Hanna instruments HI 9026 User Manual

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Instruction Manual

HI 9026

Calibration Check

Waterproof

pH/mV/ºC Meter

Singapore:

Tel. [phone]  Fax [phone]

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Tel. [phone]  Fax [phone]

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Tel. [phone]  Fax [phone]

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For e-mail contacts and a complete list of Sales and
Technical offices, please see www.hannainst.com.

28

MAN9026

01/05

www.hannainst.com

1

Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct

use of the instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e-mail

us at [e-mail] or turn to the back cover for our
worldwide contact list.
This instrument is in compliance with directives.

WARRANTY

HI 9026 is guaranteed for two years against defects in workmanship
and materials when used for its intended purpose and maintained
according to instructions. Electrodes and probes are guaranteed for 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 the dealer from whom you purchased the
instruments. 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 instruments are to be returned to Hanna Instru­ments, first obtain a Returned Goods Authorization number from the
Technical Service department and then send it with shipping costs
prepaid. When shipping any instrument, make sure it is properly
packed for complete protection.

RECOMMENDATIONS FOR USERS

Before using this product, make sure that it is entirely suitable for the
environment in which it is used.

Operation of this instrument in residential areas could cause
unacceptable interferences to radio and TV equipment, requiring
the operator to follow all necessary steps to correct interferences.

The glass bulb at the end of the pH electrode is sensitive to
electrostatic discharges. Avoid touching this glass bulb at all times.

During operation, ESD wrist straps should be worn to avoid possible
damage to the electrode by electrostatic discharges.

Any variation introduced by the user to the supplied equipment may
degrade the instruments EMC performance.

To avoid electrical shock, do not use this instrument when voltages at
the measurement surface exceed 24 VAC or 60 VDC.

To avoid damage or burns, do not perform any measurement in
microwave ovens.

TABLE OF CONTENTS

WARRANTY .................................................................................. 2

PRELIMINARY EXAMINATION ......................................................... 3

GENERAL DESCRIPTION ................................................................. 3

FUNCTIONAL DESCRIPTION ........................................................... 4

SPECIFICATIONS........................................................................... 5

OPERATIONAL GUIDE.................................................................... 6

pH CALIBRATION ......................................................................... 9

pH BUFFER TEMPERATURE DEPENDENCE ....................................... 13

SETUP MENU ............................................................................. 14

mV CALIBRATION ....................................................................... 15

TEMPERATURE CALIBRATION ....................................................... 15

BATTERY REPLACEMENT ............................................................... 15

LCD MESSAGE GUIDE .................................................................. 16

TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ................ 17

ELECTRODE CONDITIONING & MAINTENANCE ................................ 18

TROUBLESHOOTING GUIDE ......................................................... 20

ACCESSORIES ............................................................................. 21

2

Hanna Instruments reserves the right to modify the design,

construction and appearance of its products without advance notice.

27

OTHER ACCESSORIES

HI 721317 Rugged carrying case
HI 740157 Plastic electrode refilling pipet (20 pcs)
HI 76405 Electrode holder
HI 7662 Stainless steel Temperature probe with 1 m (3.3')

screened cable

HI 8427 pH and ORP electrode simulator with 1 m (3.3')

coaxial cable ending in female BNC connectors

HI 931001 pH and ORP electrode simulator with LCD and 1 m

(3.3') coaxial cable ending in female BNC connectors

PRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it to
make sure that no damage has occurred during shipping.

If there is any damage, notify your dealer or the nearest Hanna
Customer Service Center.

The meter is supplied with:
 HI 1230B combination double-junction, gel pH electrode
 HI 7662 stainless steel temperature probe with 1 m (3.3') cable
 pH 4.01 & pH 7.01 buffer solutions (20 mL sachet)
 100 mL plastic beaker
 1.5V AA alkaline batteries (4 pcs)
 Instruction manual
 Rugged carrying case

Note: Save all packing material until you are sure that the instrument

functions correctly. All defective items must be returned in the
original packing with the supplied accessories.

