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Notes:
• The “FINE” trimmer can adjust up to ±1.5 pH.
• If the
HI9911
is used for a single-point dosage, it is recommended
to operate as follows:
if dosing acid solution, adjust the “ALKALINE SET” trimmers to 0.00
pH and set the “ACID SET” trimmers to the desired value;
if dosing alkaline solution, adjust the “ACID SET” trimmers to 14.00
pH and set the “ALKALINE SET” trimmers to the desired value.
FOR HI9920
Set the SET/READ switch to “SET” position; the display shows the
previously set value (e.g. mV650).
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. mV700).
DOSING SELECTION
Select the desired dosing, reductant or oxidant, through
the OXID/RED switch.
For reducing dosage and lowering the mV value, set
the selector switch to “RED”; for oxidizing dosage and
increasing the mV value, select “OXID”.
Dosing reducing substances, example
Setpoint = mV650
Measured value = mV700
Move the switch to “RED” position.
Dosing oxidizing substances, example
Setpoint = mV650
Measured value = mV500
Move the switch to “OXID” position.
