Hanna Instruments Work Light Hi 9124 Users Manual Man9125r2_27_02_2008_booklet.pmd

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Instruction Manual

HI 9124 HI 9125

Portable Waterproof

pH Meters

www.hannainst.com

SALES AND TECHNICAL SERVICE CONTACTS

Australia:

Tel. (03) 9769.0666 • Fax (03) 9769.0699

China:

Tel. (10) 88570068 • Fax (10) 88570060

Egypt:

Tel. & Fax (02) 2758.683

Germany:

Tel. (07851) 9129-0 • Fax (07851) 9129-99

Greece:

Tel. (210) 823.5192 • Fax (210) 884.0210

Indonesia:

Tel. (21) 4584.2941 • Fax (21) 4584.2942

Japan:

Tel. (03) 3258.9565 • Fax (03) 3258.9567

Korea:

Tel. (02) 2278.5147 • Fax (02) 2264.1729

Malaysia:

Tel. (603) 5638.9940 • Fax (603) 5638.9829

Singapore:

Tel. 6296.7118 • Fax 6291.6906

South Africa:

Tel. (011) 615.6076 • Fax (011) 615.8582

Taiwan:

Tel. 886.2.2739.3014 • Fax 886.2.2739.2983

Thailand:

Tel. (662) 619.0708.11 • Fax (662) 619.0061

United Kingdom:

Tel. (01525) 850.855 • Fax (01525) 853.668

USA:

Tel. (401) 765.7500 • Fax (401) 765.7575

For e-mail contacts and a complete list of Sales and

Technical offices, please see www.hannainst.com

MAN9125R2

02/08

WARRANTY

Dear Customer,

Thank you for choosing a Hanna Instruments product.

Please read this instruction manual carefully before using the instruments.

This manual will provide you with the necessary information for correct

use of the instruments, as well as a precise idea of their versatility.

If you need additional technical information, do not hesitate to e-mail

us at tech@hannainst.com or turn to the back cover for our

worldwide contact list.

These instruments are in compliance with directives.

WARRANTYWARRANTY

WARRANTY

HI 9124 & HI 9125 are guaranteed for two years against defects in

workmanship and materials when used for their intended purpose

and maintained according to instructions. Electrodes and probes are

guaranteed for six months. This warranty is limited to repair or

replacement free of charge.

Damage due to accidents, misuse, tampering or lack of prescribed

maintenance is not covered.

If service is required, contact the dealer from whom you purchased the

instruments. If under warranty, report the model number, date of

purchase, serial number and the nature of the problem. If the repair

is not covered by the warranty, you will be notified of the charges

incurred. If the instruments are to be returned to Hanna Instru-

ments, 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

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

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

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

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

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

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

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

pH BUFFER TEMPERATURE DEPENDENCE ....................................... 12

SETUP MENU ............................................................................. 13

mV CALIBRATION (HI 9125 only) ................................................ 14

TEMPERATURE CALIBRATION ....................................................... 14

BATTERY REPLACEMENT ............................................................... 14

LCD MESSAGE GUIDE .................................................................. 17

TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS................ 18

ELECTRODE CONDITIONING & MAINTENANCE ................................ 19

TROUBLESHOOTING GUIDE ......................................................... 21

ACCESSORIES ............................................................................. 22

Hanna Instruments reserves the right to modify the design,

construction and appearance of its products without advance notice.

RECOMMENDATIONS FOR USERS

Before using these products, make sure they are entirely suitable for

the environment in which they are used.

Operation of these instruments 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 instruments’ EMC performance.

To avoid electrical shock, do not use these instruments 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.

GENERAL DESCRIPTION

The HI 9124 and HI 9125 are state-of-the-art waterproof, heavy-

duty pH meters designed to provide laboratory results and accuracy

under harsh industrial conditions.

A large dual-level LCD, with clear indications related to the electrode

and instrument status, pH and temperature displayed simultaneously,

and user friendly graphic symbols during calibration.

