Function block inputs

[I0] Standard volume flow rate gas [m³/h (at STP)]

Analog channel

[I1] Primary air speed [m/s]

Analog channel

[I2] Lambda

Analog channel

[I3] Factor primary air

Fixed value

[I4] Radius primary air tube [m]

Fixed value

[I5] Specific stoichiometric air requirement [m³/m³ (at STP)]

Fixed value

Function block outputs

[Q] Primary air content (gas) [Vol.-%]]

Q = (I3 x Pi x I4 x I4 x I1 x 360000 ) / ( I2 x I5 x I0 )