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Observator 100 years

8455, 8465 & 8475

The Air Velocity Transmitters are used to measure air speed in research and development rooms, production processes and many other applications. For both temporary and permanent installations. The full–scale range, signal output, and time constant are user selectable and can be easily changed to meet the needs of your application.

Additional documents


  • Comfort and draft studies
  • Critical environment installations (e.g., clean rooms and hospitals)
  • Diffuser design analysis
  • Monitoring drying processes
  • Monitoring air flows in tunnels and subways
  • Used as a standard in wind tunnels and calibration facilities
  • Environmental monitoring in greenhouses and IAQ applications
  • General engineering applications


General Purpose (8455)

  • Protected probe tip
  • Rugged ceramic sensor
  • Wide range of measurement applications
  • Fast response time


Windowless (8465)

  • Less flow blockage
  • Ideal for measuring in confined spaces
  • Fast response time


Omnidirectional (8475)

  • Omnidirectional probe tip
  • Accurate at low velocities from 10 to 100 ft/min (0.05 to 0.5 m/s)
  • Ideal for unknown or varying flow direction

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