Hanna Instruments PH 21 Manual de usuario

pH20 • pH21

Basic pH meters

Instruction Manual

www.hannainst.com

pH 20 and pH 21 are basic pH meters designed for simplicity of use in

all applications where rapid daily controls are required.

These meters are also suitable for educational field, where students begin

to approach pH measurements.

Both models measure pH in the 0 to 14 range, with 0.01 resolution.

In addition, pH 21 can also measure ORP (mV) by using a proper ORP

electrode (optional).

The pH calibration procedure is automatic and can be performed at

1 or 2 points.

Readings can be manually (MTC) or automatically (ATC) compensated

for temperature variations.

The automatic temperature compensation is performed if using the

optional HI 7662 temperature probe, while for manual compensation

the user can set the temperature value through the arrow keys.

The meters are also provided with the Hold function, which allows to

freeze reading on the LCD by simply pressing the HOLD button.

GENERAL DESCRIPTION

PRELIMINARY EXAMINATION

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.

Each meter is supplied complete with:

• HI 1110B pH electrode with BNC connector and 1 m cable

• 12 Vdc adapter

• instruction manual

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

ment functions correctly. All defective items must be returned in

the original packing with the supplied accessories.

Dear Customer,

Thank you for choosing a Hanna Instruments Product.

Please read this instruction manual carefully before using the instru-

ment. This manual will provide you with all the necessary information

for the correct use of the instrument, as well as a precise idea of its

versatility in a wide range of applications.

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

us at [email protected]

These instruments are in compliance with the directives.

TABLE OF CONTENTS

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

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

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

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

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

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

ELECTRODE CONDITIONING AND MAINTENANCE ........................................ 11

ACCESSORIES ................................................................................. 13

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

appearance of its products without advance notice.

WARRANTY

All Hanna Instruments meters are warranted for two years

against defects in workmanship and materials when used for their

intended purpose and maintained according to instructions. The

electrodes and the probes are warranted for six months. This

warranty is limited to repair or replacement free of charge. Damages

due to accident, misuse, tampering or lack of prescribed mainte-

nance are 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 failure. If the repair is not covered by the warranty, you will be

notified of the charges incurred. If the instrument is to be returned

to Hanna Instruments, first obtain a Returned Goods Authorization

number from the Customer Service department and then send it

with shipping costs prepaid. When shipping any instrument, make

sure it is properly packaged for complete protection.

SPECIFICATIONS

FUNCTIONAL DESCRIPTION

1. Liquid Crystal Display

2. CAL key, to enter and exit the calibration mode

3. CFM key, to confirm calibration values

4. ↑↑

↑↑

↑°C and ↓↓

↓↓

↓°C keys, to manually set temperature value for

compensation

5. HOLD key, to freeze reading on display

6. RANGE key, to select measurement range

7. ON/OFF key, to turn the meter on and off

Note: These instruments use the following configuration.

It is recommended to use the Hanna HI 710005 or HI 710006

voltage adapters (supplied with the meter) which are provided with

the proper polarity configuration.

The meters can also be powered with other adapters. In this case,

remember to check the correct polarity of the adapter before connect-

ing it to the meter.

REAR PANEL

1. BNC connector for pH or ORP (pH 21 only) electrode.

2. Temperature probe socket for use with the HI 7662.

3. Power supply input. Plug the 12 Vdc adapter into the DC socket,

then into the mains.

Notes:

• Make sure the mains line is protected by a fuse.

• If the instrument needs to be unplugged, press the ON/OFF

key before disconnecting it from the mains.

Range pH 0.00 to 14.00

ORP ±1999 mV (pH 21 only)

°C 0.0 to 100.0

Resolution pH 0.01

ORP 1 mV (pH 21 only)

°C 0.1

Accuracy pH ±0.02

(@20°C/68°F) ORP ±2 mV (pH 21 only)

°C ±1

pH Calibration Automatic, 1 or 2 point

Temperature Automatic (with temperature probe) or

Compensation manual (adjustable with arrow keys)

pH Electrode HI 1110B combination pH electrode

with BNC and 1 m cable (included)

Temperature probe HI 7662 (optional)

Power supply 12 Vdc adapter (included)

Environment 0 to 50°C (32 to 122°F)

RH max 95% non-condensing

Dimensions 230 x 170 x 75 mm (9.1x6.7x 3")

Weight 500 g (1.1 lb.)

