AlcoSense Excel Інструкція з експлуатації - Сторінка 3
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How Breathalysers Work
Breathalysers work by measuring the concentration of alcohol vapour
in your breath. Contrary to popular belief the alcohol is not coming from
residue in your mouth but is actually evaporating from the blood that
passes through your lungs when you breathe. The amount of alcohol
evaporating from your lungs is directly proportional to the amount of
alcohol in your blood stream making it possible to accurately calculate the
per mil Blood Alcohol Concentration (‰BAC) or Milligrams of alcohol per
Litre of Breath (mg/l) and therefore your level of intoxication.
How Alcohol Is Processed by the Body
When you drink, alcohol is absorbed into the blood stream through
your mouth and throat but mostly through the stomach and small
intestine. The more you drink the more alcohol is absorbed by the body
and the higher your blood and breath alcohol readings will become.
Approximately 90 minutes after your last drink the alcohol is distributed
equally around the body and through the blood stream. This is known as
the point of Equilibrium.
As blood flows round the body around 90% of the alcohol is broken down
in to water and carbon dioxide by the liver in a process called Oxidation.
The remaining 10% of the alcohol continues to the lungs and kidneys. A
healthy liver typically breaks down alcohol at a rate of one unit of alcohol
per hour but sometimes it can take a longer or shorter time.
When you stop drinking your level of intoxication can change quickly (rise
or fall) for up to 90 minutes afterwards because of the time it takes for
alcohol to reach the bloodstream after drinking. For example it will take
longer for alcohol to reach the bloodstream if you have eaten recently,
less time on an empty stomach. There are too many factors that can
influence the reading just after drinking, this is the reason why we do not
recommend using the breathalyser within 90 minutes of drinking, the ideal
time is the morning after.
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Things That Can Affect the Reading of Your Breathalyser
There are some factors that can affect the reading of breathalysers
whether it be the AlcoSense breathalyser or a police system. Please note
that certain medications and conditions including diabetes can give false
positive readings. If you find you have a positive reading when you have
not drunk alcohol please contact us for assistance.
Do:
• Use the breathalyser the morning after a few drinks.
• Read the instructions carefully.
• Phone us if you have any difficulties.
• Only drive when the AlcoSense says 0.00 and you feel 100%.
Any amount of alcohol in your system will affect your ability to drive.
• Leave a minimum of 3 minutes between tests. Do not perform more
than 10 tests in one hour and no more than 30 tests in 24 hours.
More frequent testing can cause a build-up of breath condensation in
the breathalyser which can temporarily affect accuracy.
Don't:
• Blow into the breathalyser within 10 minutes of drinking, high levels of
alcohol in the mouth can permanently damage the sensor.
• Do a breath test within 90 minutes of drinking. Blood alcohol levels
can rise for up to 90 minutes after drinking (see page 4 for more info).
Results taken before this time can rise or fall quickly.
• Use the breathalyser for at least 30 minutes after using mouthwash,
breath spray, cough medicine or anything else that may contain alcohol
- you may get a false positive reading.
• Use the breathalyser for at least 30 minutes after having a cigarette or
eating ripe fruit - you may get a false positive reading.
• Perform a test in dirty air, i.e. a smokey room or pub.
• Use the breathalyser if you are breathing quickly (for example, after
running up the stairs) or have been holding your breath. This can
falsely lower or raise the reading respectively. Wait until you are
breathing normally again.
• Perform two tests sequentially, you may get a variation between
readings. This is because it can take a few minutes for the alcohol
concentration inside the lungs to stabilise again after the first test.
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