How does the Intoxilyzer 8000 determine the end of a valid breath sample?

The Intoxilyzer 8000 determines the end of a valid breath sample primarily by assessing the breath flow and volume. This method ensures that the sample is not only adequate in volume but also of sufficient quality for accurate alcohol concentration analysis. Specifically, the device analyzes the flow of breath to ensure it meets certain criteria, such as maintaining a consistent flow rate over a specified volume.

If the flow is too low or inconsistent, the device cannot ensure that the sample is representative of the person's breath alcohol content, which is crucial for accurate measurement. This focus on flow and volume helps to eliminate invalid samples and reduces the likelihood of error in readings, thus enhancing the reliability of the results.

While other factors such as temperature or duration may play a role in the sampling process, they do not directly determine the conclusion of a valid sample in the same way that flow and volume do.