Hanna instruments HI 8424NEW User Manual

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Instruction Manual

HI 8424NEW

Portable pH/mV/°C Meter

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with Automatic Calibration and

Battery Recharging System

MAN8424W R1 10/05

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

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www.hannainst.com

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]

[e-mail] or see the back cover for our worldwide contact list.

[e-mail]@hannainst.com
This instrument is in compliance with the directives.

WARRANTYWARRANTY

WARRANTY

WARRANTYWARRANTY

HI 8424NEW 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 instru­ment. 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.

TABLE OF CONTENTSTABLE OF CONTENTS

TABLE OF CONTENTS

TABLE OF CONTENTSTABLE OF CONTENTS

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

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

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

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

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

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

pH BUFFER TEMPERATURE DEPENDENCE .....................................................11

MENU SELECTION .....................................................................................12

mV CALIBRATION .....................................................................................13

TEMPERATURE CALIBRATION ..................................................................... 13

BATTERY RECHARGE AND REPLACEMENT ...................................................... 14

LCD MESSAGES AND TROUBLESHOOTING ................................................... 15

ELECTRODE CONDITIONING & MAINTENANCE .............................................. 16

ACCESSORIES ...........................................................................................19

pH ELECTRODE APPLICATION REFERENCE GUIDE .......................................... 25

CE DECLARATION OF CONFORMITY ............................................................. 19

2

All rights are reserved. Reproduction in whole or in part is prohibited without the written consent
of the copyright owner.

Hanna Instruments reserves the right to modify the design, construction and

appearance of its products without advance notice.

27

CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY

CE DECLARATION OF CONFORMITY

CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY

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.

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

PRELIMINARY EXAMINATION

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it carefully to
make sure that no damage has occurred during shipment. If there is any
damage, immediately notify your dealer.

The meter is supplied complete with:

• HI 1230B pH electrode

• HI 7662 temperature probe

• pH 4.01 & pH 7.01 buffer solutions, 20 mL each

• HI 700661 cleaning solution, 20 mL sachet (2 pcs)

• 9V Ni-MH rechargeable battery

• Instruction manual

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

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

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTIONGENERAL DESCRIPTION

HI 8424NEW is a portable microprocessor-based pH/mV/temperature meter.
It features an enhanced user interface, rainproof casing, battery percentage

indication, low battery detection, automatic shut-off, automatic calibration and
error codes to guide the user in calibration and troubleshooting.

The instrument is also equipped with an inductive system for battery recharge, with
no external contact, to ensure a watertight seal. Simply place the HI 8424NEW on
the HI 710040 battery charger (optional), without needing to open the meter or
remove the battery.

The pH calibration procedure automatically recognizes three memorized buffer
values: pH 4.01, 7.01 and 10.01.

This instrument can also measure ORP. The resolution automatically switches
from 0.1 mV to 1 mV when readings exceed ±699.9 mV.

The user can set the following parameters by entering a setup mode through
the keyboard:

• enabling or disabling the auto-off feature

• enabling or disabling the acoustic signal

• selecting the temperature unit, °C or °F

26

3

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

1) BNC connector for pH or ORP electrodes

2) Liquid Crystal Display (LCD)

