Optimized for High-Precision Turbine Expansion and Shaft Position Monitoring
The Bently Nevada 330851-01-000-070-10-01-00 3300 XL 25 mm Proximity Probe is a premium non-contact eddy current displacement sensor designed for continuous monitoring of differential expansion, axial shaft position, and large-range rotor movement in critical rotating machinery. As an integral component of the 3300 XL 25 mm Proximity Transducer System, this probe delivers outstanding accuracy, long-term stability, and dependable performance in turbine supervisory instrumentation (TSI) and machinery protection applications. The complete system consists of a dedicated 25 mm probe, a matched extension cable, and a 3300 XL 25 mm Proximitor Sensor, providing a wide linear measurement range for demanding industrial environments.
The 330851-01-000-070-10-01-00 configuration features a 1¼-12 threaded probe body, 70 mm overall case length, 1.0 m integral cable, stainless-steel armored cable protection, and a standard approval configuration. Its rugged construction withstands vibration, abrasion, and harsh operating conditions, making it a trusted solution for power generation, petrochemical, oil & gas, and heavy industrial applications.
Product Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330851-01-000-070-10-01-00 |
| 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 | 70 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Armor Option | Stainless Steel Armor |
| Agency Approval | Standard / No Approvals |
| Probe Body Material | AISI 304 Stainless Steel |
| Probe Tip Material | PEEK (Polyetheretherketone) |
| System Output | 20 mV/mil (0.787 V/mm) |
| Linear Measurement Range | 12.7 mm (500 mils) (Complete System) |
| Compatible Components | 3300 XL 25 mm Extension Cable & Proximitor Sensor |
| Primary Measurements | Differential Expansion, Shaft Position, Rotor Displacement |
| Operating Temperature | -35°C to +200°C (Probe Assembly) |
| Dimensions | Approx. Ø25 mm Probe Tip × 70 mm Case Length |
| Weight | Approximately 0.33 kg |
Industrial Applications
The 330851-01-000-070-10-01-00 is developed for high-value rotating equipment where precise displacement monitoring is essential for operational safety and equipment 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 thermal 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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Power generation plants
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Petrochemical facilities
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Oil & gas production systems
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Refinery rotating equipment
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Heavy-duty industrial machinery
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OEM turbine protection packages
Its armored cable construction enhances durability in installations exposed to continuous vibration and mechanical stress while maintaining highly accurate displacement measurements.
Key Performance Advantages
Designed for demanding industrial environments, the 330851-01-000-070-10-01-00 combines precision sensing technology with robust mechanical protection.
Key advantages
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High-accuracy non-contact eddy current measurement
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Wide 12.7 mm (500 mil) linear measurement range
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Stainless-steel armored cable for superior mechanical protection
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Excellent long-term stability and repeatability
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Rugged AISI 304 stainless-steel probe construction
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High-performance PEEK probe tip for demanding environments
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Optimized for turbine differential expansion monitoring
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Seamless compatibility with Bently Nevada 3500 machinery protection systems
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Reliable operation under severe industrial conditions
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Supports predictive maintenance and minimizes unexpected downtime
Technical FAQs
1. What is the primary purpose of the 330851-01-000-070-10-01-00?
It is designed to measure differential expansion, shaft position, and large-range rotor displacement 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 "070" option indicate?
The 070 suffix specifies a 70 mm overall probe case length.
4. What cable length is supplied?
This configuration includes a 1.0-meter (3.3-foot) integral cable.
5. Is the cable armored?
Yes. The 01 armor option designates a stainless-steel armored cable, providing increased protection against abrasion and mechanical damage.
6. What is the probe thread type?
The probe uses a 1¼-12 threaded case, making it suitable for standard turbine monitoring installations.
7. What measurement range does the complete system provide?
When used with the matching extension cable and Proximitor Sensor, the system offers a 12.7 mm (500 mil) linear measurement range.
8. What industries commonly use this probe?
It is widely deployed in power generation, petrochemical processing, oil & gas production, refining, and other industries that rely on continuous monitoring of critical rotating machinery.
9. What are the approximate dimensions and weight?
The probe features a 25 mm sensing tip, 70 mm case length, and weighs approximately 0.33 kg.
10. Why choose the 330851-01-000-070-10-01-00?
Its extended measurement capability, armored construction, precision sensing technology, and proven compatibility with Bently Nevada machinery protection systems make it an excellent solution for turbine supervisory instrumentation and predictive maintenance programs.
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