Precision Differential Expansion Measurement for Steam Turbine Applications
The Bently Nevada 330851-01-000-030-10-00-05 3300 XL 25 mm Proximity Probe is a premium non-contact eddy current sensor engineered for high-accuracy displacement measurement in steam turbine supervisory instrumentation (TSI) systems. As a core component of the 3300 XL 25 mm Proximity Transducer System, this probe is specifically designed to monitor differential expansion, shaft position, and large-range displacement on medium and large rotating machinery. Its robust construction and extended sensing capability make it an excellent choice for demanding industrial environments where precision and long-term reliability are essential.
The 330851-01-000-030-10-00-05 configuration features a 1¼-12 threaded probe body, 30 mm overall case length, 1.0 m integral cable, non-armored construction, and multiple agency approvals. When paired with the matching 3300 XL 25 mm Extension Cable and 3300 XL 25 mm Proximitor Sensor, it delivers a 12.7 mm (500 mil) linear measurement range, helping operators improve machinery protection, reduce maintenance costs, and maximize equipment uptime.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330851-01-000-030-10-00-05 |
| 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 | 30 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Armor Option | No Armor |
| Agency Approval | Multiple Approvals |
| Probe Material | Stainless Steel |
| Measurement Range | 12.7 mm (500 mil) Linear Range (System) |
| Output Sensitivity | 0.787 V/mm (20 mV/mil) |
| System Compatibility | 3300 XL 25 mm Extension Cable & Proximitor Sensor |
| Typical Applications | Differential Expansion, Shaft Position |
| Operating Temperature | Refer to complete system specifications |
| Dimensions | Approx. Ø25 mm Probe Tip × 30 mm Case Length |
| Weight | Approximately 0.23 kg |
Typical Industrial Applications
Designed for large rotating assets, the 330851-01-000-030-10-00-05 is widely used in machinery protection systems that require extended measurement capability and exceptional reliability.
Typical applications include:
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Steam turbine generators
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Turbine Supervisory Instrumentation (TSI) systems
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Differential expansion monitoring
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Rotor-to-stator displacement measurement
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Axial shaft position monitoring
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Large industrial compressors
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Gas turbine auxiliary systems
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Power generation facilities
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Petrochemical processing plants
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Refinery rotating equipment
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Heavy industrial machinery
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OEM turbine monitoring packages
Its extended sensing range makes it particularly effective for monitoring thermal expansion between the rotor and casing during startup, shutdown, and continuous operation.
Product Advantages
Designed for high-value rotating assets, the 330851-01-000-030-10-00-05 provides dependable performance under demanding operating conditions.
Key benefits
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Extended 12.7 mm linear measurement range
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Optimized for steam turbine differential expansion monitoring
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High-precision non-contact eddy current technology
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Rugged stainless-steel construction for long service life
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Excellent immunity to industrial electrical interference when used with the complete 3300 XL system
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Multiple agency approvals simplify global installations
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Reliable long-term measurement stability
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Seamless integration with Bently Nevada 3500 monitoring systems
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Supports predictive maintenance and machinery protection programs
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Reduces unexpected downtime and maintenance costs
Technical FAQs
1. What is the primary function of the 330851-01-000-030-10-00-05?
It measures differential expansion, shaft position, and large-range displacement on rotating machinery using non-contact eddy current sensing.
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" case type indicate?
The 01 option specifies a 1¼-12 threaded probe case, designed for standard turbine monitoring installations.
4. What does the "030" option represent?
It indicates an overall probe case length of 30 mm.
5. What cable length is included?
This model includes a 1.0-meter integral cable, intended for use with a matching extension cable and Proximitor Sensor.
6. Does this probe include stainless-steel armor?
No. The 00 armor option specifies a standard non-armored cable.
7. What does the "05" approval option mean?
The 05 suffix indicates Multiple Agency Approvals, supporting installation in a wider range of industrial environments.
8. What is the measurement range of the complete system?
When used with the matching components, the complete transducer 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, 30 mm case length, and weighs approximately 0.23 kg.
10. Why choose the 330851-01-000-030-10-00-05?
Its extended measuring range, durable construction, precision sensing technology, and compatibility with Bently Nevada machinery protection systems make it an excellent solution for turbine supervisory instrumentation and critical rotating equipment monitoring.
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