Myron L POOLPRO PS9TKB, Operation Manual

Page: 22 / 74

18
G. LSI Calculator Functions
The Ultrameter III features an LSI Calculator that can be used to perform
actual LSI or for hypothetical water balance calculations.
The LSI Calculator computes a Langelier Saturation Index value using
measured, default, or user-adjusted values for alkalinity, hardness, pH
and temperature.
If you have stored alkalinity, hardness or pH and temperature values,
the calculator will automatically display the most recent stored value. All
other values will display as default. You can adjust any or all of the values
displayed to determine the effect of the change(s) on the LSI value.
1.
Measuring LSI
To compute the actual saturation index of a solution:
Before you enter the calculator function, you must measure and store
values for all water balance variables used by the calculator to compute
saturation index.
1. Perform an alkalinity titration of the sample solution (ref.
Measuring Alkalinity, pg. 14). Press MS to store the reading in
memory.
2. Perform a hardness titration of the sample solution (ref.
Measuring Hardness, pg. 16). Press MS to store the reading in
memory.
3. Measure the pH of the sample solution (ref. Measuring pH, pg.
19) Press MS to store the reading in memory.
4. Press .
5. The last stored alkalinity value is displayed.
6. Press CAL to accept value and advance to the hardness value
screen. The last stored hardness value is displayed.
7. Press CAL to accept value and advance to the pH value screen.
The last stored pH value is displayed.
8. Press CAL to accept value and advance to the temperature
value screen. The last stored temperature value (taken from
the last stored hardness or alkalinity titration) is displayed.
9. Press CAL to accept and calculate LSI. The saturation index
value will display. Press MS to store the reading. The unit will
automatically power off after the period of inactivity defined in
the AUTO OFF setting (ref. AUTO OFF, pg. 43).