Hanna Instruments HI 9143 User manual

Instruction Manual

HI 9143 • HI 9145

Portable D.O. Meters

in Water-Resistant Casing

HI 9143

Microprocessor

Auto Cal

Dissolved

Oxygen Meter

CAL

ON/OFF

RANGE

FACTOR

SAMPLE

HOLD

ppm

°C

www.hannainst.com

DearCustomer,

ThankyouforchoosingaHANNAproduct.

Please read this instruction manual carefully

before using the instrument.

This manual will provide you with the neces-

saryinformationfora correct useoftheinstru-

ment.

Ifyouneedadditionaltechnicalsupport,donot

hesitatetoe-mailusat[email protected]

These instruments are in compliance with the

CEdirectives.

PreliminaryExamination ............................. 3

GeneralDescription..................................... 3

FunctionalDescription-Probe .................... 4

FunctionalDescription-Meter..................... 5

Specifications ............................................. 6

ProbePreparation ....................................... 7

Calibration................................................... 8

TakingMeasurements............................... 10

AltitudeCompensation .............................. 12

SalinityCompensation .............................. 13

Probe&MembraneMaintenance .............. 14

BatteryReplacement ................................ 16

Accessories.............................................. 17

Warranty ................................................... 18

CEDeclarationofConformity .................... 19

PRELIMINARYEXAMINATION

Removetheinstrumentfromthepackingmaterial

and examine it to make sure that no damage

has occurred during shipping. If there is any

damage,immediatelynotifyyourdealer.

Each meter is supplied complete with:

• HI76407/4 DOprobewith4m(13’)cable

•2sparemembraneswithO-rings

•Protectivecap

• HI 7041S electrolyte solution (30 mL)

•Batteries (4 x 1.5V AA)

•Instructionmanual

• Ruggedcarryingcase

Note: Save all packing material until you are

sure that the instrument functions

correctly. Any defective items must be

returnedin theoriginal packingwith the

supplied accessories.

GENERAL DESCRIPTION

HI 9143 and HI 9145 are water-resistant

dissolved oxygen meters designed for harsh

outdoor applications, especially waste water

treatmentandfishfarming.

Simpleon-sitecalibrationrequires no chemical

solutions. Just expose the probe to air and

press the CAL button. In a few minutes, the

meter is calibrated and ready to use.

The new and improved HI 9143 and HI 9145

measure and display O2from 0 to 300%, 0 to

45mg/L and temperaturefrom 0 to 50 °C.

In addition to the features of HI 9145, HI 9143

also supplies the user with compensation of

salinity and altitude factors.

Both meters compensate for the temperature

effect.

TABLE OF CONTENTS

FUNCTIONAL DESCRIPTION - PROBE

1. D.O. probe

2. Protective cap

3. Watertight shielded cable

4. Polypropylene body

5. Temperature sensor

6. O-Ring seal

7. AgCl (silver chloride) anode

8. Platinum cathode

9. Oxygen permeable membrane

10. Membrane cap

FUNCTIONAL DESCRIPTION - METER

1) Battery compartment

2) Probe connector

3) Liquid Crystal Display (LCD)

4) ON/OFF key

5) CAL key, to enter/exit calibration mode

6) FACTOR* key, to select altitude (F1)

and salinity (F2)

7) UP* and DOWN* arrow keys, to set F1

and F2 values

8) HOLD key, to freeze reading on display

9) RANGE key, to select oxygen measure-

ment range (ppm or % of saturation)

10) Socket for 12 Vdc power adapter

19) “LOW BAT”, low battery indicator

20) “SAMPLE”, measuring mode indicator

21) “F1”, altitude factor* indicator

22) “F2”, salinity factor* indicator

23) “%” or “ppm”, oxygen measure unit

24) Secondary display

(*) HI 9143 only

HI 9143

Microprocessor

Auto Cal

Dissolved

Oxygen Meter

CAL

ON/OFF

RANGE

FACTOR

210

SAMPLE

LOBAT

SAMPLE

HOLD

CAL F1

HOLD

ppm

°C

210

Thedissolved oxygen probeis providedwith a

membranecovering the polarographic sensor

elements,andabuilt-in thermistor for tempera-

turemeasurementand compensation.

