https://www.ics-schneider.de/sf%E2%82%86-gasraum-vor-dem-befuellen-evakuieren-restluft-vakuumniveau-und-gasqualitaet-richtig-kontrollieren/?lang=en
Evacuating an SF₆ Gas Compartment Before Filling: Correctly Controlling Residual Air, Vacuum Level...
Oct 1, 2026 - If an SF₆ gas compartment has been opened for installation, repair or maintenance work, ambient air will subsequently be present inside it. This air consists...
residual airvacuum levelevacuatinggascompartment