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SETPOINT ADJUSTMENT
The electrode and the ground probe (if in use) have to be properly
installed and calibration performed.
FOR HI9910
Set the SET/READ switch to “SET” posi-
tion; the display shows the previously set
value (e.g. pH8.00).
Using a small screwdriver, first adjust the value through the COARSE
trimmer and then tune it through the FINE trimmer until the desired
setpoint value is displayed (e.g. pH6.00).
DOSING SELECTION
Select the desired dosing, acid or alkaline, through
the ALK/ACID switch.
To dose acidic substances/solutions and lower the
pH value, set the selector switch to “ACID”; to dose
bases or alkaline solutions and increase the pH value,
select “ALK”.
Dosing acidic solution, example
Setpoint = pH6.00
Measured value = pH7.00
To reach the setpoint value it is necessary to dose acid: move the switch
to “ACID” position.
Dosing alkaline solution, example
Setpoint = pH6.00
Measured value = pH4.00
To reach the setpoint value it is necessary to dose base: move the
switch to “ALK” position.
