Instruction Manual

HI 8424
Portable Meter of
pH/mV/Temperature

HANNA INSTRUMENTS is at your service.

Whenever you have doubts, suggestions, and/or complaints

if you need more information, do not hesitate to
contact us.
11 2076-5080
E-mailassistencia@hannabrasil.com
www.hannabrasil.com
1027/1039 Pretoria Street - Vila Formosa
São Paulo - SP - 03416-000 - Brazil
 Dear Customer,
Congratulations! Now that you have acquired your HI 8424, Hanna
Instruments is committed to proving that you did a
great investment, conquering, increasingly, your
trust in our products.
This manual was created with your well-being in mind and
your company. It brings simple and objective instructions so that
you get the most out of your device, with
the quality and safety that you deserve.

GUARANTEE

IMPORTANT
PRODUCT WARRANTY
To have the right to the warranty, you must keep
The Warranty Certificate and the Purchase Invoice.

INDEX
PRELIMINARY EXAMINATION ..................................................................... 3
GENERAL DESCRIPTION ........................................................................ 3
FUNCTIONAL DESCRIPTION ............................................................... 4
SPECIFICATIONS ........................................................................... 5
OPERATIONAL GUIDE.............................................................. 6
pH CALIBRATION...................................................................... 9
pH VALUES AT VARIOUS TEMPERATURES............................ 12
MENU SELECTION..................................................................... 13
CALIBRATION mV ........................................................................ 14
TEMPERATURE CALIBRATION .................................................. 14
REPLACEMENT OF THE BATTERY .............................. 15
DISPLAY MESSAGE GUIDE ............................................... 16
MAINTENANCE AND PACKAGING OF THE ELECTRODE .................. 17
ACCESSORIES................................................................. 19
REFERENCE GUIDE FOR pH ELECTRODE APPLICATIONS .............. 25

2 1
 USER RECOMMENDATIONS PRELIMINARYEXAM
nBefore using the device, make sure it is
adapted to the environment where it will be used. Remove the instrument from the packaging and examine it. Make sure that
nThe use of this device in residential areas can cause
did not suffer damage during transport. If there is damage, please inform your
interference in radio and television frequencies, which forces reseller.
The user took all the precautions to fix this problem. The meter is provided complete with:
nAny changes that the user makes to the device may HI 1230B - combination pH electrode with double junction
commitment to the performance of EMC. BNC connector and 1 m cable;
nTo avoid electric shocks, do not use the device when the
HI 7662 - temperature probe;
the measurement surface voltage is above 24Vdc or
Standard solution pH 4.01 HI 70004, 20 ml sachet;
60Vdx.
nTo avoid damage or burns, do not attempt to take measurements. Standard solution pH 7.01 HI 70007, 20 ml sachet;
microwave ovens. Cleaning Solution HI 700661, 20 ml sachet (2 units);
9V alkaline battery;
Instruction Manual.
Note: Keep all packaging until you are sure that the
the instrument works correctly. In case of anomaly, all
the instruments and accessories must be returned in their
original packaging.

GENERALDESCRIPTION

The HI 8424 is a portable pH/mV/temperature meter with

microprocessor. It has an advanced user interface,
body protected against bumps, battery percentage indication,
low battery detection, automatic shutdown, calibration
automatic and error codes that guide the user during the
calibration and tracking of problems.
The pH calibration procedure automatically recognizes three
standard values stored: pH 4.01, 7.01 and 10.01.
This instrument can also be used for ISE and ORP measurements.
with automatic range adjustment, when measurements exceed
699.9 mV.
All rights reserved. Total or partial reproduction is prohibited except with The user can set the following parameters by entering a
the written consent of the rights holder. definition mode via the keyboard:
activate or deactivate the auto shut-off feature;
Hanna Instruments reserves the right
to modify the design, the manufacturing, and the appearance
- select the temperature unit, °C or °F;
from their devices without prior notice. turn on or turn off the sound signal.

