Campbell Scientific AP200 CO2/H2O Atmospheric Profile System - Manual (Page 50)

AP200 CO
2
/H
2
O Atmospheric Profile System
Sequence Timing, for timing details). When the sequence is restarted, the
AP200 will set seq_ACTIVE = True and STARTsequence = False.
STOPsequence: Allows the user to stop the sequence. Set this variable to
True to stop the automatic valve switching sequence. The AP200 will
immediately set seq_ACTIVE = False and leave the valve_number in its
current state.
valve_number: Controls which valve is selected. It may be 1 through 8
(profile inlets), 9 (zero), 10 (CO
2
Span), or 11 (H
2
O Span). If the sequence is
active ( seq_ACTIVE = True) the AP200 controls the state of valve_number
and the user may not change it. If the sequence is stopped ( seq_ACTIVE =
False), the user may change the value of valve_number to control the valves
manually.
5.6 Verify Performance
After the AP200 is installed, it is important to make sure it is operating
properly.
5.6.1 Quick Status Check Using a Keyboard Display
The optional, hard-mounted keyboard display or a hand-held CR1000KD
provides an easy user interface to the AP200. See Appendix A, Keyboard
Display Menu, for a listing of the AP200 keyboard display menus. See the
CR1000KD User Manual for operating instructions. Press a key to activate the
display and select the Check Status page:
This menu page gives a quick look at the following public variables:
diag_AP200: this should be zero. If not, see Appendix B, AP200 Diagnostics.
CO2: this is the CO
2
concentration given in ppm. Verify that this is a
reasonable value.
H2O: this is the H
2
O concentration given in ppt. Verify that this is a reasonable
value.
seq_ACTIVE: this should be True. If not, see Section 5.5, Starting and
Stopping the Sequence.
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