Hanna Instruments HI 9910 - Manual (Page 25)

25
650
Using a small screwdriver, adjust the “ALKALINE SET” trimmers. First
adjust the “COARSE” trimmer and then fine tune with the “FINE”
trimmer (see 3 and 4 - Functional Diagram) until the desired set
value is displayed (e.g. pH 5.00).
NOTE:
• The “FINE” trimmer can adjust up to ±1.5 pH.
• Should you use the
HI 9911 for a single-point dosage, it is
recommended to adjust the “ALKALINE SET” trimmers to 0.00 pH
if you are dosing acid solutions to lower the pH and adjust the
“ACID SET” trimmers to your desired values. Likewise, when
dosing only base solutions, set the “ACID SET” trimmers to 14.00
pH and adjust the “ALKALINE SET” trimmers to your desired
value.
FOR HI 9920
Turn the switch to the "SET" position (see 7 - Functional Diagram).
The display will show the previously adjusted value (e.g. mV 650).
Using a small screwdriver, first adjust the setpoint through the
“COARSE” trimmer and then fine tune it with the “FINE” trimmer (see
3 and 4 - Functional Diagram) until the desired set value is
displayed (e.g. mV 700).
SET
READ
COARSE FINE CAL
mV
ORP
SET POINT
680
COARSE FINE CAL
mV
ORP
SET POINT
700
pH
COARSE FINE SLOPE OFFSET
ALKALINE SET
ACID SET
pH
COARSE FINE SLOPE OFFSET
ALKALINE SET
ACID SET
5.18 5.00