Reliable 25 mm Proximity Probe for High-Performance Turbine Monitoring
The Bently Nevada 330851-04-000-020-50-00-05 3300 XL 25 mm Proximity Probe is a premium non-contact eddy current sensor designed for continuous monitoring of shaft displacement, differential expansion, axial position, and rotor movement in mission-critical rotating machinery. As part of the 3300 XL 25 mm Proximity Transducer System, this probe delivers exceptional measurement stability, extended sensing capability, and dependable long-term performance in demanding industrial environments. The complete system consists of a precision probe, matched extension cable, and Proximitor Sensor, providing accurate displacement measurements that support predictive maintenance and maximize equipment availability.
This configuration features an M40 × 1.5 threaded probe body, 20 mm overall case length, 5.0 m integral FluidLoc cable, non-armored construction, and multiple agency approvals. Its compact metric housing makes installation easier in applications where mounting space is limited while maintaining the wide measurement range required for turbine supervisory instrumentation (TSI), compressors, generators, and other heavy-duty rotating equipment.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330851-04-000-020-50-00-05 |
| Product Type | 3300 XL 25 mm Proximity Probe |
| Series | 3300 XL 25 mm Proximity Transducer System |
| Measurement Principle | Non-contact Eddy Current |
| Probe Thread | M40 × 1.5 Metric |
| Unthreaded Length | 0 mm |
| Overall Case Length | 20 mm |
| Integral Cable Length | 5.0 m (16.4 ft) |
| Cable Type | 75 Ω FluidLoc Triaxial Cable |
| Armor Option | No Armor |
| Agency Approval | Multiple Approvals |
| Probe Housing 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 & 3300 XL 25 mm Proximitor Sensor |
| Typical Measurements | Differential Expansion, Shaft Position, Rotor Displacement |
| Dimensions | M40 × 1.5 Thread × 20 mm Overall Case Length |
| Weight | Approximately 0.24 kg |
Where This Probe Excels
Designed for demanding industrial installations, the 330851-04-000-020-50-00-05 delivers stable, repeatable measurements that help protect valuable rotating assets.
Typical applications include:
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Steam turbine supervisory instrumentation (TSI)
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Differential expansion measurement
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Rotor displacement monitoring
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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 facilities
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Petrochemical plants
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Oil & gas processing equipment
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Refinery rotating machinery
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Heavy manufacturing systems
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OEM machinery protection packages
Its 5-meter integral cable simplifies installation while maintaining outstanding signal integrity over longer cable runs.
Performance Highlights
The 330851-04-000-020-50-00-05 is engineered to deliver reliable monitoring performance throughout the service life of critical equipment.
Key Benefits
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High-precision non-contact eddy current technology
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Compact 20 mm probe body for restricted mounting locations
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M40 × 1.5 metric threaded housing
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Wide 12.7 mm (500 mil) linear measurement range
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Durable stainless-steel construction
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High-performance PEEK probe tip for extended service life
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5.0 m FluidLoc cable for installation flexibility
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Multiple agency approvals for international projects
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Compatible with Bently Nevada 3500 Series monitoring systems
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Supports predictive maintenance while reducing unexpected downtime
Technical FAQs
1. What is the primary function of the 330851-04-000-020-50-00-05?
It continuously measures shaft displacement, differential expansion, and axial shaft position using non-contact eddy current sensing technology.
2. Which transducer system is this probe part of?
It belongs to the 3300 XL 25 mm Proximity Transducer System, consisting of the probe, extension cable, and Proximitor Sensor.
3. What thread type does this model use?
This configuration features an M40 × 1.5 metric threaded probe body, suitable for installations requiring larger metric mounting threads.
4. What does the "020" option represent?
The 020 designation specifies an overall probe case length of 20 mm, making it suitable for compact installations.
5. What cable length is included?
The probe is supplied with a 5.0-meter (16.4-foot) integral FluidLoc triaxial cable, allowing flexible routing in industrial installations.
6. Is the cable armored?
No. This configuration uses the 00 option, indicating a standard non-armored cable.
7. What does the "05" approval code indicate?
The 05 suffix identifies a configuration with Multiple Agency Approvals, supporting use in internationally certified industrial applications.
8. What measurement range does the complete system provide?
When paired with the matching Proximitor Sensor and extension cable, the system provides a 12.7 mm (500 mil) linear measurement range with an output sensitivity of 20 mV/mil (0.787 V/mm).
9. What are the approximate dimensions and weight?
The probe features an M40 × 1.5 threaded body, 20 mm case length, and weighs approximately 0.24 kg.
10. Why is this model a good choice for turbine applications?
Its compact design, extended cable length, metric mounting configuration, and proven measurement stability make it an excellent solution for protecting steam turbines, compressors, generators, and other critical rotating machinery.
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