GENERAL DESCRIPTION

HI 9026 is a state-of-the-art waterproof, heavy-duty pH meter designed to
provide laboratory results and accuracy under harsh industrial conditions.
This meter is provided with a series of new diagnostic features which
add an entirely new dimension to the measuremeny of pH, by
allowing the user to dramatically improve the reliability of the
measurement:
 7 memorized buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01

and 12.45) for calibration
 Custom calibration by entering up to two custom buffers
 Messages on the LCD to make the calibration easy and accurate
 Diagnostic features to alert the user when the electrode needs

cleaning
 Monitoring of the electrode aging
 User-selectable calibration time-out to remind when a new

calibration is necessary
HI 9026 can also measure with ORP electrodes, thanks to its capability
to measure mV with a resolution up to 0.1 mV.
Moreover, it offers an extended temperature range from 20 °C (4 °F)
to 120 °C (248 °F), using HI 7662 interchangeable probes.

26

3

FUNCTIONAL DESCRIPTION

110 mm

4.3"

12 mm

0.5"

HI 1413

150 mm

5.9"

12 mm

0.5"

"S" VERSION

HI 3131

120 mm

4.7"

12 mm

0.5"

HI 3230

"S" VERSION

120 mm

4.7"

12 mm

0.5"

HI 4430

"S" VERSION

HI1413B

Glass-body, single junction, flat tip, Viscolene, non-refillable, combination
pH electrode. Use: surface measurement.

ORP ELECTRODES

HI3131B

Glass-body, refillable, combination platinum ORP electrode.
Use: titration.

HI3230B

Plastic-body (Ultem®), gel-filled, combination platinum ORP electrode.
Use: general purpose.

HI4430B

Plastic-body (Ultem®), gel-filled, combination gold ORP electrode.
Use: general purpose.

1) BNC electrode connector.

2) Temperature probe socket.

3) Liquid Crystal Display (LCD).

4) RANGE key, to select pH or mV.

5) ON/OFF key, to turn the meter ON and OFF.

6) CAL key, to enter/exit calibration mode.

7) SETUP/CFM key, to enter setup mode or to confirm calibration.

8) UP and DOWN arrow keys, for manual temperature setting,

entering menu parameters or changing buffer values.

9) MR/CUSTOM BUF key, to recall the stored value from memory or

to enter custom buffer values.

10) MEM/CLR key, to store the reading in memory or to clear calibration.

11) LIGHT key, to toggle display backlighting.

12) Secondary display.

13) Primary display.

4

Consult the Hanna General Catalog for a complete and wide selection
of electrodes.

Ultem® is registered Trademark of General Electric Co.
Kynar® is registered Trademark of Pennwalt Corp.

25

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120 mm

4.7"

12 mm

0.5"

FC 100

75 mm

2.95"

6 mm

0.25"

FC 200

120 mm

4.7"

12 mm

0.5"

FC 210

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

FC 220

110 mm

4.3"

12 mm

0.5"

FC 911

FC100B

Plastic-body (Kynar®), double junction, refillable, combination pH
electrode.

Use: general purpose for food industry.

FC200B

Plastic-body (Kynar®), open junction, conic, Viscolene, non-refillable,
combination pH electrode. Use: meat & cheese.

FC210B

Glass-body, double junction, conic, Viscolene, non-refillable, combination
pH electrode.

Use: milk, yogurt.

FC220B

Glass-body, triple-ceramic, single junction, refillable, combination pH
electrode. Use: food processing.

FC911B

Plastic-body (Kynar®), double junction, refillable with built-in amplifier,
combination pH electrode. Use: very high humidity.

24

SPECIFICATIONS

5

OPERATIONAL GUIDE

120 mm

4.7"

5mm

0.2"

5mm DIA

0.2"

"S" VERSION

HI 1330

120 mm

4.7"

12 mm

0.5"

HI 1230

75 mm

2.95"

6 mm

0.25"

HI 2031

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1332

210 mm

8.25"

8 mm

0.3"

7.5mm DIA

0.29"

"S" VERSION

HI 1331

INITIAL PREPARATION

The meter is supplied complete with batteries. Remove the back cover,
unwrap the batteries and install them while paying attention to their
polarity (see page 15).