3) RANGE key, to select pH, mV or temperature range

4) Up Arrow key, to manually set the temperature value when no tempera-

ture probe is connected

5) CAL/SELECT key, to enter calibration mode or select menu options

6) CFM/SETUP key, to confirm data or enter/exit setup menu

7) Down Arrow key, to manually set the temperature value when no

temperature probe is connected

8) HOLD key, to freeze the reading on display

9) ON/OFF key, to switch the instrument ON or OFF

10) RCA socket for temperature probe

pp

H ELECTRODE APPLICATIONH ELECTRODE APPLICATION

p

H ELECTRODE APPLICATION

pp

H ELECTRODE APPLICATIONH ELECTRODE APPLICATION

REFERENCE GUIDEREFERENCE GUIDE

REFERENCE GUIDE

REFERENCE GUIDEREFERENCE GUIDE

Application Electrodes *

1. Aquarium HI 1332B, HI1312S

2. Bath-water HI 1130B, HI1110S

3. Beer HI 1131B, HI 1111S

4. Bread HI 2031B, FC 200B, HI 2020S, FC 200S

5. Cheese FC 200B, FC200S

6. Dairy products FC 911B, FC 100B

7. Dirty water HI 1230B, HI1210S

8. Emulsions HI 1053B, HI1050S

9. Environment HI 1230B, HI1210S

10. Flasks HI 1331B, HI1310S

11. Food industry general use FC 911B, FC 100B

12. Fruit FC 200B, FC 220B, FC 200S

13. Fruit juices, organic FC 210B

14. Galvanizing waste solution HI 1130B, HI1110S

15. High purity water HI 1053B, HI1050S

16. Horticulture HI 1053B, FC200B, HI1050S, FC 200S

17. Laboratory general use HI 1131B, HI 1230B, HI 1332B, HI1330B

18. Leather HI 1413B, HI1410S

19. Lemon juice FC100B

20. Meat FC 200B, HI2031B, FC 200S, HI2020S

21. Micro plate sampling of less than HI 1083B
100 mL

22. Milk and Yogurt FC 210B

23. Paints HI 1053B, HI1050S

24. Paper HI 1413B, HI 1410S

25. Photographic chemicals HI1230B, HI 1210S

26. Quality control HI 1332B, HI1312S

27. Sausages FC 200B, HI2031B, FC 200S, HI2020S

28. Semi-solid products HI 2031B, HI 2020S

29. Skin HI 1413B, HI 1410S

30. Soil samples HI 1230B, HI1210S

31. Solvents HI1043B, HI1040S

32. Strong acid HI 1043B, HI1040S

33. Submersion application HI 1130B, HI1110S

34. Surface measurements HI 1413B, HI1410S

35. Swimming pool H I1130B, HI 2114P/2

36. Titrations with constant HI 1131B, HI 1111S
temperature range

37. Titrations with wide temperature HI 1131B, HI 1111S
range

38. Very high humidity FC 911B

39. Vials and test tube HI1330B, HI1310S

40. Wine processing FC 220B

HI 1111S, HI1210S, HI1312S, HI1310S

B = BNC-type connector S = Screw-type connector
* All electrodes ending with "B" are supplied with 1 m (3.3') cable and BNC Connector

4

25

HI 4430B / HI 4410S

Plastic body, gel-filled, combination gold ORP electrode.
Use: general purpose.

12 mm

0.5"

HI 4430

120 mm

"S" VERSION

4.7"

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

EXTENSION CABLES FOR SCREW-TYPE ELECTRODES (SCREW
TO BNC CONNECTOR)

HI 7855 SERIES CABLE CONNECTORS

CONNECTOR AND 3.0 mm (0.12") CABLE WITH BNC

CONNECT TO
SCREW TYPE
ELECTRODES

CONNECT TO THE

BNC SOCKET

OF THE METER

HI 7855/1 Extension cable 1 m (3.3') long
HI 7855/3 Extension cable 3 m (9.9') long
HI 7855/5 Extension cable 5 m (16.5') long
HI 7855/10 Extension cable 10 m (33') long
HI 7855/15 Extension cable 15 m (49.5') long

OTHER ACCESSORIES

HI 98501
HI 98502

ChecktempC
ChecktempF

pocket-size thermometer (–50.0 to 150.0°C)
pocket-size thermometer (–58.0 to 302.0°F)

HI 710015 Shockproof rubber boot, blue
HI 710016 Shockproof rubber boot, orange
HI 710022 Spare protective case
HI 710040 No-contact, inductive battery charger
HI 76405 Electrode holder
HI 7662 Temperature probe with 1 m (3.3') screened cable
HI 8427 pH/ORP electrode simulator with 1 m (3.3') coaxial cable and

