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Gas-Phase Measurement Instruments 69 Instrument Full name or descripon What is being measured? CO2 LI COR Non dispersive infrared gas analyzer for carbon dioxide Carbon dioxide (gas phase inlet) TILDAS (N2O Mini) Tunable infrared laser direct absorpon spectroscopy Nitrous oxide, carbon monoxide, water TILDAS (CH4 Dual) Tunable infrared laser direct absorpon spectroscopy Methane, methane isotopes, sulfur dioxide, acetylene TILDAS (C2H6 Mini) Tunable infrared laser direct absorpon spectroscopy Ethane TILDAS (HCHO Dual) Tunable infrared laser direct absorpon spectroscopy Formaldehyde, ethene NOx Box Thermo Scienfic chemiluminescence NOx analyzer Nitrogen oxides (NOx = NO + NO2) NOx Box Thermo Scienfic chemiluminescence NOx analyzer In NO mode only Nitric oxide (NO) CAPS NO2 Cavity aenuated phase shi spectroscopy Nitrogen dioxide (NO2) HFID Heated flame ionizaon detecon ofhydrocarbons unburned and parally combusted hydrocarbons (HC) PID Photoionizaon detector for volaleorganic hydrocarbons Volale organic hydrocarbons (VOC) PTR MS Proton transfer reacon massspectrometry Acetaldehyde, 1,3 butadiene, acrolein, propanal, benzene, toluene, sum of xylenes and ethylbenzene, naphthalene, other VOCs Table G-1. Gas phase instrument manifest.