Hanna Instruments HI 99121 Manuel utilisateur

SPECIFICATIONS

Instruction Manual

HI 99121

Soil pH Test Kit

www.hannainst.com

PRELIMINARY EXAMINATION

Remove the test kit from the packing material and examine it

carefully to make sure that no damage has occurred during

shipping. If there is any damage, immediately notify your dealer.

Each kit includes:

•HI 99121 portable pH meter

•HI 1292D pH electrode

• pH 4.01 & pH 7.01 buffer solutions (20 mL each)

•HI 700663 cleaning solution for inorganic soil deposits

•HI 700664 cleaning solution for organic soil deposits

•HI 7051M soil preparation solution

•HI 721319 ground auger

• 3 x 1.5V AA alkaline batteries

• 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.

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 more

precise idea of its versatility.

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

mail us at [email protected].

This instrument is in compliance with the directives.

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 probes are

warranted for a period of six months.

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

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

maintenance 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 problem.

First obtain a Returned Goods Authorization number from the Cus-

tomer Service department, then return the instrument with the

Authorization number included along with shipment costs prepaid.

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

the charges. When shipping any instrument, make sure it is properly

packaged for complete protection.

TABLE OF CONTENTS

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

WARRANTY ......................................................................... 3

SOIL pH ............................................................................... 4

ORGANIC SUBSTRATE ...................................................... 8

IRRIGATION WATER ........................................................... 8

NUTRIENT SOLUTION........................................................ 8

pH METER SPECIFICATIONS...........................................11

OPERATING THE pH METER ...........................................12

pH MEASUREMENT & CALIBRATION ..............................13

METER SETUP...................................................................14

ELECTRODE CLEANING ...................................................15

BATTERY REPLACEMENT................................................15

pH is the measure of the hydrogen ion concentration [H+]. Soil

can be acid, neutral or alkaline, according to its pH value.

Fig. 1 shows the relationship between the scale of pH and

types of soil. Most plants prefer a pH range from 5.5 to 7.5;

but some species prefer more acid or alkaline soils.

Nevertheless, every plant requires a particular range of pH,

for optimum growth.

pHstronglyinfluencestheavailabilityofnutrientsandthepresence

of microorganisms and plants in the soil.

For example, fungi prefer acidic conditions whereas most

bacteria, especially those supplying nutrients to the plants,

have a preference for moderately acidic or slightly alkaline

soils. In fact, in strongly acidic conditions, nitrogen fixing and

the mineralization of vegetable residual is reduced.

Plants absorb the nutrients dissolved in the soil water and the

nutrient solubility depends largely on the pH value. Hence, the

availability of elements is different at different pH levels (Fig.2).

SOIL pH Each plant needs elements in different quantities and this is the

reason why each plant requires a particular range of pH to

optimize its growth.

For example, iron, copper and manganese are not soluble in

an alkaline environment. This means that plants needing these

elements should theoretically be in an acidic type of soil.

Nitrogen, phosphorus, potassium and sulfur, on the other

hand, are readily available in a pH range close to neutrality.

Furthermore, abnormal pH values, increase the concentration

of toxic elements for plants. For example, in acid conditions,

there can be an excess of aluminum ions in such quantities

that the plant can not tolerate.

Negative effects on chemical and physical structure are also

present when pH values are too far from neutral conditions

(break up of aggregates, a less permeable and more compact

soil).

Management of the soil in relation to the pH value

Once the pH value is known, it is advisable to choose crops

that are suitable for this range (e.g. in an acid soil, cultivate

rice, potato, strawberry).

Add fertilizers that do not increase acidity (for example urea,

calcium nitrate, ammonium nitrate and superphosphate) or

lower alkalinity (e.g. ammonium sulfate).

It is recommended that a cost evaluation is made prior to

commencement of the soil pH modification. Corrective

substances can be added to modify the soil pH, however, the

effects are generally slow and not persistent. For example, by

adding lime, the effects in clay soil can last for as long as 10

years, but only 2-3 years in a sandy soil.

For an acid soil, we can use substances such as lime, dolomitic,

limestone and marl, according to the nature of the soil (Tab.1).