26 3
 FUNCTIONALDESCRIPTION APPLICATION REFERENCE GUIDE OF
pH electrode
Application Electrodes
Aquarius HI 1332B, HI1312S
2. Bath Water HI 1130B, HI1110S
3. Beer HI 1131B, HI 1111S
4. Bread HI 2031B, FC 200B, HI2020S, FC200S
5. Cheese FC 200B, FC200S
6. Dairy Products FC 911B, FC 100B
7. Dirty Water HI 1230B, HI 1210S
8. Emulsions HI 1053B, HI1050S
9. Environment HI 1230B, HI1210S
Test tubes HI 1331B, HI1310S
11. General use in the food industry FC 911B, FC 100B
12. Fruit FC 200B, FC 220B, FC 200S
13. Organic fruit juices FC 210B
14. Galvanizing waste solution HI 1130B, HI 1110S
15. High purity water HI 1053B, HI1050S
Horticulture HI 1053B, FC 200B, HI1050S, FC 200S
17. Usogeralemlaboratório HI 1131B, HI 1230B, HI 1332B, HI 1330B
HI1111S, HI 1210S, HI1312S, HI 1310S
18. Leather HI1413B, HI1410S
19. SucodeLemon FC100B
20. Meat FC200B, HI 2031B, FC200S, HI2020S
21. Micro-sampling smaller HI 1083B
100ml
Milk & Yogurt FC 210B
23. Inks HI 1053B, HI 1050S
24. Paper HI 1413B, HI 1410S
Photographic chemicals HI 1230B, HI 1210S
26. Quality control HI 1332B, HI1312S
27. Sausages FC 200B, HI 2031B, FC200S, HI 2020S
BNC connector for pH or ORP electrodes and RCA connector 28. Semisolid products HI 2031B, HI 2020S
29. Pele HI 1413B, HI 1410S
for the temperature probe. 30. Soil samples HI 1230B, HI1210S
2) Display (LCD). Solvents HI 1043B, HI1040S
32. Acidoforte HI 1043B, HI1040S
3) RANGE key to select pH, mV, or temperature range. 33. Application in Immersion HI 1130B, HI1110S
4) Up arrow key to manually set the temperature 34. Measurements on the surface HI 1413B, HI1410S
when the probe is not connected. 35. Pools H I1130B, HI 2114P/2
36. Titulations with a band HI 1131B, HI 1111S
5) CAL/SELECT key to enter calibration mode, to constant temperature
select the menu options. 37. Titrations with range of
broad temperature
HI 1131B, HI 1111S

6) CFM/SETUP key to confirm the calibration data, 38. Very high humidity FC 911B
to enter and exit the settings menu and to confirm the Buckets HI 1330B, HI1310S
selected options. 40. Wine processing FC 220B

7) Down arrow key to manually set the

temperature when the probe is not connected. B = BNC type connector S = Screw type connector
8) HOLD key to freeze the reading on the display. All electrodes with a termination in "B" are supplied with cable
ON/OFF button to turn the instrument on or off. 1 m BNC connector

4 25
HI 1413B
Combination pH electrode, non-refillable, glass body, SPECIFICATIONS
unique junction, flat end, Viscolene. Usage: measurements on the surface.

Band -2.00 to 16.00 pH

699.9 mV / 1999 mV
-20.0 a 120.0°C / -4.0 a 248.0°F
Resolution 0.01 pH
0.1 mV / 1 mV
ORP ELECTRODES 0.1°C / 0.1°F
HI 3131B / HI 3111S Precision 0.01 pH
Combination ORP electrode, filled, in platinum, with body (a 20°C/68°F) 0.2 mV / 1 mV
in glass. Use: titration. 0.4°C / 0.8°F
Standard Deviation 0.02 pH
EMC 0.2 mV / 1 mV
0.4°C / 0.8°F
pH calibration Automatic, 1 or 2 points
with 3 memorized patterns
HI 3230B / HI 3210S (pH 4.01, 7.01, 10.01)
Combination ORP electrode, gel-filled, made of platinum,
Offset Calibration 1 pH
with a plastic body (PEI). Use: general use.
Slope Calibration from 75 to 110%
Compensation of Automatic
Temperature -20 to 120°C (-4 to 248°F)
or manual, without temperature probe
Probes (included) pH electrode HI 1230B
temperature probe HI 7662
HI 4430B / HI 4410S Type of batteries 1 alkaline 9V battery (IEC 6LR61)
Combination ORP electrode, gel-filled, in gold, Life of the batteries 150 hours of continuous use
with a plastic body (PEI). Use: general use. Turn off automatically. Selectable: 20 min. or disabled

