SAF’IR EVOLUTION Instruction Manual P a g e 17
Measurement principle
SAF’IR EVOLUTION uses infrared technology to measure the absorption of a monochromatic
light by the ethanol molecule. The absorption value is directly proportional to the alcohol
concentration, which is used to calculate the BrAC in the breath sample provided.
As soon as the exhalation reaches the minimum flow required, the sampling pump starts.
Air exhaled through the mouthpiece is then sampled in the measuring system, which
consists of:
Infrared transmitter
Pyroelectric detector
Infrared filter
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