lion alcolmeter
®
SD-400 User Handbook [v7]
Appendix 3: Alcohol Concentration
Units
This is relevant in the instrument checking and calibration functions.
Like any other breath instrument, though it may be read in blood
alcohol units, the lion alcolmeter
®
SD-400 measures the
concentration of alcohol in the expired breath. Having made this
analysis it is then possible to report the result in breath alcohol
concentration units (BrAC).
However, it is also possible to report the reading in terms of an
equivalent blood alcohol level (BAC or BAL). To do this it is
necessary to make use of an assumed blood:breath ratio [the
actual value of this is close to 2,300:1, although this continues to be,
the subject of much scientific (and often misinformed) discussion].
A3.1 Breath Alcohol (BrAC) Units
BrAC Units: Written As:
milligrams per litre
mg/l or mg/L
micrograms per hundred millilitres
µg/100ml or µg/% or µg/dl
micrograms per litre
µg/l or µg/L
grams per two hundred and ten litres
g/210L
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