Alcotest 7410 GLC User’s Manual
7
Precautions When Using The GLC
1. Mouth Alcohol
All deep lung breath samples originate in
the lower part of the lungs and pass through
the mouth before entering the Alcotest. Any
alcohol present in the mouth during this
time will contaminate the breath sample.
The
raw
alcohol, because of its high
concentration, saturates the breath sample
and produces a high result. For example, an
“F” might be obtained when the true result
should be an “A” or “P.” Mouth alcohol
occurs after recent consumption of alcoholic
beverages or if a belch or burp brings up
alcohol from the stomach. This residual
alcohol disappears rapidly, usually in fifteen
minutes or less.
Try to establish the time of the last drink
and ensure fifteen minutes has passed from
that time before conducting the test. This
will minimize the possibility of a falsely
high ASD test.
NOTE: High alcohol concentrations
obtained from mouth alcohol could shorten
the life of the electro-chemical sensor.
2. Smoking
Tobacco smoke in the expired air can cause
damage to the electro-chemical sensor. If
the subject taking the test is smoking, it is
important that you have the person stop.
Then wait for at least three minutes before
taking a breath sample.
3. Radio Frequency Interference
The GLC should not be used within 30 cm
of the antenna of any police radio
equipment in use. It is permissible to use it
in the police vehicle.
4. Vent
The vent at the rear of the instrument (below
the mouthpiece grommet) must not be
blocked or it will disrupt normal sampling.
5. Temperature
Cold temperatures (
#
5°C) could affect the
operation of the instrument. Use of the GLC
should be restricted to the inside of the
police vehicle.
6. Handling
Do not allow the subject to hold the
instrument. It is recommended that the
police officer use the wrist strap. Store the
instrument carefully to prevent damage.