Hanna Instruments HI 98201 - Manual (Page 2)

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 maxi-
mum 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 HI 7020 test
solution. The reading
should be between 200
and 275 mV at 20ºC
(68ºF).
Otherwise clean the elec-
trode platinum tip by rub-
bing it with a lint-free
cloth soaked with HI 7061
cleaning solution.
• For more accurate readings, condition the meter
by immersing it in a pretreatment reducing
(HI 7091) or oxidizing (HI 7092) solution for
about 30 minutes before taking measure-
ments.
• In case of erroneous readings even after an
accurate conditioning and calibration, the ref-
erence junction might be contaminated or
clogged.
• Pull out 2 mm (1/8'') of
the cloth junction to re-
new the electrode refer-
ence (it is recommended
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 Dealer or
the nearest Hanna Service Center.
BEPS & BATTERY REPLACEMENT
The meter is provided with BEPS (Battery Error
Prevention System) which avoid any erroneous
reading due to low battery level, by automati-
cally 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.