Which breath sample volume is necessary to ensure accuracy on the Intoxilyzer 9000?

The Intoxilyzer 9000 requires a minimum breath sample volume of at least 1.5 liters to ensure the accuracy of the results. This volume is necessary because the device uses infrared spectroscopy to measure the concentration of ethanol in the breath, and a sufficient amount of air is needed for proper detection and analysis.

By providing at least 1.5 liters of breath, the device is more likely to obtain a representative sample of the air in the lungs, where the alcohol concentration accurately reflects the individual's blood alcohol content. Using a sample smaller than this threshold could lead to skewed results due to insufficient data for analysis. Thus, adhering to the minimum volume ensures that the device operates within its calibrated and optimal range.