To prepare the instrument for use, connect the pH electrode and the
temperature probe to the BNC and temperature sockets on the top of
the instrument. The temperature probe is used in conjunction with
the pH electrode to utilize the meter's ATC capability, but it can also
be used independently to take temperature measurements. If the
probe is disconnected, temperature can be set manually with the UP
and DOWN arrow keys (see page 7 for details).

Turn the instrument ON by pressing ON/OFF.
At start-up the display will show all the used segments for a few seconds

(or while the button is held), followed by the percentage indication of the
remaining battery charge, then enters measurement mode.

HI1330B

Glass-body, semimicro, single junction, refillable, combination pH electrode.
Use: laboratory, vials.

HI1331B

Glass-body, semimicro, single junction, refillable, combination pH electrode.
Use: flasks.

HI1230B

Plastic-body (Ultem®), double junction, gel-filled, combination pH
electrode.

Use: general, field.

After measurement switch the meter off, clean the electrode and store it
with a few drops of HI 70300 storage solution in the protection cap.

The auto-off feature turns the meter off after 20 minutes with no
button pressed to save battery life. To disable this feature, see Setup
Menu section on page 9.

pH MEASUREMENTS

To take a pH measurement remove the elec­trode protective cap and simply submerge
the tip (4cm/1½") of the electrode and the
temperature probe into the sample to be tested.

If necessary, press the RANGE key until the
display changes to the pH mode.

Allow for the electrode to adjust and reading
to stabilize (hourglass symbol turns off).

The LCD will show the pH measurement
together with the temperature of the sample.

6

HI2031B

Glass-body, semimicro, conic, refillable, combination pH electrode.
Use: semisolid products.

HI1332B

Plastic-body (Ultem®), double junction, refillable, combination pH
electrode.

Use: general purpose.

23

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

"S" VERSION

HI 1043

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1053

120 mm

12 mm

0.5"

5 mm

0.2"

3 mm

0.12"

3.0 mm DIA

0.12"

HI 1083

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

"S" VERSION

HI 1131

ORP SOLUTIONS

HI7020L Test Solution 200-275 mV, 500 mL bottle
HI7020M Test Solution 200-275 mV, 230 mL bottle
HI7021L Test Solution 240 mV, 500 mL bottle
HI7021M Test Solution 240 mV, 230 mL bottle

pH ELECTRODES

All electrodes part numbers ending in B are supplied with a BNC
connector and 1 m (3.3') cable, as shown below:

HI1043B

Glass-body, double junction, refillable, combination pH electrode.
Use: strong acid/alkali.

HI1053B

Glass-body, triple ceramic, conic shape, refillable, combination pH electrode.
Use: emulsions.

In order to take more accurate pH measurements, make sure that the
instrument is calibrated (see page 9 for details).

It is recommended that the electrode is always kept wet and rinsed
thoroughly with the sample to be measured before use.
The pH reading is directly affected by temperature. In order for the
meter to measure the pH accurately, temperature must be taken into
consideration. If the sample temperature is different from the tempera­ture at which the pH electrode was kept, allow a few minutes to reach
thermal equilibrium.
To use the meter's Automatic Temperature Compensation feature,
submerge the temperature probe into the sample as close to the
electrode as possible and wait for a few minutes.

If manual temperature compensation (MTC) is desired, the
temperature probe must be disconnected from the instrument.

The display will show the default temperature
of 25 °C or the last temperature set with the
"°C" (or "°F") indicator blinking.

The MTC tag and up & down arrows symbols light up on the LCD to
indicate that the meter is in MTC mode and the arrow keys can be
used to enter the desired temperature value.

Note: When in MTC the user can press and hold the arrow keys, and

the meter will start incrementing/decrementing the temperature
value. The meter keeps measuring and the display is updated
every second.

HI1083B

Glass-body, micro, Viscolene, non-refillable, combination pH electrode.
Use: biotechnology, micro titration.

