The CD-3xx-E00-00 series is a wall mount transmitter for measuring the CO2 levels, the relevant humidity and the temperature within Heating, Ventilation and Air Conditioning applications. The CD-3xx series incorporates a single beam dual wavelength NDIR CO2 sensor, which compensates for ageing effects, is highly insensitive to pollution and offers outstanding long term stability. A multiple point CO2 and T factory adjustment procedure leads to excellent CO2 measurement accuracy over the entire T working range. The CD-3xx room sensor are designed to work as part of any HVAC control system. This new CO2 transmitter is easy to install and requires no maintenance or field calibration. Feature: Power Supply 15...35 VDC / 24 VAC 0…10V CO2 and Relative Humidity Output 0…10V and Pt1000 Temperature Output on the same device Models with Display Snap-on Enclosure Outstanding long-term stability CO2 Factory Calibration Certificate