Versatile Bio Sensor Guide: Respiratory airflow

Understanding the respiratory airflow sensor on the Versatile Bio


What it measures:

The airflow sensor (MAF) measures temperature changes in breathed air in order to measure inhaled and exhaled breaths. 

Research Applications:

Sports, rehabilitation, kinesiology, psychology, biomechanics, etc.

How to use:

The sensor has to be placed on the upper lip, between the nostrils and the mouth.  This can be used on adult and pediatric participants.  



How to clean:

Clean the wiring, body and sensor ends with mild soap and water. Avoid getting the connectors wet.  Allow the senors and all wiring to dry completely before use.

Autoclave is not recommended.

Connector on Versatile Bio:

Analog AUX

Visualization filters:

Right-click on wave view in Bitbrain Device Viewer to view data-visualization filter settings.

Under "Notch-Filter" we recommend setting this to the preset matching your country's AC frequency (presets exist for USA/Japan at 60 Hz, and Europe at 50 Hz).

Under "Other Filter" click "enabled"
Set filter type to "Bandpass"
Set High (Hz) to 10 Hz
Set Low (Hz) to 0.1 Hz
Type is "Butterworth"
Order set to 4


Data file:

Output: µV
Output Bandwidth: 0.16 Hz - 15 Hz

Output data is reported in microvolts and is relative to the temperature recorded during inhalation and exhalation.  Inhaling will cause a voltage decrease, while exhaling will cause a voltage increase. 

Absolute voltage amplitude and signal strength can vary considerably based on sensor placement, airflow, posture, ambient temperature, CPAP pressure, etc.