These Green Air Products systems are a breakthrough in CO2 detection and control. The CDMC-6 system is designed to sample the air and learn the characteristic of your space, then make adjustments as necessary to ensure a constant level of CO2. The CDM-6000 monitor employs a passive infrared sensor which samples 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. The CDMC-6 system offers a large LCD screen displaying the current CO2 levels in PPM. Set your desired CO2 level, Hysteresis and Elevation to maintain precise levels without guesswork. The CDMC-6 system can be using for enriching or venting CO2 and incorporates a photosensor to defeat CO2 during dark periods (Night).The CDMC-7 system functions like the CDMC-6 for CO2 enrichment or ventilation, but offers the added features of a portable monitor in the CDM-7001 with dual beam absorption infrared technology and a LCD display that shows CO2 PPM and real time temperature. The CDM-7001 monitor is also equipped with a computer interface to download CO2 history. Recorded data can be graphed and printed using a Windows based VG graphing software (not included).