BNC connector

HI 931001 pH/ORP electrode simulator with LCD, 1 m (3.3') coaxial cable

and BNC connector

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONSSPECIFICATIONS

Range -2.00 to 16.00 pH

±699.9 mV / ±1999 mV

-20.0 to 120.0°C / -4.0 to 248.0°F

Resolution 0.01 pH / 0.1 mV / 1 mV / 0.1°C / 0.1°F
Accuracy (@20°C/68°F)

±0.01 pH / ±0.2 mV / ±1 mV / ±0.4°C / ±0.8°F

Typical EMC Deviation

±0.02 pH / ±0.2 mV / ±1 mV / ±0.4°C / ±0.8°F

pH Calibration Automatic, 1 or 2 point,

with 3 memorized buffer values (pH 4.01, 7.01, 10.01)

Offset: ±1 pH; Slope: from 75 to 110%

Temperature Compensation

Automatic, -20 to 120°C (-4 to 248°F)

or manual without temperature probe

Probes (included)

HI 1230B double junction, gel-filled pH electrode

HI 7662 temperature probe
Battery Type 1 x 9V, Ni-MH rechargeable
Battery Charge Life Approx. 150 hours of continuous use
Battery Life Approx. 5 years
Auto-off After 20 minutes of nin-use or disabled (user-selectable)
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 164 x 76 x 45 mm (6.5 x 3.0 x 1.8'')
Weight 180 g (6.3 oz.)

24

5

OPERATIONAL GUIDEOPERATIONAL GUIDE

OPERATIONAL GUIDE

OPERATIONAL GUIDEOPERATIONAL GUIDE

INITIAL PREPARATION

• Remove the electrode protective cap before taking any measurements. If the

electrode has been left dry, soak the tip in HI 70300 storage solution for a few
hours or overnight to reactivate it.

• Connect the pH electrode to the BNC connector on the top of the instrument.

• Connect the temperature probe to the RCA connector. The temperature probe

can be used independently to take temperature measurements, or in
conjunction with the pH electrode to utilize the ATC capability of the meter.

• Turn the meter ON by pressing the ON/OFF key. The display shows all the
used segments for a few seconds (or as long as the button is held), followed
by the percentage indication of the remaining battery life, and then enters
normal measurement mode.

pH MEASUREMENTS

• To take a pH measurement simply submerge the
electrode tip (at least 4 cm/1½") and the tem­perature probe into the sample to be tested.

• Select the pH mode by pressing the RANGE key until
the display changes to pH.

• Stir gently and wait for the stability symbol (hourglass) to turn off. The display will
show the pH value automatically compensated for temperature.

Notes:

• In order to take accurate pH measurements, make sure that the instrument
has been calibrated before use (see page 9).

• If measurements are taken in different samples successively, it is recom­mended to rinse the electrode thoroughly to avoid cross-contamination. After
cleaning, it is recommended to rinse the electrode with some of the sample to
be measured.

FC 220B

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

12 mm

0.5"

FC 220

9.5mm DIA

120 mm

4.7"

0.37"

FC 911B

PVDF body, double junction, refillable with built-in amplifier, combination pH
electrode. Use: very high humidity.

12 mm

0.5"

FC 911

110 mm

4.3"

HI 1413B

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

12 mm

0.5"

HI 1413

110 mm

4.3"

ORP ELECTRODES

HI 3131B / HI 3111S

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

12 mm

0.5"

HI 3131

150 mm

"S" VERSION

5.9"

HI 3230B / HI 3210S

Plastic body, gel-filled, combination platinum ORP electrode.
Use: general purpose.

12 mm

0.5"

HI 3230

120 mm

"S" VERSION

6

4.7"

23

HI 1332B / HI 1312S

Plastic body, double junction, refillable, combination pH electrode.
Use: general purpose.

12 mm

0.5"

HI 1332

"S" VERSION

120 mm

4.7"

HI 2031B / HI 2020S

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

6 mm

0.25"

HI 2031

75 mm

"

"

2.95"

FC 100B

PVDF body, double junction, refillable, combination pH electrode.
Use: general purpose for food industry.

