The A382 is composed of a CO2 Scrubbing Column filled with soda lime for removing CO2 from gases and a Drying Column, filled with DRIERITE for removing moisture from gases. Both of the columns are 60ml each and are included with the purchase of the CO2 analyzers (S151 and S153).
The CO2 Scrubbing column of A382 has a colored indicator to show when it is exhausted. The color change is subtle, and the purple coloration often does not persist, but appears as a band in the column at the junction between active and inactive soda lime.
The drying column of A382 has a colored (blue) indicator DRIERITE to shown when it is exhausted. The indicator turns pink when the DRIERITE is spent. When spent, the DRIERITE should be replaced or reconditioned. To recondition, remove the DRIERITE from the column and place it in a drying oven at 210oC for 1 hour, or until the pink coloration disappears.