STEP 5 – Instruct the subject
Instruct the subject to take in a deep breath, and provide a sample. When
providing a sample the subject only need blow out a constant, steady flow
of air, similar to whistling. Blowing too hard or too softly could result in an
invalid sample and the instrument will report this to the operator.
If using a mouthpiece, instruct the subject to form a seal around the
lipped-end of the mouthpiece with their lips and then blow; if using a cup
they should blow towards the cup, held about 10cm from their mouth.
The sniffer test should be carried out with the top of the instrument held
near to the subject or suspicious liquid.
The sample provided should be blown steadily and continuously until THE
OPERATOR says stop. He or she does NOT have to blow VERY HARD: a
LONG, MODERATE BREATH is all that is required. The subject must keep
his or her hands away from the instrument, so they cannot hide the
display from the operator’s view. Also, if relevant, warn the subject not to
try to ‘beat the instrument’.
STEP 6 – Take the breath specimen
The subject now blows hard enough to bring on the message FLOW and to
sound the continuous beep tone; and then for long enough for the sample
to be taken into the sensor for analysis.
If enabled in the instrument a manual sample can be taken if necessary at
any point during the routine by pressing the Action Button (AB).
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