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What is the difference between a Semiconductor Sensor (non-alcohol specific) vs. the Fuel cell (alcohol specific device)?

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What is the difference between a Semiconductor Sensor (non-alcohol specific) vs. the Fuel cell (alcohol specific device)?

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The semiconductor sensor, also called a solid-state or Taguchi sensor, measures alcohol by detecting the change in electrical resistance of a circuit exposed to volatile hydrocarbons. It consists of a small bead of metal oxide, which is heated to a high temperature, and a voltage is applied to produce a small current. As a substance (alcohol) comes into contact with the small bead, it changes this current. This change is then converted into an alcohol reading. The major advantages of this sensor are its accuracy (when properly calibrated), low price, and its durability. However, this sensor suffers from two significant drawbacks. First, the device requires frequent calibration as the characteristics of the semiconductor sensor change with time and use. Second, the device is not specific to alcohol. Many hydrocarbons, including motor vehicle exhaust and even cigarette smoke, affect the response. Either of these drawbacks may produce an unacceptably high frequency of false positive readi

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