SCREENING DEVICE
INTOXILYZER S-D2
The objective of this section is to familiarize the operator with the Intoxilyzer S-D2. The
operation, calibration, and maintenance of the Intoxilyzer S-D2 are discussed.
Principle of Operation:
The intoxilyzer S-D2 uses an electro-chemical fuel cell. Two platinum electrodes
measure the concentration of alcohol vapor in expired breath. When breath is drawn
into the fuel cell, a small voltage is generated in proportion to its breath alcohol
concentration. This fuel cell voltage is fed to an electronic amplifier and displayed on a
digital display (liquid crystal) calibrated to read the blood alcohol concentration of the
subject in g/100 ml, using the ratio of breath to blood concentration (2100 to 1), or
grams of alcohol per 210 liters of breath.
The “Set” button serves to prepare the sampling system to accept a breath sample. It
also saves on the battery by taking the fuel cell out of the circuit. The “Set” button
should be depressed during storage.
The instrument incorporates two breath-sampling lights controlled by an interlinked
pressure switch and timer system. Light “A” indicates the subject is blowing hard
enough to activate a pressure switch. The “restricted” or ‘whistling” mouthpieces are
required to cause sufficient back-pressure. Light “B” indicates the individual has blown
long enough to meet the preset timer requirements. This will ensure that a deep lung air
sample has been analyzed.
The “Read “button has two functions. It serves to release the “Set” button and to
activate the amplifier and display systems. During a test, it is depressed after the “A”
and “B” lights have come on. The “Read” button should be held in until a final value is
obtained.
The instrument is simple to operate and may be used as often as required providing a
suitable delay allows the detector to clear the alcohol. If the previous sample is clear of
alcohol, a new sample may be taken immediately. Normally, a second sample may be
taken within two minutes. Following very high alcohol concentrations, the unit will
require a few more minutes. Taking another breath sample, before the S-D2 is allowed
to clear the alcohol, may result in an additive or higher than expected result.
CONOR WN =~
Mouthpiece
Sampling Port
“Set” Button
“Read” Button
Alcohol Level Display
Calibration Control (on Side)
Breath Sampling Lights
Battery (on Bottom)
Leather or Soft Case
INSTRUMENT
Explanation of the Fuel Cell Chemistry:
Alcohol Breath Sample + Fuel Cell 5 Acetic Acid + Electrons* 5COz + H20 + O2
Fast Reaction Slow Reaction
Repeated Sampling in Short Period Effect
Acetic Acid Buildup Reaction Slow-Up
(Loss of Sensitivity)
Only With Passage of Time The Fuel Cell Regains Sensitivity
Reaction Occurs
Calibration should be accomplished in no more than two tries and when acetic acid has
not built up. To check for acetic acid build-up, depress the “Read” button. The display
should read “0.000 AC.” The following figure demonstrates the build up and elimination
of acetic acid and electrons.
—>
Two to Three Minutes
Loy
<- 25 Seconds —
Rate of Build-up
Time (Seconds)
Rate of Electron Build-Up
Description of Analysis:
The 5-D2 contains a fuel cell sensor backed by a spring-loaded diaphragm and a
sampling valve. When the valve is released, the diaphragm draws a one ml (cc) sample
from the breath into the fuel cell for analysis. Alcohol in the cell reacts to form acetic
acid. A signal is generated in the fuel cell proportional to alcohol concentration in the
breath sample. An amplifier powered by the nine-volt, alkaline battery causes the result
of the analysis to be displayed as alcohol concentration (0.####) when the “Read” button
Is depressed and held in.
The “Read” button operates in two stages. First, it releases the valve thus taking a
sample. Secondly, when fully depressed, it switches the instrument “on” electrically.
When the “Set” button is depressed and locked in, the electric system is off. The “Set”
button should be locked in to speed up the chemical reaction and maximize the “burn-
off rate.
Sampling System
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Operating Procedure:
The operator should observe the subject three minutes (prior to a screening
device test) with nothing in the subject's mouth. This will help prevent raw alcohol
and smoke from damaging the detector. This time period will allow for most of the
mouth alcohol to be absorbed. This deviates from the S-D2 manual instructions.
If the subject is required to take an evidentiary test on the Intoxilyzer 5000, a full
20-minute deprivation period would be necessary. A 20-minute waiting period is
only necessary for an evidentiary test (on the Intoxilyzer 5000.)
1. Check the operating temperature (0-40° C or 32-104° F) on the side of the
leather case. If any number is visible, proceed to step number 2. If a number is
not visible, place the Intoxilyzer S-D2 in a warm place for approximately two
minutes and recheck.
2. Depress and lock the “Set” button. After approximately two minutes, depress the
“Read” button. When the display reads less than .002, proceed with the test. If
not, repeat as many times as necessary.
