Campbell-scientific AP200 CO2/H2O Atmospheric Profile System Uživatelský manuál stáhnout pdf (Strana 99)

Appendix F. Valve Sequence Timing

• Select inlet 1 to allow at least 10 s extra equilibration time. This

allows the humidity in the tubing and IRGA to equilibrate before

restarting the profile sequence.

As shown in TABLE F-4, this minimum timing adds up to 170 s for the

zero/span sequence. The timing parameters are adjusted as needed to equal a

multiple of the profile sequence cycle time. For example, if there are 8 levels

used, the profile cycle time is 120 s. Because this is less than the 170 s

required, it is doubled to 240 s. Extra equilibration time is added to each step to

make the zero/span sequence equal 240 s. If there are four levels used, the

profile cycle time is only 60 s. Three profile cycles times are used to give 180 s

for the zero/span sequence.

TABLE F-4. Timing for Zero/Span Sequence (setting the IRGA)

Number

of Levels

Profile

Cycle

Time (s)

Measure

Span

Time (s)

Measure

& Set Zero

Time (s)

Measure

& Set CO

Span

Time (s)

Equilibration

Time (s)

Zero/Span

Time (s)

Minimum 30 70 60 10 170

8 120 40 100 70 30 240

7 120 40 100 70 30 240

6 90 30 70 60 20 180

5 90 30 70 60 20 180

4 60 30 70 60 20 180

Each time the zero/span sequence is run, five records will be added to the

SiteAvg and CalAvg tables:

• CO

Span tank before setting zero or span

• Zero tank before setting zero or span

• Zero tank after setting zero

• CO

Span tank after setting zero

• CO

Span tank after setting span

F-5

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 119 120

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