Calibration
CIRAS-2 Operator's Manual Version 2.04
- 145 -
Performing Calibrations
Allow the CIRAS-2 to warm-up for at least 30 minutes. From the above notes, connect up CIRAS-2 to the
calibration source then from the PC Windows display, select
Utilities
–
Calibration
-
Start
. Next, click on
the type of calibration (CO
2
or H
2
O) and if you are using an external CO
2
source, enter the concentration
from the gas cylinder. Click
OK
.
CIRAS-2 will now perform a zero and when the displayed concentration is steady click the corresponding
button. After calculating the calibration factors, the existing and new factors will be displayed. The option
is then given to use the new factors, retain the existing factors or return to the factory defaults.
If it is decided to use the new factors then it is recommended that the calibration procedure be repeated to
check their veracity.
Calibration Check
A calibration check feature is designed into the system to verify system calibration for both CO
2
and H
2
O.
The internal standard is used for the CO
2
checking and the water vapour calibrator for the H
2
O.
Click on
Calibration Check - Start
. Connections and precautions are as described under the
corresponding calibration.
