Operation
MSA
ALTAIR 4X
GB
29
Fresh Air Setup (FAS)
The FAS is for automatic Zero calibration of the device.
The Fresh Air Setup has limits. The zero of any sensor that is outside of these limits
will not be adjusted by the FAS command.
Fig. 3
Fresh Air Setup
Warning!
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 per-
sonal injury or death.
If a battery charging cycle is interrupted before it is completed [4 hours
for a fully discharged battery], allow the device’s internal temperature to
stabilize for 30 minutes before performing a Fresh Air Setup.
COMB/EX
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H2S
CO
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