Environment 0 to 50°C
max 95% non-condensable HR
Dimensions 164 x 76 x 45 mm
Weight 320 g with probes

Note: PEI - PolyEther-Imide

24 5
 FC 100B
OPERATIONALGUIDE Combination pH electrode, with double junction, with filling and
plastic body (PVDF). Use: general use for the food industry.
INITIAL PREPARATION
The meter comes complete with a 9V battery. Remove the
battery compartment cover on the back of the meter
and install the battery, paying attention to its polarity.
Remove the protective cap from the electrode before proceeding
any measurements. If the electrode dried out, immerse the tip in FC 200B / FC 200S
storage solution HI 70300 or standard solution pH 7 Combination pH electrode, with single junction, without filling and
for a few hours or overnight, to reactivate it. with a plastic (PVDF) body, conical, Viscolene. Usage: meat & cheese.
Connect the pH electrode to the BNC connector at the top of the instrument.
• Connect the temperature probe to the RCA connector. The probe of
temperature can be used independently to take measurements
of temperature, or it can be used in conjunction with the electrode of
pH, to utilize the CAT capability of the meter.
• Turn on the meter by pressing the ON/OFF button. The display indicates
for a few seconds all the used segments (or while FC 210B
the button is pressed), followed by the indication of the percentage Combination pH electrode, non-filled, double junction,
of remaining battery life, and then enters normal measurement mode. glass body, conical, Viscolene. Use: milk, yogurt.

PERFORM pH MEASUREMENTS
FC 220B
To measure pH, just
Combination pH electrode, filled, single junction, body in
dive the end of the electrode (by
glass, triple ceramic. Use: food processing.
minus 4cm) and the temperature probe in
sample to be tested.
•SelectthepHmodebypressingthekey
RANGE until the display changes to pH.
Carefully shake the electrode and wait
until the symbol of stability (hourglass)
turn off. The display will indicate the value FC 911B
of pH automatically compensated by CombinationpHelectrode,withdoublejunction,built-inamplifier,with
temperature. fillingandbodyinplastic(PVDF).Use:veryhighhumidity.

Notes:
TomakeaccuratepHmeasurements,ensurethattheinstrument
was calibrated before use (see page 9).
• If the measurements are made on different samples successively,
It is recommended to thoroughly rinse the electrode to avoid contamination.
Note: PVDF - PolyVinyliDene Fluoride

6 23
HI 1230B / HI 1210S crusade. After cleaning, it is recommended to rinse the electrode with
Combination pH electrode, double junction, gel filled some of the samples to be tested.
the body in plastic (PEI). Use: general use.
Temperature Compensation
The meter was designed to compensate for temperature, since
the response of the pH electrode is directly affected by it.
Automatic Temperature Compensation (ATC indicated in
visor)
HI 1330B / HI 1310S To use the CAT function, immerse the temperature probe in
Combination pH electrode, glass body, semimicro, junction sample, as close as possible to the electrode, and wait a few minutes.
The indicated pH reading is temperature compensated.
unique, with filling. Usage: laboratory. from the sample.
Manual Temperature Compensation (MTC
indicated on the display
If the temperature probe is not connected, it is
it is possible to enter the value manually.
HI 1331B / HI 1311S • Register the sample temperature using a
Combination pH electrode, glass body, semimicro, junction ChecktempC, or another precise thermometer.
unique, with filling. Use: test tubes. • Press RANGE to select the mode of
temperature. The symbol "°C" will blink to indicate that the probe
temperature is not on.

HI 1332B / HI 1312S Use the UP and DOWN keys to indicate and set the temperature
Combination pH electrode, double junction, with filling and body of the sample (e.g.: 25°C).
made of plastic (PEI). Use: general.

