ABB AX410 User Manual page 10

Single and Dual Input Analyzers for Low Level Conductivity
AX410, AX411, AX413, AX416, AX418, AX450, AX455 & AX456
Calculations
A range of computed dual conductivity readings can be displayed, each showing the result of a calculation performed by the analyzer.
In each case, the type of calculation is shown on the lower display line, followed by the result of the calculation.
Calculations performed are:
Difference = A - B
% Rejection = (1-B/A) x 100
% Passage = B/A x 100
Ratio = A/B
Inferred pH = Uses an algorithm to calculate the pH value of the solution, inferred from its conductivity,
in the range 7.00 to 11.00 pH. see appendix A.3 on page 75 for further information on inferred pH.
Note. If the analyzer is used with a cation resin column, Sensor A must be installed before the column and Sensor B after the
column for the calculations, especially inferred pH, to be correct.
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2 OPERATION
IM/AX4CO Issue 11