Breathalyser Training Device, c1970s
This French made Breathalyzer was used for training purposes in a time when Breath testing technology was revolutionizing road policing in Victoria. The clear sides of the box allowed trainees to understand how the device worked.
Alcohol is absorbed in the digestive system into the blood stream. As blood circulates through the lungs, alcohol moves across the lungs air sacs (alveoli) and into the air. The Breathalyzer analyses the level of alcohol in the alveolar air, which is representative of the person’s blood alcohol content (BAC).
When the breath enters the sample chamber, alcohol present reacts with acetic acid to produce an electric current. The device measures the current to display an approximate BAC.