INSTRUCTION MANUAL
IST98127 06/18
HI98127 • HI98128
Waterproof pH Testers with Replaceable
Electrode
Warranty
HI98127
and
HI98128
are warranted for a period of one year
against defects in workmanship and materials when used for their
intended purpose and maintained according to instructions. The
electrode is warranted for a period of six months. This warranty
is limited to repair or replacement free of charge. Damage due to
accidents, misuse, tampering or lack of prescribed maintenance
is not covered. If service is required, contact your local Hanna
Instruments Office. If under warranty, report the model number,
date of purchase, serial number and the nature of the problem.
If the repair is not covered by the warranty, you will be notified of
the charges incurred. If the instrument is to be returned to Hanna
Instruments, first obtain a Returned Goods Authorization (RGA)
number from the Technical Service department and then send it
with shipping costs prepaid. When shipping any instrument, make
sure it is properly packaged for complete protection.
pH Electrode Maintenance
• When not in use, rinse the electrode with water to minimize
contamination and store it with a few drops of HI70300 storage
solution in the protective cap.
DO NOT USE DISTILLED OR DEIONIZED WATER FOR STORAGE
PURPOSES.
• If the electrode has been left dry, soak in storage solution for
at least one hour to reactivate it.
• To prolong the life of the pH electrode, it is recommended
to clean it monthly by immersing it in the HI7061 cleaning
solution for half an hour. Afterwards, rinse it thoroughly with
tap water and recalibrate the meter.
The pH electrode can be easily replaced by using the supplied tool
(HI73128).
Rotate the electrode
counterclockwise.
Pull the electrode out by using the other side of the tool. Insert
a new pH electrode following the above instructions in reverse
order.
To turn the meter on and check the 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 indication of the
remaining battery life (E.g. “% 100 BATT”).
Operational Guide
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 pH value automatically compensated for
temperature is shown on the primary LCD while the secondary LCD
shows the temperature of the sample.
To freeze the display
While in measurement mode, press the
SET/HOLD button. “HOLD“ appears on the
secondary display and the reading will be
frozen on the LCD (E.g. “pH 5.78 HOLD”). Press
any button to return to normal mode.
Notes: Before taking any measurements make sure the
meter has been calibrated (“CAL” tag present on the LCD).
If measurements are taken in different samples successively,
rinse the probe thoroughly to eliminate cross-contamination and
after cleaning, rinse the probe with some of the sample to be
measured.
Setup
Setup mode allows the selection of temperature unit and pH buffer
set. To enter the Setup mode, press the /MODE button until “CAL”
on the secondary display is replaced by “TEMP” and the current
temperature unit (E.g. “TEMP °C”). Then:
Electrode
Code
Description
HI73127
Replaceable pH electrode
HI73128
Electrode removal tool
pH Buffer Solution
Code
Description
HI70004P
pH 4.01 solution, 20 mL sachet (25 pcs.)
HI70006P
pH 6.86 solution, 20 mL sachet (25 pcs.)
HI70007P
pH 7.01 solution, 20 mL sachet (25 pcs.)
HI70009P
pH 9.18 solution, 20 mL sachet (25 pcs.)
HI70010P
pH 10.01 solution, 20 mL sachet (25 pcs.)
HI770710P
pH 10.01 & 7.01 solution, 20 mL sachets
(10 pcs., 5 ea.)
HI77400P
pH 4.01 & 7.01 solutions, 20 mL sachet
(10 pcs., 5 ea.)
Electrode Cleaning Solution
Code
Description
HI7061M
Electrode cleaning solution, 230 mL bottle
Electrode Storage Solution
Code
Description
HI70300M
Electrode storage solution, 230 mL bottle
Other Accessories
Code
Description
HI740026P
Replacement 1.5V batteries (12 pcs.)
Accessories
Battery Replacement
The meter displays the remaining battery percentage
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 erroneous readings, the meter
shows “% 0 BATT” and the Battery Error Prevention System (BEPS)
will automatically turn the meter off. To change the batteries, remove
the 4 screws located on the top of the meter (fig. 1).
Once the top has been removed, carefully replace the
4 batteries located in the compartment while paying
attention to their polarity (fig. 2).
Replace the top, making sure that the gasket is properly seated in
place, and tighten the screws to ensure a watertight seal.
Note: Batteries should only be replaced in a safe area using the
battery type specified in this instruction manual. Old batteries
should be disposed in accordance with local regulations.
• for °C / °F selection: Use the SET/HOLD button. After the
temperature unit has been selected, press the /MODE button
to enter the buffer set selection mode; press the /MODE
button twice to return to the normal measuring mode.
• to change the calibration buffer set: After setting the
temperature unit, the meter will show the current buffer set:
“pH 7.01 BUFF” (for pH 4.01 / 7.01 / 10.01) or “pH 6.86
BUFF” (for NIST 4.01 / 6.86 / 9.18). Change the set with the
SET/HOLD button, then press /MODE to return to normal
measuring mode.
fig. 1
fig. 2
To turn the meter off
While in normal mode, press the /MODE button. “OFF” will
appear on the secondary display. Release the button.
^
Insert the tool into the electrode
cavity as shown above.
