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Operating the Analyzer
38 UDA2182 Universal Dual Analyzer Product Manual January 2009
Degassed CO
2
The dual input UDA can also be configured for degassed CO
2
measurement by
employing cells #2 and #3. Here the cation effluent stream is degassed of CO
2
, typically
by heating the cation effluent stream to a near boiling temperature. This heating step
results in CO
2
out-gassing. The resulting 25°C compensated conductivity measurement
of Cell #3 is lower in value in proportion to the amount of dissolved CO
2
.
5.9.3 pH Calculation from Specific and Cation Conductivity Setup
Connect cell 1 to input 1 and cell 2 to input 2. Follow the appropriate instructions to
configure the UDA for Cation Calc (See Section 6.18 – Maintenance Configuration.)
Under the sub menu selection of Inputs, the Cation Calc parameter offers two possible
selections.
1. pH Ammonia: Specific conductivity temperature compensation assumes
ammonia (NH
3
) is the base reagent. In addition to display of conductivity
values, this selection provides for determination and display of solution
pH value.
2. pH Amine pH: Specific conductivity temperature compensation assuming
a generic amine base. These include any one or combination of the
following amines:
Hydrazine
Morpholine
Ethanolamine
Aminomethylpropanol
Methoxypropylamine
4-aminobutanol
5-aminopentanol
Diaminopropane
Cyclohexylamine
Methylamine
Dimethylamine
1,5-diaminopentane
Piperidine
Pyrrolidine
This generic selection employs ammonia temperature compensation and
optimizes pH calculation for these base reagents.