12 mm

0.5"

FC 100

120 mm

4.7"

FC 200B / FC 200S
PVDF body, single junction, conic, Viscolene, non-refillable, combination pH
electrode. Use: meat & cheese.

6 mm

0.25"

FC 200

75 mm

2.95"

FC 210B

Glass body, double junction, conic, Viscolene, non-refillable combination pH
electrode. Use: milk, yogurt.

12 mm

0.5"

FC 210

120 mm

4.7"

TEMPERATURE COMPENSATION

The meter is designed to compensate for temperature, as the response of the pH
electrode is directly affected by temperature.

Automatic Temperature Compensation (ATC shown on LCD)

To use the ATC feature, submerge the temperature probe into the sample as
close as possible to the electrode and wait for a few minutes. The displayed pH
reading is compensated for the temperature of the sample.

Manual Temperature Compensation (MTC shown on LCD)

If the temperature probe is not connected, it is possible to enter the tempera­ture value manually.

• Record the sample temperature by using a ChecktempC (if you are
measuring temperature in °C, or ChecktempF for °F readings) or another
accurate thermometer.

• Press RANGE to select the temperature mode. The "°C" (or "°F") symbol will
blink to indicate that the temperature probe is not connected.

• Use the UP and DOWN keys to display and set
the sample temperature (e.g. 25 °C).

• Press RANGE to select the pH measurement mode and immerse the electrode
into the sample. The displayed pH reading will be temperature compensated
at the set value (in this case at 25 °C).

ORP MEASUREMENTS

Oxidation Reduction Potential (ORP) measurements provide a quantification of
the oxidizing or reducing power of the sample tested.

• Connect the ORP electrode (optional) to the BNC connector.

• To enter the "mV" mode turn the instrument ON and press the RANGE key
until the display changes to mV.

• Submerge the ORP electrode tip (at least 4 cm / 1½") into the sample to be
tested and allow time for the reading to stabilize (hourglass symbol turns off).

• Measurements within the ±699.9 mV range
are displayed with 0.1 mV resolution, while
outside this range the resolution is 1 mV.

22

7

Notes:

• To perform correct ORP measurements, the surface of the ORP electrode must
be clean and smooth.

• When not in use, the tip of the electrode should be kept moist (use HI 70300
storage solution) and safe from any mechanical stress which might cause
damage to the glass/platinum junction.

TEMPERATURE MEASUREMENTS

• Turn the instrument ON and press the RANGE key to select the temperature
mode.

• Make sure the temperature probe is connected to the meter.

• Dip the temperature probe into the sample, allow the reading to stabilize
(hourglass symbol turns off) and read the temperature value.

• Temperature measurements can be displayed in °C or °F units (see "Menu
selection" for details).

Notes:

• A blinking full scale value means that the reading is out of range.

• To freeze a reading on display while in mea­surement mode, press the HOLD key. The "HOLD"
tag will blink. The pH, mV and temperature
values are held, and the RANGE key can be
used to view the values. Press HOLD again to
return to normal mode.

• If enabled, keypresses are followed with an acoustic signal. A lower note
indicates that the key is not currently active.

• To save battery life, the meter is provided with an auto-off feature, which
turns the instrument off after 20 minutes of non-use. This feature can be
disabled by the user (see "Menu selection" for details).

HI 1083B

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

HI 1083

12 mm

0.5"

5 mm

0.2"

120 mm

3 mm

0.12"

"

3.0 mm DIA

0.12"

HI 1131B / HI 1111S

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

12 mm

0.5"

HI 1131

"S" VERSION

9.5mm DIA

120 mm

4.7"

0.37"

HI 1230B / HI 1210S

Plastic body, double junction, gel-filled, combination pH electrode.
Use: general purpose.

