What does a green Breath Flow Bar indicate during a breath test?

A green Breath Flow Bar during a breath test indicates that the subject is blowing hard enough for the Intoxilyzer 9000 to accurately measure the breath alcohol content. The device uses the Breath Flow Bar as a visual aid to guide the subject in providing an effective sample. When the bar is green, it signifies that the airflow is within the optimal range for detection; this is crucial because both insufficient airflow and excessive force can lead to inaccurate test results.

The instrument needs a steady and adequate breath sample to correctly measure the concentration of alcohol in the breath. If the bar did not indicate this optimal range, it could compromise the integrity of the test or reflect a potential issue with the breath sample provided. Understanding the function of the Breath Flow Bar enables effective administration of breath tests, ensuring more reliable outcomes in the assessment of alcohol levels.