Rae Q-RAE, Руководство по эксплуатации и обслуживанию

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PROGRAMMING
4 - 9
4.4.1 Fresh Air Calibration
This procedure determines the zero point of the sensor
calibration curve (and span for O
2
). The “fresh” air
required for zeroing is clean dry air with 20.9% oxygen and
without any organic, toxic or combustible gases or related
impurities, preferably from a pure air cylinder. If such an
air bottle is not available, any clean ambient air without
detectable contaminant can also be used. A charcoal filter
should be used if one is not sure of the ambient air’s purity.
Note: Charcoal filters remove most organic vapors but will
not remove methane, propane or hydrogen.
1.
“Calibrate Monitor?” is the first menu item in Table
4.1. Press
[Y/+] to perform calibration. The first sub-
menu shows: “Fresh Air Calibration?”
2. If the “fresh” air bottle is available, twist the Luer
calibration adapter onto the inlet port of the Q-RAE
Monitor and connect the other end of the tube to the
fresh gas bottle. If the “fresh” air bottle is not
available, simply leave the monitor in an area free of
any detectable vapor or attach the charcoal filter.
3. Press [Y/+] to start fresh air calibration. The display
shows “zero ...in progress” followed by the name of
each sensor and the message “zeroed.” The display
should show a reading of “20.9” for the oxygen sensor
and “0.0,” or a very small number, for all other sensors.
4. After about a 5 second pause, the display will show the
message “Zero Cal Done! ” and move to the next sub-
menu “Multiple Sensor Calibration?”