12 mm

0.5"

HI 1230

120 mm

"

"

4.7"

HI 1330B / HI 1310S

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

HI 1330

"S" VERSION

120 mm

4.7"

5mm DIA

0.2"

5mm

0.2"

HI 1331B / HI 1311S

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

8 mm

0.3"

7.5mm DIA

0.29"

HI 1331

"S" VERSION

8

210 mm

8.25"

21

HI 7082 3.5 M KCl electrolyte solution, 4 x 30 mL bottle, for double

junction electrodes

HI 8082 3.5 M KCl electrolyte solution, 4 x 30 mL FDA bottle, for double

junction electrodes

HI 8093 1 M KCl+AgCl electrolyte solution, 4 x 30 mL FDA bottle, for

double junction electrodes

ORP SOLUTIONS

HI 7091M Reducing pretreatment solution, 230 mL bottle
HI 7091L Reducing pretreatment solution, 500 mL bottle
HI 7092M Oxidizing pretreatment solution, 230 mL bottle
HI 7092L Oxidizing pretreatment solution, 500 mL bottle
HI 7020M Test solution @200-275 mV, 230 mL bottle
HI 7020L Test solution @200-275 mV, 500 mL bottle
HI 7021M Test solution @240 mV, 230 mL bottle
HI 7021L Test solution @240 mV, 500 mL bottle
HI 7022M Test solution @470 mV, 230 mL bottle
HI 7022L Test solution @470 mV, 500 mL bottle

pH ELECTRODES

B = BNC CONNECTION PLUG + 1 m (3.3’) CABLE

S = SCREW-TYPE CONNECTOR

HI 1043B / HI 1040S

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

12 mm

0.5"

HI 1043

"S" VERSION

9.5mm DIA

120 mm

4.7"

0.37"

HI 1053B / HI 1050S

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

12 mm

0.5"

pp

H CALIBRATIONH CALIBRATION

p

H CALIBRATION

pp

H CALIBRATIONH CALIBRATION

For better accuracy, frequent calibration of the instrument is recommended.
The instrument should be recalibrated for pH:

a) Whenever the pH electrode or temperature probe is replaced
b) At least once a week
c) After testing aggressive chemicals
d) When extreme accuracy is required

PREPARATION

Pour small quantities of pH 7.01 (HI 7007) and pH 4.01 (HI 7004) or pH

10.01 (HI 7010) buffer solutions into two clean beakers.
For accurate calibration use two beakers for each buffer solution, one for rinsing

the electrode tip, and one for calibration. In this way contamination of the
buffers is minimized.

For measurements in acidic samples, it is recommended to calibrate the meter
by using pH 7.01 (HI 7007) and pH 4.01 (HI 7004) buffers, while for
alkaline measurements use pH 7.01 (HI 7007) and pH 10.01 (HI 7010)
buffers.

PROCEDURE

• Connect the pH electrode and the temperature probe,
then switch the meter ON.

• Remove the electrode protective cap, rinse the electrode
tip with pH 7.01 solution, then immerse the pH
electrode and temperature probe into pH 7.01 buffer
solution; stir gently and wait a few minutes for the
electrode to stabilize and reach thermal equilibrium.

Note: The electrode should be submerged approximately 4

cm (1½") into the solution. The temperature probe
should be located close to the pH electrode.

• Press RANGE to display pH measurement.

• Press CAL to enter the calibration mode. The buffer value @25°C (77°F) and
the "pH" symbol will blink on the display.

HI 1053

"S" VERSION

20

120 mm

4.7"

• The meter expects a pH 7.01 buffer.

9

• When the buffer value is recognized and the

reading is stable, an acoustic signal (if en­abled) advises the user, the "pH" symbol stops
flashing, the hourglass indicator disappears
and the "CFM" tag starts blinking to indicate
that the value can be confirmed.

• Press CFM to store the first calibration point.

• The meter expects a pH 4.01 or 10.01 buffer.

• Rinse and immerse the pH electrode and the

temperature probe in pH 4.01 or pH 10.01
buffer (2nd calibration point) and stir gently.

