Electrochemical breathalyzers

 

— the action of this type of sensors is based on the reaction of alcohol with a special catalyst: during such a reaction, an electric current is generated, according to the intensity of which the device displays the measurement result. Electrochemical sensors are noticeably more expensive than semiconductor sensors, but have more advanced performance characteristics. So, they have a noticeably higher speed of work; the catalyst reacts exclusively to alcohol, other impurities practically do not affect the measurement result; the accuracy of the device is almost independent of the ambient temperature; and verification and calibration of the sensor is required at least once a year, or even less often. Thus, most intermediate and professional level breathalyzers use this type of sensor.