CI-340 Operation Manual
CID Bio-Science
1554 NE 3
rd
Ave
Camas, WA 98607, USA
Phone: +1 (360) 833-8835
Fax: +1 (360) 833-1914
[email protected]
www.cid-inc.com
16
Figure 6: Configuration using compressed gas.
After the system zero is established, use a gas with known concentration of CO
2
to calibrate span.
Use the
key to
skip the “calibrate the span” setting.
Use known CO
2
Press the
key to proceed.
Enter the concentration of CO
2
in ppm at the following display:
Concentration ?
__ ppm
The known concentration should flow for approximately one minute.
Press
to save your selection. The system will then return to the following screen display and
reset:
ENTER to select Calibrate CO
2
H
2
O calibration follows similar procedures. Dry nitrogen gas or silicon gel (Figure 8) can be used for the
H
2
O zero, and a known partial pressure of H
2
O is used for the known H
2
O. A “DOS” program is provided
to convert relative humidity and temperature to kPa partial pressure. Run
RH2KPA.EXE
under DOS or in
a DOS window on a PC. Windows XP will automatically launch a DOS window if you double click on the
file name in Windows Explorer.
NOTE:
H
2
O span setting should be checked once every six months. It be checked often by conducting a
photosynthesis test with the “loop back” tube in place of a leaf chamber and sampling
a known
humidity of the atmosphere.
Содержание CI-340
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