OPERATION
• Remove the protective cap and turn
ORP
on with by sliding the ON/OFF
switch on the top of the meter.
• Immerse it into the solution to
be tested, without exceeding the
maximum immersion level.
• Stir gently and wait for stable reading.
• After use, rinse the electrode with tap water and
replace the protective cap.
MAINTENANCE
• Check the meter by im-
mersing it in
HI7021
test
solution. The reading should
be between 240±20 mV at
25
ºC (
77
ºF).
Otherwise clean the electrode
platinum tip by rubbing it
with a lint-free cloth soaked
with
HI7061
cleaning solu-
tion.
• For more accurate readings, condition the meter
by immersing it in a pretreatment reducing
(
HI7091
) or oxidizing (
HI7092
) solution for
about 30 minutes before taking measurements.
• In case of erroneous readings even after an
accurate conditioning and calibra-
tion, the reference junction might
be contaminated or clogged.
• Pull out 2 mm (1/8’’)
of the cloth junction
to renew the electrode
reference (it is recom
-
mended to cut the cloth
leaving always at least
2 mm -1/8’’ over the
reference compartment).
Repeat the maintenance and conditioning
procedure.
The cloth junction can be pulled out approxi-
mately 20 times. After that, the electrode should
be replaced.
ELECTRODE REPLACEMENT
For replacing the electrode, contact your local
Hanna Instruments Office.
BEPS & BATTERY REPLACEMENT
The meter is provided with BEPS (Battery Error
Prevention System) which avoid any erroneous
reading due to low battery level, by automatically
switching the meter off.
To replace the batteries, slide off the battery
compartment cover and replace all four 1.5V
alkaline batteries, while paying attention to the
correct polarity.
Batteries should only be replaced in a non-
hazardous area and using the battery type specified
in this instruction manual.