HI1131B

Glass-body, single junction, refillable, combination pH electrode.
Use: general purpose.

22

ORP MEASUREMENTS

To perform ORP measurements, connect an optional ORP electrode
(see "Accessories" section) to the meter and turn it ON.
If necessary, enter the "mV" mode by pressing RANGE until the
display changes to mV.
Submerge the ORP electrode tip (4cm/1½") into the sample to be
tested and wait a few minutes for the reading to stabilize.
Measurements within the ±699.9 mV range are displayed with 0.1
mV resolution, while outside this range the resolution automatically
switches to 1 mV.

The ATC (or MTC) tag is turned off because mV readings are not
temperature compensated.

7

For accurate ORP measurements, the surface of the electrode must be
clean and smooth. Pretreatment solutions are available to condition
the electrode and improve its response time (see "Accessories" section).

Notes:

 When the reading is out of range, the display will flash the closest

full-scale value.

 If using pH electrode while in mV mode, the meter will measure

the mV generated by the pH electrode.

MEM & MR FUNCTIONS

From normal measurement mode, pressing the MEM key will freeze
the readings on the display and store into internal memory the
current values (pH and temperature, or mV and temperature)
together with condition and buffer segments.

The MEM tag blinks and the display remains frozen until the MEM
key is pressed again.

Note: While in MEM mode, the user can switch between pH and mV

by pressing the RANGE key.

A stored value can be recalled by pressing MR: the display will show
the value, together with the RCL & MEM tags, as long as the MR key
is pressed.

Note: Pressing MR, only the range that was active at the time MEM

was pressed is shown.

BACKLIGHT FEATURE

The meter is provided with a Backlight feature,
which can be easily toggled on and off through
the keyboard by pressing the LIGHT key.

Note: The backlight automatically shuts off after approximately 1 minute

with no buttons pressed.

ACCESSORIES

pH CALIBRATION SOLUTIONS

HI70004P pH 4.01 Buffer Solution, 20 mL sachet, 25 pcs
HI70006P pH 6.86 Buffer Solution, 20 mL sachet, 25 pcs
HI70007P pH 7.01 Buffer Solution, 20 mL sachet, 25 pcs
HI70009P pH 9.18 Buffer Solution, 20 mL sachet, 25 pcs
HI70010P pH 10.01 Buffer Solution, 20 mL sachet, 25 pcs
HI 7001L pH 1.68 Buffer Solution, 500 mL bottle
HI 7001M pH 1.68 Buffer Solution, 230 mL bottle
HI7004L pH 4.01 Buffer Solution, 500 mL bottle
HI7004M pH 4.01 Buffer Solution, 230 mL bottle
HI7006L pH 6.86 Buffer Solution, 500 mL bottle
HI7006M pH 6.86 Buffer Solution, 230 mL bottle
HI7007M pH 7.01 Buffer Solution, 500 mL bottle
HI7007M pH 7.01 Buffer Solution, 230 mL bottle
HI7009L pH 9.18 Buffer Solution, 500 mL bottle
HI7009M pH 9.18 Buffer Solution, 230 mL bottle
HI7010L pH 10.01 Buffer Solution, 500 mL bottle
HI7010M pH 10.01 Buffer Solution, 230 mL bottle

ELECTRODE STORAGE SOLUTION

HI70300L Storage Solution, 460 mL bottle
HI70300M Storage Solution, 230 mL bottle

ELECTRODE CLEANING SOLUTIONS

HI70000P Electrode Rinse Solution, 20 mL sachet, 25 pcs
HI7061L General Cleaning Solution, 460 mL bottle
HI7061M General Cleaning Solution, 230 mL bottle
HI7073L Protein Cleaning Solution, 460 mL bottle
HI7073M Protein Cleaning Solution, 230 mL bottle
HI7074L Inorganic Cleaning Solution, 460 mL bottle
HI7074M Inorganic Cleaning Solution, 230 mL bottle
HI7077L Oil & Fat Cleaning Solution, 460 mL bottle
HI7077M Oil & Fat Cleaning Solution, 230 mL bottle

