| 摘要 |
An apparatus for determining the alcoholic content in blood. A sensor receives exhaled air from a person being tested and produces a signal which is sent to at least two comparator devices for comparing the output signal with at least two preset reference values. A logic circuitry of TTL elements is connected to the output of the comparator device and is arranged in conjunction with three light emitting diodes to actuate at least one light emitting diode based upon the result of the comparison to thereby indicate the alcoholic content. A first light emitting diode is actuated when the output is below the first reference value, the first light is extinguished and the second light is ignited when the output is between the first and second reference values, and the third light is ignited and the second is extinguished when the output exceeds the second reference value.
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