Hanna Instruments HI 9142 User manual

Instruction Manual

HI 9142

Portable Waterproof

Dissolved Oxygen Meter

This instrument is in Compliance with the CE Directives

http://www.hannainst.com

PRELIMINARY EXAMINATION

Removetheinstrumentfromthepackingmaterial

andexamineittomakesurethatnodamagehas

occurred during shipping. If there is any

damage, notify your Dealer.

In addition to this manual you should find the

followingitems:

•D.O.meter

•4 x 1.5V AA batteries

•DO Probe (HI 76407/4)

•Membrane cap (HI 76407A)

•Protectivecap

•30 mL electrolyte solution (HI 7041S)

•Rugged carrying case

Note: Save all packing material until you are

sure that the instrument functions

correctly. All defective items must be

returned to us in the original packaging

with the supplied accessories.

GENERAL DESCRIPTION

Hanna Instruments' HI 9142 is a water-resis-

tant, Dissolved Oxygen meter with Automatic

TemperatureCompensation.Ithasbeendevel-

oped for dissolved oxygen measurement in

water and wastewater applications as well as

otherapplicationssuchasfishfarming.

Dissolvedoxygenisindicatedintenthsofparts

per million (ppm=mg/l) .

Four1.5VAAbatteriesprovidepowerandmake

theinstrumentcompletelyportable.

Themeterishousedinaruggedwater-resistant

caseformaximumprotectioninthefieldaswell

as in the laboratory.

Thedissolved oxygenprobehas amembrane

coveringthepolarographicsensorsandabuilt-

DearCustomer,

Thank you for choosing a Hanna Instruments

Product.

Please read this instruction manual carefully

beforeusingthe instrument.

Thismanualwillprovideyouwithalltheneces-

sary information for the correct use of the

instrument, as well as a precise idea of its

versatility in a wide range of applications.

Thisinstrumentisincompliancewith direc-

tivesEN50081-1and50082-1.

TABLE OF CONTENTS

PreliminaryExamination ............................. 1

GeneralDescription..................................... 1

FunctionalDescriptionProbe ...................... 2

FunctionalDescriptionMeter....................... 3

Specifications ............................................. 4

InitialProbePreparation .............................. 5

CalibrationProcedure .................................. 6

TakingMeasurements ................................. 8

AltitudeandSalinityCompensation............. 9

Probe&MembraneMaintenance .............. 11

BatteryReplacement ................................ 13

Accessories .............................................. 14

Warranty ................................................... 15

OtherProductsfromHanna....................... 16

CEDeclarationofConformity .................... 17

ISO 9000 Certified

Companysince1992

FUNCTIONAL DESCRIPTION

1. BatteryCompartment

2. ProbeConnector

3. LiquidCrystalDisplay

4. ON/OFFButton

5. CalibrationButton

6. SlopeCalibrationTrimmer

7. ZeroD.O. CalibrationTrimmer

in thermistor for temperature measurements

and compensation. The thin permeable

membrane isolates the sensor elements from

thetestingsolution,butallowsoxygentoenter.

When a voltage is applied across the sensor,

oxygenthathaspassedthroughthemembrane

reacts causing current to flow, allowing the

determinationofoxygen.

1. D.O.Probe

2. ProtectiveCap

3. Water-tightShieldedCable

4. Polypropylene Probe Body

5. TemperatureSensor

6. O-RingSeal

7. SilverChlorideAnode

8. PlatinumCathode(sensor)

9.OxygenPermeablePTFEMembrane

10.MembraneCap

FUNCTIONAL DESCRIPTION PROBE

INITIAL PROBE PREPARATION

Probe Preparation

All probes shipped from Hanna Instrument

are dry. To hydrate the probe and prepare it

for use, connect it to the meter and proceed

as follows.

1 Remove the red and black plas-

tic cap. This cap is for ship-

ping purposes and can be

thrown away.

2 Wet the sensor by soaking the

bottom 2½ cm (1") of the probe

in electrolyte (HI 7041S) for 5

minutes.

3 Rinse the membrane (HI 76407A supplied

in the kit with the

meter) with elec-

trolyte while

shaking it gen-

tly. Refill with

clean electrolyte.