REFILLING ELECTROLYTE SOLUTIONS (50 mL, 4 pcs)

HI7071 3.5M KCl+AgCl Electrolyte for single junction electrodes
HI7072 1M KNO3 Electrolyte
HI7082 3.5M KCl Electrolyte for double junction electrodes
HI8093 1M KCl+AgCl Electrolyte

ORP PRETREATMENT SOLUTIONS

HI7091L Reducing Pretreatment Solution, 460 mL bottle
HI7091M Reducing Pretreatment Solution, 230 mL bottle
HI7092L Oxidizing Pretreatment Solution, 460 mL bottle
HI7092M Oxidizing Pretreatment Solution, 230 mL bottle

8

21

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TROUBLESHOOTING GUIDE

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pH CALIBRATION

It is recommended to calibrate the instrument frequently, especially if
high accuracy is required.

The pH range should be recalibrated:
a) Whenever the pH electrode is replaced.
b) At least once a week.
c) After testing aggressive chemicals.
d) When extreme accuracy is required.
e) When the calibration time-out is expired (if feature is enabled).

PROCEDURE

The meter offers a choice of 7 memorized buffers (1.68, 4.01, 6.86,

7.01, 9.18, 10.01 and 12.45 pH) and also allows the user to enter
two more pH values for calibration, C1 and C2 (see Custom Buffer
Selection section on page 12 for details).

 Pour small quantities of selected buffer solutions into clean beakers.

20

For accurate calibration use two beakers for each buffer solution, the
first one for rinsing the electrode and the second one for calibration.

 Remove the protective cap and rinse the electrode with some of

the buffer solution to be used for the first calibration point.

TWO-POINT CALIBRATION

 Press the CAL key. The "CAL" and " " indicators will be

displayed. The secondary LCD will display buffer "7.01". If a
different calibration buffer is desired (e.g. 6.86), use the UP
and DOWN arrow keys to change the displayed value.

 Submerge the electrode approximately 4 cm (1½") into the

solution, place the temperature probe as close as possible to the
electrode and stir gently.

 The LCD will flash "NOT READY" for 12

seconds, then:
if the reading is not close to the selected
buffer, "WRONG " and "WRONG "
will blink alternatively;
if it is close to the selected buffer the
meter will advise the user with an
acoustic signal (if enabled) when the
reading becomes stable and the display
will change to "READY" and blinking "CFM".

9

 Press the CFM key to confirm the calibra-

tion: the meter stores the first calibration
point; the primary LCD will show the
calibrated reading, while the secondary
LCD will show the second buffer to be
used for calibration (pH 4.01).

If youre going to calibrate with a
different buffer, select the desired value
by pressing the arrow keys.

 Submerge the electrode approximately 4 cm (1½") into the

second buffer solution, place the temperature probe as close as
possible to the electrode and stir gently.

 The LCD will flash "NOT READY" for 12 seconds, then:

if the reading is not close to the selected buffer, "WRONG "
and "WRONG " will blink alternatively;
if it is close to the selected buffer the meter
will advise the user with an acoustic
signal (if enabled) when the reading
becomes stable and the display will change
to "READY" and blinking "CFM".

 Press the CFM key: the value is stored in memory and the meter

returns to normal mode. The tags corresponding to the buffers
used for calibration will light up together with the condition
bargraph (if enabled).

For refillable electrodes, if the refill solution (electrolyte) is more than 2½
cm (1") below the fill hole, add the appropriate Electrolyte Solution.

MEASUREMENT

Rinse the electrode tip with distilled water, immerse it (4 cm / 1½")
in the sample and stir gently for a few seconds.
For a faster response and to avoid cross contamination of the samples,
rinse the electrode tip with the solution to be tested, before taking
any measurements.

STORAGE PROCEDURE

To minimize clogging and ensure a quick response time, the glass
bulb and the junction should always be kept moist.
When not in use, store it with a few drops of HI 70300 storage
solution in the protective cap.

NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED
WATER.