Soil Ameliorants Clay soil Silty soil Sandy soil

CaO 30-50 20-30 10-20

Ca(OH)239-66 26-39 13-26

CaMg(CO3)249-82 33-49 16-33

Ca CO354-90 36-54 18-36

Tab.1. Quantity (q/ha) of pure compound necessary to in-

crease 1 unit of pH

Fig. 1. Types of soil according to the pH value

Fig. 2. Solubility of the elements according to varying pH

High pH levels can depend on different elements, hence, there

are different methods for its correction.

- Soils rich with limestone:

Add organic matter (this is due to the fact that non-organic

ameliorants such as sulfur and sulfuric acid might not make

economic sense due to the large quantities needed).

- Alkaline-saline soils:

Alkalinity is due to the presence of salts (in particular a high

concentration of sodium can be harmful).

Irrigation washes away salts, hence, an appropriate use of

irrigation can provide positive results (drop-irrigation being the

most recommended).

If alkalinity is caused by sodium, it is recommended to add

substances such as gypsum (calcium sulfate), sulfur or other

sulfuric compounds (Tab.2). Also in this case, a cost evaluation

is necessary.

Soil ameliorants (pure compounds) Quantity (kg)

Calcium chloride: CaCl2· 2H2O85

Sulfuric acid: H2SO457

Sulfur: S 19

Iron sulfate: Fe2 (SO4)3 · 7H2O 162

Aluminum sulfate: Al2 (SO4)3129

Tab.2. Quantities provide the same result as 100 kg of gypsum

Procedure for direct ground measurement

1) Dig, discarding 5 cm of topsoil

2) Perforate the soil (with HI 721319 soil drill) to a depth of

about 20 cm or more

3) If the soil is dry, moisten it with a small amount of distilled

water

4) Wash the electrode with tap water (not distilled)

5) Insert the electrode pushing it slightly into the soil to ensure

proper contact

6) Observe the measurement

7) Wash the electrode with tap water (not distilled) and (using

a finger) gently remove any soil remaining on the electrode

(avoid using a rag or cloth)

8) Repeat the procedure in different locations in the field

9) Consider the average of the measured data

Forbest result, it is advisabletomeasurethepH of a soil solution,

using a sample of soil and soil preparation solution HI 7051; it is

better to use this procedure if you have to test a stony field in

which you risk damaging the electrode.

Procedure for the measurement of soil solution (1:2,5)

A) Sampling

1) Extracting Soil Sample.

Take 1 sample per 1000 m2(0.25 acre) of homogeneous

area.

Even for small areas, 2 samples are recommended (the

more the samples, the better the end-results, because the

result is more representative).

2) Avoid extracting samples from soil presenting obvious

anomalies and consider them separately.

3) Sample quantity:

Take the same quantity of soil for each sample. For example,

use bags with similar dimensions (1 bag per sample).

4) Depth of extraction:

General: dig and discard 5 cm (2") of topsoil.

Herbaceous crops: from 20 to 40 cm of depth (8" to 16").

Orchards: from 20 to 60 cm of depth (8" to 24'’).

5) Spread the soil samples on the pages of a newspaper and

let the soil dry in a shady place or put it in an oven at 40°C.

6) Crumble the dried soil and mix all the samples together to

obtain a homogeneous mixture, discarding stones and

vegetable residues.

7) From this mixture, take the soil sample for analysis.

B) Soil solution preparation and measurement

1) Sift the soil at 2 mm.

2) Weigh 10 g of soil and put it in 25 ml of soil preparation

solution HI 7051 (use the apposite beaker) or 20 g of soil per

50 ml of soil preparation solution HI 7051.

3) Mix for 30 seconds.

4) Wait for about 5 minutes.

5) Mix again and measure the pH of the solution.

ORGANIC SUBSTRATE

pH measurements of organic substrates is important in

greenhouses and nursery growing pots. pH should be checked

at the outset to make sure that the pH of the substrate bought

is that desired (pH can change if too much time elapses from

the date of packaging to the moment of utilization).

A) Direct measurement in pot

If the substrate is dry, add a little distilled water. Insert the

electrode into the soil and take measurement.

B) Measurement of the organic substrate solution (1:2)

Let the substrate dry and discard the coarse vegetable residues

and pebbles.

Prepare a solution composed of 1 part of mould and 2 parts

of HI 7051 solution (for example: fill the beaker with the

substrate up to 50 ml, press it gently, empty the content in

another container and add 100 ml of HI 7051 solution).

Mix for 30 seconds and then wait for 5 minutes. Mix again and

measure the pH of the solution.

