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

23
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

45
FUNCTIONAL DESCRIPTION - PROBE
9
1
3
4
4
5
6
7
8
9
2
10
8
7
6
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
85
9
67
23
24
4
19
20
21
22
3
210
SAMPLE
LOBAT
SAMPLE
HOLD
CAL F1
F2
HOLD
ppm
ppm
%
°C
°C
1
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.

67
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

89
• 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
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
F1
or or
SAMPLE
F2
ppm
°C
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
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
10
12
14
16
18
20
22
24
26
28
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.