3. Attach a clean mouthpiece. Hold the instrument upside down to avoid
introducing liquid into the sampling system.
4. Take a sample. Instruct the subject to blow steadily into the mouthpiece for as
long as possible or until told to stop. He must blow strongly enough to bring on
light “A” and long enough to bring on light “B.” When light “B” illuminates, press
the "READ" button. Tell the subject to stop blowing. If light “B” does not
illuminate, the subject has not provided a sufficient sample.
5. Observe the reading. To obtain an indication of the subject's blood alcoho!
concentration, continue to hold down the “READ” button and observe the display
as it rises to a maximum reading.
6. Discard the mouthpiece and depress the “SET” button.
Interpretation of Results:
The highest BAC displayed is the alcohol concentration of the subject. The Intoxilyzer
S-D2, when properly calibrated, will read within +10 percent of the true value. This
value is considered pre-evidentiary for the purposes of DUI, BUI, and HUI. Therefore, a
blood, breath (Intoxilyzer 5000), or urine test will be necessary.
Diabetic Reaction (Acetone):
This instrument will not detect or react with acetone from the subject. Therefore,
it does not interfere with the alcohol concentration.
Mouth Alcohol:
Keep in mind that mouth alcohol may give a false high level. Most of the mouth alcohol
will be gone in three minutes.
Calibration of the S-D2:
A simulator is used to calibrate screening devices. The current solution alcohol
concentration is “0.11” g per 210 L vapor. The S-D2 is calibrated to “.110.”
SUMMARY
Purpose:
» Estimates the breath alcohol concentration
> Observation period
e Three minutes
Certification:
> Chemical Test Operators, Devices, and Instruments
e NDCC 39-20-07 and 39-20-14
> Protect Instrument:
e DO NOT blow smoke into devices
* DO NOT breathe raw alcohol into devices
* Avoid heat and direct sunlight in vehicles
Intoxilyzer S-D2:
> Read the highest value obtained on the breath
» Contains a fuel cell detector
> Will detect other chemicals in the breath:
e Methyl alcohol
* |sopropyl alcohol
> Will not detect acetone
> ls temperature sensitive
e Operating range: 0-40° C (32-104* F) (Note: The instrument will not work
properly outside this temperature range.)
Calibration:
> Calibrate with a Standard Simulator Solution
* 0.11 g per 210 L (+5 percent)
* Range 0.105 to 0.115 g/210 L (checking calibration only)
* Unit should be checked once a month and calibrated as needed to ensure
proper estimation of breath alcohol concentration
THE SIMULATOR AND STANDARD SOLUTION
The Simulator is a specially designed, constant temperature, wet-bath instrument
devised for the purpose of providing a standard alcohol vapor. The solution is provided
every three months to agencies without access to an Intoxilyzer 5000.
The screening devices should be calibrated soon after the simulator solution is
changed. The solutions temperature is maintained at 34.0 + 0.2 * C. This temperature
variation will not result in an unacceptable error.
Change the solution according to the directions provided below.
The Simulator should be plugged in and warmed up to operating temperature. The
operator should blow through the Simulator for a few seconds before attaching the
output tube to the mouthpiece of the Screening Device. This equilibrates the vapor
above the solution with the proper amount of alcohol.
Below is the standard set-up for attaching the simulator to the Intoxilyzer S-D2 for
performing the calibration or calibration check. Note: The Intoxilyzer S-D2 is held
UPSIDE DOWN to prevent fluid from the Simulator entering the sample chamber
of the S-D2.
WARNING
To avoid filling the sample chamber with water, be careful not to connect the input port
of the simulator to the Intoxilyzer S-D2.
Model Mark IA Simulator:
The Mark IIA Simulators are used for calibrating the S-D2 instruments. The outlet tube
is connected to the mouthpiece on the S-D2.
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Proper
Temperature
Range
34° =0.2°C
{ ~ 93.2 °F)
Calibration:
Using the simulator solution sent by the Toxicology Section, plug in the simulator and
allow the simulator to reach the correct temperature (34.0°+ 0.2° C).
Check the simulator for proper operation and leaks.
If the calibration screw is not accessible through the leather case, remove the wrist
strap and take the Intoxilyzer S-D2 out of the leather carrying case.
Turn the calibration screw a half turn counterclockwise.
Depress the “Read” button for ten seconds and note the alcohol concentration of less
than .002 AC. If not, depress the “Set” button. Wait approximately two minutes.
Repeat this step until the AC is less than .002.
Attach a mouthpiece and connect the simulator and Intoxilyzer S-D2 mouthpiece
together. Blow simulator solution through the mouthpiece and observe the “A” and “B”
lights. Blow the solution hard enough to illuminate the “A” light and long enough to
illuminate the “B” light. When the “B” light illuminates, depress the “Read” button and
continue to hold it in.
