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If the PAS V is used in still air at the optimum distance of 5-7 inches from the
subject's mouth, the chart below will give you an approximate indication of the
subject's breath alcohol concentration (BrAC). Roughly, the readings can be
interpreted as follows:
Approximate
BrAC (%)
NOTE: In some situations it is not practical to get the PAS V as close as 5-7
inches from the subject's mouth. The PAS can be used at greater distances, but
readings will be lower. As a rule of thumb, one less bar will light up for every 2
inches beyond the optimum 5-7 inches. Using the PAS V at distances greater
than 10 inches is not recommended for breath-alcohol sampling, because of the
effect of drafts.
Low Temperature Operation
At low temperatures, fuel cells take longer to reach their peak readings of alcohol
level. They also take longer to recover from each positive sample before you can
take another. To overcome this problem, your PAS V includes a thermostatically
controlled heater that maintains a fuel cell temperature of 104◦F (40◦C).
Since the PAS V is normally used at night, the heater comes on automatically
whenever you turn on the flashlight.
temperature within a few minutes, although the exact time obviously depends on
how cold it was to start with. The orange
thermostat regulates the fuel cell temperature.
R
E
D
R
E
D
R
E
D
bars lit
Y
E
L
L
O
W
Y
E
L
L
O
W
Y
E
L
L
O
W
bars lit
G
R
E
E
N
G
R
E
E
N
G
R
E
E
N
bars lit
Subject MAY exceed the 0.08 or 0.10%
BrAC legal limit for drivers of private
vehicles
Subject MAY exceed the 0.04% BrAC
legal limit for certain commercial vehicles
and aircraft
Alcohol is present
The fuel cell reaches its operating
H
T
R
H
T
R
H
T
R
indicator cycles on and off as the
10
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