The pH calibration procedure is automatic with 5 memorized buffers

(4.01, 6.86, 7.01, 9.18 and 10.01), buffer recognition and

automatic temperature compensation.

The HI 9125 can be used with ORP (Oxidation Reduction Potential)

electrodes. mV measurements automatically change from 0.1 to 1 mV

resolution when the reading reaches 700 mV.

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

PRELIMINARY EXAMINATION

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

Remove the instrument from the packing material and examine it to

make sure that no damage has occurred during shipping.

If there is any damage, notify your dealer or the nearest Hanna

Customer Service Center.

Each meter is supplied with:

•HI 1230B combination double-junction, gel pH electrode

•HI 7662 stainless steel temperature probe with 1 m (3.3’’) cable

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

•100 mL plastic beaker

•4 x 1.2 AAA rechargeable batteries (inside the instrument)

•HI 710044 inductive recharger with power adapter

• Instruction manual

• Rugged carrying case

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

functions correctly. All defective items must be returned in the

original packing with the supplied accessories.

OTHER ACCESSORIES

HI 710044 Inductive recharger

HI 721317 Rugged carrying case

HI 740157 Plastic electrode refilling pipet (20 pcs)

HI 76405 Electrode holder

HI 7662 Temperature probe with 1 m (3.3') screened cable

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

coaxial cable ending in female BNC connectors

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

(3.3') coaxial cable ending in female BNC connectors

HI 1413B

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

pH electrode. Use: surface measurement.

ORP ELECTRODES

HI 3131B

Glass-body, refillable, combination platinum ORP electrode.

Use: titration.

HI 3230B

Plastic-body (PEI), gel-filled, combination platinum ORP electrode.

Use: general purpose.

HI 4430B

Plastic-body (PEI), gel-filled, combination gold ORP electrode.

Use: general purpose.

Consult the Hanna General Catalog for a complete and wide selection

of electrodes.

110 mm

4.3"

12 mm

0.5"

HI 1413

150 mm

5.9"

12 mm

0.5"

"S" VERSION

HI 3131

120 mm

4.7"

12 mm

0.5"

HI 3230

"S" VERSION

120 mm

4.7"

12 mm

0.5"

HI 4430

"S" VERSION

1) Temperature probe socket.

2) BNC electrode connector.

3) Liquid Crystal Display (LCD).

4) RANGE key, to select pH or mV (HI 9125 only).

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

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

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

8) MR key, to recall stored value from memory.

9) MEM key, to store reading in memory.

10) S and T keys, for manual temperature setting, or selecting pH

buffer value.

11) Secondary display.

12) Primary display.

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

120 mm

4.7"

12 mm

0.5"

FC 100

75 mm

2.95"

6 mm

0.25"

FC 200

120 mm

4.7"

12 mm

0.5"

FC 210

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

FC 220

110 mm

4.3"

12 mm

0.5"

FC 911

FC 100B

Plastic-body (PVDF), double junction, refillable, combination pH elec-

trode.

Use: general purpose for food industry.

FC 200B

Plastic-body (PVDF), open junction, conic, Viscolene, non-refillable,

combination pH electrode. Use: meat & cheese.

FC 210B

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

pH electrode.

Use: milk, yogurt.

FC 220B

Glass-body, triple-ceramic, single junction, refillable, combination pH

electrode. Use: food processing.

FC 911B

Plastic-body (PVDF), double junction, refillable with built-in amplifier,

combination pH electrode. Use: very high humidity.

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

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HI 1330B

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

Use: laboratory, vials.

HI 1331B

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

Use: flasks.

HI 1230B

Plastic-body (PEI), double junction, gel-filled, combination pH elec-

trode.

Use: general, field.

HI 2031B

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

Use: semisolid products.

HI 1332B

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

Use: general purpose.