• Press RANGE to select the pH measurement mode and

immerse the electrode in the sample. The indicated pH reading will be
HI 2031B / HI 2020S compensated by the temperature at the defined value (in this case, at 25°C).
Combination pH electrode, glass body, semimicro, with CARRY OUT ORP MEASUREMENTS
filling, conical. Use: semi-solid products. ThemeasurementsofOxidationReductionPotential(ORP)provideaquantification
of the oxidizing or reducing power of the sample to be tested.
ConnecttheORPelectrode(optional)totheBNCconnector.
Toenter'mV'mode,turnontheinstrumentandpresstherangekey.
until the display changes to mV.
•ImmersethetipoftheORPelectrode(by
minus4cm)inthesampletobetestedandwaitafew
Note: PEI - PolyEther-Imide
minutes until the reading stabilizes (symbol of

22 7
 hourglass turns off). pH electrodes
Measurements within the range of 699.9 mV are indicated with
B = BNC CONNECTION SOCKET + 1m OF CABLE
resolution of 0.1 mV, while outside this range the resolution
it is 1 mV.
Notes:
In order to make accurate ORP measurements, the surface of the electrode
S = SCREW TYPE CONNECTOR
The ORP must be clean and smooth.
When not in use, the electrode should be kept
hydrated and free from any mechanical pressure that may
cause damage to the glass/platinum joint. HI 1043B / HI 1040S
Combination pH electrode, with double junction, glass body,
CARRY OUT TEMPERATURE MEASUREMENTS
with filling. Use: strong acids/alkalis.
Turn on the instrument and press the RANGE key to select the
temperature mode.
Make sure that the temperature probe is connected to the meter.
Immerse the temperature probe in the sample, wait until
stabilize (hourglass symbol turns off) and read the value of
temperature.
Temperature measurements can be indicated in units °C HI 1053B / HI 1050S
or °F (see the 'Menu Selection' for more details). Combination pH electrode, with glass body, triple ceramic,
conical shape, with filling. Use: emulsions.
NOTES:
A full-range value intermittently means that the reading
it is out of range.
To lock a reading on the display
while in measurement mode,
press the HOLD key. The indication "HOLD"
it will blink. The values of pH, mV, and temperature are maintained, and
HI 1083B
You can use the RANGE key to view them. Press HOLD. Combination pH electrode, with glass body, micro, Viscolene,
again to return to normal mode.
without filling. Use: biotechnology, micro-titration.
If active, pressing the keys is followed by a sound signal.
A lower sound means that the key is not currently pressed.
active.
To increase the battery life, the meter has a
automatic shutdown function, which turns off the meter
after 20 minutes of inactivity. This function can be disabled.
by the user (see 'Menu Selection' for more details). HI 1131B / HI 1111S
Combination pH electrode, with glass body, single junction, with
filling. Use: general.

