CIRAS-3 Operation Manual V. 1.09 17 support@ppsystems.com
Insert a fresh CO
2
cartridge
CO
2
cartridges allow for accurate and precise control of CO
2
and we highly recommend using them for
best results. Unscrew the CO
2
cartridge holder and insert a new CO
2
cartridge as shown below. Next,
screw the holder into the CO
2
regulator turning clockwise until snug. If you hear a small hiss (indicating
the cartridge is being pierced) continue to turn the holder until snug to ensure that the cartridge is both
pierced and sealed properly into the regulator assembly. Each CO
2
cartridge will last at least 24 hours
from the time it is installed.
We use 8g CO
2
cartridges which are manufactured by a company called ISI (https://www.isi.com/). They
can easily be sourced from many different suppliers around the world. If you have any questions or
problems related to these CO
2
cartridges please contact PP Systems.
Is it possible to perform measurements under ambient conditions without using a
CO
2
cartridge?
Yes and it is very easy. To do so make sure that the CO
2
cartridge holder is empty and that the soda lime
is removed from the CO
2
/H
2
O control column on the CIRAS-3 console. The empty soda lime column will
ensure that ambient air is used for your reference air and the column will simply act as a smoothing
volume. Go to Settings (F2) and select “Ambient (remove chemicals)” for CO2 Reference. We just
wanted to bring this to your attention for future use but for this tutorial we will be using a CO
2
cartridge for
controlling CO
2
.
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