4 Gently tap the

sides of the

membrane with

your finger tip

to ensure that

no air bubbles

remain trapped.

To avoid dam-

aging the mem-

brane, do not tap the membrane directly on

the bottom.

5 Place rubber O-Ring properly inside the

membrane cap.

6 With the sensor facing down, screw the

cap clockwise. Some electrolyte

will overflow.

When not in use and during polar-

ization, place the protective cap

supplied in the kit with the meter.

hipping

cap

black

red

THEN SCREW

BACK ON

THEN TAP

FILL FIRST

HI9142

Range 0.0 to 19.9 mg/l

Resolution 0.1 mg/l

Accuracy ±1.5% Full Scale

TypicalEMC ±0.8 mg/l

Deviation with 4 m cable probe

Calibration Manual on 2 points

(zeroandslope)

Temperature Automatic from 0 to 30°C

Compensation (32to86°F)

Probe HI76407/4polarographic

with 4 m cable

Battery Type 4 x 1.5V AA

Life 500hoursofcontinuoususe

Environment 0 to 50°C (32 to 122°F);

100%RH

Dimensions 196x80x60 mm (7.7x3.1x2.4")

Weight 425 g (15 oz.); kit: 1.4 kg (3.1 lbs)

SPECIFICATIONS

Zero Calibration:

•DiptheprobeintoHI7040zero

oxygensolutionandstirgen-

tly for 2-3 minutes.

•Allow 2 minutes for the LCD readout to

stabilize.

•Adjust the zero D.O. calibration

trimmer until the display reads

"0.0".

Note Thezerocalibrationscrewis

located close to the probe

connector.

Slope Calibration:

Itissuggestedtoperformtheslopecalibration

insaturedair.

•Rinse the probe in a large amount of clean

water to remove any residual zero oxygen

solution.

•Dry the probe tip and allow a few minutes for

theLCDreadouttostabilize.

•Press and hold the CAL key.

•Adjust the slope trimmer on

the top of the meter to read

"100%" on the LCD (while still

holdingtheCALbutton).

NoteTheslopecalibrationscrew

islocatedfarthestfromtheprobe

connection.

•Release the CAL key and the

LCD will display the value in

ppmof oxygen.

The zero calibration of the HI 9142 is very

stable, therefore this procedure needs only to

be performed whenever the probe is re-

placed.

However, because the slope calibration is

more critical, it is recommended to perform

this procedure every week.

CAL

CALIBRATION PROCEDURE

PROBE POLARIZATION

The probe is under polarization with a fixed

voltageofapproximately800mV.

Probepolarizationis essential for stable mea-

surements with the same recurring degree of

accuracy.

With the probe properly polarized, oxygen is

continually"consumed"bypassingthroughthe

sensitivediaphragmanddissolvingintheelec-

trolyte solution contained in the probe.

If this operation is interrupted, the electrolyte

solution continues to be enriched with oxygen

untilitreachesanequilibriumwiththesurround-

ingsolution.

Whenevermeasurementsaretakenwithanon-

polarized probe, the oxygen level revealed is

both that of the tested solution as well as that

presentintheelectrolytesolution.Thisreading

is incorrect

Thecalibrationis very simple and fast.

•Make sure the probe is ready for measure-

ments(see initialpreparation atpage7), i.e.

themembraneisfilledwithelectrolyteandthe

probe is connected to the meter.

•Switchthemeteronbypress-

ing the ON/OFF key

•Foranaccuratecalibration,itisrecommended

that you wait at least 15 minutes to ensure

preciseconditioningoftheprobe.

•Remove the protective cap

fromtheD.O.probe.

ON/OFF

ALTITUDE & SALINITY COMPENSATION

If the sample contains salts or if you are

performing the measurements at a different

altitudethansealevel,thereadoutvaluesmust

be corrected, taking into account the lower

degreeofoxygensolubility.

ALTITUDE COMPENSATION

Allthe readoutsarereferred atsea level,thus

the displayed measurements are higher than

theactual values.Infact, altitude affectsD.O.

concentrationdecreasingitsvalue.Thefollow-

ingtablereportstheoxygensolubilityatvarious

temperaturesandaltitudes,basedonsealevel

barometricpressureof760 mmHg.

