Hanna Instruments | HI98127,HI98128 | Owner Manual | Hanna Instruments HI98127,HI98128 Owner Manual

Hanna Instruments HI98127,HI98128 Owner Manual
Operational Guide
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”).
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.
To turn the meter off
While in normal mode, press the /MODE button. “OFF” will
appear on the secondary display. Release the button.
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
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:
• 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.
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.
• 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
Insert the tool into the electrode
cavity as shown above.
Rotate the electrode
Pull the electrode out by using the other side of the tool. Insert
a new pH electrode following the above instructions in reverse
Battery Replacement
The meter displays the remaining battery percentage
every time it is switched on. When the battery level is below 5%,
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).
fig. 1
fig. 2
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.
Replaceable pH electrode
Electrode removal tool
pH Buffer Solution
pH 4.01 solution, 20 mL sachet (25 pcs.)
pH 6.86 solution, 20 mL sachet (25 pcs.)
pH 7.01 solution, 20 mL sachet (25 pcs.)
pH 9.18 solution, 20 mL sachet (25 pcs.)
pH 10.01 solution, 20 mL sachet (25 pcs.)
pH 10.01 & 7.01 solution, 20 mL sachets
(10 pcs., 5 ea.)
pH 4.01 & 7.01 solutions, 20 mL sachet
(10 pcs., 5 ea.)
Electrode Cleaning Solution
Electrode cleaning solution, 230 mL bottle
Electrode Storage Solution
Electrode storage solution, 230 mL bottle
Other Accessories
HI740026P Replacement 1.5V batteries (12 pcs.)
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.
IST98127 06/18
HI98127 • HI98128
Waterproof pH Testers with Replaceable
Thank You
Functional Description
Thank you for choosing a Hanna Instruments product. Please read
this instruction manual carefully before using the instrument.
For more information about Hanna Instruments and our products,
visit www.hannainst.com.
Liquid Crystal
For technical support, contact your local Hanna Instruments
Office or email us at tech@hannainst.com
Find your local Hanna Instruments Office at www.hannainst.com
(@25 °C / 77 °F)
Remove the instrument from the packing material and examine
it carefully to make sure that no damage has occurred during
shipment. If noticeable damage is evident, contact your local Hanna
Instruments Office.
HI73127 pH electrode
HI73128 electrode removal tool
1.5V batteries (4 pcs.)
Instruction manual
Calibration card
Note: Save all packing material until you are sure that the
instrument functions correctly. All defective items must be
returned in the original packing together with the supplied
HI73127 pH
LCD Description
General Description
HI98127 (pHep®4) and HI98128 (pHep®5) are waterproof
pH and temperature meters. The housing has been completely
sealed against humidity and designed to float. All pH readings are
automatically temperature compensated (ATC), and temperature
values can be displayed in °C or °F units.
These meters can be calibrated at one or two points with autobuffer recognition and against five memorized buffer values. A
stability indicator is displayed on the LCD to ensure measurements
are highly accurate.
At start-up, these meters indicate battery level and will display a
low battery symbol to alert the user if the batteries need to be
replaced. In addition, the Battery Error Prevention System (BEPS)
avoids erroneous readings by turning the meter off when battery
voltage levels are too low.
The included HI73127 pH electrode can be easily replaced and the
stainless steel encapsulated temperature sensor facilitates faster
and more accurate temperature measurement and compensation.
1. ATC (Automatic Temperature Compensation) indicator
2. Stability indicator
3. Battery life percentage indicator
4. Low battery indicator
5. Secondary display
6. Primary display
7. Measuring unit for primary display
Hanna Instruments reserves the right to m odify the design, construction, or
appearance of its products without advance notice.
All rights are reserved. Reproduction in whole or in part is prohibited without the
written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode
Island, 02895, USA.
-2.0 to 16.0 pH (HI98127)
-2.00 to 16.00 pH (HI98128)
-5.0 to 60.0 °C /
23.0 to 140.0 °F
0.1 pH (HI98127)
0.01 pH (HI98128)
0.1 °C / 0.1 °F
±0.1 pH (HI98127)
±0.05 pH (HI98128)
±0.5 °C / ±1.0 °F
Battery Type
Battery Life
-5 to 50 °C (23 to 122 °F); RH 100%
1 or 2 points with 2 sets of memorized
buffers (pH 4.01 / 7.01 / 10.01 or
pH 4.01 / 6.86 / 9.18)
HI73127 pH electrode (included)
1.5V (4 pcs.)
with BEPS / approx. 300 hours
after 8 minutes of non-use
171 x 41 x 26 mm (6.7 x 1.6 x 1.0”)
84 g (3.0 oz)
Each meter is supplied with:
Preliminary Examination
For better accuracy, frequent calibration of the instrument is
recommended. In addition, the instrument must be recalibrated
a) The pH electrode is replaced.
b) After testing aggressive chemicals.
c) Where high accuracy is required.
d) At least once a month.
Calibration procedure
From normal measuring mode, press and hold the /MODE button
until “OFF” on the secondary LCD is replaced by “CAL”. Release
the button. The LCD enters the calibration mode displaying “pH
7.01 USE” (or “pH 6.86 USE” if the NIST buffer set was selected).
After 1 second the meter activates the automatic buffer recognition
feature. If a valid buffer is detected then its value is shown on
the primary display and “REC” appears on the secondary LCD. If
no valid buffer is detected, the meter keeps the “USE” indication
active for 12 seconds, and then it replaces it with “WRNG”,
indicating the sample being measured is not a valid buffer.
For a single-point calibration with buffers pH 4.01, 9.18 or 10.01,
the meter automatically accepts the calibration when the reading
is stable; the meter displays the accepted buffer, with the message
“OK 1”. After 1 second the meter automatically returns to the
normal measuring mode. If a single-point calibration with buffer
pH 7.01 (or pH 6.86) is desired, then after the calibration point
has been accepted the /MODE button must be pressed in order to
return to normal mode. After the button is pressed, the meter shows
“7.01” (or “6.86”) - “OK 1” and, after 1 second, it automatically
returns to the normal measuring mode.
Note: A two-point calibration is recommended for better
For a two-point calibration, place the electrode in pH 7.01 (or pH
6.86) buffer. After the first calibration point has been accepted,
the “pH 4.01 USE” message appears. The message is held for
12 seconds, unless a valid buffer is recognized. If no valid buffer is
recognized, then the “WRNG” message is shown.
If a valid buffer (pH 4.01, 9.18 or 10.01) is detected, then the meter
completes the calibration procedure. When the buffer is accepted,
the LCD shows the accepted value with the “OK 2” message, and
then the meter returns to the normal measuring mode.
Note: When the calibration procedure is completed, the “CAL”
tag is turned on.
To quit calibration and reset to default values
• After entering the calibration mode and before the first point is
accepted, it is possible to quit the procedure and return to the last
calibration data by pressing the /MODE button. The secondary LCD
displays “ESC” for 1 second and the meter returns to the normal
measuring mode.
• To reset to the default values and clear a previous calibration,
press the SET/HOLD button after entering the calibration mode
and before the first point is accepted. The secondary LCD displays
“CLR” for 1 second, the meter resets to the default calibration
and the “CAL” tag on the LCD disappears.
Recommendations for Users
Before using Hanna Instruments products, make sure that they
are entirely suitable for your specific application and for the
environment in which they are used. Any variation introduced by the user to the supplied equipment may degrade the
meter' s performance. Avoid touching the electrode area. To avoid
damages or burns, do not put the meter in microwave oven. For
yours and the meter's safety do not use or store the meter in
hazardous environments.
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