The thin permeable membrane isolates the

sensor elements from the testing solution, but

allows oxygen to enter.

When a voltage is applied across the sensor,

oxygen that passes through the membrane

causesacurrentto flow fromwhichtheoxygen

concentrationis determined.

All HANNA D.O. probes are shipped dry. To

hydrate the probe and prepare it for use,

connect it to the meter and proceed as fol-

lows.

1. Remove the red & black plas-

tic cap used for shipping pur-

poses only.

2. Wet the sensor by soaking

the bottom (2.5 cm/1") of the

probe in HI 7041S electrolyte

solution for 5 minutes.

3. Rinse the sup-

plied membrane

(HI76407A) with

some electro-

lyte while shak-

ing it gently.

Refill with fresh

electrolyte.

4. Gently tap the

sides of the

membrane with

your finger to

ensure that no

air bubbles re-

main trapped.

To avoid any

damage, do not

tap the membrane directly on the bottom.

5. Make sure that the rubber O-ring sits prop-

erly inside the membrane cap.

6. With the sensor facing down, screw the

cap clockwise. Some electrolyte will over-

flow.

When not in use, protect the

membrane with the supplied cap.

SPECIFICATIONS

Shipping

cap

black

red

THEN SCREW

BACK ON

THIRD

TAP

SECOND

FILL

FIRST

INSERT

O’RING

HI 9143 HI 9145

Range 0.00 to 45.00 mg/L O2

0.0 to 300.0%O2

0.0 to 50.0°C

Resolution 0.01 mg/L / 0.1%O2

0.1°C

Accuracy (@20°C/68°F)

±1.5% FS (O2)

±0.5°C

TypicalEMCDeviation

±0.3 mg/L / ±3.5%O2

±0.5 °C

Calibration Automatic, in air, at 100%

Temperature Compensation

Automatic, 0 to 50°C (32 to 122°F)

AltitudeCompensation

0 to 1900 m ---

(resolution 100 m)

SalinityCompensation

0 to 40 g/L ---

(resolution 1 g/L)

Probe HI 76407/4 polarographic

with 4 m (13’) cable (included)

Environment 0 to 50°C (32 to 122°F);

RH max 100%

PowerSupply 4 x 1.5V AA batteries;

approx. 200 hours of continuous use;

auto-off after 4 hours of inactivity;

or input for 12 Vdc adapter

Dimensions 196 x 80 x 60 mm

(7.7 x 3.1 x 2.4")

Weight 500 g (1.1 lb.)

PROBE PREPARATION

• For an accurate calibration, it is recom-

mendedtowaitanadditional5-10minutesto

ensureoptimumconditioningoftheprobe.

• Removetheprotectivecap.

• PressCAL.Thedisplyshows

"----"togetherwiththe"CAL"

symbol to indicate that the

instrument is in calibration

mode.

• Theinstrumentwillautomati-

callystandardizeitselftothe

actualsaturationvalue.After

approx. 1 minute it will dis-

play"100%"with"SAMPLE"

to indicate that the calibra-

tion is complete.

•HI 9143 only: press FACTOR and ensure

that F1 and F2 are set to the appropriate

altitudeandsalinityvalues.

Notes: • Theinstrumentmustbecalibrated

whenevertheprobe,membraneor

electrolyte is changed.

• Toexitthecalibration

mode at any time,

press CAL.

• The display may be

switchedfromreadings

in%saturationto ppm

(mg/L) by simply

pressing the RANGE

key. Recalibration is

notneeded.

CALIBRATION

PROBE POLARIZATION

The probe is under polarization with a fixed

voltageofapproximately800mV.Probepolar-

ization is essential for stable measurements

withthesamerecurring degree ofaccuracy.

With the probe properly polarized, oxygen is

continually"consumed"bypassingthroughthe

sensitivediaphragmanddissolvingintheelec-

trolytesolution containedinside the probe.

