Bently 330876-03-90-00-05

Technical Specifications

• Part Number: 330876-03-90-00-05
• System Type: Non-contact eddy-current displacement transducer system (probe + integral cable)
• Measurement Parameter: Shaft displacement, axial position, differential expansion, rotor vibration
• Measurement Range: 0–90 mm (0–3.543 inches) linear range
• Probe Diameter: 30 mm (1.181 inches)
• Integral Cable Specifications: Length: 5 meters (16.4 feet)
• Insulation: FEP (Fluorinated Ethylene Propylene) – chemical and oil resistant
• Shielding: Double-layer braided tinned copper (98% coverage for EMI/RFI protection)
• Connector: Bently Nevada proprietary 8-pin bayonet connector (pre-terminated)

Function Features

• Extended Linear Measurement Range: The 0–90 mm linear range caters to large-scale shaft movements, such as those in industrial turbines, large compressors, and hydroelectric generators—where thermal expansion or axial float exceeds the capabilities of smaller transducers. This eliminates the need for multiple sensors and simplifies system design.
• Integral Cable for Enhanced Reliability: The pre-fabricated 5-meter FEP-insulated cable eliminates loose connections and reduces installation complexity. Double-layer copper shielding ensures 98% EMI/RFI protection, preventing signal interference from nearby motors, generators, or power cables—critical for accurate displacement measurements.
• Non-Contact, Wear-Free Operation: Eddy-current technology enables measurement without physical contact with the shaft, eliminating wear on both the sensor and the machinery. This ensures consistent performance over a long operational lifespan, even in high-speed applications (up to 30,000 RPM) common in gas turbines.
• Corrosion-Resistant Construction: AISI 316 stainless steel probe housing resists corrosion from saltwater, industrial chemicals, and harsh weather conditions, making it suitable for offshore, marine, and chemical processing environments. The hardened ceramic probe tip adds extra durability against accidental impact.
• High Precision & Low Drift: ±0.5% accuracy and 0.01 mm resolution capture subtle shaft movements, enabling early detection of issues such as misalignment, bearing degradation, or rotor imbalance. Advanced circuitry minimizes temperature-induced drift, ensuring reliable measurements across the entire operating temperature range.
• Broad Frequency Response: The 0–5,000 Hz frequency range covers both static position (0 Hz) and dynamic vibration (up to 5,000 Hz), making it versatile for monitoring both slow-speed and high-speed machinery. It captures low-frequency structural vibrations and high-frequency bearing faults with equal reliability.
• Secure Mating & Integration: The proprietary 8-pin bayonet connector mates seamlessly with Bently 3300 XL monitoring racks and signal conditioners, ensuring a water-tight, vibration-resistant connection. It also integrates with third-party DCS and SCADA systems via optional 4–20 mA output, adapting to existing industrial control architectures.
• Extreme Environmental Resilience: The probe operates reliably in temperatures ranging from -51 °C to +177 °C, making it suitable for cryogenic applications and high-heat environments such as turbine casings. The IP67 rating ensures protection against dust and temporary water immersion, extending operational versatility.
• Easy Calibration & Maintenance: The transducer is pre-calibrated at the factory for AISI 4140 steel targets, requiring minimal on-site adjustment. Bently Nevada’s configuration software enables quick recalibration for other ferromagnetic materials, reducing maintenance time and complexity.

Application Scenarios

• Power Generation (Large Turbines): Installed on steam turbines, gas turbines, and hydroelectric generators to monitor axial position, differential expansion, and shaft vibration. The extended 90 mm range accommodates thermal expansion in large turbines, preventing rotor rubs and catastrophic failures.
• Oil & Gas (Offshore & Refining): Deployed on offshore drilling rigs, subsea pumps, and refinery compressors. The corrosion-resistant stainless steel housing withstands saltwater and hydrocarbon exposure, while the integral cable simplifies installation in tight platform spaces.
• Hydroelectric Power: Used in hydroelectric generator units to monitor runner shaft displacement and thrust bearing position. The non-contact design eliminates wear on large, slow-speed shafts, ensuring reliable performance in wet, humid environments.
• Metallurgy & Heavy Industry: Applied to rolling mill motors, blast furnace fans, and large gearboxes in steel and aluminum plants. The extended range handles axial movement in heavy-duty machinery, while the rugged construction withstands high dust levels and extreme temperatures.
• Marine & Naval Systems: Installed in ship propulsion systems, marine diesel engines, and offshore platform machinery. The IP67 rating and saltwater corrosion resistance make it suitable for harsh marine environments, while the 5-meter cable fits in compact engine rooms.
• Chemical & Pharmaceutical Manufacturing: Monitors agitators, centrifuges, and reactor shafts in chemical plants. The stainless steel housing resists exposure to solvents and acids, complying with strict safety and hygiene standards.
• Renewable Energy (Wind Turbines): Deployed on wind turbine main shafts and gearboxes. The non-contact design and extended range monitor shaft displacement caused by wind loads, ensuring reliable operation in remote wind farm locations.
• Mining & Minerals Processing: Used on large crushers, grinding mills, and conveyor system drives. The robust construction and EMI shielding withstand high vibration and dust, providing accurate data for equipment critical to continuous production.