Built for Long-Range Installation and High-Accuracy Turbine Monitoring
The Bently Nevada 330851-01-000-030-50-01-00 3300 XL 25 mm Proximity Probe is a precision non-contact eddy current sensor designed for demanding machinery protection applications requiring extended cable lengths and exceptional measurement stability. As part of the 3300 XL 25 mm Proximity Transducer System, this probe is widely used for monitoring differential expansion, axial shaft position, and large-range displacement in steam turbines, generators, compressors, and other critical rotating equipment. The system combines a dedicated 25 mm probe, matching extension cable, and Proximitor Sensor to provide highly reliable measurements that support predictive maintenance and maximize equipment availability.
This 330851-01-000-030-50-01-00 configuration includes a 1¼-12 threaded probe body, 30 mm case length, 5.0 m integral cable, stainless-steel armored cable, and standard agency approval option, making it an excellent choice for installations exposed to vibration, abrasion, and harsh industrial environments. Its rugged construction and high-performance sensing technology help maintain accurate displacement measurements throughout the equipment lifecycle.
Product Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330851-01-000-030-50-01-00 |
| Product Type | 3300 XL 25 mm Proximity Probe |
| Series | 3300 XL 25 mm Proximity Transducer System |
| Measurement Technology | Eddy Current (Non-contact) |
| Probe Case Type | 1¼-12 Thread |
| Unthreaded Length | 0 mm |
| Overall Case Length | 30 mm |
| Integral Cable Length | 5.0 m (16.4 ft) |
| Armor Option | Stainless Steel Armor |
| Agency Approval | Standard / No Approvals |
| Probe Body Material | AISI 304 Stainless Steel |
| Probe Tip Material | Polyphenylene Sulfide (PPS) |
| Linear Measurement Range | 12.7 mm (500 mils) (Complete System) |
| Output Sensitivity | 20 mV/mil (0.787 V/mm) |
| System Compatibility | 3300 XL 25 mm Extension Cable & Proximitor Sensor |
| Primary Measurements | Differential Expansion, Shaft Position, Displacement |
| Dimensions | Approx. Ø25 mm Probe Tip × 30 mm Case Length |
| Weight | Approximately 0.23 kg |
Typical Applications
Designed for continuous machinery protection, the 330851-01-000-030-50-01-00 is ideal for industries that require accurate displacement monitoring under demanding operating conditions.
Typical applications include:
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Steam turbine supervisory instrumentation (TSI)
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Differential expansion monitoring
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Rotor expansion measurement
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Axial shaft position monitoring
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Large steam turbines
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Industrial gas turbines
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Centrifugal compressors
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Turbo-generators
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Power generation plants
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Petrochemical facilities
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Oil & gas processing plants
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Heavy industrial rotating equipment
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Refinery machinery
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OEM turbine protection systems
Its extended cable length and armored construction simplify installation while ensuring dependable operation in environments subject to vibration and mechanical stress.
Key Product Benefits
The 330851-01-000-030-50-01-00 combines durability, precision, and installation flexibility for critical machinery monitoring.
Why choose this probe?
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Extended 5-meter integral cable for flexible installation
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Stainless-steel armor provides superior mechanical protection
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High-accuracy non-contact eddy current sensing
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Optimized for differential expansion and shaft position measurements
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Excellent long-term measurement stability
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Robust stainless-steel probe construction
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Compatible with API 670-style machinery monitoring systems
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Integrates seamlessly with the Bently Nevada 3500 platform
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Designed for continuous industrial operation
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Supports predictive maintenance and minimizes unplanned downtime
Technical FAQs
1. What is the primary application of the 330851-01-000-030-50-01-00?
It is primarily used for differential expansion, shaft position, and large-range displacement monitoring on critical rotating machinery.
2. Which transducer system is this probe designed for?
It is part of the 3300 XL 25 mm Proximity Transducer System, which includes a matching extension cable and Proximitor Sensor.
3. What does the "01" probe case option indicate?
The 01 configuration specifies a 1¼-12 threaded probe body, commonly used in turbine monitoring applications.
4. What does the "030" option represent?
It indicates an overall probe case length of 30 mm.
5. What cable length is included?
This configuration includes a 5.0-meter (16.4-foot) integral cable, providing greater installation flexibility.
6. Is the cable armored?
Yes. The 01 armor option specifies stainless-steel armored cable, offering enhanced resistance to abrasion, vibration, and mechanical damage.
7. What is the measurement range?
When used as part of the complete transducer system, it provides a 12.7 mm (500 mil) linear measurement range.
8. Which monitoring systems are compatible?
The probe is compatible with the 3300 XL 25 mm Proximitor Sensor and Bently Nevada 3500 Series Machinery Protection System.
9. What are the approximate dimensions and weight?
The probe has a 25 mm sensing tip, 30 mm case length, and weighs approximately 0.23 kg.
10. Why is this model popular in turbine applications?
Its long cable, armored construction, wide measurement range, and high measurement accuracy make it an ideal solution for continuous turbine supervisory instrumentation and predictive maintenance programs.
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