  The liquid argon calorimeter is a key component of the ATLAS detector
installed at the CERN Large Hadron Collider. The primary purpose of this
calorimeter is the measurement of electrons and photons. It also provides a
crucial input for measuring jets and missing transverse momentum. An advanced
data monitoring procedure was designed to quickly identify issues that would
affect detector performance and ensure that only the best quality data are used
for physics analysis. This article presents the validation procedure developed
during the 2011 and 2012 LHC data taking periods, in which more than 98% of the
proton proton luminosity recorded by ATLAS at a centre-of-mass energy of 7 and
8 TeV had calorimeter data quality suitable for physics analysis.
