CIRAS-3 Operation Manual V. 1.09 185 support@ppsystems.com
Zero Column Assembly
The Zero column assembly contains 3 desiccants which are used for the analyzer ZERO ensuring long
term stability and accuracy of the CO
2
and H
2
O gas analyzers.
Zero Column Assembly (Part Number 10122-1)
Column Identifiers
• H
2
O Absorber: Drierite
• MS: Molecular Sieve
• CO
2
Absorber: Soda Lime
One column is filled with Drierite and Molecular Sieve
and the other with soda lime. Drierite removes H
2
O from
the air stream and soda lime removes CO
2
from the air.
During the Zero process, the Drierite adds in a small bit
of CO
2
and the soda lime adds a small bit of H
2
O which
is why Molecular Sieve desiccant is required. After
passing Zero air through the soda lime and Drierite, the
air finally passes through Molecular Sieve which
absorbs any remaining traces of CO
2
and H
2
O for very
accurate Zero.
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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