Technical information

SYSTEM SETUP / CALIBRATION
3/31/2008 Rev. 4.3 5-5
Figure 5-1. 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 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.