Etilômetro (bafômetro) - como funciona

Introduction to the 8mm Breathalyzer

Overview of the Instrument

• The video introduces the 8mm breathalyzer, commonly known as a bafômetro, which measures ethanol concentration through deep lung air analysis.

• It is primarily used by traffic agents to verify if drivers are under the influence of alcohol.

How the Breathalyzer Works

• The testing process involves the individual blowing into the device for approximately five seconds, ensuring at least 1.5 liters of air is provided.

• Ethanol molecules from the lungs enter an electrochemical cell (fuel cell), where they undergo oxidation, generating an electric current.

Mechanism of Action

• The electrodes in the fuel cell are separated by an electrolyte; oxidation occurs at the negative electrode while reduction happens at the positive electrode.

• The generated electric current correlates with ethanol levels in the exhaled air and is displayed in milligrams per liter for law enforcement reading.

Calibration and Accuracy

• Breathalyzers must be verified by INMETRO every 12 months and comply with specific regulations (Portaria nº 6 de 2002).