Observe the display. Immediately after the introduction of a good sample, the numbers
on the display should increase rapidly. Within a few seconds, the numbers will slow and
eventually stop increasing. Approximately three or four seconds later, the numbers will
begin to decrease. Prior to this decrease, the calibration screw must be adjusted so the
instrument displays the expected alcohol concentration (0.110). Ifthe displayed value is
too high, the screw should be turned clockwise. If too low, the screw should be turned
counterclockwise. If the displayed numbers begin to decrease before this adjustment is
made, calibration should be attempted again by repeating steps four through seven.
Return the S-D2 to the carrying case and attach the wrist strap, if necessary.
Maintenance:
It is recommended that the unit be checked for calibration, once a month, and
recalibrated if necessary. Operators should run a calibration check to assure
accuracy in testing. To do this, a test of a new simulator standard should be run. If the
value obtained is more than five percent higher or lower, the unit should be recalibrated
using the above procedure.
Example: A simulator solution of 0.11 percent should read from 0.105 - 0.115 AC.
If the Intoxilyzer S-D2 shows any of the following, you should contact the Toxicology
Section or a Field Inspector for troubleshooting and repair (please enclose a note
detailing the problem):
1. Fails to zero properly (.000 to .001 AC).
2. Fails to recalibrate.
3. Fails to accept a sufficient sample.
4. Fails to illuminate the display, light “A” or light “B.”
Battery:
Other than recalibrating the device, changing the battery is the only maintenance
that should be done by chemical test operators.
If while depressing the “Read” button, “LO.00" is displayed, the battery voltage is low
and must be replaced. This will occur when the voltage falls to 7+ 0.5 volts. The
operator should replace the battery with a nine-volt, alkaline battery. Do not use
rechargeable batteries. After replacing the battery, the Intoxilyzer S-D2 should be
checked and recalibrated, if necessary.
Mouthpieces:
The S-D2 requires “restricted” mouthpieces. They may be ordered over the phone from
the Toxicology Lab. Be sure to mention that you need “restricted” mouthpieces for the
Intoxilyzer S-D2.
Temperature:
The S-D2 should be kept out of direct sunlight and at room temperature. Extreme heat
inside motor vehicles may damage the instrument. Cold temperatures may require
warming the S-D2 prior to use. As a general rule, use the S-D2 in a
temperature-controlled vehicle.
Ref.: Lion Alcolmeter™ S-D2 Operating Instruction Manual, Lion Laboratories, P.C.; Barry, South Glamorgan;
Wales, United Kingdom; 1995; and the Intoxilyzer S-D2, Service Manual, Breath Alcohol Testing Instrument: CMI,
Inc., Owensboro, KY, 1996.
APPROVED METHOD FOR OPERATING THE INTOXILYZER S-D2
¡The following device and method are approved to conduct onsite screening tests under sections ——
20.1-15-15 and 39-20-14 of the North Dakota Century Code for the purpose of estimating the alcohol
content of a person's blood. - E.
The INTOXILYZER S-D2, manufactured by Llon Laboratories, P,C.: Barry, South Glamorgan, Wales,
United Kingdom; is approved for the administration of onsite screening tests to estimate the alcohol
content of a person's blood.
1. Ascertain that the subject has nothing to eat, drink, or smoke within three minutes prior to the
subject providing a breath sample.
2. Check the operating temperature (0-40°C) on the side of the leather case. if any number is _
—— Visible, proceed to step number 3. If a number is not visible, place the INTOXILYZER S-D2 In
‚ — e pocket close to your body for approximately two minutes and recheck.
3. Press the ‘Read button for approximately 10 seconds. The display should read less than
0.002. If & higher reading is shown, depress and lock the ‘Set’ button and place the ~~
INTOXILYZER 8-D2 In a pocket close to your body for approximately two minutes and repeat
step number 3. a
4. Depress and lock the ‘Set’ button.
‚ 5. Attach a mouthpiece.
stop. The subject must blow stron
6. Instruct the subject to blow steadily info the mouthpiece for as long as possible or until told to
* subject must blow strong enough to bring on Light A and long enough to bring on
Light B, When Light B illuminates, press the ‘READ’ button. Tell the subject to stop blowing.
If Light B does not illuminate, the subject has not provided a satisfactory sample. The
operator may ask the subject to repeat blowing Into the mouthpiece. |
7. Continue to hold down the ‘READ’ button and observe the display. The maximum readin is
the correct estimate of the subjects alcohol concentration.
8. Discard the mouthpiece and depress the ‘SET’ button.
A test administered according to the operating procedure or the Insert In the leather case of the у
INTOXILYZER S-D2 device, shall be deamed to be in accordance with the Approved Method. Qu |
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