120 mm

4.7"

5mm

0.2"

5mm DIA

0.2"

"S" VERSION

HI 1330

120 mm

4.7"

12 mm

0.5"

VERSION

HI 1230

75 mm

6 mm

0.25"

VERSION

HI 2031

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1332

210 mm

8.25"

8 mm

0.3" 7.5mm DIA

0.29"

"S" VERSION

HI 1331

INITIAL PREPARATION

The meter is supplied with rechargeable batteries (located inside the

meter - see page 14 for details).

To prepare the instrument for use, connect the pH electrode and the

temperature probe to the BNC and temperature sockets on the top of

the instrument. The temperature probe can be used independently to

take temperature measurements, or it can be used in conjunction

with the pH electrode to utilize Automatic Temperature Compensation

(ATC) mode. If the probe is disconnected, temperature can also be set

manually with the UP and DOWN arrow keys.

Turn the instrument ON by pressing ON/OFF.

At start-up the display will show the battery percentage and then all

LCD segments while the instrument performs a self check (or as long as

the button is held).

The meter automatically enters measurement mode.

After measurement switch the meter off. Clean the electrode and store

it with a few drops of HI 70300 storage solution in the protective cap.

To save batteries, the auto-off feature turns the meter off after 20

minutes with no button pressed. To disable this feature, see “Setup

Menu” section on page 13.

pH MEASUREMENTS

To take a pH measurement remove the electrode

protective cap and submerge the electrode and

the temperature probe 4cm (1½") into the

sample and stir gently.

If necessary, press the RANGE key until the display

shows pH mode (HI 9125 only).

Allow time for the reading to stabilize.

OPERATIONAL GUIDEOPERATIONAL GUIDE

OPERATIONAL GUIDE

pH ELECTRODES

All electrodes part numbers ending in B are supplied with a BNC

connector and 1 m (3.3') cable, as shown below:

HI 1043B

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

Use: strong acid/alkali.

HI 1053B

Glass-body, triple ceramic, conic shape, refillable, combination pH

electrode.

Use: emulsions.

HI 1083B

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

Use: biotechnology, micro titration.

HI 1131B

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

Use: general purpose.

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

"S" VERSION

HI 1043

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1053

120 mm

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

The LCD will show the pH measurement and the temperature of the

sample.

In order to take more accurate pH measurements, make sure that the

instrument is calibrated (see page 9 for details).

The glass bulb and the junction on the pH electrode should always be

moist, never allow it to dry out.

If several measurements are taken successively in different samples,

rinse the electrode thoroughly with deionized or tap water and a

small amount of the sample to be measured.

The pH reading is directly affected by temperature. In order for the meter to

measure the pH accurately, temperature must be compensated for. If the

sample temperature is different from the temperature at which the pH

electrode was kept, allow a few minutes for thermal equilibrium.

To use the meter's Automatic Temperature Compensation feature,

submerge the temperature probe into the sample as close to the

electrode as possible and wait for a few minutes.

If manual temperature compensation is desired the temperature

probe must be disconnected from the instrument.

The display will show the default temperature of 25 °C, or the last

temperature set with the "°C" (or "°F") indicator blinking.

The temperature can now be adjusted with the UP and DOWN arrow keys.

ORP MEASUREMENTS (HI 9125 only)

To perform ORP measurements, connect an optional ORP electrode

(see "Accessories" section) to the meter and turn it ON.

If necessary, enter the "mV" mode by pressing RANGE until the

display changes to mV.