Note: If measurements are taken in different samples successively, it is

recommended to clean the electrode thoroughly to avoid cross-

contamination. After cleaning, rinse the electrode with water

and then with some of the solution to be tested.

MANUAL TEMPERATURE COMPENSATION

• When the temperature probe is not connected, the default

temperature value is 25°C.

• To temperature compensate the pH read-

ing, measure the temperature of the solution

with a ChecktempC or another accurate

thermometer. E.g. 20°C.

• Press the RANGE key to enter the °C mode and adjust the

displayed value by using the arrow keys.

TAKING ORP MEASUREMENTS (for pH21 only)

•The meter is factory calibrated for ORP (mV) range. Please

contact the nearest Hanna Service Center for recalibration,

if needed.

• Connect an ORP electrode (optional, see "Accessories" section) to the

BNC connector on the rear panel (see page 4).

• Connect the 12VDC power adapter to the instrument (see page 4)

and then to the mains.

• Press the ON/OFF key to turn the meter

on.

• Press the RANGE key to select the ORP

(mV) mode.

• Remove the electrode protective cap, then immerse the ORP

electrode in the sample to be tested.

Note: The electrode should be submerged approximately 4 cm (1½")

into the solution.

Note: With refillable electrodes, to obtain a faster response unscrew

the refill hole cap during measurements.

• Shake briefly and wait a few seconds for

the reading to stabilize, i.e. when the

hourglass symbol stops blinking. The LCD

will show the ORP (mV) value.

TAKING pH MEASUREMENTS

• Make sure that the instrument has been calibrated for pH before

taking measurements (see "pH Calibration" section for details).

• Connect the supplied HI 1110B pH electrode to the BNC connec-

tor on the rear panel (see page 4).

• If automatic temperature compensation is required, connect the

HI 7662 temperature probe (optional) to the proper socket on

the rear panel (see page 4).

• Connect the 12VDC power adapter to the instrument (see page 4)

and then to the mains.

• Press the ON/OFF key to turn the meter

on.

• Press the RANGE key to select the pH

mode, if necessary.

• Remove the electrode protective cap, then immerse the pH

electrode and the temperature probe in the sample to be tested.

Note: If the pH electrode is dry, immerse it in HI 70300 storage

solution for at least one hour to reactivate it.

Note: The pH electrode should be submerged

approximately 4 cm (1½") into the

solution and the temperature probe (if

used) should be located as close as

possible to the electrode.

Note: With refillable electrodes, to obtain a faster response unscrew

the refill hole cap during measurements.

• Shake briefly and wait a few seconds for

the reading to stabilize, i.e. when the

hourglass symbol stops blinking. The LCD

will show the pH value automatically com-

pensated for temperature variations.

• After measurements, turn the meter off by pressing the ON/OFF

key, disconnect the power adapter from the mains and the pH

electrode from the instrument.

• Store the electrode with a few drops of HI 70300 solution in the

protective cap.

NEVER USE DISTILLED OR DEIONIZED WATER FOR STORING

PURPOSES.

OPERATIONAL GUIDE

pH CALIBRATION

For better accuracy the instruments should be calibrated frequently,

and however:

1. After electrode replacement.

2. After testing aggressive chemicals.

3. At least once a month.

4. When extreme accuracy is required.

• Turn the instrument on after connecting the pH electrode and the

temperature probe.

• Immerse the temperature probe together with the electrode into

pH 7.01 buffer solution or manually set the temperature (see the

note here below).

Note: The pH electrode should be submerged approximately 4 cm

(1½") into the solution and the temperature probe should be

located as close as possible to the electrode.

Note: If the temperature probe is not used, measure the buffer value

with a thermometer, enter the °C mode by pressing the RANGE

key and adjust the displayed value by using the arrow keys.

