CIRAS-3 Operation Manual V. 1.09
175
90
Diff-Bal (H
2
O) Out of Range [90]
The DIFF BAL value for H2Or is > 0.5 mb. Typically
this is due to inaccurate recalibration or deterioration
of the internal sample cell due to dust, dirt, water. It
might just be a transient message that disappears
and if it does you are ok. If the message does not
disappear after 5-6 seconds perform a manual Diff
Bal (
Z-Diff Bal F7) > Zero
). If problem persists
contact PP Systems. Also ensure that all desiccants
are fresh and that the absorber columns are firmly
seated in their respective manifolds.
91
Cuvette Flow 20% out from set value
[91]
Normally this is just a transient and the message
disappears after 5 or 6 seconds and is quite
common after a change in flow rate. If the message
does not disappear check for restrictions in the gas
circuit associated with the ASU pump (kinked
piping).
92
Zero too Low [92]
Exhausted chemicals in the Zero column. Replace
soda lime, Drierite and especially the Molecular
Sieve.
93
Board supply voltage < 6.4 V [93]
Internal battery(s) are low. Charge the battery(s)
using the power supply adapter provided by PP
Systems.
94
Flow Rate through the Reference Cell
too High [94]
Check the reference pump (including electrical
connection) and any kinks that might be causing
restriction. Clean or replace the reference pump.
See
Servicing the Air Sampling Pump (Reference &
On page 181. Also check that the Zero
and CO
2
/H
2
O control manifolds are properly seated
in their respective manifolds and all associated “O”
rings are not pinched off or cracked. Also check the
internal hydrophobic filter.
Code
Description
What it means / Action