PERIODIC MAINTENANCE

Inspect electrode and cable. The cable used for the connection to the
meter must be intact and there must be no points of broken
insulation on the cable or cracks on the electrode stem or bulb. If any
scratches or cracks are present, replace the electrode. Rinse off any salt
deposits with water.
Connectors must be perfectly clean and dry.

For refillable electrodes:

Note: The meter automatically skips the buffer used for the first calibration

point to avoid erroneous procedure. A difference of at least 1.5 pH
unit is required between the two buffers used for the offset and slope
calibration: once calibrated at either pH 7.01 or 6.86, the
instrument automatically ignores the other value for the second point
(same for pH 10.01 and 9.18).

Note: During calibration, the secondary LCD shows the selected buffer

value; press RANGE to display the buffer temperature.

Note: To clear a previous calibration and return to the default

values, press CLR at any time after entering the calibration
mode. The LCD will show CLr CAL for one second, and then
will return to normal measurement mode.
The LCD will show an empty bargraph to warn the user that
the meter is not calibrated.

10

Refill the electrode with fresh electrolyte (see the electrodes specifications
to select the correct refilling solution). Allow the electrode to stand
upright for 1 hour. Follow the Storage Procedure above.

CLEANING PROCEDURE

 General Soak in Hanna HI 7061 General Cleaning

Solution for approximately ½ hour.

 Protein Soak in Hanna HI 7073 Protein Cleaning

Solution for 15 min.

 Inorganic Soak in Hanna HI 7074 Inorganic

CleaningSolution for 15 min.

 Oil/grease Rinse with Hanna HI 7077 Oil & Fat Cleaning

Solution for 1 min.

IMPORTANT: After performing any of the cleaning procedures, rinse
the electrode thoroughly with distilled water and soak it in HI 70300
Storage Solution for at least 1 hour before taking measurements.

19

ELECTRODE CONDITIONING & MAINTENANCE

Not present in gel electrodes.

PREPARATION PROCEDURE

Remove the electrode protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is
normal with electrodes and they will disappear when rinsed with water.
During transport tiny bubbles of air may have formed inside the glass
bulb. The electrode cannot function properly under these conditions.
These bubbles can be removed by "shaking down" the electrode as you
would do with a glass thermometer.
If the bulb and/or junction are dry, soak the electrode in HI 70300
Storage Solution for at least one hour.

ONE-POINT CALIBRATION

For optimum accuracy it is always recommended to perform a two­point calibration, but for a faster operation it is also possible to carry
out a single-point procedure.
Buffers at pH 7.01 or pH 6.86 (NIST) are normally the most
appropriate for this purpose, even though the meter can be calibrated
with any of the memorized calibration values.
After calibrating the first point (see above), press the CAL key to end
the calibration procedure.

Note: With one-point calibration there is no Condition and only the

frame is shown. Calibration time-out is active.

CUSTOM BUFFER SELECTION

 The meter also allows the user to calibrate with custom buffers.
 To select a custom buffer press the CUSTOM BUF key while in calibration

mode. Use the arrow keys to set the desired value for C1 (the default

value is 7.00).

Note: To increase the speed, keep pressed the UP or DOWN key.
 Once the desired value is reached, the meter will continue

calibration as with memorized buffers.
 Pressing again CUSTOM BUF, the meter

will select the second custom buffer. Pressing

CUSTOM BUF once again, the meter will

return to the standard buffers mode.

EXPIRED CALIBRATION

The instrument is provided with a real time clock (RTC), in order to
monitor the time elapsed since the last pH calibration.
The real time clock is reset every time the meter is calibrated and the
expired calibration status is triggered when the meter detects a
calibration time-out. The CAL tag will start blinking to warn the user
that the meter should be recalibrated.
The calibration time-out can be set (see Setup menu section on
page 14) from 0 (function disabled) to 14 days.
For example, if a 4 days time-out has been selected the meter will
issue the alarm exactly 4 days after the last calibration.
However, if at any moment the expiration value is changed (e.g. to
7 days), then the alarm will be immediately recalculated and appear
7 days after the last calibration.