°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

1500m

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

1800m

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

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

Altitude, Meters above Sea Level

This gives an idea of the error that can be

introducedatdifferentaltitudesandallowsyou

to calculate the quantity to be subtracted to

correctyourreading.

°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

TAKING MEASUREMENTS

Makesurethemeterhasbeen

calibrated and the protective

cap has been removed. Im-

mersethetipoftheprobeinthe

sampletobetested.

Make sure the temperature sensor is also

immersed.

Foraccuratedissolvedoxygenmeasurements

awatermovementof0.3m/secisrequiredata

minimum. This is to ensure that the oxygen-

depleted membrane surface is constantly re-

plenished. A moving stream will provide ad-

equatecirculation.Toquicklycheckifthewater

speed is sufficient, wait for the reading to

stabilize and then move the D.O. probe. If the

readingisstillstable,themeasurementcondi-

tionsareright,whileifthereadingincreasesthe

watermovementisnotadequate.

Duringfieldmeasurements,thisconditionmay

bemet bymanuallyagitating theprobe.Accu-

ratereadingsarenotpossiblewhiletheliquidis

at rest.

Duringlaboratorymeasurements,theuseof a

magnetic stirrer to ensure a certain velocity in

the fluid is recommended. In this way, errors

duetothediffusionoftheoxygenpresentinthe

air in the solution are reduced to a minimum.

Atalltimes,timenecessaryforthermalequilib-

riumtooccurbetweentheprobeandthesample

mustbeallowed(afewminutesfortemperature

differenceofseveraldegrees).

PROBE & MEMBRANE MAINTENANCE

The oxygen probe body is made of reinforced

plasticfor maximumdurability.

Athermistortemperaturesensorprovidestem-

peraturemeasurementsofthesampletested.It

isalwaysrecommendedthattheprotectivecap

bekeptontheprobewhentheprobeisnotinuse

toprovideprotectionagainstdamageanddirt.

Toreplacethemembraneorrefillwithelectro-

lyte, proceed as follows:

•Removetheprotectivecap

bygentlytwistingandpull-

ing it off the body of the

probe (see fig. 1).

•Unscrew the membrane

by turning it counter-

clock-wise with the other

hand (see fig. 2)

•Wet the sensor by soak-

ingthebottom2½cm(1")

oftheprobeinelectrolyte

(HI7041S)for5minutes.

•Rinsethenewmembrane

(HI76407A)suppliedwith

themeterwithelectrolyte

while shaking it gently.

Refill with clean electro-

lyte.

•Gentlytapthesidesofthe

membrane with your fin-

ger tip to ensure that no

air bubbles remain

trapped. Do no directly

tap the bottom with your

fingerasthiswilldamage

themembrane.

TWIST

AND

PULL

fig. 1

UNSCREW

fig. 2

SALINITY COMPENSATION

The table below shows the influence of salt in

themeasurementofoxygen.

In HI 9142 allthereadoutsarereferredto0g/l

of salinity value. In fact, salinity affects D.O.

concentrationdecreasingits value.

Foryourreferencethetable belowreportsthe

oxygensolubilityatvarioustemperaturesand

salinity. From the table you can calculate the

quantitytobesubtractedtocorrectyourread-

ing.

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

°F

50.0

53.6

57.2

60.8

64.4

68.0

71.6

75.2

78.8

82.4

Salinity (g/l) at Sea Level

BATTERY REPLACEMENT

Whenthebatteryisrundown

"V"isdisplayedontheLiquid

Crystal Display to warn the

user.

Thisistoinformtheuserthatthedisplaywillbe

shut-off after about 4 hours of use to prevent

erroneous measurements being taken due to

lowvoltage.

Battery replacement must only take place in a

non hazardous area using alkaline 1.5 V AA

type batteries.

In order to replace run-down batteries, simply

removethetwoscrewsontherearcoverofthe

instrumentandreplacethefour1.5VAAbatter-

ies with new ones, paying attention to the

correct polarity (refer to #1 in the Functional

Description page 5).

•Make sure that the rubber O-ring is seated

properly inside the membrane cap.

•With the sensor facing down, screw the

membrane cap clock-wise. Some electro-

lytewilloverflow.

