AlcoSense Ultra 사용 설명서 - 페이지 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.

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 test 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.