18

11

Notes:

 When the meter is not calibrated or calibration is cleared (default

values loaded) there is no expired calibration, and the display
always shows a blinking CAL tag.

 When an abnormal condition in the RTC is detected the meter

forces the expired calibration status.

CONDITION

The display is provided with a 5-dot bargraph (unless the feature is
disabled) which gives an indication of the electrode status after
calibration as follows:

Bargraph indication Condition value

All 5 dots steady 81 to 100% of life

4 dots steady 61 to 80%

TEMPERATURE CORRELATION

FOR pH SENSITIVE GLASS

The resistance of glass electrodes partially depends on the temperature.
The lower the temperature, the higher the resistance. It takes more time
for the reading to stabilize if the resistance is higher. In addition, the
response time will suffer to a greater degree at temperatures below 25 °C.

3 dots steady 41 to 60%

2 dots steady 21 to 40%

1 dot steady 1 to 20%

1 dot blinking 0%

Only frame is ON No info available

The condition bargraph remains active for 12 hours after calibration,
then only the frame is shown.

Note: When an abnormal condition in the RTC is detected, the condition

is cleared and only the bargraph frame is shown on the display.

CLEAN ELECTRODE

Each time pH calibration is performed, the meter internally compares
the new calibration with the one previously stored.

When this comparison indicates a significant
difference, the CLEAN message blinks on the
LCD to advise the user that the pH electrode
may need to be cleaned (see Electrode
Conditioning & Maintenance section).

After cleaning, perform calibration.
Note: If the calibration data are cleared, the comparison is done

with the default values.

12

Since the resistance of the pH electrode is in the range of 50  200
Mohms, the current across the membrane is in the pico Ampere range.
Large currents can disturb the calibration of the electrode for many
hours.

For these reasons high humidity environments, short circuits and static
discharges can be detrimental to a stable pH reading.

The pH electrodes life also depends on the temperature. If constantly
used at high temperatures, the electrode life is drastically reduced.

Typical Electrode Life

Ambient Temperature 1  3 years
90 °C Less than 4 months
120 °C Less than 1 month

Alkaline Error

High concentrations of sodium ions interfere with readings in alkaline
solutions. The pH at which the interference starts to be significant
depends upon the composition of the glass. This interference is called
alkaline error and causes the pH to be underestimated. Hannas glass
formulations have the indicated characteristics.