• When the buffer value is recognized and the

reading is stable, an acoustic signal (if en­abled) advises the user, the "pH" symbol stops
flashing, the hourglass indicator disappears
and the "CFM" tag starts blinking to indicate
that the value can be confirmed.

• Press CFM to store the second calibration point.

• The meter returns to normal mode.

The pH calibration is now complete; "CAL" and the
pH tags corresponding to the buffers used for
calibration are lit on the LCD.

Notes:

• If the buffer value is not recognized, after 12 seconds the meter will display
blinking dashes together with the "WRONG"
tag. Either the buffer solution is wrong or out
of specification and needs to be replaced or the
electrode is damaged.

• The meter will retain the calibration if the battery is removed.

• To quit calibration and keep previous data: press CAL after entering the
calibration mode and before the first point is accepted.

• To perform a single-point calibration: press CAL after the first point has been
confirmed.

ACCESSORIESACCESSORIES

ACCESSORIES

ACCESSORIESACCESSORIES

pH CALIBRATION SOLUTIONS

HI 70004P pH 4.01 buffer solution, 20 mL sachet (25 pcs)
HI 7004M pH 4.01 buffer solution, 230 mL bottle
HI 7004L pH 4.01 buffer solution, 500 mL bottle
HI 8004L pH 4.01 buffer solution, 500 mL FDA bottle
HI 70007P pH 7.01 buffer solution, 20 mL sachet (25 pcs)
HI 7007M pH 7.01 buffer solution, 230 mL bottle
HI 7007L pH 7.01 buffer solution, 500 mL bottle
HI 8007L pH 7.01 buffer solution, 500 mL FDA bottle
HI 70010P pH 10.01 buffer solution, 20 mL sachet (25 pcs)
HI 7010M pH 10.01 buffer solution, 230 mL bottle
HI 7010L pH 10.01 buffer solution, 500 mL bottle
HI 8010L pH 10.01 buffer solution, 500 mL FDA bottle

STORAGE & CLEANING SOLUTIONS

HI 70300M Storage solution, 230 mL bottle
HI 80300M Storage solution, 230 mL FDA bottle
HI 70300L Storage solution, 500 mL bottle
HI 80300L Storage solution, 500 mL FDA bottle
HI 70000P Electrode rinsing solution, 20 mL sachet (25 pcs.)
HI 7061M General cleaning solution, 230 mL bottle
HI 8061M General cleaning solution, 230 mL FDA bottle
HI 7061L General cleaning solution, 500 mL bottle
HI 8061L General cleaning solution, 500 mL FDA bottle
HI 7073M Protein cleaning solution, 230 mL bottle
HI 8073M Protein cleaning solution, 230 mL FDA bottle
HI 7073L Protein cleaning solution, 500 mL bottle
HI 8073L Protein cleaning solution, 230 mL FDA bottle
HI 7074M Inorganic cleaning solution, 230 mL bottle
HI 7074L Inorganic cleaning solution, 500 mL bottle
HI 7077M Oil & Fat cleaning solution, 230 mL bottle
HI 8077M Oil & Fat cleaning solution, 230 mL FDA bottle
HI 7077L Oil & Fat cleaning solution, 500 mL bottle
HI 8077L Oil & Fat cleaning solution, 500 mL FDA bottle

If the temperature probe is not connected and manual temperature compensa­tion is required, follow the procedure below:

• Press RANGE to select the temperature mode.

• Rinse the pH electrode and place it into the pH 7.01 buffer, stir briefly and

wait a few minutes to reach thermal equilibrium.

10

REFILLING ELECTROLYTE SOLUTIONS

HI 7071 3.5 M KCl+AgCl electrolyte solution, 4 x 30 mL bottle, for single

junction electrodes

HI 8071 3.5 M KCl+AgCl electrolyte solution, 4 x 30 mL FDA bottle, for

single junction electrodes

HI 7072 1 M KNO3 electrolyte solution, 4 x 30 mL bottle

19

For refillable electrodes, if the refill solution (electrolyte) is more than 2.5 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.