If this operation is interrupted, the electrolyte

solution continues to be enriched with oxygen

untilitreachesanequilibriumwiththesurround-

ing solution. Measurements taken with a non-

polarizedprobe give an oxygen level that indi-

cates that of the test solution as well as any

oxygenpresentintheelectrolytesolution.This

readingisobviouslyincorrect.

TheHANNAHI9143andHI9145oxygenmeter

automaticallypolarizetheprobeeachtimethey

areswitchedon.

Calibrationissimpleandisrecommendedevery

time the meter is switched on.

• Makesure the probe is readyfor measure-

ment (see page 7), i.e. the membrane is

filledwithelectrolyte,probeisconnectedto

themeterandproperlypolarized.

• Switch the meter on.

• "COND"appearsonthedis-

playto informthe user that

the probe is in auto-condi-

tioning(automaticpolariza-

tion)mode.

• Once"COND"disappears,theprobeispo-

larizedandtheinstrumentcanbecalibrated.

ON/OFF

CAL

SAMPLE

°C

CAL

RANGE

10 11

mg/L READINGS

The mg/L mode give the dissolved oxygen

concentration directly in ppm.

Ifthesamplecontainssignificantsalinityorif

themeasurementistakenatahigheraltitude

than sea level, the readout values must be

corrected, by taking into account the lower

degreeofoxygensolubilityinsuchconditions.

Compensation for altitude and sality effects

is possible with the HI 9143 model.

Altitude and/or salinity values should be set

beforecalibratingandtakingmeasurements.

Themeterwillautomaticallycompensatefor

these factors (see “Altitude Compensation”

and“SalinityCompensation”sections).

%O2SATURATION READINGS

The%O2readingprovidestherateofoxygen

saturationwithreferenceto

100% at sea level.

TEMPERATURE

READINGS

The secondary display will show the sample

temperatureinCelsiusdegrees.

Allow the probe to reach thermal equilibrium

with the sample before taking any

measurement. The greater the difference

between the ambient temperature and the

temperatureofthesample,thelongeritwilltake

the probe to acclimatized itself to the sample.

TAKINGMEASUREMENTS

Makesurethemeterhasbeen

calibrated and the protective

cap has been removed. Im-

mersethetipoftheprobeinthe

sample to be tested ensuring

thatthetemperaturesensoris

alsoimmersed.

Todisplayvaluesin% satura-

tion, press RANGE.

Foraccuratedissolvedoxygenmeasurements,

awatermovementofatleast30cm(12”)/secis

required.Thisistoensurethat oxygendepleted

onthemembranesurfaceisconstantlyreplen-

ished. A moving stream will provide adequate

circulation.

Duringfieldmeasurements,thisconditionmay

be obtained by manually stirring the probe.

Accurate readings are not possible while the

liquid is stationary.

Duringlaboratorymeasurements,theuseof a

magneticstirrertoensureacertainagitationof

thefluidisrecommended.Thisway,anyerrors

due to the presence of air bubbles on the

menbranesurfaceareminimized.

For accurate measurements, allow sufficient

timefor thethermal equilibrium to be reached

betweentheprobeandthemeasuredsample(a

few minutes if the temperature difference is

severaldegrees).

RANGE

SAMPLE

°C

12 13

ALTITUDE COMPENSATION

HI9143

Press FACTOR and “F1” will

bedisplayed.

Use the UP and DOWN keys

to set the altitude from 0 to

1900 m, in steps of 100 m.

HI9145

With HI 9145, all the DO readings refer to the

sealevel.AltitudeaffectstheDOconcentration

bydecreasing its value.

Thefollowingtablereportsthemaximumoxygen

solubilityatvarioustemperaturesandaltitudes.

Thetableprovidesanideaoftheerrorthatcan

be introduced at different altitudes and the

quantitytobesubtractedtocorrectthereading.

