ALTAIR 5X PID
30
Operation
US
Fresh Air Setup (FAS) at device Turn-ON
The Fresh Air Setup (FAS) is for automatic ZERO adjustment of the device.
The FAS has limits. If a hazardous level of gas is present, the device ignores the FAS command and
the device alarm activates.
The ability to perform an FAS at device turn-ON can be disabled by using MSA Link software.
Fig. 7 Fresh Air Setup
WARNING
Do not use the pump, sample line, or probe unless the pump alarm activates when the flow is
blocked. Lack of an alarm is an indication that a sample may not be drawn to the sensors, which
could cause inaccurate readings.
Failure to follow the above can result in serious personal injury or death.
Never let the end of the sampling line touch or go under any liquid surface. If liquid is drawn into the
device, readings will be inaccurate and device could be damaged. We recommend the use of an
MSA sample probe containing a special membrane filter, permeable to gas but impermeable to
water, to prevent such an occurrence.
WARNING
Do not perform 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.
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