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BATTERY REPLACEMENT
The meter displays the remaining battery percent-
age every time it is switched on. When the battery
level is below 5%, the
- +
symbol on the bottom
left of the LCD lights up to indicate a low battery
condition. The batteries should be replaced soon.
If the battery level is low enough to cause errone-
ous readings, the meter shows “0%” and the Battery
Error Prevention System (BEPS) will automatically
turn the meter off.
To change the batteries, remove the 4 screws lo-
cated on the top of the meter.
Once the top has been removed, carefully replace
the 4 batteries located in the compartment while
paying attention to their polarity.
ELECTRODE MAINTENANCE
• When not in use, rinse the electrode with water
to minimize contamination and store it with a few
drops of HI 70300 storage solution in the pro-
tective cap after use. DO NOT USE DISTILLED
OR DEIONIZED WATER FOR STORAGE PUR-
POSES.
• If the electrode has been left dry, soak in
storage solution for at least one hour to reacti-
vate it.
• To prolong the life of the electrode, it is recom-
mended to clean it monthly by immersing it in the
HI 7061 cleaning solution for half an hour.
Afterwards, rinse it thoroughly with tap water.
• The ORP electrode can be easily replaced by
using the supplied tool (HI 73128). Insert the tool
into the electrode cavity as shown below.
Rotate the electrode counterclockwise.
Pull the electrode out by using the other side of the
tool.
Insert a new ORP electrode following the above
instructions in reverse order.
SPECIFICATIONS
To turn the meter on and to check battery status
Press and hold the /MODE button until the LCD
lights up. All the used segments on the LCD will
be visible for 1 second (or as
long as the button is pressed),
followed by the percent indi-
cation of the remaining battery
life (E.g. % 100 BATT).
Taking measurements
Submerge the electrode in the solution to be
tested while stirring it gently. The measurements
should be taken when the stability symbol on
the top left of the LCD disappears.
The ORP (mV) value is shown
on the primary LCD while the
secondary LCD shows the tem-
perature of the sample.
To freeze the display
While in measurement mode,
press the SET/HOLD button.
HOLD appears on the sec-
ondary display and the reading
will be frozen on the LCD (E.g.
mV 825 HOLD).
Press any button to return to normal mode.
OPERATIONAL GUIDE
The ORP range is factory calibrated.
Contact your nearest Hanna Service Center for
recalibration, if necessary.
FACTORY RECALIBRATION
Setup mode allows the selection of temperature
unit.
To enter the Setup mode, °C/°F selection, press
the /MODE button until TEMP and the current
temperature unit are displayed on the lower part
of the LCD (E.g. TEMP °C).
Use the SET/HOLD button to change the tem-
perature unit, and then press the /MODE button
to return to the normal measuring mode.
SETUP
ACCESSORIES
HI 73120 Replaceable ORP electrode
HI 73128 Electrode removal tool
HI 7021M ORP test solution (240 mV), 230 mL bottle
HI 7022M ORP test solution (470 mV), 230 mL bottle
HI 7061M Electrode cleaning solution, 230 mL bottle
HI 70300M Electrode storage solution, 230 mL bottle
HI 7091M Pretreatment reducing solution, 230 mL
bottle
HI 7092M Pretreatment oxidizing solution, 230 mL
bottle
HANNA WATERPROOF TESTERS
Hanna offers a complete line of waterproof,
microprocessor-based testers for measurement of
pH, Temperature, EC, TDS and ORP.
Choose the instruments which best meet your
needs:
• HI 98120 ORP (mV) and Temperature (°C
& °F)
• HI 98121 pH (0.01 resolution), ORP (mV)
and Temperature (°C & °F)
• HI 98127 pH (0.1 resolution) and Tem-
perature (°C & °F)
• HI 98128 pH (0.01 resolution) and Tem-
perature (°C & °F)
• HI 98129 pH (0.01 resolution), EC/TDS
Low Range (µS/cm & ppm) and
Temperature (°C & °F)
• HI 98130 pH (0.01 resolution), EC/TDS
High Range (mS/cm & ppt) and
Temperature (°C & °F)
• HI 98311 EC/TDS Low Range (µS/cm &
ppm) and Temperature (°C & °F)
• HI 98312 EC/TDS High Range (mS/cm &
ppt) and Temperature (°C & °F)
Range
Resolution
Accuracy
(@20°C/68°F)
Typical EMC
Deviation
Environment
Calibration
Electrode
Battery Type
Life
Auto-off
Dimensions
Weight
± 1000 mV
-5.0 to 60.0°C/23.0 to 140.0°F
1 mV
0.1°C / 0.1°F
±2 mV
±0.5°C / ±1°F
±2 mV
±0.3°C / ±0.6°F
-5 to 50°C (23 to 122°F);
RH 100%
factory calibrated
HI 73120 ORP electrode
(included)
4 x 1.5V with BEPS
typical 300 hours
After 8 minutes
163 x 40 x 26 mm
(6.4 x 1.6 x 1.0”)
85 g (3.0 oz)
ORP:
Temp:
ORP:
Temp:
ORP:
Temp:
ORP:
Temp:
To turn the meter off
While in normal measuring mode, press the /
MODE button. OFF will appear on the secondary
display. Release the button.
Note:
If measurements are taken in different samples
successively, rinse the probe thoroughly to elimi-
nate cross-contamination; and after cleaning, rinse
the probe with some of the sample to be mea-
sured.
Replace the top, making sure that the gasket is prop-
erly seated in place, and tighten the screws to ensure
a watertight seal.