8 21
HI 7072 ElectrolyticSolution1MKNO3,4x30ml
HI 8072 Electrolyticsolution1MKNO3,4x30ml(FDAapprovedvials)
pH calibration
HI 7082 Electrolyticsolution3.5MKCl,4x30ml,forelectrodesof
doublejunction Forgreateraccuracy,frequentcalibrationoftheinstrumentisrecommended.
HI 8082 Electrolytic solution 3.5M KCl, 4 x 30 ml, for electrodes of The instrument must be recalibrated for pH when:
doublejunction(vialsapprovedforFDA)
a) Whenever the pH electrode and the temperature probe are
HI 8093 Electrolytic solution 1M KCl + AgCl, 4 x 30 ml, for
substituted.
doublejunctionelectrodes(FDAapprovedbottles)
At least once a month.
PRE-TREATMENT SOLUTIONS FOR ORP
c) After using harsh chemicals.
HI 7091M Reducing pre-treatment solution, 230 ml bottle
HI 7091L Reducing pre-treatment solution, 460 ml bottle d) When extreme precision is necessary.
HI 7092M Oxidizingpre-treatmentsolution,230mlbottle PREPARATION
HI 7092L Oxidativepre-treatmentsolution,460mlbottle Pour small amounts of standard solution pH7.01 (HI 7007) and
HI 7020M TestSolution,200-275mV,230mlbottle pH 4.01 (HI 7004) or pH 10.01 (HI 7010) in two clean cups.
HI 7020L TestSolution,200-275mV,460mlbottle
For accurate measurement, use two graduated cups for each solution.
HI 7021M TestSolution,240mV,230mlbottle
standard; the first to rinse the electrode and the second to
HI 7021L TestSolution,240mV,460mlbottle
calibration, to minimize the contamination of the standard solutions.
HI 7022M TestSolution,470mV,230mlbottle
HI 7022L TestSolution,470mV,460mlbottle RINSE CALIBRATE
OTHER ACCESSORIES
ChecktempC Pocket thermometer (range -50.0 to 150.0°C)
HI710001 Flexible transport bag
HI710009 Blue protective rubber For measurements of acidic samples, it is recommended to calibrate the meter.
HI710010 Orangeprotectiverubber
using pH standards 7.01 (HI 7007) and pH 4.01 (HI 7004).
HI710031 Rigid transport suitcase
HI 721312Rigidcasefortransportwithsun.standardpH4.01&pH7.01 For alkaline measurements, use pH standards 7.01 (HI 7007)
HI 76405 Electrodeholder pH 10.01 (HI 7010).
HI 7662 Temperature probe with 1m protected cable
HI 8427 pH/ORPelectrodesimulatorwith1mcoaxialcableand PROCEDURE
BNCconnector
Connect the pH electrode and the temperature probe.
HI931001pH/ORPelectrodesimulatorwithdisplay,cable
Then, turn on the meter.
1mcoaxialandBNCconnector
EXTENSION CABLES FOR TYPE ELECTRODES
Remove the protective cap from the electrode, rinse its tip.
TIGHTEN TO BNC CONNECTOR with a pH 7.01 solution, then immerse it along with the probe
at a temperature in standard solution pH 7.01; stir carefully
and wait a few minutes until the electrode
stabilize and reach thermal equilibrium.
HI7855/1 1m extension cable Note: The pH electrode must be submerged 4
HI 7855/3 3m extension cord cm in the solution and the temperature probe
HI 7855/5 5m extension cable must be positioned as close to him as possible.
HI 7855/10 10m extension cord
HI 7855/15 15m extension cord

