Fresh Air Setup (Fas) - MSA ALTAIR 5 Manual De Funcionamiento

3.2.2 Fresh Air Setup (FAS)

The Fresh Air Setup (FAS) is for ZERO calibration of the instrument.
The FAS has limits. If a hazardous level of gas is present,
the instrument ignores the FAS command and the instrument
alarm activates.
NOTE: The Fresh Air Setup does not apply to the CO 2 sensor.
Do not activate the Fresh Air Setup unless you are certain
you are in fresh, uncontaminated air; otherwise, inaccurate
readings can occur, which can falsely indicate that a
hazardous atmosphere is safe. If you have any doubts as to
the quality of the surrounding air, do not use the Fresh Air
Setup feature. Do not use the Fresh Air Setup as a substitute
for daily calibration checks. The calibration check is
required to verify span accuracy. Failure to follow this
warning can result in serious personal injury or death.
Figure 3-1. Fresh Air Setup
The instrument displays a blinking "FRESH AIR SETUP?", prompting
the user to perform a Fresh Air Setup:
1. Press the ▲ button to bypass the Fresh Air Setup.
• The Fresh Air Setup is skipped
• The instrument goes to the Measuring page (Main page).
2. Press the ▼ button to perform the Fresh Air Setup.
• The instrument starts the FAS sequence and displays the
FAS screen
• A progress bar shows the user how much of the FAS
is completed
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