NUTRIENT SOLUTION

A rational fertilization is needed for optimum plants growth in

greenhouses. The pH value of the nutrient solution (water +

fertilizer) has to meet the plants need.

If a fertirrigation system with automatic pH control is used,

ensure that it is functioning properly.

Check the pH of the irrigation solution as well as any recycled

solution.

IRRIGATION WATER

The quality of irrigation water is a very important factor. If the

pH value is very far from pH 7, it is possible that other

anomalies are present.

Ranges for evaluation of water quality:

- 6 to 8.5 pH: good, it can be utilized without problems.

- 5 to 6 pH or 8.5 to 9 pH: sufficient, sensible crops could

have problems.

- 4 to 5 pH or 9 to 10 pH: scarce, use it carefully, avoid

wetting the vegetation.

- pH<4 or pH>10: very scarce, there are other anomalies that

have to be identified via chemical analysis.

ORCHARD PLANTS

Preferred pH Range Preferred pH Range

Apple 5-6.5 Orange 5-7

Apricot 6-7 Peach 6-7.5

Cherry 6-7.5 Pear 6-7.5

Grapefruit 6-7.5 Plum 6-7.5

Grapevine 6-7 Pomegranate 5.5-6.5

Lemon 6-7 Walnut 6-8

Nectarine 6-7.5

VEGETABLES AND HERBACEOUS CULTIVATIONS

Preferred pH Range Preferred pH Range

Artichoke 6.5-7.5 Pepper 6-7

Asparagus 6-8 Early Potato 4.5-6

Barley 6-7 Late Potato 4.5-6

Bean 6-7.5 Sweet Potato 5.5-6

Brussels Sprout 6-7.5 Pumpkin 5.5-7.5

Early carrot 5.5-7 Rice 5-6.5

Late carrot 5.5-7 Soybean 5.5-6.5

Cucumber 5.5-7.5 Spinach 6-7.5

Egg Plant 5.5-7 Strawberry 5-7.5

Lettuce 6-7 String 6-7.5

Maize 6-7.5 Sugar beet 6-7

Melon 5.5-6.5 Sunflower 6-7.5

Oat 6-7 Tomato 5.5-6.5

Onion 6-7 Watermelon 5.5-6.5

Pea 6-7.5 Wheat 6-7

LAWN

Preferred pH Range

Lawn 6-7.5

GARDEN PLANTS AND FLOWERS

Preferred pH Range Preferred pH Range

Acacia 6-8 Ligustrum 5-7.5

Acanthus 6-7 Magnolia 5-6

Amaranth 6-6.5 Narcissus 6-8,5

Bougainvillea 5.5-7.5 Oleander 6-7.5

Dahlia 6-7.5 Paulownia 6-8

Erica 4.5-6 Portulaca 5.5-7.5

Euphorbia 6-7 Primula 6-7.5

Fuchsia 5.5-7.5 Rhododendron 4.5-6

Gentian 5-7.5 Roses 5.5-7

Gladiolus 6-7 Sedum 6-7.5

Hellebore 6-7.5 Sunflower 5-7

Hyacinth 6.5-7.5 Tulip 6-7

Iris 5-6.5 Viola 5.5-6.5

Juniper 5-6.5

1110

HOUSE PLANTS

Preferred pH Range Preferred pH Range

Abutilon 5.5-6.5 Gardenia 5-6

African violet 6-7 Geranium 6-8

Anthurium 5-6 Hibiscus 6-8

Araucaria 5-6 Jasmine 5.5-7

Azalea 4.5-6 Kalanchoe 6-7.5

Begonia 5.5-7.5 Mimosa 5-7

Camellia 4.5-5.5 Orchid 4.5-5.5

Croton 5-6 Palms 6-7.5

Cyclamen 6-7 Peperomia 5-6

Dieffenbachia 5-6 Philodendron 5-6

Dracaena 5-6 Yucca 6-7.5

Freesia 6-7.5

Range (*) -2.00to 16.00pH

-5.0to105.0°C/23.0to221.0°F

Resolution 0.01 pH / 0.1°C / 0.1°F

Accuracy ±0.02pH

(@20°C/68°F) ±0.5°Cupto60°C;±1°Coutside

±1°Fupto140°F;±2°Foutside

Temperature Compensation Automatic

pH Calibration Automatic,1or2point

with2setsofmemorizedbuffers

Probe (included) HI1292DpH/temperatureprobe

Battery Type / Life 3x1.5VAA(IECLR6)/ approx.1500hours

Auto-off After8minutesofnon-use

Environment 0 to 50°C (32 to 122°F); RH 100%

Dimensions 150x80x36mm(5.9x 3.2 x 1.4”)

Weight 210g(7.4 oz.)

