Hanna instruments Hi 8424 User manual

Instruction Manual

HI 8424

Portable pH/mV/°C Meter

MAN8424W R2 09/10

Printed in EUROPE

(ROMANIA)

Hanna Instruments Inc.

Local Sales and Customer Service Office

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

[email protected][email protected]

[email protected] or see the back cover for our worldwide contact list.

WARRANTYWARRANTY

WARRANTY

HI 8424 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 instru-

ment. 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

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 REPLACEMENT ............................................................................. 14

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

ELECTRODE CONDITIONING & MAINTENANCE .............................................. 17

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

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

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.

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 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.

HI 8424 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 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 the 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

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

PRELIMINARY EXAMINATION

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.

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

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

pH ELECTRODE APPLICATIONH ELECTRODE APPLICATION

H ELECTRODE APPLICATIONH ELECTRODE APPLICATION

H ELECTRODE APPLICATION

REFERENCE GUIDEREFERENCE GUIDE

REFERENCE GUIDE

B = BNC-type connector S = Screw-type connector

*Allelectrodesendingwith"B"aresuppliedwith1m(3.3')cableandBNCConnector

Application Electrodes *

1. Aquarium HI1332B, HI1312S

2. Bath-water HI1130B, HI1110S

3. Beer HI1131B, HI1111S

4. Bread HI2031B, FC200B, HI2020S, FC200S

5. Cheese FC200B, FC200S

6. Dairyproducts FC911B, FC100B

7. Dirtywater HI1230B, HI1210S

8. Emulsions HI1053B, HI1050S

9. Environment HI1230B, HI1210S

10. Flasks HI1331B, HI1310S

11. Foodindustrygeneraluse FC911B, FC100B

12. Fruit FC200B, FC220B, FC200S

13. Fruitjuices,organic FC210B

14. Galvanizing waste solution HI1130B, HI1110S

15. High purity water HI1053B, HI1050S

16. Horticulture HI1053B, FC200B, HI1050S, FC200S

17. Laboratorygeneraluse HI1131B, HI1230B, HI1332B, HI1330B

HI1111S, HI1210S, HI1312S, HI1310S

18. Leather HI1413B, HI1410S

19. Lemonjuice FC100B

20. Meat FC200B, HI2031B, FC200S, HI2020S

21. Micro plate sampling of less than HI1083B

100mL

22. Milk and Yogurt FC210B

23. Paints HI1053B, HI1050S

24. Paper HI1413B, HI1410S

25. Photographicchemicals HI1230B, HI1210S

26. Qualitycontrol HI1332B, HI1312S

27. Sausages FC200B, HI2031B, FC200S, HI2020S

28. Semi-solidproducts HI2031B, HI2020S

29. Skin HI1413B, HI1410S

30. Soilsamples HI1230B, HI1210S

31. Solvents HI1043B, HI1040S

32. Strongacid HI1043B, HI1040S

33. Submersionapplication HI1130B, HI1110S

34. Surfacemeasurements HI1413B, HI1410S

35. Swimmingpool HI1130B, HI2114P/2

36. Titrationswith constant HI1131B, HI1111S

temperaturerange

37. Titrationswithwide temperature HI1131B, HI1111S

range

38. Very high humidity FC911B

39. Vials and test tube HI1330B, HI1310S

40. Wineprocessing FC220B

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

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

Battery Life Approx. 150 hours of continuous use

Auto-off After 20 minutes of non-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.)

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 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

120 mm

4.7"

12 mm

0.5"

HI 4430

"S" VERSION

HI 4430B / HI 4410S

Plastic body, gel-filled, combination gold ORP electrode.

Use: general purpose.

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

electrodes.

EXTENSION CABLES FOR SCREW-TYPE ELECTRODES (SCREW

TO BNC CONNECTOR)

HI 7855/1 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

CONNECT TO

SCREW TYPE

ELECTRODES

CONNECT TO THE

BNC SOCKET

OF THE METER

HI 7855 SERIES CABLE CONNECTORS

CONNECTOR AND 3.0 mm (0.12") CABLE WITH BNC

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 tem-

perature 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 recom-

mended 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.

OPERATIONAL GUIDEOPERATIONAL GUIDE

OPERATIONAL GUIDE

ORP ELECTRODES

HI 3131B / HI 3111S

Glass body, refillable, combination platinum ORP electrode.

Use: titration.

HI 3230B / HI 3210S

Plastic body, gel-filled, combination platinum ORP electrode.

Use: general purpose.

110 mm

4.3"

12 mm

0.5"

HI 1413

150 mm

5.9"

12 mm

0.5"

"S" VERSION

HI 3131

120 mm

4.7"

12 mm

0.5"

HI 3230

"S" VERSION

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

FC 220

110 mm

4.3"

12 mm

0.5"

FC 911

FC 220B

Glass body, triple ceramic, single junction, refillable, combination pH electrode.

