Can it measure negative room airflow with GVDA GD155 Digital anemometer?
Answer: GVDA GD155 Anemometer is an anemometer that measures wind speed(wind velocity).
If you need to test negative air pressure and airflow in a room, you need to measure two things to judge, use a barometer to measures positive and negative air pressure, and use a TS-301 anemometer to calculate CFM.
You can use GD155 to test wind velocity in ft/m(Feet Per Minute) unit.
Calculation formula: * CFM (Q) = Wind Velocity in Feet Per Minute (V) x Duct Cross Sectional Area (A)
Do not confuse wind gusts with negative air pressure. Wind(Airlow) is air in motion. Air always moves from high pressure to lower pressure, and this movement of air is wind(Airflow). Airflow is the measure of the movement of air through a given space. Usually, airflow is measured in cubic feet per minute (cfm). Pressure is the force that drives air through a space. The device that measures the difference in air pressure is called a differential pressure sensor or manometer, use this tool tells positive and negative air pressure.
