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INTOXILYZER
®
S-D2 Operator’s Manual
itself to alcohol is not affected by changes in atmospheric
pressure; it is only the concentration of the alcohol in the
vapor from the dry gas standard that is affected.
The Altitude Correction Chart on the preceding page gives
the correction factors which should be applied to the stated
dry gas value when calibration checks or adjustments are
made at various altitudes above sea level.
Correction factor sample:
Suppose the dry gas standard you are using
has a value of .045% BAC at sea level, but
it is being used at an altitude of 500 feet.
Using the chart on page 16, the correction
factor would be (0.981). Therefore, the
corrected value of the dry gas standard
would now be (.045 x .981 = .044% BAC).
USE OF A WET BATH SIMULATOR
If required, a wet bath simulator can be used instead of a
dry gas standard to perform calibration checks and
adjustments on the S-D2.
A wet bath simulator should be used according to its own
instructions. Pay particular attention to the alcoholic
strength and temperature of the solution used.
A mouthpiece should be attached to the simulator outlet for
direct attachment to the sampling port on the instrument.
A flow rate of air of about 1.5-2 liters per second should be
used. Any higher rate may result in the formation of an
aerosol and lead to excessive cooling of the solution itself.
The simulator vapor must be allowed to pass through the
mouthpiece for at least ten seconds before the sample is
taken for analysis.
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