This is done by taking a small fraction of the dilution air whose flow rate has already been measured with the flow measurement device FM1, and feeding it to TT by means of a pneumatic orifice.
Selleks võetakse väike osa lahjendusõhust, mille voolukiirus on juba kindlaks määratud voolumõõturi FM1 abil, ning juhitakse see pneumaatilise ava kaudu ülekandetorusse TT.