2 do co2 and h2o zero, Do co, And h – Campbell Scientific AP200 CO2/H2O Atmospheric Profile System User Manual
Page 54: O zero, 2 do co
AP200 CO
2
/H
2
O Atmospheric Profile System
If
seq_ACTIVE is True, then set STOPsequence = True to stop the sequence
and then verify that
seq_ACTIVE changes to False.
Set
valve_number to Zero (9). Look at the LEDs on the valve module to
confirm the selected valve is now active.
The
CO2_SPAN_PPM variable displays the concentration in the CO
2
span
tank.
Check the value of
diag_AP200. If it is not zero, a problem in the AP200
system should be resolved before continuing (see Appendix B, AP200
Diagnostics).
Wait for the values of CO
2
and H
2
O to stabilize. Normally, this takes one or
two minutes.
Record the value of CO
2
. This is the measured CO
2
concentration in ppm. If
the zero cylinder is selected, the value should be close to zero. If the CO
2
span
tank is selected, it should be close to the value of
CO2_SPAN_PPM.
Record the value of H
2
O. This is the measured H
2
O concentration in ppt. The
value should be close to zero for either cylinder.
Set
valve_number to CO
2
span (10) and repeat the previous steps.
Press
6.2.2 Do CO
2
and H
2
O Zero
At the
Manual Zero/Span menu, select
guides the user through the steps to flow the zero gas and to send the command
to zero the IRGA.
If
seq_ACTIVE is True, then set STOPsequence = True to stop the
sequence. Then verify
seq_ACTIVE changes to False.
Set
valve_number to Zero (9). Look at the LEDs on the valve module to
confirm the Zero valve is now active.
Check the value of
diag_AP200. If it is not zero, a problem in the AP200
system should be resolved before continuing (see Appendix B, AP200
Diagnostics).
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