PRINCIPLES OF
OPERATION
The Intoxilyzer
®
S-D2
uses an electrochemical
fuel cell, containing two
platinum electrodes, to
detect and measure the
concentration of alcohol vapor in expired breath.
When breath is drawn into this fuel cell, by means
of the sampling system, a small voltage is
generated in proportion to its breath alcohol
concentration. This fuel cell is fed to an electronic
amplifier and displayed on a digital meter (liquid
crystal).
The S-D2 incorporates two breath sampling lights,
controlled by an interlinked pressure switch and
timer system. The sampling lights show the
operator if the subject is blowing correctly, and
when he has provided a suitable sample of breath
for analysis.
The instrument is simple to operate and may be
used as often as required, provided that a suitable
delay is allowed between successive tests. This
time delay allows the fuel cell to clear itself of
alcohol and prevents the possibility of additive
readings. If no alcohol is present in a test, a
second test may be analyzed immediately, since
the fuel cell voltage is already at zero. Unless the
breath alcohol level of the subject is very high,
2
INTOXILYZER
®
S-D2 Operator’s Manual
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