20 9
• Press RANGE to indicate the pH measurement.
• Press CAL to enter calibration mode. The default value
ACCESSORIES
at 25°C the "pH" symbol will blink on the display. pH calibration solutions
HI 70004PStandard solution pH 4.01, 20 ml sachet (25 units)
HI 7004M StandardsolutionpH4.01,230mlbottle
HI 7004L StandardsolutionpH4.01,500mlbottle
HI 8004L StandardsolutionpH4.01,500mlbottleapprovedbytheFDA
The meter expects a pH standard of 7.01. HI 70007PStandard solution pH 7.01, 20 ml sachet (25 pcs.)
• When the default value is recognized and the reading is stable, a HI 7007M StandardsolutionpH7.01,230mlbottle
sound signal (if active) warns the user, the symbol "pH" stops from HI 7007L StandardsolutionpH7.01,500mlbottle
to blink, the hourglass indicator HI 8007L StandardsolutionpH7.01,500mlbottleapprovedbytheFDA
disappears and the symbol "CFM" begins to HI 70010PStandard solution pH 10.01, 20 ml sachet (25 units)
blink, indicating that the value may be HI 7010M StandardsolutionpH10.01,230mlbottle
confirmed. HI 7010L StandardsolutionpH10.01,500mlbottle
HI 8010L StandardsolutionpH10.01,500mlbottleapprovedbytheFDA
Press CFM to save the first
calibration point.
CLEANINGAND STORAGE SOLUTIONS
HI70300MStorageSolution,230mlbottle
The meter expects a pH standard of 4.01
HI80300MStorageSolution,230mlbottleapprovedbytheFDA
or 10.01. If the pattern is not recognized, HI 70300LStorage Solution, 460 ml bottle
after 12 seconds the meter will indicate HI 80300LStoragesolution,460mlbottleapprovedbytheFDA
a dashed line intermittently and the symbol HI 70000PElectrode Rinse Solution, 20 ml sachet (25 units)
WRONG. HI 7061M GeneralCleaningSolution,230mlbottle
HI 8061M GeneralCleaningSolution,230mlbottleapprovedbytheFDA
Rinse and immerse the pH electrode and the temperature HI 7061L GeneralCleaningSolution,460mlbottle
probe
in standard solution pH 4.01 or pHo 10.01 (2 point calibration) HI 8061L GeneralCleaningSolution,460mlbottleapprovedbytheFDA
and act carefully. If the pattern is not recognized, after 12 HI 7073M ProteinCleaningSolution,230mlbottle
seconds or the meter will indicate a dashed line intermittently and the symbol HI 8073M S.ProteinCleaning,230mlbottleapprovedbytheFDA
WRONG. HI 7073L ProteinCleaningSolution,460mlbottle
When the default value is recognized and HI 8073L S.ProteinCleaning,230mlbottleapprovedbytheFDA
HI 7074M InorganicCleaningSolution,230mlbottle
the reading is stable, an audible signal
HI 7074L InorganicCleaningSolution,460mlbottle
(if active) notifies the user, the symbol
HI 7077M Oil&GreaseCleaningSolution,230mlbottle
"pH" stops flashing, the indicator of
HI 8077M Oil & Grease Cleaning Solution, 230 ml bottle
hourglass disappears and the symbol "CFM" approved by the FDA
starts to flash indicating that the value HI 7077L Oil&GreaseCleaningSolution,460mlbottle
can be confirmed. HI 8077L Oil & Grease Cleaning Solution, 460 ml bottle
•Press CFM to save the second approved by the FDA
calibration point.
The meter returns to normal mode. ELECTROLYTIC FILLING SOLUTIONS
The pH calibration is now complete; the symbols "CAL" and pH HI 7071 Electrolytic solution 3.5M KCl + AgCl, 4 x 30 ml, for
corresponding to the standards used for calibration light up in the singlejunctionelectrodes
visor. HI 8071 Electrolytic solution 3.5M KCl + AgCl, 4 x 30 ml, for
singlejunctionelectrodes(FDAapprovedvials)

10 19
GUIDE TO POSSIBLE PROBLEMS Notes:
Evaluatetheperformanceoftheelectrodebasedonthefolowing: The meter remembers the calibration if the battery is removed.
Noise (the readings alternate up and down) can occur due to:• To exit calibration and retain previous data: press
–Blocked/Dirty Joint: see the cleaning procedure indicated above. CAL after entering calibration mode and before the first
Loss of protection due to low electrolyte solution level: point to be accepted.
Filitagainwiththeappropriatesolution. To perform a single point calibration: press CAL after
•Membrane/Dry Junction: immerse in storage solution HI 70300 the first point has been confirmed.
for1hour. If the default value is not recognized, the meter will indicate a
•Deriva: immerse the electrode tip in HI 7082 warm solution (approx. intermittently dashed, together
50-60°C)foronehourandrinsethetipwithdistilledwater(fill with the symbol "WRONG". The solution
againwithelectrolyticsolution,ifnecessary).
the standard is wrong or out of the
•Low Slope: see the cleaning procedure indicated above.
specifications and needs to be replaced.
• WithoutSlope:checkforcracksintheglassstemorinthebulboftheelectrode
(replacetheelectrodeincaseofcracks). If the temperature probe is not connected and is needed to
manual temperature compensation, follow the following procedure:
Slow response/Excessive drift: immerse the tip in HI 7061 solution Press RANGE to select the temperature mode.
for 30 minutes, rinse well with distilled water and then proceed with the
cleaningprocedure Rinse the pH electrode and place it
For ORP electrodes: polish the metal tip with a in the pH 7.01 standard, shake
slightlyabrasivesandpaper,beingcarefulnottoscratchthesurface, a little and wait a few minutes
thenwashwellwithwater. to achieve thermal equilibrium.
Note:Forfieldapplications,itisrecommendedtoalwayshaveanelectrodeavailable. Rinse the temperature probe of a
conditionedoverpass.Whentheanomaliescannotberesolved ChecktempC or another precise thermometer,
Withasimplemaintenance,replacetheelectrodeandrecalibratethemeter. and place it next to the pH electrode.
• Record the standard temperature with the thermometer, e.g., 20°C.
Use the UP and DOWN arrow keys to manually adjust
the temperature of the current value.
• Follow the pH calibration procedure explained on the pages
previous.

