Reliability: Ambient Conditions
Tip 41: Changing breath room ambient conditions can reduce "system calibration check" and "system blank test" reliability. Any infrared-based approved instrument such as the Intoxilyzer® 8000C has no true zero. Zero floats up and down depending on, inter alia, the environment of the breath room and the sample chamber. Adding some ethyl alcohol to the room air affects the air sucked into the breath tube and then into the sample chamber during an air blank. Zero needs to be re-