![](http://www.airpointer.tech/wp-content/uploads/2019/04/permtube_edited.jpg)
Hello everybody,
Because several people asked me during the training, below is an excel file calculating the concentration of a perm tube using the permeation rate and the flows, and converting the concentration from micrograms per cubic meter into ppb:
https://www.airpointer.tech/permeation-tubes/
Regards,
Kevin.