• Rinse the temperature probe of a ChecktempC (or ChecktempF) or another

accurate thermometer, and place it close to the pH electrode.

• Use the UP and DOWN arrow keys to manually adjust the temperature to

match the reference thermometer.

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:For refillable electrodes:

For refillable electrodes:

For refillable electrodes:For refillable electrodes:

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

•

Protein

•

Inorganic

•

Oil/grease

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.

Soak in HI 7061 general cleaning solution for approxi­mately 30 minutes.

Soak in HI 7073 protein cleaning solution for 15 min.
Soak in HI 7074 inorganic cleaning solution for 15

minutes.
Rinse with HI 7077 Oil & Fat cleaning solution for 1

minute.

• Follow the pH calibration procedure explained in the previous pages.

pp

H BUFFER TEMPERATURE DEPENDENCEH BUFFER TEMPERATURE DEPENDENCE

p

H BUFFER TEMPERATURE DEPENDENCE

pp

H BUFFER TEMPERATURE DEPENDENCEH 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.

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

TEMP pH VALUES
°C °F 4.01 7.01 10.01

0

32

4.01

7.13

10.32

5

41

4.00

7.10

10.24

10

50

4.00

7.07

10.18

15

59

4.00

7.04

10.12

20

68

4.00

7.03

10.06

25

77

4.01

7.01

10.01

30

86

4.02

7.00

35

95

4.03

6.99

40

104

4.04

6.98

45

113

4.05

6.98

50

122

4.06

6.98

55

131

4.07

6.98

60

140

4.09

6.98

65

149

4.11

6.99

70

158

4.12

6.99

75

167

4.14

7.00

80

176

4.16

7.01

85

185

4.17

7.02

90

194

4.19

7.03

95

203

4.20

7.04

9.96

9.92

9.88

9.85

9.82

9.79

9.77

9.76

9.75

9.74

9.73

9.74

9.75

9.76

18

11

MENU SELECTIONMENU SELECTION

MENU SELECTION

MENU SELECTIONMENU SELECTION

While in normal measurement mode, press and hold the CFM/SETUP key for about
5 seconds until the meter enters the menu selection mode.
The following parameters can be set from the menu:

1. Auto-off feature: 20 minutes (default setting) or disabled;

2. Acoustic signal: enabled (default setting) or disabled;

3. Temperature unit: °C (default setting) or °F.

When entering the menu mode, the auto-off selection is entered. The LCD shows
in three subsequent screens "Auto", "OFF" and "20" to indicate that the 20
minutes selection is active, or "Auto", "OFF" and "no" if the feature is disabled.

The user can toggle the selection by pressing CAL/SELECT or move to the next
step with CFM/SETUP.

The following selection is the acoustic signal, which is displayed on two
subsequent screens: "bEEP", "OFF" when the feature is disabled, and "bEEP",
"On" when the feature is enabled.

ELECTRODE CONDITIONING & MAINTENANCEELECTRODE CONDITIONING & MAINTENANCE

ELECTRODE CONDITIONING & MAINTENANCE

ELECTRODE CONDITIONING & MAINTENANCEELECTRODE CONDITIONING & MAINTENANCE

Press CAL/SELECT to toggle the selection and CFM/SETUP to move to next step.
At this point it is possible to set the temperature unit, by selecting "Unit", "°C"

or "Unit", "°F".

Press CAL/SELECT to toggle the selection and CFM/SETUP to exit the menu
selection mode and return to normal measurement mode.

12

Only for refillable electrodes; must be open while measuring.

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.