The Platinum cathode (#8 in the Functional

Descriptionatpage4)shouldalwaysbebright

and untarnished. If it is tarnished or stained,

which could be due to contact with certain

gasesorextendedusewithalooseordamaged

membrane,thecathodeshouldbecleaned.You

canuseacleanlint-freecardboardorcloth.Rub

thecathodeverygentlysideto side 4-5 times.

This will be enough to polish and remove any

stainswithoutdamagingtheplatinumtip.After-

wards,rinsetheprobewithdeionizedordistilled

water and install a new membrane cap using

fresh electrolyte and follow the steps above.

Recalibratetheinstrument.

Important:inordertohaveaccurateandstable

measurements,itisimportantthatthe surface

of the membrane is in perfect condition. This

semi-permeablemembraneisolatesthesensor

elementsfromtheenvironmentbutallowsoxy-

gen to enter. If any dirt is observed on the

membrane,rinsecarefullywithdistilledordeion-

izedwater.Ifanyimperfectionsstillexist,orany

damageisevident(suchaswrinklesortears-

holes), the membrane should be replaced.

MakesurethattheO-Ringisproperlyseatedin

themembrane cap.

WARRANTY

AllHannaInstrumentsmetersare warranted

fortwoyearsagainstdefectsinworkmanship

and materials when used for their intended

purpose and maintained according to the in-

structions. The probes are warranted for a

period of six months.

Damagesduetoaccidents,misuse,tampering

or lack of prescribed maintenance are not

covered. This warranty is limited to repair or

replacement free of charge.

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

repairorreplacement.Iftheinstrumentistobe

returnedtoHannaInstruments,obtainaReturn

Goods Authorization from the Customer Ser-

vice Department first and then send it with

shipment cost prepaid. When shipping any

instrument, make sure it is properly packaged

forcompleteprotection.

Tovalidateyourwarranty,filloutandreturnthe

enclosedwarrantycardwithin14daysfromthe

date of purchase.

All rights are reserved. Reproduction in whole

or in part is prohibited without the written

consent of the copyright owner.

HannaInstrumentsreservestherighttomodify

thedesign,constructionandappearanceofits

productswithoutadvancenotice.

ACCESSORIES

HI7040M ZeroOxygencalibrationso-

lution,230 mL

HI7040L ZeroOxygen calibrationso-

lution,460 mL

HI7041S RefillingElectrolytesolution,

30 mL

HI721308 1.5VAAsizealkalinebattery

(10pcs)

HI76407/10 Spare probe with 10 meters

(33') cable

HI76407/20 Spare probe with 20 meters

(66') cable

HI76407A/P Sparemembrane(5pcs)

MAN9142R1 Instructionmanual

CE DECLARATION OF CONFORMITY

RecommendationsforUsers

Before using this product, make sure that it is entirely suitable for the environment

in which it is used.

Operation of this instrument in residential area could cause unacceptable interfer-

ences to radio and TV equipments, requiring the 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 this instrument when voltages at the measure-

ment surface exceed 24VAC or 60 VDC.

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

In particular cases the meter could turn off. In these cases it can be turned on by

pressing the ON/OFF key.

•CALIBRATION AND MAINTENANCE

SOLUTIONS

•CHEMICAL TEST KITS

•CHLORINE METERS

•CONDUCTIVITY/TDS METERS

•DISSOLVED OXYGEN METERS

•HYGROMETERS

•ION SPECIFIC METERS (Colorimeters)

•MAGNETIC STIRRERS

•pH/Na/NaCl METERS

•pH/ORP/Na ELECTRODES

•PROBES (DO, µS/cm, RH, T, TDS)

•PUMPS

•REAGENTS

•SOFTWARE

•THERMOMETERS

•TITRATORS

•TRANSMITTERS

•TURBIDITY METERS

•Wide Range of Accessories

Most Hanna meters are available in the fol-

lowing formats:

•BENCH-TOP METERS

•POCKET-SIZED METERS

•PORTABLE METERS

•PRINTING/LOGGING METERS

•PROCESS METERS (Panel and Wall-

mounted)

•WATERPROOF METERS

•METERS FOR FOOD INDUSTRY

For additional information, contact your dealer

or the nearest Hanna Customer Service Cen-

ter. You can also e-mail us at:

[email protected].

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