How does a breathalyzer work?
For some drivers, a Breathalyzer test can be the difference between driving home or being driven to jail. So just how does a Breathalyzer really work? Good question! Our video report has the answer. More Good Question! See Other Good Questions | E-Mail Us Your Good Question! (© MMVII, CBS Broadcasting Inc. All Rights Reserved.
Breathalyzer is the only equipment which can analyze the alcohol level presented in the body.
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When a person consumes alcohol, the body immediately absorbs the alcohol in the mouth, the stomach, and the intestines. This alcohol is rapidly distributed into one’s blood, which affects the central nervous system. The human liver acts as a filter for the bloodstream. Alcohol is removed from the body and passed through the alveoli in the lungs. With each breath, some alcohol is exhausted from the lungs and out of the body. Breathalyzers are designed to test this exhausted alcohol for accurate results. By taking a “deep lung air” sample, a breathalyzer is able to draw a very accurate reading of your BrAC or Breath Alcohol Concentration. Using a breathalyzer immediately after taking a drink can not only provide a high BrAC result, but also cause damage to the sensor. This residual alcohol in the mouth takes roughly 20-30 minutes to dissipate. More information can be found in our article “How a Breathalyzer Works”.
Most breathalyzers use one of three technologies to detect alcohol: a spectrophotometer, a fuel-cell sensor or a semiconductor oxide sensor. Spectrophotometer technology is used in large, table-top breathalyzers often found at police stations. Spectrophotometers work by identifying molecules based on the way they absorb infrared light. The level of ethanol in a sample is singled out and measured, and a subject’s alcohol level can then be determined. Breathalyzer.net does not carry spectrophotometer testers.
