17
I’ve done two breath tests and got different results.
This is expected. The first test is the most accurate, if you perform a second
test within a few minutes of the first test the breath alcohol levels in your
lungs may not have stabilised after the first test, causing the second test to
give you a different reading. If you have recently drunk alcohol, your blood
alcohol level can also change quickly over the course of a few minutes. This
is why you should only use the breathalyser 90 minutes after drinking or
ideally, the morning after. If you test two different breathalysers back to
back you will also expect slightly different readings for the same reason.
This is why you cannot use one breathalyser to test the accuracy of another,
it can only be done using Breath Alcohol Simulators. This is why UK law
allows for up to 15% difference on sequential test results taken by the
Police.
I’ve done a lot of tests in quick succession and I’ve got
a strange result
This can be caused by a build-up of breath condensation or alcohol vapour
from previous tests in the breathalyser which sometimes cause temporary
inaccuracy until it evaporates, this can affect any breathalyser, including
Police breathalysers. To avoid this leave a minimum of 5 minutes between
tests and do not perform more than 5 tests in one hour, and no more than
20 tests in 24 hours. Always use a new mouthpiece for each test. If you do
experience this problem, the condensation should evaporate within 2 hours
at normal room temperature and the breathalyser will return to normal
operation.
My breathalyser started to do a test by itself and displayed an error
This can happen if the breathalyser is used in a noisy environment over
95dBA. When turned on and ready to receive a blow sample pressure
changes as a result of loud noises can occasionally cause the unit to think
breath is entering the device, and then show a blow error. If this occurs
please move to a quieter area away from the source of the sound and
attempt the test again.
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