ACCESSORIESACCESSORIES

ACCESSORIES

pH CALIBRATION SOLUTIONS

HI 70004P pH 4.01 Buffer Solution, 20 mL sachet, 25 pcs

HI 70007P pH 7.01 Buffer Solution, 20 mL sachet, 25 pcs

HI 70010P pH 10.01 Buffer Solution, 20 mL sachet, 25 pcs

HI 7004L pH 4.01 Buffer Solution, 500 mL bottle

HI 7004M pH 4.01 Buffer Solution, 230 mL bottle

HI 7006L pH 6.86 Buffer Solution, 500 mL bottle

HI 7006M pH 6.86 Buffer Solution, 230 mL bottle

HI 7007M pH 7.01 Buffer Solution, 500 mL bottle

HI 7007M pH 7.01 Buffer Solution, 230 mL bottle

HI 7009L pH 9.18 Buffer Solution, 500 mL bottle

HI 7009M pH 9.18 Buffer Solution, 230 mL bottle

HI 7010L pH 10.01 Buffer Solution, 500 mL bottle

HI 7010M pH 10.01 Buffer Solution, 230 mL bottle

ELECTRODE STORAGE SOLUTION

HI 70300L Storage Solution, 460 mL bottle

HI 70300M Storage Solution, 230 mL bottle

ELECTRODE CLEANING SOLUTIONS

HI 70000P Electrode Rinse Solution, 20 mL sachet, 25 pcs

HI 7061L General Cleaning Solution, 460 mL bottle

HI 7061M General Cleaning Solution, 230 mL bottle

HI 7073L Protein Cleaning Solution, 460 mL bottle

HI 7073M Protein Cleaning Solution, 230 mL bottle

HI 7074L Inorganic Cleaning Solution, 460 mL bottle

HI 7074M Inorganic Cleaning Solution, 230 mL bottle

HI 7077L Oil & Fat Cleaning Solution, 460 mL bottle

HI 7077M Oil & Fat Cleaning Solution, 230 mL bottle

REFILLING ELECTROLYTE SOLUTIONS (50 mL, 4 pcs)

HI 7071 3.5M KCl+AgCl Electrolyte for single junction electrodes

HI 7072 1M KNO3 Electrolyte

HI 7082 3.5M KCl Electrolyte for double junction electrodes

HI 8093 1M KCl+AgCl Electrolyte

ORP PRETREATMENT SOLUTIONS

HI 7091L Reducing Pretreatment Solution, 460 mL bottle

HI 7091M Reducing Pretreatment Solution, 230 mL bottle

HI 7092L Oxidizing Pretreatment Solution, 460 mL bottle

HI 7092M Oxidizing Pretreatment Solution, 230 mL bottle

ORP SOLUTIONS

HI 7020L Test Solution 200-275 mV, 500 mL bottle

HI 7020M Test Solution 200-275 mV, 230 mL bottle

HI 7021L Test Solution 240 mV, 500 mL bottle

HI 7021M Test Solution 240 mV, 230 mL bottle

HI 7022L Test Solution 470 mV, 500 mL bottle

HI 7022M Test Solution 470 mV, 230 mL bottle

Submerge the ORP electrode 4cm (1½") into the sample to be tested

and wait a few minutes for the reading to stabilize.

Measurements within the ±699.9 mV range are displayed with 0.1

mV resolution, while outside this range the resolution automatically

switches to 1 mV.

For accurate ORP measurements, the surface of the electrode must be

clean and smooth. Pretreatment solutions are available to condition

the electrode and improve its response time (see "Accessories" section).

Notes:

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

full-scale value.

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

the mV generated by the pH electrode.

MEM & MR FUNCTIONS

The instrument allows the user to store the current measurement (pH

and temperature, or mV and temperature) into internal memory by

pressing the MEM key. The MEMORIZE tag lights up on display.

Stored value can be recalled by pressing MR: the display will show

the value as long as the button is pressed, and the MEMORIZE

tag.

TROUBLESHOOTING GUIDETROUBLESHOOTING GUIDE

TROUBLESHOOTING GUIDE

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It is recommended to calibrate the instrument frequently, especially if

high accuracy is required.

The pH range should be recalibrated:

• Whenever the pH electrode or temperature probe is replaced.

• At least once a week.

• After testing aggressive chemicals.

• When extreme accuracy is required.

PREPARATION

Pour a small quantity of buffer solution into clean beakers. For

accurate calibration use two beakers for each buffer solution, the first

one for rinsing the electrode and the second one for calibration.