(*) The temperature range is limited to 80°C (176°F) if using the

HI1292D probe.

To clean the meter, use water only.

pH METER SPECIFICATIONS

1312

To connect the probe

Withthemeterturnedoff,connecttheHI 1292DprobetotheDIN

socketonthetopofthemeterbyaligningthepinsandpushingin

theplug.Tightenthenuttoensureagoodconnection.Remove

the protective cap from the probe before taking any measure-

ments.

To turn the meter ON and check the battery status

Press the ON/OFF/MODE button until the display lights up.At

start-up,alltheLCDsegmentsaredisplayedfor1second,then

the percent indication of the remaining battery life is shown for

anothersecond (E.g. % 100BATT).Themeterthen enters the

normal measuring mode.

Note: If the display needs to be checked, keep the ON button

pressedwhileturningthemeteron.Themeterwilldisplayall

segments as long as the button is pressed.

To freeze the display

While in measurement mode, press the SET/HOLD button,

HOLD appears on the secondary display and the reading will

be frozen on the LCD (E.g. pH 5.73 HOLD). Press any button

to return to normal mode.

To turn the meter OFF

Whileinnormalmeasurementmode,presstheON/OFF/MODE

button.OFF will appear on the secondarydisplay.Releasethe

button.

Note:Themeterisprovidedwithanacousticsignalfeature,which

canbedisabledusingtheswitchlocatedinthebatterycom-

partment.

Note:Whenthemeterdetectstheabsenceofatemperatureprobe

atitsinput,theAutomaticTemperatureCompensationisturned

off,andthemeterusesadefaultvalueof25°C(77°F)forthe

temperaturemeasurementandcompensation.Inthiscondi-

tion,thesecondaryLCDshows25.0°C(77.0°F)blinking.

Whenaprobeisconnected,themeterautomaticallyreturns

totheATCmode,theATCtagisturnedon,andthetempera-

tureisshownonthesecondarydisplay.

• Makesurethemeterhasbeencalibratedbeforeuse.

• If the probe is dry, soak it in HI 70300 storage solution for

one hour to reactivate it.

• Placethetipoftheprobeintothesampletobetested,stirbriefly

andwaituntilthestabilitysymbolontheLCDisturnedoff.

• TheLCDshowsthepHvalue(automaticallycompensatedfor

temperature) on the primary LCD, while the secondary LCD

showsthetemperatureofthesolution.

• Ifmeasurementsaretakenindifferentsamplessuccessively,rinse

theprobetipthoroughlytoavoidcontaminations.Aftercleaning,

rinsetheprobetipwithsomeofthesampletobemeasured.

pH calibration

For better accuracy, a frequent electrode cleaning (see

also pag. 15) and meter calibration is recommended.

In addition, the instrument must be recalibrated whenever:

a) The pH electrode is replaced.

b) After testing aggressive chemicals.

c) Where high accuracy is required.

d) At least once a month.

• Fromnormalmode,press&holdON/OFF/MODEuntilOFFon

thesecondarydisplayisreplacedbyCAL.Releasethebutton.

• TheLCDentersthecalibrationmode,displaying“pH7.01USE”

(or“pH6.86USE”iftheNISTbuffersetwasselected).After1

secondthemeteractivatestheautomaticbufferrecognitionfea-

ture.Ifavalidbufferisdetected,thenitsvalueisshownonthe

primary display, and REC appears on the secondary LCD. If

novalidbufferisdetected,themeterkeepstheUSEindication

activefor12seconds,andthenreplacesitwithWRNG,indicat-

ingthatthesamplebeingmeasuredisnotavalidbuffer.

• For a single-point calibration with buffers pH 4.01, 9.18 or

10.01,themeterautomaticallyacceptsthecalibrationwhenthe

readingisstable;themeterwillshowontheprimarydisplaythe

accepted buffer, with the message “OK 1” on the secondary

display,andanaudiblesignalisproduced.After1secondthe

meterautomaticallyreturnstothenormalmeasuringmode.

