Airflow Measurement

A Revolution for Today’s Healthy Buildings

Effective Ventilation for Adequate Indoor Air Quality by Ebtron (USA)

Get the Basics Right

Whenever the outdoor air ventilation rates are modulated, use of airflow measurement needs to be considered as dampers are not linear flow devices. External variations in wind and stack effect will also result in widely fluctuating outdoor air intake flow rates when airflow is not measured and controlled.

Airflow measurement can also be used to set limits, such as the building component or the maximum capacity of the mechanical equipment.

Direct airflow measurement can also provide better tracking of ventilation rates, room air changes and verification that minimum ventilation is achieved. Since air velocities vary across the traverse of an intake or duct, sensor probe location and node density have a significant impact on measurement accuracy.

Benefits of Ebtron Thermal Dispersion

  • Higher accuracy and repeatability: 0.25 to 25 m/s with an installed accuracy from ± 3% to ± 15% depending on model selection and placement of probes
  • Avoidance of issues: associated with traditional differential pressure transducers and pitot tubes e.g., longer straight sections of duct, long term stability, and poor accuracy at low velocities
  • Connectivity: Modbus, BACnet, 0-10V and 4-20mA options depending on model selection

BMS Applications: outdoor air delivery monitoring and control, flow tracking for building /floor pressurisation control, economiser enthalpy switchover detection, supply air humidity monitoring and control.

Indoor Air Quality Fundamentals – Flow Tracking Control System. Image courtesy of Ebtron.

Technical Resources

Talk to an Expert

If you have been considering airflow measurement, we would be happy to discuss your project requirements and options.

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