40
Use a small screwdriver to adjust the trim-
mers "
∆
AL" until the desired tolerance is
displayed.
For example:
in HI 8710 if the set value is pH 3 and a
∆
Alarm of 1.5 pH is chosen, the instrument
gives an alarm every time the measured pH
value is higher than 4.5 pH or lower than
1.5 pH.
In HI 8711 if the set values are pH 7 and pH 8
and a
∆
Alarm of 1.5 pH is chosen, the instru-
ment gives an alarm every time the measured
pH value is higher than 9.5 pH or lower than
5.5 pH.
In HI 8720 if the set value is 300 mV and the
∆
Alarm of 100 mV is chosen, the instrument
gives an alarm every time the measured ORP
value is higher than 400 mV or lower than
200 mV.
MEASUREMENTS
After setting the pH or ORP
value and the eventual alarm
immerse the electrode in the
test solution and press the
"MEASURE" key.
The actual pH or ORP value of the test solu-
tion is displayed.
∆
AL
∆
AL
pH
COARSE
SET
FINE
MEA
SURE
pH
mV
