SALES & TECHNICAL SERVICE CONTACTS
Instruction Manual
HI 8424NEW
Portable pH/mV/°C Meter
with Automatic Calibration and
Battery Recharging System
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
tech@hannainst.com or see the back cover for our worldwide contact list.
This instrument is in compliance with the
directives.
WARRANTY
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 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 CONFORMITY
PRELIMINARY 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 DESCRIPTION
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.
26
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
3
FUNCTIONAL DESCRIPTION
1)
2)
3)
4)
BNC connector for pH or ORP electrodes
Liquid Crystal Display (LCD)
RANGE key, to select pH, mV or temperature range
Up Arrow key, to manually set the temperature value when no temperature 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
4
p H ELECTRODE APPLICATION
REFERENCE GUIDE
Application
Electrodes *
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
Aquarium
Bath-water
Beer
Bread
Cheese
Dairy products
Dirty water
Emulsions
Environment
Flasks
Food industry general use
Fruit
Fruit juices, organic
Galvanizing waste solution
High purity water
Horticulture
Laboratory general use
18.
19.
20.
21.
Leather
Lemon juice
Meat
Micro plate sampling of less than
100mL
Milk and Yogurt
Paints
Paper
Photographic chemicals
Quality control
Sausages
Semi-solid products
Skin
Soil samples
Solvents
Strong acid
Submersion application
Surface measurements
Swimming pool
Titrations with constant
temperature range
Titrations with wide temperature
range
Very high humidity
Vials and test tube
Wine processing
HI 1332B, HI 1312S
HI 1130B, HI 1110S
HI 1131B, HI 1111S
HI 2031B, FC 200B, HI 2020S, FC 200S
FC 200B, FC 200S
FC 911B, FC 100B
HI 1230B, HI 1210S
HI 1053B, HI 1050S
HI 1230B, HI 1210S
HI 1331B, HI 1310S
FC 911B, FC 100B
FC 200B, FC 220B, FC 200S
FC 210B
HI 1130B, HI 1110S
HI 1053B, HI 1050S
HI 1053B, FC 200B, HI 1050S, FC 200S
HI 1131B, HI 1230B, HI 1332B, HI 1330B
HI 1111S, HI 1210S, HI 1312S, HI 1310S
HI 1413B, HI 1410S
FC 100B
FC 200B, HI 2031B, FC 200S, HI 2020S
HI 1083B
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
FC 210B
HI 1053B, HI 1050S
HI 1413B, HI 1410S
HI 1230B, HI 1210S
HI 1332B, HI 1312S
FC 200B, HI 2031B, FC 200S, HI 2020S
HI 2031B, HI 2020S
HI 1413B, HI 1410S
HI 1230B, HI 1210S
HI 1043B, HI 1040S
HI 1043B, HI 1040S
HI 1130B, HI 1110S
HI 1413B, HI 1410S
H I1130B, HI 2114P/2
HI 1131B, HI 1111S
HI 1131B, HI 1111S
FC 911B
HI 1330B, HI 1310S
FC 220B
B = BNC-type connector
S = Screw-type connector
* All electrodes ending with "B" are supplied with 1 m (3.3') cable and BNC Connector
25
HI 4430B / HI 4410S
Plastic body, gel-filled, combination gold ORP electrode.
Use: general purpose.
SPECIFICATIONS
12 mm
0.5"
HI 4430
120 mm
4.7"
"S" VERSION
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 THE
BNC SOCKET
OF THE METER
CONNECT TO
SCREW TYPE
ELECTRODES
HI 7855/1
HI 7855/3
HI 7855/5
HI 7855/10
HI 7855/15
Extension cable 1 m (3.3') long
Extension cable 3 m (9.9') long
Extension cable 5 m (16.5') long
Extension cable 10 m (33') long
Extension cable 15 m (49.5') long
OTHER ACCESSORIES
HI 98501 ChecktempC pocket-size thermometer (–50.0 to 150.0°C)
HI 98502 ChecktempF 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
24
-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.)
Range
5
OPERATIONAL 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.
FC 220B
Glass body, triple ceramic, single junction, refillable, combination pH electrode.
Use: food processing.
9.5mm DIA
0.37"
12 mm
0.5"
FC 220
120 mm
4.7"
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"
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.
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
5.9"
"S" VERSION
HI 3230B / HI 3210S
Plastic body, gel-filled, combination platinum ORP electrode.
Use: general purpose.
12 mm
0.5"
HI 3230
120 mm
4.7"
"S" VERSION
6
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
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.