• Press the RANGE key to display pH readings.

•Press the CAL key to enter the calibration mode: the display

flashes "pH 7.01" and the hourglass symbol lights up.

• Wait till the hourglass symbol on the LCD turns off and the "pH"

tag stops blinking, then press CFM to confirm the first calibration

point (offset). "pH 4.01" will flash on the LCD.

• If a single point calibration at pH 7.01 is desired, press the CAL

key to exit, otherwise proceed with the second point.

• Rinse and immerse both pH electrode and temperature probe (if

used) in pH 4.01 or pH 10.01 buffer solution. The meter

automatically recognizes the buffer and displays the correct value.

• After measurements, turn the meter off by pressing the ON/OFF

key, disconnect the power adapter from the mains and the

electrode from the instrument.

Note: To perform correct ORP measurements, the surface of the ORP

electrode must be clean and smooth.

Note: When not in use, the tip of the electrode should be kept moist

and safe from any mechanical stress which might cause

damage to the glass/platinum junction.

TAKING TEMPERATURE MEASUREMENTS

•The meter is factory calibrated for temperature range.

Please contact the nearest Hanna Service Center for

recalibration, if needed.

• Connect the HI 7662 temperature probe (optional) to the proper

connector on the rear panel (see page 4).

• Connect the 12VDC power adapter to the instrument (see page 4)

and then to the mains.

• Press the ON/OFF key to turn the meter

on.

• Press the RANGE key to select the tem-

perature (°C) mode.

• Immerse the probe in the sample to be tested.

• Shake briefly and wait a few seconds for

the reading to stabilize, i.e. when the

hourglass symbol stops blinking. The LCD

will show the temperature (°C) value.

• After measurements, turn the meter off by pressing the ON/OFF

key, disconnect the power adapter from the mains and the probe

from the instrument.

HOLD FUNCTION

• To freeze a reading on display, from measurement mode press

and hold the HOLD key. The "HOLD" tag will light up.

• The meter returns to normal mode when the HOLD key is released.

Note: The RANGE key is not working while in HOLD mode.

1110

ELECTRODE CONDITIONING & MAINTENANCE

PREPARATION

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.

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

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 or HI 7007 pH 7.01 buffer 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.

Refill the electrode with fresh electrolyte (see the electrode’s specifica-

tions to select the correct refilling solution). Allow the electrode to

stand upright for 1 hour. Follow the Storage Procedure.

• Wait till the hourglass symbol on the LCD turns off and the "pH"

tag stops blinking, then press CFM to confirm the second calibra-

tion point (slope).

• The meter automatically returns to normal measurement mode.

Note: To abort a calibration procedure and save previous calibration

data, press the CAL key while the "pH" tag is still blinking.

Recommendations for Users

Before using these products, make sure that they are entirely suitable for the environ-

ment in which they are used.

Operation of these instruments in residential area could cause unacceptable inter-

ferences to radio and TV equipments, requiring the operator to take all necessary

steps to correct interferences.

The glass bulb at the end of the 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 these instruments when voltages at the measure-

ment surface exceed 24VAC or 60VDC.

To avoid damages or burns, do not perform any measurement in microwave ovens.

1312

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

REFILLING ELECTROLYTE SOLUTIONS

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

junction electrodes

HI 8071 3.5M KCl + AgCl electrolyte, 4 x 30 mL, for single

junction electrodes (FDA approved bottle)

HI 7072 1M KNO3electrolyte, 4 x 30 mL

CLEANING PROCEDURE

General : Soak in HI 7061 General Cleaning Solution for about 30

minutes.

Removal of films, dirt or deposits on the membrane/junction:

Protein : Soak in HI7073 Protein Cleaning Solution for 15 minutes.

Inorganic : Soak in HI 7074 Inorganic Cleaning Solution for 15

minutes.

Oil/grease : Soak in 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 HI70300

Storage Solution for at least 1 hour before taking measurements.

TROUBLESHOOTING

Evaluate the electrode performance based on the following.

•Noise (Readings fluctuate up and down) could be due to:

- Clogged/Dirty Junction: refer to the Cleaning Procedure.

