Description
1. Product Title
Bently Nevada 330851-02-000-050-90-00-CN – 3300 XL 25mm Eddy Current Proximity Probe for Turbine Differential Expansion Measurement
2. Product Overview
The 330851-02-000-050-90-00-CN is a heavy-duty 25mm large-diameter non-contact eddy current proximity probe belonging to Bently Nevada’s 3300 XL transducer family, primarily engineered for differential expansion (DE) measurement on large steam turbines and heavy rotating equipment. It operates on the eddy current induction principle to capture the thermal expansion gap difference between turbine rotors and stationary casings, as well as ultra-long-stroke axial thrust displacement and rotor eccentricity data without physical contact and mechanical wear. This full-assembly probe comes with a factory fixed 9-meter triaxial shielded cable and non-armored structure, forming a complete 75-ohm impedance-matched measurement loop with dedicated 3300 XL 25mm proximitor modules. The high-temperature resistant stainless steel housing and sealed FluidLoc connector design of 330851-02-000-050-90-00-CN withstand extreme heat, oil mist, steam condensation and severe electromagnetic interference inside turbine enclosures, delivering linear, drift-free analog signals to 3500 monitoring racks and plant DCS systems to prevent catastrophic turbine over-expansion failures and unplanned unit trips.
3. Technical Specifications
- Brand: Bently Nevada
- Model: 330851-02-000-050-90-00-CN
- Warranty: One Year
- Condition: 100% New & Original
- Series: 3300 XL 25mm Large Range Proximity Transducer System
- Full Model Suffix Breakdown:
- 02 = M30×2 external mounting thread
- 000 = Zero unthreaded probe body segment
- 050 = 50mm total probe housing length
- 90 = 9 meters (29.5ft) factory integrated cable length
- 00 = Non-armored cable construction
- CN = China regional compliance certification
- Probe Sensing Diameter: 25mm
- Effective Linear Measurement Range: 12.7 mm (500 mils)
- Standard Sensitivity: 0.787 V/mm (20 mV/mil)
- Loop Impedance: 75 ohm triaxial calibrated system impedance
- DC Resistance (9m cable): 8.8 Ω ±1.1 Ω
- Probe Head Operating Temperature: Continuous up to +200°C, short-term peak +250°C
- Cable Temperature Rating: -52°C to +177°C
- Housing Material: AISI 304 corrosion-resistant stainless steel
- Probe Tip Material: High-temperature PEEK engineering plastic
- Cable Insulation: PFA fluoropolymer triaxial fully shielded cable
- Connector Type: Sealed FluidLoc locking coaxial connector
- Installation Torque: Recommended 68 N·m for M30×2 thread
- Net Weight: Approximately 230g
- Compliance: Fully complies with API 670 machinery protection standard
4. Application Scenarios
- Thermal Power Plant Steam Turbine Generators: The core application for measuring rotor-to-casing differential thermal expansion, axial thrust bearing position and rotor axial float on large utility steam turbines, forming the primary protection against turbine rub and over-expansion damage.
- Petrochemical & Oil & Gas Heavy Turbo Machinery: Installed on large industrial gas turbines and heavy-duty process turboexpanders to monitor long-travel axial displacement and casing thermal growth in high-temperature, hazardous explosive environments.
- Heavy Industrial Compressor Skids & Cogeneration Units: Deployed on large multi-stage centrifugal compressors and waste heat recovery turbine systems for precise differential expansion monitoring and safety interlock trip logic execution.
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