These Green Air Products systems are a breakthrough in CO2 detection and control. The CDM-6000 monitor employs a passive infrared sensor and incorporates a photosensor to defeat CO2 during dark periods (Night). These sensors sample the air once every second and then sends the sample data to the CDDS-2 sequencer. The CDDS-2 then activates or deactivates your CO2 enrichment or venting (exhaust) equipment to maintain desired CO2 PPM. The CDDS-2 uses a sophisticated adaptive algorithm or “Overshoot Protection Logic” to learn the dynamics of the space being controlled. This allows the systems to avoid dramatic overshoots inherent to set point controllers or timed CO2 enrichment. These learned parameters are stored in the memory, even when the ‘POWER’ is off, or until you reset the unit. Set your desired CO2 level, ‘Hysteresis’ and ‘Elevation’ to maintain precise levels without guesswork.