5.1 The following sections describe as integrated, modular flue-gas sampling apparatus for collection of H2SO4 by the condenser method and collection of SO2 in impingers.
The description given here assumes a 47 mm filter, sampling rate of 12 L/min and 250 ml capacity impingers. For a 25 mm filter, sampling rate of 1 L/min and 25 ml impingers, the 18/9 standard ball/socket joints described below should be replaced with 12/5 standard ball/socket joints.