CIRAS-3 Operation Manual V. 1.09 101 support@ppsystems.com
Find Max C
Press Find Max C (F3). This process determines the maximum CO
2
level that can be achieved with the
CIRAS-3. This should be performed prior to using “Approximate reference air” for CO
2
reference (See
Settings (F2)
for optimal control. Prior to starting this process, make sure that you have inserted a fresh
CO
2
cartridge and that all chemicals are fresh. Hit Start (F2) to begin the process.
This process is automated and you should see the CO2r value settle out just above 2000 µmol mol
-1
and
the message “… calibration in progress” just above the graph. The system will also perform and Auto
Zero. If this process is successful, you will receive a message as follows:
Press OK to accept and then Back (F1). If you are not successful and you get a message that says it
can’t find Max C, check your chemicals again, tighten the CO
2
cartridge holder to ensure that the
cartridge was pierced when inserted and perform a new Max C. You can now proceed to Settings (F2)
and select “Approximate reference air” if you want to use this option for CO2 Reference.
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