PROGRAMMING OF VRAE
4 - 9
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, snap in the
calibration adapter over the inlet port of the VRAE
Monitor and connect the other end of the tube to the
fresh gas bottle, as shown in Fig. 4.4.1. 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 “0.0”, or a
very small number, for all sensors. For the oxygen
sensor in model PGM-7800, it should show a “20.9” as
the reading.
1. After about 30 seconds pause, the display will show the
message “Zero Cal Done! Reading=” and the
instantaneous fresh air readings.
2. Press either
[Y/+]
or
[MODE]
once and move to the next
sub-menu “Vol% Zero Calibration?”. Apply the Vol%
Zero gas and press
[Y/+]
to start. The display shows
“zero... in progress…” followed by “Zero cal
done…Reading = 0”.
3. Press either
[Y/+]
or
[MODE]
once and move to the next
sub-menu “Multiple Sensor Calibration?”
