| 摘要 |
A method for determining the gas content of a person's breathing air, comprises, first determining when the breathing air is at a condition in which best testing results will be effected. This is done by arranging a capacitor in a breathing tube through which the breathing air is directed. The capacitor is first heated to a predetermined temperature and the breathing air is directed over it so as to cool it until it has attained a predetermined temperature change. This temperature change is such that it will take place when the person's breathing air has its desired constituency. When this occurs, the breathing air is then directed into a test chamber in which it is tested to determine the constituency of the breathing air particularly the percentage of alcohol which it contains. A device for testing a person's breath in addition to the tube through which the breath is directed containing the thermal capacitor also contains a test chamber which is connected to the tube with control means which senses the temperature of the capacitor and permits the flow of the gas into the test chamber only after a predetermined temperature drop has taken place. |