Use: food processing.

FC 911B

PVDF body, double junction, refillable with built-in amplifier, combination pH

electrode. Use: very high humidity.

HI 1413B

Glass body, single junction, flat tip, Viscolene, non-refillable combination pH

electrode. Use: surface measurement.

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 tempera-

ture 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.

HI 1332B / HI 1312S

Plastic body, double junction, refillable, combination pH electrode.

Use: general purpose.

HI 2031B / HI 2020S

Glass body, semimicro, conic, refillable, combination pH electrode.

Use: semisolid products.

75 mm

6 mm

0.25"

"S" VERSION

HI 2031

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1332

FC 100B

PVDF body, double junction, refillable, combination pH electrode.

Use: general purpose for food industry.

FC 200B / FC 200S

PVDF body, single junction, conic, Viscolene, non-refillable, combination pH

electrode. Use: meat & cheese.

FC 210B

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

electrode. Use: milk, yogurt.

120 mm

4.7"

12 mm

0.5"

FC 100

75 mm

2.95"

6 mm

0.25"

FC 200

120 mm

4.7"

12 mm

0.5"

FC 210

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 mea-

surement 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).

120 mm

4.7"

5mm

0.2"

5mm DIA

0.2"

"S" VERSION

HI 1330

210 mm

8.25"

8 mm

0.3" 7.5mm DIA

0.29"

"S" VERSION

HI 1331

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1230

HI 1083B

Glass body, micro, Viscolene, non-refillable, combination pH electrode.

Use: biotechnology, micro titration.

HI 1131B / HI 1111S

Glass body, single junction, refillable, combination pH electrode.

Use: general purpose.

HI 1230B / HI 1210S

Plastic body, double junction, gel-filled, combination pH electrode.

Use: general purpose.

HI 1330B / HI 1310S

Glass body, semimicro, single junction, refillable, combination pH electrode.

Use: laboratory.

HI 1331B / HI 1311S

Glass body, semimicro, single junction, refillable, combination pH electrode.

Use: flasks.

120 mm

4.7

12 mm

0.5" 5 mm

0.2" 3 mm

0.12" 3.0 mm DIA

0.12"

HI 1083

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

"S" VERSION

HI 1131

pH CALIBRATIONH CALIBRATION

H CALIBRATIONH CALIBRATION

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.

•The meter expects a pH 7.01 buffer.

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

HI 1043B / HI 1040S

Glass body, double junction, refillable, combination pH electrode.

Use: strong acid/alkali.

HI 1053B / HI 1050S

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

Use: emulsions.

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

S = SCREW-TYPE CONNECTOR

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

"S" VERSION

HI 1043

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1053

•When the buffer value is recognized and the

reading is stable, an acoustic signal (if en-

abled) 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 en-

abled) 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.

If the temperature probe is not connected and manual temperature compensa-

tion 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.

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

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 KNO3electrolyte solution, 4 x 30 mL bottle

ACCESSORIESACCESSORIES

ACCESSORIES

•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.

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 correspond-

ing to the measured or set temperature.

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

pH BUFFER TEMPERATURE DEPENDENCEH BUFFER TEMPERATURE DEPENDENCE

H BUFFER TEMPERATURE DEPENDENCEH BUFFER TEMPERATURE DEPENDENCE

H BUFFER TEMPERATURE DEPENDENCE

104

113

122

131

140

149

158

167

176

185

194

203

4.01

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

7.13

7.10

7.07

7.04

7.03

7.01

7.00

6.99

6.98

6.99

7.00

7.01

7.02

7.03

7.04

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

TEMP pH VALUES

°C °F 4.01 7.01 10.01

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: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

Soak in HI 7061 general cleaning solution for approxi-

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.

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.

MENU SELECTIONMENU SELECTION

MENU SELECTION

ELECTRODE CONDITIONING & MAINTENANCEELECTRODE CONDITIONING & MAINTENANCE

ELECTRODE CONDITIONING & MAINTENANCE

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.

Only for refillable electrodes; must be open while measuring.

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.

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.

mV CALIBRATIONV CALIBRATION

V CALIBRATIONV CALIBRATION

V CALIBRATION

TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION

TEMPERATURE CALIBRATION

TROUBLESHOOTING

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 Replace battery

symbol

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

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.

BATTERY REPLACEMENTBATTERY REPLACEMENT

BATTERY REPLACEMENT

The meter displays the remaining battery per-

centage 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. 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 alkaline battery.

LCD MESSAGES & TROUBLESHOOTINGLCD MESSAGES & TROUBLESHOOTING

LCD MESSAGES & TROUBLESHOOTING

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%

Other manuals for HI 8424

Table of contents

Hanna Instruments HI 8424 User manual