Extended Reach Precision Sensor for Deep-Mount Machinery Monitoring
The Bently Nevada 330904-00-25-05-02-05 3300 NSv Proximity Probe is a high-performance non-contact eddy-current sensor designed for shaft vibration and position measurement in rotating machinery with deep mounting requirements. As part of the 3300 NSv (Narrow Side View) series, this model combines compact sensing accuracy with an extended mechanical configuration, making it suitable for installations where standard probe lengths are not sufficient.
Its NSv architecture is specifically engineered to reduce side-view interference from nearby metallic structures, ensuring stable and repeatable measurements even in mechanically dense environments. This makes it a strong fit for compressors, turbines, and heavy-duty industrial rotating equipment used in continuous production processes.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330904-00-25-05-02-05 |
| Product Series | 3300 NSv Proximity Probe |
| Measurement Principle | Eddy-current, non-contact |
| Thread Type | M8 × 1 metric thread |
| Case Length | 250 mm (extended reach configuration) |
| Unthreaded Length | 0 mm |
| Cable Length | 0.5 m |
| Connector Type | Miniature ClickLoc coaxial connector |
| Cable Type | 75 Ω FEP insulated coaxial cable |
| Housing Material | AISI 304 stainless steel |
| Probe Tip Material | PPS (Polyphenylene Sulfide) |
| Operating Temperature | -52°C to +177°C |
| Frequency Response | 0–10 kHz |
| Linear Measurement Range | ~1.5 mm typical NSv system |
| Sensitivity | ~7.87 V/mm (system dependent) |
| Approx. Weight | ~0.15–0.5 kg (configuration dependent) |
Application Scenarios
This extended NSv probe is widely used in machinery where deeper insertion or special mechanical alignment is required:
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Centrifugal and axial compressors
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Steam and gas turbines
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Turbo-expanders
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High-speed industrial pumps
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Refrigeration and cryogenic systems
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Air separation units (ASU)
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Heavy petrochemical rotating equipment
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OEM skid-mounted machinery
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Condition monitoring and protection systems
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Continuous predictive maintenance platforms
Its extended case design makes it particularly useful in equipment layouts with recessed mounting points or thick housings.
Key Advantages
◆ Extended Mechanical Reach Design
The 250 mm configuration enables installation in deeper machine housings where standard probes cannot reach effectively.
◆ Stable NSv Measurement Architecture
Reduces interference from surrounding metallic structures, improving signal reliability.
◆ High Accuracy Vibration Detection
Provides consistent shaft vibration and displacement readings for critical machinery protection.
◆ Industrial-Grade Construction
Stainless steel body ensures durability in high-temperature and corrosive environments.
◆ Predictive Maintenance Support
Enables early fault detection, improving uptime and reducing maintenance costs.
◆ Reliable Signal Transmission
75 Ω coaxial cable ensures low-noise, stable measurement performance.
◆ Retrofit & OEM Flexibility
Suitable for both new machinery builds and legacy system upgrades.
Technical FAQs
Q1: What does this probe measure?
It measures shaft vibration and radial position without physical contact.
Q2: What does NSv mean?
NSv stands for Narrow Side View, designed to minimize interference from nearby metal surfaces.
Q3: What is special about this model?
It features an extended 250 mm probe body for deep installation requirements.
Q4: What is the cable length?
This configuration includes a 0.5-meter integrated coaxial cable.
Q5: What is the thread type?
It uses an M8 × 1 metric threaded mounting system.
Q6: Which industries use this probe?
Oil & gas, petrochemical, power generation, and industrial manufacturing.
Q7: Is it suitable for turbines and compressors?
Yes, it is widely used in turbine and compressor monitoring systems.
Q8: Can NSv components be mixed?
No, probe, cable, and Proximitor sensor must be properly matched as a system.
Q9: What maintenance is required?
Routine inspection of cable condition, mounting stability, and measurement verification.
Q10: What is the main installation consideration?
Ensure correct alignment with the rotating target and proper gap setting.
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