17
To enter Rel mV operation press
2nd
and
Mode
from mV measurement.
• Place the ORP electrode into solution or
standard.
• Wait for a stable mV to be displayed.
• Press
CAL
when the instrument is in
RELATIVE mV measurement mode. The
relative mV value is displayed on the
primary LCD and the absolute mV value
on the secondary LCD.
• Use the
ARROW
keys to change the displayed relative mV value.
• When the reading is stable, in mV range and the Relative mV offset
is inside the offset window (±2000 mV), “
CFM
” tag blinks
.
• Press
CFM
to confirm the relative mV calibration. The instrument will
return to measurement mode.
• If the absolute mV reading is out of range or the Relative mV offset
is out of the offset window, “
WRONG
” tag will blink. Verify sensor tip
is fully submersed in solution and electrode is fully plugged in.
RELATIVE
RELATIVE
RELATIVE
RELATIVE
RELATIVE m
m
m
m
mV CALIBRATION
V CALIBRATION
V CALIBRATION
V CALIBRATION
V CALIBRATION
(HI 981
(HI 981
(HI 981
(HI 981
(HI 98150
50
50
50
50 & HI 981
& HI 981
& HI 981
& HI 981
& HI 98160
60
60
60
60)))))
However, temperature correction during pH measurements provides
values at the temperature of measurement. Actual pH values may differ
if measured at two different temperatures.