75 mm
2.95"
"S" VERSION
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"
• 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).
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"
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.
FC 210
120 mm
4.7"
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.
HI 1083B
Glass body, micro, Viscolene, non-refillable, combination pH electrode.
Use: biotechnology, micro titration.
12 mm
0.5"
5 mm
0.2"
3 mm
0.12"
3.0 mm DIA
0.12"
HI 1083
120 mm
4.7"
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 1131B / HI 1111S
Glass body, single junction, refillable, combination pH electrode.
Use: general purpose.
9.5mm DIA
0.37"
12 mm
0.5"
HI 1131
120 mm
4.7"
"S" VERSION
HI 1230B / HI 1210S
Plastic body, double junction, gel-filled, combination pH electrode.
Use: general purpose.
12 mm
0.5"
HI 1230
"S" VERSION
120 mm
4.7"
HI 1330B / HI 1310S
Glass body, semimicro, single junction, refillable, combination pH electrode.
Use: laboratory.
5mm DIA
0.2"
5mm
0.2"
HI 1330
120 mm
4.7"
"S" VERSION
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
210 mm
8.25"
"S" VERSION
8
21
HI 7082
HI 8082
HI 8093
3.5 M KCl electrolyte solution, 4 x 30 mL bottle, for double
junction electrodes
3.5 M KCl electrolyte solution, 4 x 30 mL FDA bottle, for double
junction electrodes
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.
9.5mm DIA
0.37"
12 mm
0.5"
HI 1043
120 mm
4.7"
"S" VERSION
HI 1053B / HI 1050S
Glass body, triple ceramic, conic shape, refillable, combination pH electrode.
Use: emulsions.
p H 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.
12 mm
0.5"
HI 1053
• The meter expects a pH 7.01 buffer.
120 mm
4.7"
"S" VERSION
20
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.
ACCESSORIES
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.
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
10
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.
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:
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
Soak in HI 7061 general cleaning solution for approxi• General
mately 30 minutes.
• Protein
Soak in HI 7073 protein cleaning solution for 15 min.
• Inorganic
Soak in HI 7074 inorganic cleaning solution for 15
minutes.
• Oil/grease
Rinse with HI 7077 Oil & Fat cleaning solution for 1
minute.
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.
18
• 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.
• Follow the pH calibration procedure explained in the previous pages.
p H 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
°C °F
0
32
5
41
10 50
15 59
20 68
25 77
30 86
35 95
40 104
45 113
50 122
55 131
60 140
65 149
70 158
75 167
80 176
85 185
90 194
95 203
4.01
4.01
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.05
4.06
4.07
4.09
4.11
4.12
4.14
4.16
4.17
4.19
4.20
11
pH VALUES
7.01
7.13
7.10
7.07
7.04
7.03
7.01
7.00
6.99
6.98
6.98
6.98
6.98
6.98
6.99
6.99
7.00
7.01
7.02
7.03
7.04
10.01
10.32
10.24
10.18
10.12
10.06
10.01
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
MENU SELECTION
ELECTRODE CONDITIONING & MAINTENANCE
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.
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
m V CALIBRATION
Symptom
Slow reponse or
excessive drift
Problem
Dirty pH electrode
Reading fluctuates
up and down (noise)
Clogged/dirty junction
or low electrolyte level
(refillable electrodes)
Blinking full scale
value
Blinking "°C" (or "°F")
"WRONG" &
blinking dashes
Blinking battery
symbol
Meter shuts off
"Clr" message
"Er1" and Er2"
messages
Solution
Soak the electrode tip
in HI 7061 solution for
30 minutes
Soak the electrode tip
in warm HI 7082
solution for one hour,
then rinse it with
distilled water
(refill with fresh
electrolyte if necessary)
Reading is out of range
Temperature probe is not connected or broken
Calibration error
Check buffer solution or
replace pH electrode
Low battery level
Recharge or
replace battery
Auto-off enabled or
dead battery
Replace battery
Loaded default
Perform pH calibration
pH calibration values
EPROM error
Contact your dealer or
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 CALIBRATION
HI 8424NEW 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 instruments® Customer Service
Center for more information.
Note: For field applications, it is always recommended to keep a conditioned spare electrode handy. When anomalies cannot be resolved with simple maintenance, change
the electrode and recalibrate the meter.
16
13
BATTERY RECHARGE AND REPLACEMENT
LCD 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 off.
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.
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%
It will take approx. 14 hours to completely charge the battery.
The supplied 9V Ni-MH rechargeable 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.
14
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