PROCEDURE

In order to perform pH calibration:

• Make sure that the meter is in the pH mode (HI 9125 only).

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

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

There is a choice of 5 memorized buffers: 4.01, 6.86, 7.01, 9.18 and

10.01 pH.

TWO-POINT CALIBRATION

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

displayed. The secondary LCD will display buffer "7.01". If a

different calibration buffer is desired (e.g. “6.86”), use the UP

and DOWN arrow keys to change the displayed value.

• Submerge the electrode approx. 4 cm (1½") into the solution,

place the temperature probe as close as possible to the electrode

and stir gently.

pH CALIBRATIONH CALIBRATION

H CALIBRATIONH CALIBRATION

H CALIBRATION

For refillable electrodes, if the refill solution (electrolyte) is more than 2½

cm (1") below the fill hole, add the appropriate Electrolyte Solution.

MEASUREMENT

Rinse the electrode tip with distilled water, immerse it 4 cm (1½") in

the sample and stir gently for a few seconds.

For a faster response and to avoid cross contamination of the samples,

rinse the electrode tip with the solution to be tested, before taking

any measurements.

STORAGE PROCEDURE

To minimize clogging and ensure a quick response time, the glass

bulb and the junction should always be kept moist.

When not in use, store it with a few drops of HI 70300 storage

solution in the protective cap.

NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED

WATER.

PERIODIC MAINTENANCE

Inspect electrode and cable. The cable must be intact. No cracks

should be seen 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 Hanna HI 7061 General Cleaning

Solution for approximately ½ hour.

•

Protein

Soak in Hanna HI 7073 Protein Cleaning

Solution for 15 min.

•

Inorganic

Soak in Hanna HI 7074 Inorganic

CleaningSolution for 15 min.

•

Oil/grease

Rinse with Hanna HI 7077 Oil & Fat Cleaning

Solution for 1 min.

IMPORTANT: After performing any of the cleaning procedures, rinse

the electrode thoroughly with distilled water and soak it in HI 70300

Storage Solution for at least 1 hour before taking measurements.

• The LCD will flash the "WAIT NOT READY" message.

• Once the reading is stable, if it is not close to the selected buffer,

"WRONG " and "WRONG " will blink alternatively; if it is close

to the selected buffer the display will change to "READY" and

blinking "CFM".

• Press the CFM key to confirm the calibration: the meter stores the

offset calibration point. The calibrated reading is then displayed on the

primary LCD while the secondary LCD will show the second buffer to be

used for calibration (pH 4.01).

• After the first calibration point is confirmed, immerse the electrode

into the second buffer (pH 4.01, 10.01 or 9.18) and stir gently.

Choose pH 4.01 for acidic samples, and pH 10.01 or 9.18 for

alkaline solutions.

• Submerge the electrode approx. 4 cm (1½") into the solution,

place the temperature probe as close as possible to the electrode

and stir gently.

• Select the second buffer value on the secondary display by

pressing the UP and DOWN arrow keys.

ELECTRODE CONDITIONING & MAINTENANCELECTRODE CONDITIONING & MAINTENANCE

LECTRODE CONDITIONING & MAINTENANCELECTRODE CONDITIONING & MAINTENANCE

LECTRODE 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.

Not present in gel electrodes.

• If the reading is not close to the selected buffer, "WRONG "

and "WRONG " will blink alternatively;

• If the reading is close to the selected buffer and the reading is

stable, the “READY” symbol is displayed and the “CFM” symbol

starts blinking on the LCD, asking for confirmation.

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

returns to normal mode.

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

calibration point to avoid erroneous procedure. A difference of at

least 1.5 pH unit is required between the two buffers used for

the offset and slope calibration: once calibrated at either pH

7.01 or 6.86, the instrument automatically ignores the other

value for the second point (same for pH 10.01 and 9.18).

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

value. For the HI 9125 model, it is possible to display the

buffer temperature during calibration by pressing RANGE.

