The CDD4 Series CO2 monitor uses highly accurate and reliable dual wavelength Non-dispersive Infrared (NDIR) sensor with LTA (long term adjustment) signal processing technology to deliver industry leading long-term accuracy and reliability. It is housed in an attractive, low profile enclosure for room applications to detect CO2 levels and provides a linear analog signal output of 4-20 mA, 0-5 or 0-10 Vdc signals. The CDD4 is available with ranges of 0-2000 ppm or 0-20,000 ppm (Dual-wavelngth). Parameters are set up via the LCD display which can be provided as viewable or concealed. Various precision thermistors or RTD’s are also available to as an optional temperature output.