- Loss of shielding due to low electrolyte level: refill with

proper solution.

•Dry Membrane/Junction: soak in HI70300 Storage Solution for

at least 1 hour.

•Drifting: soak the electrode tip in warm HI7082 Solution for one

hour and rinse the tip with distilled water (refill with fresh

electrolyte if necessary).

•Low Slope: refer to the Cleaning Procedure.

•No Slope: - Check the electrode for cracks in glass stem or bulb

(replace the electrode if cracks are found).

- Make sure cable and connections are not dam-

aged nor lying in a pool of water or solution.

•Slow Response/Excessive Drift: soak the tip in HI7061 Solu-

tion for 30 min, rinse thoroughly in distilled water and then

follow the Cleaning Procedure.

•For ORP Electrodes: polish the metal tip with a lightly abrasive

paper while paying attention not to scratch the surface, then

wash it thoroughly with water.

Note: For field applications, it is always recommended to keep a

conditioned spare electrode handy. When anomalies can not

be resolved with a simple maintenance, change the electrode

and recalibrate the meter.

HI 2031B Glass body, semimicro, conic tip, refillable, combina-

tion. Use: semisolid products.

FC 100B PVDF body, double junction, refillable, combination.

Use: general purpose for food industry.

FC 200B PVDF body, open junction, conic shape, Viscolene, non-

refillable, combination. Use: meat, cheese.

FC 210B Glass body, double junction, conic shape, Viscolene,

non-refillable, combination. Use: milk, yogurt.

FC 220B Glass body, triple ceramic junction, refillable, combina-

tion. Use: food processing.

ORP ELECTRODES

All electrode part numbers ending with B are supplied with BNC

connector and 1 m (3.3') cable.

HI 3131B Glass body, refillable, combination, platinum sensor.

Use: titration.

HI 3230B Plastic body, gel-filled, combination, platinum sensor.

Use: general purpose.

HI 4430B Plastic body, gel-filled, combination gold sensor.

Use: general purpose.

For a complete list of available pH and ORP electrodes, consult the

Hanna General Catalog or visit www.hannainst.com

OTHER ACCESSORIES

ChecktempC Pocket-size thermometer (range -50.0 to 150.0°C)

HI 710005 115 Vac/12 Vdc power adapter, US plug

HI 710006 230 Vac/12 Vdc power adapter, European plug

HI 76405 Electrode holder

HI 7662 Temperature probe with 1 m (3.3') 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

HI 8072 1M KNO3electrolyte, 4 x 30 mL (FDA approved bottle)

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

electrodes

HI 8082 3.5M KCl electrolyte, 4 x 30 mL, for double junction

electrodes (FDA approved bottle)

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

All electrode part numbers ending with B are supplied with BNC

connector and 1 m (3.3') cable.

HI 1043B Glass body, double junction, refillable, combination.

Use: strong acid/alkali.

HI 1048B Glass body, annular open junction, refillable, combina-

tion. Use: wine processing.

HI 1053B Glass body, triple ceramic junction, conic shape, refill-

able, combination. Use: emulsions.

HI 1083B Glass body, micro, Viscolene, non-refillable, combina-

tion. Use: biotechnology, micro titration.

HI 1110B Glass body, single junction, gel-filled, combination.

Use: general purpose.

HI 1131B Glass body, single junction, refillable, combination.

Use: general purpose.

HI 1230B Plastic body, double junction, gel-filled, combination.

Use: general, field.

HI 1330B Glass body, semimicro, single junction, refillable, com-

bination. Use: laboratory, vials.

HI 1331B Glass body, semimicro, single junction, refillable, com-

bination. Use: flasks.

HI 1332B Plastic body, double junction, refillable, combination.

Use: general purpose.

HI 1413B Glass body, single junction, flat tip, Viscolene, non-

refillable, combination. Use: surface measurement.

MANPH21R1 07/05

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. 66.2619.0708 • Fax 66.2619.0061

United Kingdom:

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

USA:

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

For e-mail contacts and complete list of Sales and

Technical offices, please see www.hannainst.com

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