Ifasingle-pointcalibrationwithbufferspH7.01or6.86isde-

sired,thenafterthecalibrationpointhasbeenacceptedpress

the ON/OFF/MODE button in order to return to the normal

measuringmode.Afterthebuttonispressed,themetershows

OPERATING THE pH METER pH MEASUREMENT & CALIBRATION

1514

"7.01"(or"6.86")-"OK1",andanaudiblesignalisproduced.

After1second,themeterautomaticallyreturnstothenormal

measuringmode.

Note:Itisalwaysrecommendedtocarryoutatwo-pointcalibra-

tionforbetteraccuracy.

• Foratwo-pointcalibration,placetheprobeinpH7.01(orpH

6.86) buffer. After the calibration point has been accepted,

the “pH 4.01 USE” message appears. The message is held

for12seconds,unlessavalidbufferisrecognized.Ifnovalid

bufferisrecognized,thentheWRNG messageisshown. Ifa

validbuffer(pH4.01, pH10.01 orpH9.18)is detected, then

the meter completes the calibration procedure. When the

buffer is accepted, the LCD shows the accepted value with

the “OK 2” message on the secondary display. The meter

then returns to the normal measuring mode.

Note:Whenthecalibrationiscompleted,theCALtagisturnedon.

To quit calibration and to reset to the default values

• Afterenteringthecalibrationmodeandbeforethefirstpointisac-

cepted,itispossible to quit the procedure and return to the last

calibrationdatabypressingON/OFF/MODE.ThesecondaryLCD

displaysESCfor1sec.andthemeterreturnstonormalmode.

• Toresettothedefaultvaluesandclearapreviouscalibration,

presstheSET/HOLDbuttonafterenteringthecalibrationmode

andbeforethefirstpointisaccepted.

ThesecondaryLCDdisplaysCLRfor1sec,themeterresetstothe

defaultcalibrationandthe“CAL”tagontheLCDdisappears.

SetupmodeallowstoselectthetemperatureunitandthepHbuffer

set.ToentertheSetupmode,press&holdON/OFF/MODEuntil

CAL on the secondary display is replaced by TEMP and the

currenttemperatureunit(E.g.TEMP°C).Then:

•for°C/°Fselection,usetheSET/HOLDbutton.Afterthetem-

perature unit has been selected, press ON/OFF/MODE to

enter the buffer set selection mode; press ON/OFF/MODE

twice to return to the normal measuring mode.

•tochangethecalibrationbufferset,aftersettingthetempera-

tureunit,themeter will show the current buffer set: “pH 7.01

BUFF” (for 4.01/7.01/10.01) or “pH 6.86 BUFF” (for 4.01/

6.86/9.18). Change the set with the SET/HOLD button, then

press ON/OFF/MODE to return to normal mode.

The meter displays the remaining battery percentage when

turned on. When the level is below 5%, the

- +

symbol on the

bottomleft of the LCD blinks toindicatealowbattery condition.

If the battery level is low enough to cause erroneous readings,

theBatteryErrorPreventionSystem(BEPS)turnsthemeteroff.

Unscrew the 4 screws located on the back of the meter and

carefully replace the 3 AA batteries located in the battery com-

partment, while paying attention to their polarity. Reattach the

back making sure that the gasket is in place and tighten the 4

screws to ensure a watertight seal.

METER SETUP BATTERY REPLACEMENT

ELECTRODE CLEANING

AfrequentcleaningofthepHelectrodeisstronglyrecommendedto

ensurecorrectcalibrationandreliablereadings.

HannaInstrumentshasdevelopedacompleteseriesofcleaning

solutionsdedicatedtospecificapplicationsandkindofdirtythathas

toberemovedfromtheelectrode.

Insoilmeasurementsyoucanchoosebetweentwodifferentsolu-

tionsaccordinglytothetypeoftestedsoil:

•HI700663 isindicatedfor inorganicsoildeposits(asminerals,

limestone,adsorbedclays)

•HI700664isspecificfororganicsoildeposits(humus)

Ifcleaningisperformedfrequently,soaktheelectrodeinthespecific

solutionforafewminutes.

If the electrode has not be cleaned for a while, for a complete

removalofsoildeposits,proceedasfollows:

•wipetheelectrodebody(notbulb)withpaperorsofttissue

•rubthereferencewithabrasivepaper

•immerseintocleaningsolutionforatleast15minutes.

MAN99121R3 09/05

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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