SAMPLE

ppm

or or

SAMPLE

ppm

°C

0 m

14.6

13.8

13.1

12.4

11.8

11.3

10.8

10.3

9.9

9.5

9.1

8.7

8.4

8.1

7.8

7.5

7.3

7.1

6.8

6.6

6.4

300 m

14.1

13.3

12.7

12.0

11.4

10.9

10.4

9.9

9.7

9.2

8.8

8.4

8.1

7.8

7.5

7.2

7.1

6.9

6.6

6.4

6.2

600 m

13.6

12.9

12.2

11.6

11.0

10.5

10.1

9.6

9.2

8.7

8.5

8.1

7.8

7.5

7.3

7.0

6.8

6.6

6.3

6.2

6.0

1200 m

12.7

12.0

11.4

10.8

10.3

9.8

9.4

9.0

8.6

8.3

7.9

7.7

7.3

7.0

6.8

6.5

6.4

6.2

5.9

5.7

5.6

1500 m

12.3

11.6

11.0

10.4

9.9

9.5

9.1

8.7

8.3

8.0

7.7

7.3

7.1

6.8

6.6

6.3

6.1

6.0

5.7

5.6

5.4

1800 m

11.8

11.2

10.6

10.1

9.6

9.2

8.8

8.3

8.0

7.7

7.4

7.1

6.8

6.6

6.3

6.1

5.9

5.8

5.5

5.4

5.2

°F

32.0

35.6

39.2

42.8

46.4

50.0

53.6

57.2

60.8

64.4

68.0

71.6

75.2

78.8

82.4

86.0

89.6

93.2

96.8

100.4

104.4

900 m

13.2

12.4

11.9

11.2

10.6

10.2

9.7

9.3

8.9

8.6

8.2

7.8

7.5

7.3

7.0

6.8

6.6

6.4

6.1

5.9

5.8

AltitudeaboveSeaLevel(inmeters)

35 g/L

9.0

8.6

8.3

8.0

7.6

7.4

7.1

6.9

6.6

6.4

30 g/L

9.3

8.9

8.6

8.2

7.9

7.6

7.3

7.1

6.8

6.6

°C

0 g/L

11.3

10.8

10.3

9.9

9.5

9.1

8.7

8.4

8.1

7.8

10 g/L

10.6

10.1

9.7

9.3

8.9

8.5

8.2

7.9

7.6

7.4

20 g/L

9.9

9.5

9.1

8.7

8.4

8.0

7.8

7.5

7.2

7.0

Salinity(g/L)atSeaLevel °F

50.0

53.6

57.2

60.8

64.4

68.0

71.6

75.2

78.8

82.4

HI9143

PressFACTORtwiceand“F2”

will be displayed.

PresstheUPandDOWNkeys

to set the salinity between 0

and 40 g/L. Press FACTOR

againtodisplaythetemperature.

HI9145

AllDOreadingsreferto0g/Lofsalinity.Salinity

affectstheDOconcentrationbydecreasingits

value.

Thetablebelowshowsthemaximumsolubility

ofoxygenatvarioustemperaturesandsalinity

levels. By using the table, the quantity to be

subtracted to correct the reading can be

calculated.

SALINITYCOMPENSATION

14 15

• With the sensor facing down, screw the

membrane cap clockwise. Some electro-

lytewilloverflow.

Theplatinumcathodesensorshouldalwaysbe

bright and untarnished. If it is tarnished or

stained, which could be due to contact with

certain gases or extended use with a loose or

damaged membrane, the cathode sensor

shouldbecleaned.

Useaclean,lint-freecardboardorcloth.Rubthe

cathodeverygently sidetoside 4-5times.This

willbeenoughtopolishandremoveanystains

withoutdamagingtheplatinumtip.Then,rinse

the probe with deionized or distilled water.

Install a new membrane and fill it with fresh

electrolyte following the instructions above.

Recalibratetheinstrument.

Important:Foraccurate and stablemeasure-

ments, it is important that the surface of the

membraneisin perfectcondition.Thisperme-

able membrane isolates the sensor elements

from the environment but allows oxygen to

enter.Ifanydirtisdepositedonthemembrane,

rinse it carefully with distilled or deionized

water. If any imperfection is observed, or any

damage is evident (such as wrinkles, tears or

holes),themembraneshouldbereplaced.Make

sure that the O-Ring is properly seated in the

membranecap.

