CIRAS-3 Operation Manual V. 1.09 186 support@ppsystems.com
CO
2
& H
2
O Control Column
The CO
2
& H
2
O Control column assembly contains 2 desiccants which are used for controlling CO
2
and
H
2
O. It also includes a water vapor equilibrator.
2
2
O Control Column Assembly (Part Number 10121-1)
Column Identifiers
• H
2
O Absorber: Drierite
• CO
2
Absorber: Soda Lime
One column is filled with Drierite (for control of
H
2
O) and one with soda lime (for CO
2
control).
Drierite removes H
2
O from the air stream and
soda lime removes CO
2
from the air to achieve
levels requested by the user.
This assembly also includes a water vapor
equilibrator containing NAFION
®
tubing which
should not require replacement and is used to
equilibrate the humidity with the ambient.
ALWAYS change self-indicating desiccants when
the column is approximately 50% exhausted. If
using non-indicating desiccants, we recommend
changing them out prior to each measurement
campaign to play it safe.
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