18 11
 pH VALUES AT VARIOUS TEMPERATURES MAINTENANCE & PACKAGING OF THE ELECTRODE
PREPARATION
The following table indicates how the values of the pH standards vary.
with the temperature. Removetheprotectivecover.
DONOTBESURPRISEDIFTHEREARESALTRESIDUES.
During calibration, the meter will indicate the standard value at 25°C.
Thisisnormalontheelectrodes,disappearingwhenwashedwithwater.
but will use the value corresponding to the temperature standard Duringtransport,smallairbubblescanforminsidetheglassbulb.
internal. affectingtheproperfunctioningoftheelectrode.Thesebubblescanberemovedbys'haking'.
theelectrode,asifitwereaglassthermometer.
TEMP pH values Ifthebulband/orthejunctionisdry,immersetheelectrodeintheStorageSolution.
°C 4.01 7.01 10.01 HI70300foratleastonehour.
0 32 4.01 7.13 10.32 Forfilingelectrodes,ifthefilingsolution(electrolytic)isbelowthehole
5 41 4.00 7.10 10.24 forfiling(morethan2½cm),addtheappropriateElectrolyticSolution.
10 50 4.00 7.07 10.18 MEASUREMENT
15 59 4.00 7.04 10.12 Rinsetheendoftheelectrodewithdistilledwater,dipit(4cm)intothesample.
20 68 4.00 7.03 June 10 andshakecarefulyforafewseconds.
25 77 4.01 7.01 10.01 Forafasterresponseandtoavoidcross-contaminationofsamples,rinse
30 86 4.02 7.00 9.96 thetipoftheelectrodewiththesolutiontobetested,beforetakinganymeasurements.
35 95 4.03 6.99 9.92 STORAGE
40 104 4.04 6.98 9.88 Tominimizeobstructionandensureaquickresponsetime,theglassbulbandthe
45 113 4.05 6.98 9.85 jointsmustbekepthydratedandcannotdryout.Replacethesolution
50 122 4.06 6.98 9.82 ontheprotectivecapwithsomedropsofStorageSolutionHI70300or
55 131 4.07 6.98 9.79 standardHI7007pH7.01.
60 140 4.09 6.98 9.77 NEVERSTORETHEELECTRODEINDISTILLEDWATER.
65 149 4.11 6.99 9.76 PeriodicMaintenance
70 158 4.12 6.99 9.75 Inspecttheelectrodeandthecable.Thecableusedfortheconnectiontothecontrollermustbe
75 167 4.14 7.00 9.74 intactandthereshouldbenobrokenisolationpointsonthecableorcracksinthebulband
80 176 4.16 7.01 9.73 checktheelectrode.Iftherearecracks,replacetheelectrode.Washwithwaterto
85 185 4.17 7.02 9.74 eliminatethesaltresidues.
90 194 4.19 7.03 9.75 Theconnectorsmustbecleananddry.
95 203 4.20 7.04 9.76 Re-filltheelectrodewithanewelectrolyticsolution(seethespecificationsof
electrodetochoosethecorrectfillingsolution).Waituntiltheelectrode
Restverticallyfor1hour.Followthestorageprocedure.
CLEANINGPROCEDURE
General: Soak in the HannaHI 7061 General Cleaning Solution for approximately 30 minutes.
Removaloffilms,dirtorresiduesonthemembrane/joint:
Proteins: Soak in HannaHI 7073 Cleaning Solution for Proteins for 15 minutes.
Inorganics:DiveintoCleaningSol.forInorganicSubst.HannaHI7074
15minutes.
Oil/fat: Immerse in Sold.eCleaning of Oil & Fat HI7077 for 1 minute.
IMPORTANT:Aftercarryingoutthecleaningprocedures,rinsetheelectrodethoroughlywith
distilledwaterandimmerseitinStorageSolutionHI70300foratleast
for 1 hour, before taking the measurements.

