Dependable Non-Contact Displacement Measurement for Critical Rotating Equipment
The Bently Nevada 330851-02-000-030-50-00-00 3300 XL 25 mm Proximity Probe is a premium eddy current proximity sensor engineered to deliver precise shaft displacement measurements in demanding industrial environments. As part of the 3300 XL 25 mm Proximity Transducer System, this probe provides reliable monitoring of differential expansion, axial shaft position, and rotor movement, helping operators maintain equipment health, reduce unplanned downtime, and improve maintenance efficiency. The complete transducer system includes the proximity probe, matching extension cable, and Proximitor Sensor for optimized measurement performance.
This configuration features an M30 × 2 threaded probe body, 30 mm overall case length, 5.0 m integral FluidLoc cable, non-armored construction, and standard agency approval option. Designed with durable stainless-steel materials and advanced sensing technology, it offers outstanding long-term stability and dependable operation in power generation, petrochemical, oil & gas, and other heavy industrial applications.
Product Details at a Glance
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330851-02-000-030-50-00-00 |
| Product Type | 3300 XL 25 mm Proximity Probe |
| Series | 3300 XL 25 mm Proximity Transducer System |
| Measurement Principle | Non-contact Eddy Current |
| Probe Case Type | M30 × 2 Thread |
| Unthreaded Length | 0 mm |
| Overall Case Length | 30 mm |
| Integral Cable Length | 5.0 m (16.4 ft) |
| Cable Type | 75 Ω FluidLoc Triaxial Cable |
| Armor Option | No Armor |
| Agency Approval | Standard / No Approvals |
| Probe Body 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 System | 3300 XL 25 mm Extension Cable & Proximitor Sensor |
| Primary Measurements | Shaft Position, Rotor Displacement, Differential Expansion |
| Dimensions | M30 × 2 Thread × 30 mm Overall Case Length |
| Weight | Approximately 0.23 kg |
Ideal Application Areas
The 330851-02-000-030-50-00-00 is designed for continuous condition monitoring in industries where machinery reliability is essential.
Typical applications include:
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Steam turbine supervisory instrumentation (TSI)
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Differential expansion monitoring
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Rotor displacement measurement
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Axial shaft position monitoring
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Industrial gas turbines
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Steam turbine generators
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Centrifugal compressors
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Turbo-expanders
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Power generation facilities
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Petrochemical processing plants
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Oil & gas production systems
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Refinery rotating equipment
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Heavy industrial manufacturing
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OEM machinery protection systems
Its extended 5-meter integral cable simplifies installation while maintaining excellent signal integrity across demanding industrial environments.
Product Advantages
Designed to maximize equipment reliability, the 330851-02-000-030-50-00-00 combines precision engineering with rugged industrial durability.
Key benefits
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Accurate non-contact eddy current sensing
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Compact 30 mm probe body for flexible installation
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5.0 m integral cable reduces installation complexity
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Wide 12.7 mm (500 mil) linear measurement range
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High-quality AISI 304 stainless-steel housing
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Durable PEEK sensing tip for long service life
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Stable performance under demanding operating conditions
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Fully compatible with Bently Nevada 3500 Series monitoring systems
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Supports predictive maintenance strategies
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Helps improve plant availability while lowering maintenance costs
Technical FAQs
1. What is the primary purpose of this proximity probe?
It is designed to monitor shaft displacement, axial position, and differential expansion on critical rotating machinery using non-contact eddy current technology.
2. Which transducer system is it compatible with?
It is part of the 3300 XL 25 mm Proximity Transducer System, consisting of the probe, extension cable, and matching Proximitor Sensor.
3. What does the "02" case option indicate?
The 02 configuration specifies an M30 × 2 threaded probe body, commonly used in metric installations.
4. What does the "030" code represent?
It indicates an overall probe case length of 30 mm.
5. What cable length is supplied?
This model includes a 5.0-meter (16.4-foot) integral FluidLoc triaxial cable.
6. Is the cable armored?
No. The 00 armor option designates a standard non-armored cable.
7. What is the operating temperature range?
The probe is rated for continuous operation from -35°C to +200°C, making it suitable for harsh industrial environments.
8. What is the measurement range?
The complete transducer 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 has an M30 × 2 threaded body, a 30 mm overall case length, and weighs approximately 0.23 kg.
10. Why is this model widely used?
Its combination of compact dimensions, extended cable length, high measurement accuracy, and proven reliability makes it an excellent solution for protecting critical rotating equipment in continuous operation.
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