300 RAM proximity probe, making it an ideal drop-in replacement for existing systems. With a 7.0-meter total length and a miniature coaxial ClickLoc connector, this probe ensures easy installation and consistent signal transmission.
Key Features & Benefits
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Enhanced Chemical Resistance: Suitable for process compressor applications where exposure to harsh media is common.
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Superior Side-View Characteristics: Better gapping accuracy at the same distance from the target compared to 3000-series 190 probes.
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Interchangeable Design: Directly compatible with legacy 3300 RAM systems, minimizing upgrade complexity.
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Precise Linear Range: 1.5 mm (60 mils) with a recommended gap setting of 1.0 mm (40 mils).
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Wide Temperature Tolerance: Operates 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 |
40 mm |
| Total Length |
7.0 meters (23.0 feet) |
| Connector & Cable Type |
Miniature coaxial ClickLoc connector, standard cable |
| Agency Approval |
Not required |
| Probe DC Resistance (RPROBE) |
5.9 ± 0.9 ohms (at 7.0 m) |
| Linear Range |
1.5 mm (60 mils), from 0.25 to 1.75 mm (10 to 70 mils) (approx. -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% including interchangeability error |
| 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, with up to 305 meters (1000 feet) of field wiring |
| Target Size (flat target) |
Minimum: 8.9 mm (0.35 in) diameter; Recommended minimum: 13 mm (0.5 in) diameter |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 304 stainless steel (SST) |
| Probe Cable Specifications |
75 Ω coaxial, fluoroethylene propylene (FEP) insulated; available in 0.5, 1, 5, or 7 meters |
| Recommended Torque |
Finger tight; Maximum torque 0.56 N•m (5 in•lb) |
| Minimum Bend Radius |
25.4 mm (1.0 in) with or without SST armor |
| Operating Temperature |
-52°C to +177°C (-62°F to +351°F) |
| Storage Temperature |
-52°C to +177°C (-62°F to +351°F) |
| Probe Pressure |
Seals differential pressure between probe tip and case; Viton O-ring |
| Connector-to-Connector Torque (M8X1) |
Maximum rated: 7.3 N•m (65 in•lb); Recommended: 5.1 N•m (45 in•lb) |
| Maximum Thread Engagement Length |
12 mm (M8x1) |
Applications
The 330903-00-04-70-02-00 excels in a variety of industrial settings:
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Process Compressors: The enhanced chemical resistance allows reliable operation in environments with aggressive media.
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Turbo Machinery: Provides accurate shaft vibration and position monitoring to prevent unplanned downtime.
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Generators and Pumps: Ensures stable operation by monitoring critical clearances and dynamic behavior.
Whether upgrading from legacy 3300 RAM systems or implementing new installations, this probe delivers the precision and durability required for continuous operation.
Installation & Setup
Proper installation is essential for optimal performance. Follow these guidelines:
- Mount the probe using the M8X1 thread with a maximum engagement length of 12 mm. Apply the recommended torque of 5.1 N•m (45 in•lb) for the probe case.
- Use the miniature coaxial ClickLoc connector for secure and quick cable attachment.
- Maintain the recommended gap setting of 1.0 mm (40 mils) for linear operation.
- For field wiring, use a three-conductor shielded triad cable with a maximum length of 305 meters (1,000 feet) between the Proximitor Sensor and the monitor. Refer to frequency response graphs for signal rolloff at high frequencies.
- Avoid bending the probe cable beyond the minimum bend radius of 25.4 mm (1.0 in) to prevent damage.
Maintenance & Reliability
The 330903-00-04-70-02-00 is built for long service life, but routine inspection ensures continued accuracy:
- Periodically check the probe tip and cable for physical damage or contamination.
- Verify that the connector is tight and free from corrosion.
- Monitor the DC resistance (5.9 ± 0.9 ohms) as a quick health check.
- Keep the probe and target area clean to maintain consistent scale factor.
With proper care, this probe reduces maintenance costs and extends the life of your monitoring system.
Selection Guide
When ordering the 330903-00-04-70-02-00, verify the following: unthreaded length (00 mm), overall case length (40 mm), total length (7.0 m), and connector type (miniature coaxial ClickLoc). Ensure compatibility with your existing Proximitor sensor and monitor. For additional support, contact PLC Source PRO for expert assistance.