Displacement Chemical Regeneration (DCR) mode is an easy-to-use mode of operation for chemical suppressors. It eliminates the need for pressurized regenerant bottles or a regenerant pump. In this mode, the regenerant is displaced with conductivity cell effluent, delivering the regenerant to the suppressor at a flow rate equal to the eluent flow rate. At setup, the regenerant bottle is completely filled with regenerant. As the cell effluent is pumped into the regenerant bottle, the regenerant is forced out into the suppressor regen chambers (see the figure below). No additional pump or pressure is required. Eluent and regenerant bottles are of equivalent volumes and new regenerant is prepared when new eluent is installed. The low regenerant flow rate, which is equivalent to the eluent flow rate, minimizes waste and allows unattended operation, offering an economical option to the AutoRegen^® or pressurized bottle modes. 

DCR is a new technique for dispensing regenerant in the chemical regeneration mode of operation for the MicroMembrane suppressors including MMS III suppressor devices. The DCR mode uses the effluent from the conductivity cell to drive the regenerant into the regenerant chamber of the suppressor using a closed bottle configuration. The regenerant flow is equivalent to the eluent flow. Thus, continuous suppression is achieved without the use of an external regenerant pump. DCR is recommended for all carbonate applications, many hydroxide applications and most cation applications.