1 reply to this topic

[aliveinmoscow]

I have to mix 2 gases, Hydrogen and Nitrogen to achieve a constant flow of mixed gas with 100, 200... 1000 ppm of H2 in the mixture.

I have mass flow meters to adjust the flow of each individual gas but how do I determine what they should read to achieve each of the desired ppm combinations

[breizh]

Hi ,

Let you do a mass balance or mass flow balance :

* Assuming you are talking PPM mass ( part per million mass) then as an example :

a) let say 1oo ppm : 1e-4 = Mass flow H2/ (Mass flow N2 +Mass flow H2)
the second equation is the mass flow of N2 you will fix .
then you can calculate the flow rate of H2


Hope this helps
Breizh