Bently 330850-90-05

Technical Specifications

• Part Number: 330850-90-05
• Technology Type: Piezoelectric velocity transducer (absolute vibration measurement)
• Core Parameter: Vibration velocity (RMS); optional acceleration (g) and displacement (mm) outputs
• Measurement Range: 0 to 90 mm/s RMS (0 to 3.5433 in/s RMS)
• Frequency Response: 2 Hz to 1,500 Hz (±3 dB)
• Sensitivity: 100 mV/(mm/s) RMS (2.54 mV/(in/s) RMS) at 159 Hz (calibrated reference frequency)
• Output Signal: Balanced differential voltage; optional 4–20 mA DC or 0–10 V DC proportional to velocity
• Supply Voltage: 18–32 V DC (nominal 24 V DC)
• Power Consumption: ≤ 2.5 W at 24 V DC
• Integral Cable Configuration: 5 meters (16.4 feet) shielded twisted pair; FEP insulation, stainless steel armor option
• Operating Temperature Range: -40 °C to +125 °C (-40 °F to +257 °F)
• Storage Temperature Range: -55 °C to +150 °C (-67 °F to +302 °F)
• Mechanical Construction: Housing: Nickel-plated aluminum (hermetically sealed)
• Sensing Element: High-stability piezoelectric crystal with tuned seismic mass
• Cable Shielding: 95% coverage braided tinned copper (EMI/RFI protection)

Function Features

• Extended Measurement Range: The 0–90 mm/s RMS range caters to high-amplitude vibration scenarios, such as large rotating machinery (e.g., industrial turbines, heavy-duty compressors) and reciprocating engines, where smaller transducers may saturate.
• Integral Cable for Simplified Deployment: The pre-fabricated 5-meter cable eliminates loose connections, reduces installation time, and minimizes signal loss points. Its FEP insulation and braided shielding ensure durability and resistance to electromagnetic interference (EMI) from nearby electrical equipment.
• Absolute Measurement Versatility: Operates independently of target material, making it suitable for non-ferromagnetic shafts (aluminum, composites) and equipment where proximity transducers are incompatible. This flexibility eliminates the need for application-specific transducer selection.
• Broad Frequency Coverage: The 2–1,500 Hz frequency response captures low-frequency structural vibrations (e.g., foundation resonance at 2–50 Hz) and high-frequency component faults (e.g., bearing defects at 500–1,500 Hz), providing comprehensive machinery health insights.
• Extreme Environmental Durability: The IP68 rating enables submersible operation, while the nickel-plated aluminum housing resists corrosion from saltwater, chemicals, and industrial fluids. It operates reliably across a wide temperature range, making it suitable for harsh environments like offshore platforms and mining sites.
• High Precision & Stability: The piezoelectric crystal delivers consistent 100 mV/(mm/s) sensitivity with minimal temperature drift, ensuring ±1.5% accuracy across all operating conditions. The 0.005 mm/s resolution detects subtle vibration changes, enabling early fault diagnosis.
• Robust Mechanical Resilience: Withstands 1,000 g peak shock, making it durable for high-impact applications (e.g., mining crushers, construction equipment). The reinforced cable-connector junction prevents damage from cable tugging or mechanical stress during installation.
• Seamless System Integration: The pre-terminated M12 connector mates directly with Bently Nevada 3300 XL monitoring racks and transmitters. It also integrates with third-party DCS, SCADA, and predictive maintenance software via standard analog outputs, adapting to existing industrial control systems.
• Multi-Parameter Output Option: Optional signal conditioning converts velocity data to acceleration or displacement, providing versatile monitoring metrics without additional transducers—simplifying system design and reducing costs.

Application Scenarios

• Power Generation (Large Turbines): Installed on steam and gas turbines in thermal, nuclear, and combined-cycle power plants. It monitors bearing and casing vibration to detect rotor imbalance, misalignment, or blade damage—critical for preventing turbine failure and power grid disruptions.
• Oil & Gas Offshore Operations: Deployed on offshore drilling rigs, subsea pumps, and platform compressors. The IP68 rating and corrosion resistance withstand saltwater exposure, while the extended range handles high-amplitude vibration in large compressors.
• Mining & Heavy Industry: Applied to crushers, grinding mills, and conveyor system drives. The shock resistance and dustproof design endure the high-impact, high-dust environment, ensuring continuous monitoring of equipment critical to mineral processing.
• Petrochemical Refining: Used on catalytic crackers, hydrocrackers, and large centrifugal pumps. It resists exposure to hydrocarbons and solvents, providing reliable vibration data for equipment handling flammable and corrosive materials.
• Marine Propulsion Systems: Installed in ship engines, propeller shafts, and auxiliary pumps. The submersible IP68 rating and saltwater corrosion resistance make it suitable for marine environments, while the integral cable simplifies installation in tight engine rooms.
• Cement & Aggregates Production: Deployed on kiln drives, ball mills, and induced-draft fans. It operates in high-temperature, dusty conditions, tracking vibration to prevent unplanned downtime in continuous-production cement plants.
• Chemical & Pharmaceutical Manufacturing: Monitors large mixers, agitators, and centrifuges. The hermetic sealing prevents contamination, complying with strict hygiene standards, while the wide frequency range captures vibration from slow to high-speed equipment.
• Construction & Heavy Equipment: Used on diesel engines, hydraulic pumps, and excavator drives. The robust shock resistance and durable construction withstand the harsh operating conditions of construction sites, ensuring equipment reliability.