17

TROUBLESHOOTING

mm

V CALIBRATIONV CALIBRATION

m

V CALIBRATION

mm

V CALIBRATIONV CALIBRATION

Symptom Problem Solution

Slow reponse or Dirty pH electrode Soak the electrode tip
excessive drift in HI 7061 solution for

30 minutes

Reading fluctuates Clogged/dirty junction Soak the electrode tip
up and down (noise) or low electrolyte level in warm HI 7082

(refillable electrodes) solution for one hour,

then rinse it with
distilled water
(refill with fresh
electrolyte if necessary)

Blinking full scale Reading is out of range
value

Blinking "°C" (or "°F") Temperature probe is not connected or broken
"WRONG" & Calibration error Check buffer solution or

blinking dashes replace pH electrode
Blinking battery Low battery level Recharge or

symbol replace battery
Meter shuts off Auto-off enabled or

dead battery Replace battery

"Clr" message Loaded default Perform pH calibration

pH calibration values

"Er1" and Er2" EPROM error Contact your dealer or
messages HANNA Service Center

HI 8424NEW 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 instruments® Customer Service

Center for more information.

TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION

TEMPERATURE CALIBRATION

TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION

HI 8424NEW has been accurately precalibrated for temperature at the factory.
For optimum accuracy, it is recommended to recalibrate the meter for tempera-

ture at least once a year.
Contact your dealer or the nearest HANNA instruments® Customer Service

Center for more information.

Note: For field applications, it is always recommended to keep a conditioned spare elec-

trode handy. When anomalies cannot be resolved with simple maintenance, change
the electrode and recalibrate the meter.

16

13

BATTERY RECHARGE AND REPLACEMENTBATTERY RECHARGE AND REPLACEMENT

BATTERY RECHARGE AND REPLACEMENT

BATTERY RECHARGE AND REPLACEMENTBATTERY RECHARGE AND REPLACEMENT

LCD MESSAGES & TROUBLESHOOTINGLCD MESSAGES & TROUBLESHOOTING

LCD MESSAGES & TROUBLESHOOTING

LCD MESSAGES & TROUBLESHOOTINGLCD MESSAGES & TROUBLESHOOTING

The meter displays the remaining battery percent­age when turned on. When the level is below 5%,
the battery symbol on the bottom left of the LCD
blinks to indicate a low battery condition.
If the battery level is low enough to cause erroneous readings, the Battery Error
Prevention System (BEPS) turns the meter

The 9V battery provided with the instrument can be recharged using the
optional HI 710040 battery charger.

Plug the recharger and the green LED will turn on, then put the meter on the
recharger and the LED will turn to orange, to indicate that the battery is
charging.

It will take approx. 14 hours to completely charge the battery.
The supplied 9V Ni-MH recharge-

able battery can last for about
5 years. When the battery needs
to be replaced, remove the cover
on the rear of the meter and
replace the rundown battery with
a new one, while paying atten­tion to the correct polarity.
Reattach the back making sure
that the gasket is in place and
tighten the 3 screws to ensure a
good seal.

Replacement should take place in a non-hazardous area using a 9V Ni-MH
rechargeable battery.

Note: The meter can also be powered with a normal 9V alkaline battery.

NEVER USE THE HI 710040 CHARGER WITH NON-RECHARGEABLE
BATTERY.

Note: Dispose of the Ni-MH battery according to local regulations.

off.

TAGS & SYMBOLS

• pH, mV, °C, °F Measurement unit of the selected mode

• ATC Indicates Automatic Temperature Compensation (in pH

or temperature mode)

• MTC Indicates Manual Temperature Compensation (in pH

or temperature mode)

• HOLD Blinks when in Hold mode. Reading frozen on LCD.

The user can scroll through the three ranges by
pressing RANGE

• CAL In pH calibration mode, or in pH mode when the

meter is calibrated

• CFM Blinks in pH calibration mode when the meter is ready

to confirm a value

• WRONG During pH calibration, when the meter does not

recognize the pH buffer

•% At startup, when showing the percentage of the

remaining battery life

• In pH mode, when meter was calibrated with pH 7.01

buffer

• In pH mode, when meter was calibrated with pH 4.01

buffer

• In pH mode, when meter was calibrated with pH

10.01 buffer

• (hourglass symbol): When reading is not stable

• (battery symbol): At startup, if remaining battery life is below 5%

14

15