Owner manual


There is a ratio of TDS to compensated conductivity for any solution,
which varies with concentration. The ratio is set during calibration in User

A truly unknown solution has to have its TDS determined by evaporation
and weighing. Then the solution whose TDS is now known can be
measured for conductivity and the ratio calculated. Next time the same
solution is to be measured, the ratio is known.
XXIII. pH and ORP (6Pfc)
A. 
1. 


the effective, not the total, acidity of a solution.


needed quantitative information by expressing the degree of activity of
an acid or base.
    

because the very few ions take time to accumulate.
 
The acidity or alkalinity of a solution is a measurement of the relative
   

   
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  



-

          
of water, and balance would be 10
-




-







, solutions are less acidic than
neutral, and therefore are alkaline. A concentration of 10







-


3. 

receptive to hydrogen ions. Available hydrogen ions in a solution will
accumulate on this surface and a charge will build up across the glass
interface. The voltage can be measured with a very high impedance
voltmeter circuit; the dilemma is to connect the voltmeter to solution on
each side.
The glass surface encloses a captured solution of potassium chloride
holding an electrode of silver wire coated with silver chloride. This is
