What is the minimum breath flow rate indicated on the display of the instrument?

The minimum breath flow rate indicated on the display of the Intoxilyzer 9000 is essential for ensuring that a valid sample is collected for analysis. A breath flow rate of 0.15 L/sec is the threshold that indicates adequate airflow to obtain an accurate representation of a person’s blood alcohol concentration. This flow rate is significant because it helps ensure that the sample taken during the testing process is representative of the breath alcohol level.

Flow rates that are below this minimum threshold may lead to improper sampling or inaccurate readings, as they could suggest that the sample being drawn is not sufficient or is contaminated. The choice of 0.15 L/sec is set based on the calibration and operational standards needed for reliable test results, which are critical in legal and safety contexts.