What is the purpose of a Dry Cal Chk in the Intoxilyzer 9000?

The purpose of a Dry Cal Chk in the Intoxilyzer 9000 is to calibrate the instrument using a gas standard. This process involves using a precise reference gas with a known alcohol concentration to ensure that the instrument's measurements are accurate. Calibration is critical because it helps maintain the integrity of the data collected by the device, ensuring that the results of breath alcohol tests are reliable and consistent. By verifying the device's measurement capability against a known standard, it is possible to determine if the Intoxilyzer 9000 is performing correctly and to make any necessary adjustments to maintain its accuracy. This is a vital step in the overall quality assurance process for breath alcohol testing systems.