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.

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 personal 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.

Figure 3 Fresh Air Setup

If this option is enabled, the device displays "FAS?", prompting the user to perform a Fresh Air Setup.

1.

Press the p button to bypass the Fresh Air Setup.

•

The Fresh Air Setup is skipped and the device goes to the Measuring page (Main page).

2.

Press the button within 10 seconds to perform the Fresh Air Setup.

•

The device starts the FAS.

•

The screen shows a No Gas Symbol, a blinking hourglass, and all enabled gas sensor readings.

•

At the end of the FAS Calibration, the device displays "FAS PASS" or "FAS ERR" along with the flags of the sensors that were outside of the FAS limits. All sensors that are within the FAS limits will be zeroed.