20
FUNCTIONAL DESCRIPTION HI 8720
ORP CONTROLLER
Keypad
SET
To set the working point of ORP
dosage
MEASURE
To set HI 8720 on measurement
mode and to enable the diag-
nostic tests
∆∆∆∆∆
Al
To display and to set the toler-
ance of the alarm points
0 mV TEST To verify the instrument calibra-
tion at point 0
500 mV TEST To verify the slope at point
500 mV
FRONT PANEL
SLOPE
DOSAGE
OXID.
REDUC.
∆
AL
COARSE
SET
FINE
∆
AL
MEA
SURE
SET
0 mV
TEST
500 mV
TEST
mV
HI 8720E
ORP