Airflow Measurement

A Revolution for Today’s Healthy Buildings

Mechanical Ventilation For Adequate Indoor Air Quality by Ebtron (USA)

Typical BMCS – HVAC Applications: outdoor air delivery monitoring and control, differential airflow tracking for building /floor pressurisation control, airside economizer enthalpy switchover detection, supply air humidity monitoring and control.

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 often result in widely fluctuating outdoor air intake flow rates (± 40% is not uncommon) when airflow is not measured.

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 location and sensor node density has 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 probe
  • 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 < 2.5 m/s
  • Connectivity: BMCS using Modbus and BACnet including 0-10V voltage and 4-20mA current options depending on model selection

Technical Resources

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