Sodium Ion Correction for Glass at 20-25 °C
Concentration pH Error

0.1 Mol L-1 Na

1.0 Mol L-1 Na

+

+

13.00

13.50

14.00

12.50

13.00

13.50

14.00

0.10

0.14

0.20

0.10

0.18

0.29

0.40

17

PMET SREFFUBHp

Cº Fº 86.1 10.4 68.6 10.7 81.9 10.01 54.21

0 23 76.1 10.4 89.6 31.7 64.9 23.01 83.31

5 14 76.1 00.4 59.6 01.7 93.9 42.01 81.31

01 05 76.1 00.4 29.6 70.7 33.9 81.01 99.21

51 95 76.1 00.4 09.6 50.7 72.9 21.01 08.21

02 86 86.1 00.4 88.6 30.7 22.9 60.01 26.21

52 77 86.1 10.4 68.6 10.7 81.9 10.01 54.21

03 68 86.1 20.4 58.6 00.7 41.9 69.9 92.21

53 59 96.1 30.4 48.6 99.6 11.9 29.9 31.21

04 401 96.1 40.4 48.6 89.6 70.9 88.9 89.11

54 311 07.1 50.4 38.6 89.6 40.9 58.9 38.11

05 221 17.1 60.4 38.6 89.6 10.9 28.9 07.11

55 131 27.1 80.4 48.6 89.6 99.8 97.9 75.11

06 041 27.1 90.4 48.6 89.6 79.8 77.9 44.11

56 941 37.1 11.4 48.6 99.6 59.8 67.9 23.11

07 851 47.1 21.4 58.6 99.6 39.8 57.9 12.11

57 761 67.1 41.4 68.6 00.7 19.8 47.9 01.11

08 671 77.1 61.4 78.6 10.7 98.8 47.9 00.11

58 581 87.1 71.4 78.6 20.7 78.8 47.9 19.01

09 491 97.1 91.4 88.6 30.7 58.8 57.9 28.01

59 302 18.1 02.4 98.6 40.7 38.8 67.9 37.01

LCD MESSAGE GUIDE

temperature
compensation
mode

pH or mV
measurement

calibration buffers
custom buffers active

temperature reading
or pH buffer value

mode tags

instability
indicator

battery
symbol

calibration

messages

condition
bargraph

arrow keys

active

first or second
calibration point

calibration

messages

TAGS & SYMBOLS

 Mode tags light up for indicating the corresponding active mode,

and blink for warning the user.

SETUP on: setup menu mode has been entered.
CFM blinking: ask confirmation of calibration value.
CAL on: calibration mode has been entered.
CAL blinking: meter is not calibrated or calibration is expired.
RCL, MEM on: when recalling stored values.
MEM blinking: measurement stored in the internal memory and

frozen on the display.

 Indication of temperature compensation mode:

MTC for manual, ATC for automatic compensation.

 Battery symbol blinking: low battery condition. Batteries should

be replaced soon.

 Calibration messages.

NOT READY blinking: buffer has been recognized, but reading

is not stable.

READY on: buffer has been recognized and reading is stable.
WRONG and WRONG blinking alternatively: wrong

buffer, value not recognized.

CLEAN blinking: an abnormal difference between new and

previous calibration has been detected. Electrode cleaning is
suggested. Follow the cleaning procedure described in the
Electrode conditioning & maintenance section. If the problem
remains, check the buffer solutions.

pH BUFFER TEMPERATURE

DEPENDENCE

The temperature has an effect on pH. The calibration buffer solutions
are affected by temperature changes to a lesser degree than normal
solutions. During calibration the instrument will automatically calibrate
to the pH value corresponding to the measured or set temperature.

16

During calibration the instrument will display the pH buffer value at
25 °C.

13

SETUP MENU

mV CALIBRATION

The instrument allows the user to configure several parameters
through the Setup Menu.

To enter the Menu mode, while in normal measurement mode, press
and hold the SETUP key for about 5 seconds.

Once the menu is entered, each parameter can be changed by using
the arrow keys; then pressing the CFM key will confirm the value and
scroll to the next parameter.

The sequence of programmable parameters is as follows:

1. Acoustic signal: On (default) or Off

2. Auto-off feature: 20 minutes (default) or disabled

3. Temperature measure unit: ºC (default) or ºF

4. Calibration segments: On (default) or Off (this enables or disables
the bargraph, the CLEAN message and the buffer segments)

5. Calibration time-out: 1 (default) to 14 days or disabled (0 days)

After setting the last parameter, pressing the CFM key will confirm the
value and return to normal measurement mode.

HI9026 has been accurately precalibrated for mV range at the
factory.

For optimum accuracy, it is recommended to recalibrate the meter for
mV readings at least once a year.

Contact your Dealer or the nearest Hanna Customer Service Center for
more information.

TEMPERATURE CALIBRATION

HI9026 has been accurately precalibrated for temperature at the
factory.

For optimum accuracy, it is recommended to recalibrate the meter for
temperature at least once a year.

Contact your Dealer or the nearest Hanna Customer Service Center for
more information.

BATTERY REPLACEMENT

If the batteries become weak, the display
will flash the battery symbol to advise the
user that approximately 25 hours of work­ing time is left. It is recommended to
replace batteries soon.

The meter is also provided with the BEPS
(Battery Error Prevention System) feature, which
automatically turns the instrument off when
the battery level is too low to ensure reliable
readings. At start-up the display will show
0 bAtt for a few seconds, then the meter
automatically turns off.

Battery replacement must only take place in a non hazardous area
using the battery types specified in this instruction manual.

To replace rundown batteries, remove the
rear cover of the instrument and substitute
all four 1.5V AA alkaline batteries with new
ones, while paying attention to the correct
polarity. Reattach the cover and tighten
the two screws.

14

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