Vaisala GMK220 - Manual (Page 12)

User's Guide __________________________________________________________________________
10 _________________________________________________________________________ U421EN-1.1
9. Give the input data for the calibration.
CALICALI L
2
concentration >
ambient
>
ambient
>
where CO
2
concentration is given in ppm, P
ambient
is pressure given in
hPa and T
ambient
is temperature given in
°
C.
The sample quantity determines the number of measurements of
which averages are calculated. The sample quantity is recommended
to be at least 200.
NOTE The character after the CALICALI command is case-sensitive i.e. it has
to be given as capital letter (CALICALI L).
Example:
>CALICALI L 200 0 1013 23
Calibration start - Length is 200 samples (it takes
about 107 seconds)
You can interrupt operation by CTRL-C
1297.5 550.4 382.7 445.5 32.5
1295.2 554.5 482.0 445.9 32.5
...
1298.1 561.7 603.5 449.6 32.5
1296.9 557.3 523.4 454.2 32.5
Noise measurement ready
Res Avg = 470.491219
Res Std = 82.244873
FR Avg = 447.789145
FR Std = 2.355181
Rx Avg = 1296.441917
Rx Std = 1.870829
Tx Avg = 554.371452
Tx Std = 3.844639
Low gas ( 0 ppm) measurement done. Start high gas.
>
10. As the calibration at low end is completed, the software asks to
change to the high gas.
11. Adjust the flow rate of the high end gas to 0.6 l/min with a
screwdriver (item 4, Figure 1). Flush the chamber with the gas for 5
minutes.