What does a yellow indication on the Breath Flow Bar signify?

A yellow indication on the Breath Flow Bar signifies that the subject's breath flow is inadequate. This visual cue is crucial during the administration of the breath test, as the Intoxilyzer 9000 requires a steady and sufficient flow of breath to obtain an accurate measurement of blood alcohol content. When the Breath Flow Bar displays a yellow indication, it alerts the operator that the subject's exhalation is not meeting the necessary criteria for the test, and may indicate that they are not providing an adequate sample size or that the breath is not being exhaled consistently. Addressing this issue is essential for ensuring that the test can proceed effectively and yield reliable results.