2-Electrode Conductivity - Dual Input Calculated Values Setup - ABB AWT420 Commissioning Instructions

28 AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | C I/A W T4 2 0 - E N R E V. B
...10 Sensor setup
2-electrode conductivity – dual input calculated values setup
Menu Comment
Calculation Type
Calculations are performed using the inputs from both sensors.
Select the required calculation from the following options:
No Calculation/Inferred pH (NaOH)/Inferred pH (NaOH+NaCl)/Inferred pH (NH3)/
Inferred pH (NH3+NaCl)/Difference/Ratio/% Passage/% Rejection
Inferred pH (NaOH)
Calculates a pH value in the range 7.00 to 11.00 pH based on the type of chemical dosing and the
conductivity readings.
Note: The temperature compensation characteristic TC Curve for signal B should be set to NaOH.
Inferred pH (NaOH+NaCl)
Calculates a pH value in the range 7.00 to 11.00 pH based on the type of chemical dosing and the
conductivity readings.
Note: The temperature compensation characteristic TC Curve for signal A should be set to NaCl.
Note: The temperature compensation characteristic TC Curve for signal B should be set to NaOH.
Inferred pH (NH3)
Calculates a pH value in the range 7.00 to 10.00 pH based on the type of chemical dosing and the
conductivity readings.
Note: The temperature compensation characteristic TC Curve for signal B should be set to NH3.
Inferred pH (NH3+NaCl)
Calculates a pH value in the range 7.00 to 10.00 pH based on the type of chemical dosing and the
conductivity readings.
Note: The temperature compensation characteristic TC Curve for signal A should be set to NaCl.
Note: The temperature compensation characteristic TC Curve for signal B should be set to NH3.
Difference
Calculates the difference between the two conductivity inputs:
Difference = B — A
Ratio
Calculates the ratio of the two conductivity inputs:
Ratio =
% Passage
Calculates the amount of conductivity as a percentage that passes through the cation exchange unit:
%Passage =
% Rejection
Calculates the amount of conductivity as a percentage that is absorbed in the cation exchange unit:
%Rejection =
Note . The following menus are displayed only if Calculation Type = Inferred pH.
Before Cation Limit Set the required before-cation conductivity limit, between:
• 0.000 and 100.0 μS/cm
• 0.000 and 100.0 μS/cm
• 0.000 and 25.00 μS/cm
• 0.000 and 25.00 μS/cm
After Cation Limit Set the required before-cation conductivity limit, between:
• 1.000 and 100.0 μS/cm
• 1.000 and 250.0 μS/cm
• 0.060 and 10.00 μS/cm
• 0.060 and 25.00 μS/cm
pH Range
View the measuring range for the selected Inferred pH calculation
• 7.00 to 11.00 pH
• 7.00 to 11.00 pH
• 7.00 to 10.00 pH
• 7.00 to 10.00 pH
Signal Arrangement Set the signal arrangement:
• A = S1, B = S2/A = S2, B = S1
Note: For inferred pH:
• A = Conductivity measurement After cation column.
• B = Conductivity measurement Before cation column.
B
A
A
B 100
A
( (
1
100
B
Inferred pH (NaOH)
Inferred pH (NaOH+NaCl)
Inferred pH (NH3)
Inferred pH (NH3+NaCl)
Inferred pH (NaOH)
Inferred pH (NaOH+NaCl)
Inferred pH (NH3)
Inferred pH (NH3+NaCl)
Inferred pH (NaOH)
Inferred pH (NaOH+NaCl)
Inferred pH (NH3)
Inferred pH (NH3+NaCl)
Default
No Calculation
N/A
N/A
N/A
N/A