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

press CFM, then CAL after entering the calibration mode and

before the first buffer is accepted. The LCD will show “CLr CAL” for

one second, and then will return to normal mode.

ONE-POINT CALIBRATION

For optimum accuracy it is always recommended to perform a two-point

calibration, but for a faster operation a single-point calibration can be

used. pH 7.01 or pH 6.86 (NIST) are normally used for this purpose,

even though the meters can be calibrated with any of the 5 memorized

calibration values.

After calibrating the first point (see above), press the CAL key to end

the calibration procedure.

Typical Electrode Life

Ambient Temperature 1 – 3 years

90 °C Less than 4 months

120 °C Less than 1 month

Alkaline Error

High concentrations of sodium ions interfere with readings in alkaline

solutions. The pH at which the interference starts to be significant

depends upon the composition of the glass. This interference is called

alkaline error and causes the pH to be underestimated. Hanna’s glass

formulations have the indicated characteristics.

1.0 Mol L-1 Na+

0.1 Mol L-1 Na+

Sodium Ion Correction for Glass at 20-25 °C

Concentration pH Error

13.00

13.50

14.00

12.50

13.00

13.50

14.00

0.10

0.14

0.20

0.10

0.18

0.29

0.40

The resistance of glass electrodes partially depends on the temperature.

The lower the temperature, the higher the resistance. It takes more time

for the reading to stabilize if the resistance is higher. In addition, the

response time will suffer to a greater degree at temperatures below 25 °C.

Since the resistance of the pH electrode is in the range of 50 – 200

Mohms, the current across the membrane is in the pico Ampere range.

Large currents can disturb the calibration of the electrode for many

hours.

For these reasons high humidity environments, short circuits and static

discharges can be detrimental to a stable pH reading.

The pH electrode’s life also depends on the temperature. If constantly

used at high temperatures, the electrode life is drastically reduced.

TEMPERATURE CORRELATIONTEMPERATURE CORRELATION

TEMPERATURE CORRELATION

FOR FOR

FOR pp

pH SENSITIVE GLASSH SENSITIVE GLASS

H SENSITIVE GLASSH SENSITIVE GLASS

H SENSITIVE GLASS

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.

pH BUFFER TEMPERATUREH BUFFER TEMPERATURE

H BUFFER TEMPERATUREH BUFFER TEMPERATURE

H BUFFER TEMPERATURE

DEPENDENCEDEPENDENCE

DEPENDENCE

PMETSREFFUBHp

CºFº10.468.610.781.910.01

02310.489.631.764.923.01

51400.459.601.793.942.01

010500.429.670.733.981.01

519500.409.650.772.921.01

028600.488.630.722.960.01

527710.468.610.781.910.01

036820.458.600.741.969.9

535930.448.699.611.929.9

04401 40.448.689.670.988.9

54311 50.438.689.640.958.9

05221 60.438.689.610.928.9

55131 80.448.689.699.897.9

06041 90.448.689.679.877.9

56941 11.448.699.659.867.9

07851 21.458.699.639.857.9

57761 41.468.600.719.847.9

08671 61.478.610.798.847.9

58581 71.478.620.778.847.9

09491 91.488.630.758.857.9

59302 02.498.640.738.867.9

mode tags

battery

symbol

calibration

messages

first or second

calibration point

temperature reading

or pH buffer value

pH or mV

measurement

available keys

in accordance with

the selected mode

TAGS & SYMBOLS

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

and blink for warning the user.

MEASURE on: measurement mode.

CALIBRATION on: calibration mode has been entered.

MEMORIZE on: measurement stored in the internal memory and

frozen on the display

RECALL MEMORIZED on: stored value recalled.

•Battery symbol blinking: low battery condition. Batteries should

be recharged.

•Calibration messages.

WAIT NOT READY blinking: buffer has been recognized, but

reading is not stable.

READY on: buffer has been recognized and reading is stable.

WRONG and WRONG blinking alternatively: wrong

buffer, value not recognized.

