Precision Engineered for Continuous Shaft Displacement Monitoring
The Bently Nevada 330851-02-000-034-50-00-00 3300 XL 25 mm Proximity Probe is a high-performance non-contact eddy current sensor developed for precise measurement of shaft displacement, differential expansion, rotor position, and axial movement in critical rotating machinery. As part of the renowned 3300 XL 25 mm Proximity Transducer System, this probe delivers outstanding accuracy, repeatability, and long-term reliability, helping industrial facilities maximize equipment uptime while reducing maintenance costs. The complete system includes a matched proximity probe, extension cable, and Proximitor Sensor to ensure optimal system performance across demanding operating conditions.
The 330851-02-000-034-50-00-00 configuration features an M30 × 2 threaded probe body, 34 mm overall case length, 5.0 m integral FluidLoc cable, non-armored construction, and standard approval option. Its compact dimensions make it ideal for installations requiring additional mounting flexibility without sacrificing measurement accuracy or mechanical durability. Designed for harsh industrial environments, this model is widely used in turbine protection systems, compressor monitoring, and large rotating equipment.
Technical Data
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330851-02-000-034-50-00-00 |
| Product Type | 3300 XL 25 mm Proximity Probe |
| Product Family | 3300 XL 25 mm Proximity Transducer System |
| Measurement Technology | Non-contact Eddy Current |
| Probe Case Type | M30 × 2 Thread |
| Unthreaded Length | 0 mm |
| Overall Case Length | 34 mm |
| Integral Cable Length | 5.0 m (16.4 ft) |
| Cable Type | 75 Ω FluidLoc Triaxial Cable |
| Armor Option | No Armor |
| Agency Approval | Standard / No Approvals |
| Probe Body Material | AISI 304 Stainless Steel |
| Probe Tip Material | Polyetheretherketone (PEEK) |
| Output Sensitivity | 20 mV/mil (0.787 V/mm) |
| Linear Measurement Range | 12.7 mm (500 mils) |
| Operating Temperature | -35°C to +200°C |
| Compatible Components | 3300 XL 25 mm Extension Cable & Proximitor Sensor |
| Typical Measurements | Differential Expansion, Shaft Position, Rotor Displacement |
| Dimensions | M30 × 2 Thread × 34 mm Overall Case Length |
| Weight | Approximately 0.23 kg |
Industrial Applications
The 330851-02-000-034-50-00-00 is designed for continuous online condition monitoring of high-value rotating assets where dependable displacement measurements are essential.
Typical applications include:
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Steam turbine supervisory instrumentation (TSI)
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Differential expansion monitoring
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Rotor displacement measurement
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Axial shaft position monitoring
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Steam turbine generators
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Industrial gas turbines
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Centrifugal compressors
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Turbo-expanders
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Power generation plants
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Petrochemical processing facilities
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Oil & gas production systems
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Refinery rotating equipment
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Heavy manufacturing machinery
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OEM machinery protection systems
The integrated 5-meter cable simplifies installation over longer distances while maintaining excellent signal integrity and measurement stability.
Outstanding Features
The 330851-02-000-034-50-00-00 combines advanced sensing technology with industrial-grade durability, making it a trusted solution for machinery protection professionals.
Key Advantages
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High-precision non-contact displacement measurement
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Compact 34 mm probe body for versatile installation
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Long 5.0 m integral FluidLoc cable
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Wide 12.7 mm (500 mil) linear measurement range
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Durable AISI 304 stainless-steel construction
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High-performance PEEK probe tip
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Excellent resistance to vibration and harsh environments
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Compatible with Bently Nevada 3500 Series monitoring systems
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Supports predictive maintenance programs
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Reduces unplanned downtime and maintenance expenses
Technical FAQs
1. What is the primary function of this proximity probe?
It measures shaft displacement, differential expansion, and axial shaft position using non-contact eddy current technology.
2. Which monitoring system is it designed for?
It is designed for the 3300 XL 25 mm Proximity Transducer System, including the matching extension cable and Proximitor Sensor.
3. What does the "02" case option indicate?
The 02 designation specifies an M30 × 2 threaded metric probe body for standard metric installations.
4. What does the "034" configuration represent?
It identifies a 34 mm overall probe case length, offering additional flexibility for specialized mounting requirements.
5. What cable length is supplied?
This model includes a 5.0-meter (16.4-foot) integral FluidLoc triaxial cable.
6. Is the cable armored?
No. The 00 armor option indicates a standard non-armored cable.
7. What is the operating temperature range?
The probe is designed for continuous operation from -35°C to +200°C, making it suitable for demanding industrial environments.
8. What measurement range does the complete system provide?
When used with the matching Proximitor Sensor and extension cable, the system provides a 12.7 mm (500 mil) linear range with an output sensitivity of 20 mV/mil (0.787 V/mm).
9. What are the dimensions and approximate weight?
The probe has an M30 × 2 threaded body, 34 mm overall case length, and an approximate weight of 0.23 kg.
10. Why is this model suitable for critical rotating machinery?
Its compact design, extended cable length, exceptional measurement accuracy, and rugged construction make it an excellent choice for protecting turbines, compressors, generators, and other mission-critical equipment.
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