What is a control solution used in the calibration of the Intoxilyzer 9000?

A control solution is essential in the calibration process of the Intoxilyzer 9000 because it is a liquid with a known alcohol concentration that allows for the verification of the accuracy of the device's readings. During calibration, this solution is analyzed by the device to ensure that it responds correctly and provides accurate blood alcohol concentration readings. When the device registers the expected value of the control solution, it demonstrates that the system is functioning properly. If it does not match, adjustments or maintenance may be necessary to ensure reliability during actual breath testing.

The other options do not accurately describe a control solution. A liquid that detects only low levels of alcohol concentration would not serve the purpose needed for calibration across a range of concentrations. A breath sample is typically what is analyzed to determine a person's blood alcohol concentration rather than being a type of control solution. Lastly, a device that measures the temperature of the breath sample pertains to maintaining specific conditions for testing but is unrelated to the calibration of the Intoxilyzer with a control solution.