If the subject sucks back whilst the instrument is taking the sample, in such
a way that it could affect the analytical result, then a sample is not taken
and the display shows the following warning:
In all instances, the instrument will reset and display again that it is ready.
Re-instruct the subject to blow into the mouthpiece.
There is no requirement to change the mouthpiece for this repeat
attempt, though the operator may choose to do so.
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