LCD MESSAGE GUIDELCD MESSAGE GUIDE

LCD MESSAGE GUIDE

The instrument allows the user to configure several parameters

through the Setup Menu.

To enter the Menu mode, while in measurement mode, press and

hold the SETUP key for about 5 seconds.

Once the menu is entered, each parameter can be changed by using

the arrow keys; then pressing the CFM key will confirm the value and

scroll to the next parameter.

1. Acoustic signal: On (default) or Off

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

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

After setting the last parameter, pressing the CFM key will confirm the

value and return to measurement mode.

SETUP MENUSETUP MENU

SETUP MENU

WHEN ALKALINE

ARE USED!

IN ALK POSITION

PUT THE SWITCH

WARNING!!!

Ni-MH ALK

Replace the rechargeable batteries only if necessary. To replace the

rechargeable batteries, follow the next steps:

• Turn OFF the instrument.

• Unscrew the screws from the bottom sides of the instrument.

• Insert four new 1.2V AAA 1000

mAh NiMH rechargeable batteries

in the battery compartment while

paying attention to the correct po-

larity. Make sure that the “Battery

type” switch is in NiMH position.

WARNING:

Do not replace the rechargeable batteries

with normal alkaline batteries.

Never place an instrument with alka-

line batteries on the recharger.

The manufacturer will not assume any

obligation for malfunctioning appeared

as a result of using alkaline batteries.

If for any reason it is necessary to use

alkaline batteries, set the “Battery

type” selection switch in the proper

position, ALK.

BATTERIESBATTERIES

BATTERIES

RECHARCHING/REPLACEMENTRECHARCHING/REPLACEMENT

RECHARCHING/REPLACEMENT

The instrument is supplied with rechargeable batteries inside.

First time you start working with the instrument or when the rechargeable

batteries are changed with new ones, perform the following procedure:

• Work with the instrument until the rechargeable batteries are

fully discharged

• Perform a complete charging cycle (about 16 hours).

Repeat this procedure 3 times.

At start-up the battery percentage is displayed.

If the batteries become weak, the display will flash the battery symbol to

advise the user that there are approximately 25 hours of working time left.

HI 9124 & HI 9125 have been precalibrated for temperature at the

factory.

For optimum accuracy, it is recommended to recalibrate the meter for

temperature at least once a year. Contact your Dealer or the nearest

Hanna Customer Service Center for more information.

HI 9125 has been precalibrated for mV range at the factory.

For optimum accuracy, it is recommended to recalibrate the meter for

mV readings at least once a year. Contact your Dealer or the nearest

Hanna Customer Service Center for more information.

mV CALIBRATION (HI 9125 V CALIBRATION (HI 9125

V CALIBRATION (HI 9125 V CALIBRATION (HI 9125

V CALIBRATION (HI 9125 onlyonly

onlyonly

only))

))

)

TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION

TEMPERATURE CALIBRATION

It is recommended to recharge the rechargeable batteries as soon as

the display will flash the battery symbol.

The meter is also provided with the BEPS (Battery Error Prevention System)

feature which automatically turns the instrument off when the battery level

is too low to ensure reliable readings. At start-up the display will show “0

batt” for few seconds, then the meter automatically turns off.

To recharge the rechargeable batteries, follow the next steps:

• Connect the 12VDC power adapter to the main line and to the main

line of the battery recharger. The recharger front LED will turn ON.

• Place the instrument in the battery recharger case.

• The complete charging process takes about 16 hours.

• The Changing LED is ON until the changing process is completed.

Notes: • As the charging process is performed at low current, the

instrument can be left on the recharger more than 16

hours, without damaging the rechargeable batteries.

• It is recommended to turn off the instrument while

recharging the batteries. The measurements can be af-

fected by the recharging process.

• Batteries recharging must only take place in a non hazard-

ous area, using the HI 710044 inductive recharger.

Hanna Instruments Work Light Hi 9124 Users Manual Man9125r2_27_02_2008_booklet.pmd

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