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Thaaank you for your help .I will test this solution starting next monday when we have a halt of production. I ll give feedback of the results.

Yes that can most definitly work and give me the air speed value ( bear with me here ) but how do i convert that air speed value to the appropriate fan rotation speed value so that the cpu (api) sends the right signal to the frequency converter to finally get through the motor the new air speed desired . It seems to me that even if i have the air speed value im gonna still need the connection between it and the rotation speed of the fan . First of all thank you very much for replying Im currently working on something right now it ll take a minute. as soon as i check it out im gonna get back to you if i find what i was looking for .

i need to regulate the air flow into an industrial oven ,and to do so : i have an asynchronous motor which i will connect to a frequency converter (excuse my english if i dont use the correct technical terms i studied and work in a french country ) and then regulate the speed of which the ventilator rotates .and this is where i need help i need to find the connection or the equation between the rotation speed of the propellers and the speed of air that s being propelled so that i multiply the latter by the section of the airway and finally regulate the air flow . ps : i know i can just use a sensor to calculate the airflow and regulate it directly but that is not the purpose of this post . also i have the measurements of the propellers ,i know that will be needed i juts fail to find the right equation to use. thanks for your help in advance