Rae MultiRAE PLUS PGM-50, Руководство по эксплуатации и обслуживанию

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PROGRAMMING OF MULTIRAE
4 - 10
4.4.1 Fresh Air Calibration
This procedure determines the zero point of the sensor
calibration curve. To perform fresh air calibration, the
calibration adapter and a bottle of “fresh” air (optional) are
required. The “fresh” air is clean dry air with 20.9 % oxygen
concentration and without any organic, toxic or combustible
gases or impurities. 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.
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 on the
calibration adapter over the inlet port of the
MultiRAE
PLUS
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.
3. Press the
[Y/+]
key to start “fresh air calibration” of the
monitor. 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?”