High-Precision Differential Expansion Probe for Critical Rotating Machinery
The Bently Nevada 330851-01-000-070-10-00-05 3300 XL 25 mm Proximity Probe is a premium non-contact eddy current displacement sensor designed for high-accuracy monitoring of differential expansion, axial shaft position, and large-range rotor movement in critical rotating equipment. As part of the 3300 XL 25 mm Proximity Transducer System, this probe is engineered to deliver exceptional measurement stability and long-term reliability for turbine supervisory instrumentation (TSI) and machinery protection systems.
The 330851-01-000-070-10-00-05 configuration features a 1¼-12 threaded probe case, 70 mm overall case length, 1.0-meter integral cable, non-armored construction, and multiple agency approvals. When installed with the matching 3300 XL 25 mm Extension Cable and 3300 XL 25 mm Proximitor Sensor, the complete transducer system provides a 12.7 mm (500 mil) linear measurement range, making it ideal for monitoring large steam turbines, generators, compressors, and other high-value industrial assets. Its rugged stainless-steel construction and optimized electromagnetic performance help ensure dependable operation in harsh industrial environments.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330851-01-000-070-10-00-05 |
| Product Type | 3300 XL 25 mm Proximity Probe |
| Series | 3300 XL 25 mm Proximity Transducer System |
| Measurement Principle | Eddy Current (Non-contact) |
| Probe Case Type | 1¼-12 Thread |
| Unthreaded Length | 0 mm |
| Overall Case Length | 70 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Armor Option | No Armor |
| Agency Approval | Multiple Approvals |
| Probe Body Material | AISI 304 Stainless Steel |
| Probe Tip Material | High-Performance Engineering Polymer |
| Linear Measurement Range | 12.7 mm (500 mils) (Complete System) |
| Output Sensitivity | 20 mV/mil (0.787 V/mm) |
| Compatible Components | 3300 XL 25 mm Extension Cable & 3300 XL 25 mm Proximitor Sensor |
| Typical Measurement | Differential Expansion, Shaft Position, Rotor Displacement |
| Dimensions | Approx. Ø25 mm Probe Tip × 70 mm Case Length |
| Weight | Approximately 0.26 kg |
Typical Applications
Designed for continuous condition monitoring, the 330851-01-000-070-10-00-05 is widely used in industries where accurate shaft displacement measurement is essential for equipment protection and operational reliability.
Typical applications include:
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Steam turbine supervisory instrumentation (TSI)
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Differential expansion monitoring
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Rotor growth measurement
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Axial shaft position monitoring
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Large steam turbine generators
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Industrial gas turbines
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Centrifugal compressors
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Turbo-generators
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Petrochemical plants
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Oil & gas processing facilities
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Power generation stations
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Refinery rotating equipment
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Heavy industrial machinery
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OEM turbine monitoring systems
Its extended probe body provides additional installation flexibility while maintaining outstanding measurement accuracy throughout long-term operation.
Performance Highlights
Engineered for demanding industrial environments, the 330851-01-000-070-10-00-05 delivers dependable monitoring performance with minimal maintenance requirements.
Key advantages
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Large 12.7 mm linear measurement range
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Optimized for differential expansion applications
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Precision non-contact eddy current sensing technology
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70 mm probe body for flexible installation
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Rugged stainless-steel construction
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Excellent resistance to industrial vibration and interference
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Multiple agency approvals for international projects
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Compatible with API 670-compliant monitoring systems
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Integrates seamlessly with Bently Nevada 3500 Series monitors
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Helps improve equipment availability and reduce maintenance costs
Technical FAQs
1. What is the primary function of the 330851-01-000-070-10-00-05?
It measures differential expansion, shaft position, and large-range rotor displacement using non-contact eddy current technology.
2. Which transducer system does this probe belong to?
It is part of the 3300 XL 25 mm Proximity Transducer System, consisting of a probe, extension cable, and Proximitor Sensor.
3. What does the "01" probe case option indicate?
The 01 configuration specifies a 1¼-12 threaded probe case, commonly used for turbine supervisory instrumentation installations.
4. What does the "070" option represent?
The 070 option identifies a 70 mm overall probe case length, providing additional mounting flexibility.
5. What cable length is supplied?
This model includes a 1.0-meter (3.3-foot) integral cable, designed for use with compatible 3300 XL 25 mm system components.
6. Is the cable armored?
No. The 00 armor option specifies a standard non-armored cable configuration.
7. What does the "05" approval option mean?
The 05 suffix indicates Multiple Agency Approvals, making the probe suitable for a wide range of international industrial applications.
8. What is the measurement range?
When combined with the matching extension cable and Proximitor Sensor, the complete system provides a 12.7 mm (500 mil) linear measurement range.
9. What are the approximate dimensions and weight?
The probe features a 25 mm sensing tip, 70 mm case length, and weighs approximately 0.26 kg.
10. Why choose the 330851-01-000-070-10-00-05?
Its extended probe length, high measurement accuracy, rugged industrial construction, and compatibility with Bently Nevada machinery protection systems make it an excellent solution for continuous monitoring of critical rotating equipment.
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