PROBE & MEMBRANE MAINTENANCE

The oxygen probe body is made of reinforced

polypropylene for maximum durability.

Abuilt-inthermistorsensormeasuresthetem-

perature of the sample. It is recommended to

keeptheprotectivecapontheprobewhenthe

it is not in use.

To replace the membrane or refill it with

electrolyte, proceed as follows:

• Remove the protective

capbygentlytwistingand

pulling it off the probe

(fig.1).

• Unscrew the membrane

byturningitcounterclock-

wise(fig.2)

• Wet the sensor by soak-

ing the bottom (2.5 cm /

1")oftheprobeinHI7041S

electrolyte solution for 5

minutes.

• Rinse a new membrane

(HI 76407A) with some

electrolytewhileshaking

it gently. Refill with fresh

electrolyte.

• Gently tap the sides of

the membrane with your

finger to ensure that no

air bubbles remain

trapped. Do not directly

tap the bottom as this

may damage the mem-

brane.

• Make sure that the rub-

berO-ringisseatedprop-

erlyinsidethemembrane

cap.

TWIST

AND

PULL

fig. 1

UNSCREW

fig. 2

16 17

BATTERY REPLACEMENT

When the batteries become

weak,the"LOBAT"indication

appears on the LCD to warn

the operator that the display

will be shut-off after about 4 hours of use to

preventerroneousreadingsduetolowvoltage.

Battery replacement must only take place in a

safe area using 1.5V AA alkaline batteries.

In order to replace the

batteries,simplyremove

the two screws on the

rear cover of the instru-

mentandreplaceallfour

batterieswithnewones,

whilepayingattentionto

the correct polarity.

A 12 Vdc power source can also be used to

power the unit. Simply unscrew the protective

cap on the top of the instrument and plug the

poweradapter into the socket.

Note: The instrument uses the following con-

figuration.

Use the HANNA adapters (such as HI 710005

orHI710006)withproperpolarityconfiguration.

HI 9143 and HI 9145 can also run on other

adapters.Inthiscase,checkthecorrectpolar-

ity of the adapter before connecting it to the

meter.

ACCESSORIES

HI76407/4 DOprobewith4 m (13') cable

HI76407/10 DOprobewith10m(33')cable

HI76407/20 DOprobewith20m(66')cable

HI7041S Refilling electrolyte solution,

30 mL

HI76407A/P SpareDOmembrane(5pcs)

HI710005 115 Vac/12 Vdc adapter, US

plug

HI710006 230 Vac/12 Vdc adapter, Eu-

ropeanplug

HI710012 240 Vac/12 Vdc adapter, UK

plug

HI710013 230 Vac/12Vdcadapter,South

Africanplug

HI710014 230 Vac/12Vdcadapter,Aus-

tralianplug

LOBAT

SAMPLE

°C

ppm

18 19

CE DECLARATION OF CONFORMITY

Recommendations for Users

Before using these products, make sure that they are entirely

suitable for the environment in which they are used.

Operation of this instrument in residential area could cause

unacceptableinterferencetoradioandTVequipment,requiringthe

operator to take all necessary steps to correct interferences.

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

voltage at the measurement surface exceeds 24 Vac or 60 Vdc.

To avoid damage or burns, do not perform any measurement in

microwave ovens.

WARRANTY

All Hanna meters are warranted for two

years against defects in workmanship and

materials when used for their intended pur-

poseand maintainedaccording to the instruc-

tions.

Probes are warranted for six months.

Thiswarrantyislimitedtorepairorreplacement

freeofcharge.

Damagesduetoaccidents,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

failure. If the repair is not covered by the

warranty, you will be notified of the charge for

repair or replacement.

If the instrument is to be returned to Hanna

Instruments, please obtain a Return Goods

Authorization from the Customer Service De-

partment and then send it with shipment cost

prepaid.Whenshippinganyinstrument,make

sure it is properly packaged for complete pro-

tection.

All rights are reserved. Reproduction in whole

or in part is prohibited without the written con-

sentofthecopyrightowner.

Hanna Instruments reserves the right to modify

the design, construction and appearance of its

products without advance notice.

This manual suits for next models

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