CleanAir® designed this mobile FTIR system to sample unattended for extended durations. Data can be accessed remotely via a cellular modem or ethernet conection. An autofill system for the liquid nitrogen cooled detector can be included, which provides up to 1 week of LN2. Automatic calibration checks are controlled with an ESC datalogger. The temperatures of all of the sample delivery system are monitored as well. If a power outage or problem occurs then the sample will bypass the FTIR.