Bently 330780-91-05

Technical Specifications

• Part Number: 330780-91-05
• Technology Type: Eddy-current (inductive) proximity sensing
• Probe Diameter: 11 mm (0.433 inches)
• Linear Measurement Range: 0 to 4 mm (0 to 0.1575 inches)
• Integral Cable Configuration: 5 meters (16.4 feet) shielded cable with pre-terminated connector
• Operating Frequency Range: 0 to 10,000 Hz (covers static to high-frequency dynamic measurements)
• Output Signal: 4–20 mA DC (analog, proportional to displacement); optional 0–10 V DC output available
• Supply Voltage: 18–32 V DC (nominal 24 V DC)
• Power Consumption: ≤ 1.5 W at 24 V DC
• Operating Temperature Range: Probe Body: -51 °C to +177 °C (-60 °F to +351 °F)
• Cable Assembly: -40 °C to +125 °C (-40 °F to +257 °F)
• Termination Connector: 0 °C to +65 °C (32 °F to +149 °F)

Function Features

• Extended Linear Measurement Range: The 11 mm probe diameter delivers a 0–4 mm linear range, 2x wider than 8 mm variants, making it ideal for machinery with larger expected shaft movements—such as turbines with thermal expansion or pumps with axial float.
• Integral Cable for Enhanced Reliability: The pre-fabricated 5-meter cable eliminates loose connections and reduces installation complexity. Fewer components mean lower failure risk, while the braided copper shield ensures 90% EMI/RFI coverage, preventing signal interference from nearby motors, generators, or power cables.
• Extreme Environmental Resilience: AISI 316 stainless steel housing resists corrosion from saltwater, chemicals, and industrial solvents, while the FEP cable insulation withstands abrasion, high temperatures, and exposure to oils and coolants. The IP67 rating ensures operation in dusty, wet, or humid environments without performance degradation.
• High-Precision, Low-Drift Performance: Advanced eddy-current circuitry minimizes temperature-induced drift, maintaining ±1% accuracy across the entire operating temperature range. The 0.002 mm resolution captures subtle vibrations and position changes, enabling early detection of bearing wear, shaft misalignment, or rotor imbalance.
• Broad Frequency Coverage: The 0–10,000 Hz frequency response captures both static position (0 Hz) and dynamic vibrations, including high-frequency bearing faults (2,000–10,000 Hz) and low-frequency structural resonance (10–100 Hz), making it versatile for diverse machinery types.
• Plug-and-Play Compatibility: The proprietary bayonet connector mates seamlessly with Bently Nevada 3300 XL monitoring racks, transmitters, and signal conditioners. It also integrates with third-party DCS and SCADA systems via standard 4–20 mA analog output, reducing integration time for existing setups.
• Diagnostic Capabilities: Built-in self-monitoring detects cable faults, open circuits, or power supply issues, triggering alerts via the connected monitoring system. This allows maintenance teams to troubleshoot the transducer itself, avoiding misdiagnosis of machinery problems.
• Long Service Life: Industrial-grade components and rigorous quality testing (including temperature cycling, vibration, and corrosion resistance tests) ensure a operational lifespan of 10+ years in typical industrial environments, lowering total cost of ownership.

Application Scenarios

• Power Generation: Critical for monitoring steam turbines, gas turbines, and generators in thermal, nuclear, and combined-cycle power plants. It tracks axial position to prevent rotor rubs, differential expansion in turbines, and vibration in generator shafts—protecting equipment worth millions and avoiding power outages.
• Oil & Gas Upstream/Midstream: Deployed on offshore drilling rigs, subsea pumps, and pipeline compressors. The corrosion-resistant design withstands saltwater and hydrocarbon exposure, while the extended measurement range accommodates axial movement in large compressors.
• Refining & Petrochemical: Used to monitor catalytic crackers, centrifugal pumps, and gearboxes in refineries and petrochemical plants. It resists exposure to solvents, fuels, and high temperatures, ensuring reliable data for equipment handling hazardous materials.
• Marine & Naval Engineering: Installed in ship propulsion systems, marine diesel engines, and offshore platform machinery. The IP67 rating and saltwater resistance make it suitable for harsh marine environments, while the compact design fits in tight engine rooms.
• Metallurgy & Heavy Industry: Applied to rolling mill motors, blast furnace fans, and grinding mills in steel and aluminum plants. It withstands high dust levels, extreme temperatures, and heavy vibration, monitoring equipment critical to continuous production.
• Aerospace & Defense: Used in aircraft engine test stands, ground support equipment, and military vehicle powertrains. The high precision and reliability meet strict defense standards, ensuring safe operation of mission-critical systems.
• Water & Wastewater Treatment: Monitors large centrifugal pumps and blowers in treatment plants. The corrosion-resistant design handles wet, chemical-rich environments, while the integral cable simplifies installation in confined pump rooms.