Bently Nevada 9200 & 74712 Series

The Bently Nevada 9200 and 74712 series are both Seismoprobe Velocity Transducer Systems designed for measuring absolute (relative to free space) bearing housing, casing, or structural vibrations in industrial environments. Here are the key features and differences between these two series:

Bently Nevada 9200 Series:

• Temperature Range: Suitable for temperatures ranging from -29°C to +121°C (-20 °F to +250°F).
• Features:
  • Sensitivity: 20 mV/mm/s (500 mV/in/s), ±5% when properly terminated and oriented at the angle of calibration. Transverse sensitivity is 10% or less of axial sensitivity.
  • Frequency Response: Operates between 4.5, 10, or 15 Hz up to 1 kHz (60,000 cpm); +0, -3dB typical.
  • Mechanical Shock Resistance: Can withstand mechanical shocks up to 50 g peak along the non-sensitive transverse axis.
  • Technology: Moving-coil transducers, less sensitive to impact excitation compared to integrating accelerometers.
  • Power Requirement: No external power needed, making them suitable for portable measurements.

Bently Nevada 74712 Series:

• Temperature Range: High-temperature version, qualified for temperatures from -29°C to +204°C (-20 °F to +400°F).
• Features: Generally similar to the 9200 series but designed to operate in higher temperature environments, expanding its applicability in industrial settings where temperatures can be more extreme.

Common Features:

• Both series offer:
  • High sensitivity with specific calibration requirements.
  • Broad frequency response suitable for detecting a wide range of vibrations.
  • Robustness against mechanical shocks along the non-sensitive axis.
  • Dependable performance without requiring external power sources, enhancing versatility in measurement scenarios.

Applications: These velocity transducers are particularly useful for monitoring vibrations in machinery where temperature variations are significant, such as turbines, pumps, compressors, and other critical industrial equipment. Their design and capabilities make them ideal for both stationary monitoring and portable measurement tasks, contributing to effective predictive maintenance and operational safety in industrial operations.