The Dwyer CDT series CO2 transmitters are equipped with an NDIR (infrared) sensor. The transmitters are available in a wall-mounted version and in a version for duct mounting. Optionally, the transmitters are also available with a temperature output and SPST relay contact. Unique for this CO2 measurement is that it can also be used for rooms that are used 24 hours a day. Other sensors use the period when a room is not used to automatically correct the CO2 measurement. This can result in large deviations if rooms are used continuously. The CDTR series from Dwyer has no problems with that. Another unique point is that the CO2 sensor can be calibrated in the field and all at a very competitive price.