12 17
 DISPLAY MESSAGE GUIDE MENU SELECTION

LABELS & SYMBOLS: Whileinnormalmeasuringmode,pressandholdthe

pH, mV, °C or °F: measurement unit of the selected mode. press the CFM/SETUP key for 5 seconds to enter selection mode
ofthemenu.
ATCindicatesAutomatic Temperature Compensation (in pH mode or
temperature). You can set the following parameters from the menu:
MTCindicates Manual Temperature Compensation (in pH mode or 1.auto-offfunction:20minutes(defaultsetting)ordisabled,
temperature). 2.soundsignal:active(defaultdefinition)ordeactivated,
HOLD: blinks when in Hold mode. Reading is fixed on the 3.unit oftemperature:°C(standarddefinition)or°F.
display.
CALinpHcalibrationmode,orinpHmodewhenthemeter Whenenteringmenumode,gototheautopoweroffselection.
It is calibrated. Thedisplayshowsonthreesubsequentscreens'Auto','OFF'and'20'indicatingthat
CFMflashesinpHcalibrationmodewhenthemeterisready the 20 minute selection is active, or 'Auto', 'OFF' and 'no' if it is
disabled.
toconfirmthevalue.
•7inpHmode,whenthemeterwascalibratedwithpH7standard.
4inpHmode,whenthemeterwascalibratedwithstandardpH4.
10inpHmode,whenthemeterwascalibratedwithpH10standard.
• (hourglass symbol): when the reading is not stable.
TheusercantoggletheselectionbypressingCAL/SELECTormoveto
GUIDE TO POSSIBLE PROBLEMS: thenextstepwithCFM/SETUP.
Thefollowingselectionisthesoundsignal,whichisindicatedontwosubsequentscreens:
•Full intermittent range value: the reading is out
of strip. bEEP
activated.
"°C" intermittent: the temperature probe is not connected
it is broken (when indicating the temperature).
"WRONG" & intermittent dashes: calibration error; check
the standard solution; replace the pH electrode.
• Intermittent battery symbol: battery with low charge;
replace the battery. PressCAL/SELECTtotoggletheselectionandCFM/SETUPtomoveto
thenextstep.
•The meter turns off: - check if the automatic shut-off function
it is connected; in this case the meter turns off At this point, it is possible to program the unit of temperature by selecting
if after 20 min. without use. Unit
battery without charge; replace the battery. PressCAL/SELECTtotoggleselectionandCFM/SETUPtoexitmode
Clr: the meter loaded the calibration values ofmenuselectionandreturntonormalmeasurementmode.
of standard pH; carry out a pH calibration.
Message "Er1-2": EEPROM error; please contact the
Hanna Technical Assistance.

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 CALIBRATIONmV BATTERY REPLACEMENT

The HI 8424 was pre-calibrated with precision in the mV range at the factory.
When turned on, the meter displays the remaining charge percentage.
from the battery. When the level is below
For accurate precision, recalibration of the meter is recommended.
for the mV readings at least once a year. of 5%, the battery symbol, the bottom part
Contact Hanna Technical Assistance for more information. the left side of the meter flashes to indicate a
information. weak stack condition.
If the battery charge level is low enough to cause readings
errors, the Stack Error Prevention System (BEPS) shuts down the
meter.
Loosen the 3 screws of the battery compartment cover and
carefully replace the 9V battery, paying attention to its
CALIBRATION OFTEMPERATURE correct polarity. Reattach the lid, ensuring that
the seal is well fitted and tighten the 3 screws, making sure
that was well pressed.
O HI 8424it was pre-calibrated precisely for the temperature at
factory.
For accurate precision, recalibration of the meter is recommended.
for the temperature at least once a year.
Contact Hanna Technical Assistance for information.
more detailed.

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