Vaisala GMK220 - Manual (Page 9)

Chapter 3_____________________________________________________________________ Operation
VAISALA _____________________________________________________________________________7
6. Let the calibrator settle for 10 minutes.
7. Connect the reference gas and adjust the flow rate to 0.6 l/min
with a screwdriver (item 4, Figure 1). Flush the chamber with the gas
for 5 minutes.
8. Input the ambient barometric pressure.
MF_PRESSURE XXXX < CR >
where xxxx= pressure in hPa.
Example:
>MF_PRESSURE 1013
MF_PRESSURE=1013
>
9. Input the ambient temperature.
MF_TEMP XXX < CR >
where xxx = temperature is given in tenths of °C (25 °C = 250).
Example:
>MF_TEMP 250
MF_TEMP=250
>
10. List the carbon dioxide concentration.
MF_MODE 2< CR >
Example:
>MF_MODE 2
MF_MODE=2
1620.1
1618.3
1619.8
1619.8
...
The carbon dioxide concentration (in ppm) is measured every 0.5
seconds.