YEO-KAL 620 User manual






Yeo-Kal Electronics Pty Ltd 18/26 Wattle Road, Brookvale NSW Australia
Telephone [phone] Fax [phone]


USERMANUAL
Model 620WaterQualityDataLogger

Version 1.3
Date 1/5/2019

InformationinthisdocumentisthecopyrightofYEO‐KALElectronicsPtyLtdandissubject
tochangewithoutnotice.Nopartofthisdocumentmaybecopiedorreproducedbyany
meanswithouttheexpresswrittenpermissionofYEO‐KALElectronicsPtyLtd.All
trademarksarethepropertyoftheirrespectivecompanies.
©2014Yeo‐KalElectronicsPtyLtd



WARNINGS
DEPLOYMENTWARNING:
Alwaysremembertotightenthecaponthetopbeforedeploymentotherwisethemodel620is
notbewatertight!
EXPLOSIONWARNING:
Inaparticularcombinationofcircumstanceswheresaltwatercomesintocontactwithbatteries
anexplosionmayresult.Iftheprobeisdamageandwateringressispossibletheprobeshouldbe
keptdryandreturnedtoYeo‐KalElectronicstoberepaired.
SCREWCAPS:
When/ifdeployingtheprobewiththecabledisconnecteditisimportanttoinstallthescrewcap
onthetopconnector.Tightenfirmlyforo‐ringseal‐overtighteningwillnotimprovethesealand
mayweakenitandmakeithardtounscrew!
Iftheprobeisfittedwithauxiliarysensorsensurethecablefromtheexternalsensorisscrewed
tight.



Contents
WARNINGS....................................................................................2
AVIATIONWARNING(FORLITHIUMIONBATTERIESONLY):ERROR!BOOKMARKNOTDEFINED.
CHARGINGWARNING:................................ERROR!BOOKMARKNOTDEFINED.
DEPLOYMENTWARNING:.........................................................................2
EXPLOSIONWARNING:.............................................................................2
SCREWCAPS:............................................................................................2
CONTENTS.....................................................................................3
INTRODUCTION.............................................................................6
GENERALDESCRIPTION..................................................................................6
SPECIFICATIONS............................................................................................6
Sensors:................................................................................................7
Temperature.........................................................................................7
Conductivity..........................................................................................7
Salinity..................................................................................................7
DissolvedOxygen..................................................................................7
Turbidity...............................................................................................7
pH.........................................................................................................8
ORP.......................................................................................................8
Depth(optional)...................................................................................8
Auxiliaryinputs.....................................................................................8
Physical.................................................................................................8
DESCRIPTIONOFSENSORS...............................................................................9
TemperatureSensor...........................................................................10
DissolvedOxygenSensor....................................................................10
ConductivitySensor............................................................................10
TurbiditySensor.................................................................................10
PH/ORPSensor...................................................................................11
pH‐Standardnon‐fillable:.................................................................11
pH‐Optionalrefillable:......................................................................11
AuxiliarySensors.................................................................................11
AuxiliarySensorElectricalCharacteristics:.........................................11
AuxiliarySensorwaterproofcap:.......................................................11
MAINTENANCE............................................................................12
D.O.SENSORMAINTENANCE........................................................................12
ChangingtheMembrane....................................................................12
DissolvedOxygenStirrerMaintenance..............................................13
PH/ORPSENSORMAINTENANCE...................................................................13
TURBIDITYSENSORMAINTENANCE.................................................................14
CONDUCTIVITYSENSORMAINTENANCE...........................................................14
BATTERY......................................................................................16


NICKLEMETALHYDRIDEBATTERIES................................................................16
Howtocharge:.......................................Error!Bookmarknotdefined.
NickelMetalHydridebatterychargerstatusError!Bookmarknotdefined.
LITHIUMIONBATTERIES...............................................................................16
WARNINGS:........................................................................................16
Lithiumionbatteryspecification:...........Error!Bookmarknotdefined.
Description:............................................Error!Bookmarknotdefined.
Gettingtothebatterypack:...............................................................17
Howtocharge:.......................................Error!Bookmarknotdefined.
InstallBattery:....................................................................................17
CONNECTING...............................................................................19
CONNECTINGTOTHEPC...............................................................................19
COMMUNICATIONSPECIFICATION:..................................................................19
COMMUNICATIONSOFTWARE.......................................................................19
CHECKLOGGER:..........................................................................................20
SETLOGGER:..............................................................................................21
Enableisolation:.................................................................................21
Enablecyclicmemory:........................................................................21
Clearmemory:....................................................................................21
ArmLoggerbutton:............................................................................21
Disarmbutton:...................................................................................21
DOWNLOADDATA:.....................................................................................22
DownloadDatabutton:......................................................................22
Cancelbutton:....................................................................................22
REALTIME:................................................................................................23
Startbutton:.......................................................................................23
Stopbutton:.......................................................................................23
OutputRawData:...............................................................................23
EnableIsolation:.................................................................................23
CALIBRATION:.............................................................................................24
Parameterbutton:..............................................................................24
CalibrateLow/HighPoint:.................................................................24
Showlastdig:......................................................................................24
Hold:...................................................................................................24
CalibrateandSave:.............................................................................24
Cancel:................................................................................................24
Recalculate:........................................................................................24
SendCalibrationtoprobe:..................................................................24
ClearCalConst:...................................................................................25
ReloadCalConstants:.........................................................................25
StopProbe:.........................................................................................25
StartProbe:........................................................................................25
UploadCalConst:...............................................................................25
SaveCalConst:...................................................................................25
CALIBRATIONOVERVIEW..............................................................................25


TemperatureCalibration....................................................................25
Salinity/HighConductivityRange(ms/cm)Calibration.......................26
LowConductivityRange(us/cm)Calibration......................................26
DissolvedOxygencalibration..............................................................27
pHCalibration.....................................................................................27
ORPCalibration..................................................................................27
TurbidityCalibration...........................................................................28
Depthcalibration................................................................................28
AuxiliaryChannelCalibration.............................................................28
LOGGERSETTINGS.......................................................................................29
Updateclockwhenarming:................................................................29
Realtimesamplerate:........................................................................29
Downloaddatainprocessed:.............................................................29
Lowbatteryshutoff:..........................................................................29
Batteryvoltagecalibration:................................................................29
Warmuptime:...................................................................................29
SensorCount:.....................................................................................29
SetAltitude:........................................................................................29
ADVANCEDSETTINGS:..................................................................................30
Edit>Commsportsetting:.................................................................30
Edit>WindowsDeviceManager:.......................................................30
Edit>ChannelDisplay/Precision/Chart:.............................................31
STORAGE.....................................................................................32
APPENDIX1‐CONVERSIONSUSED..............................................33
APPENDIX2‐COMPLIANCE.........................................................34



Introduction
Themodel620comesalreadyassembled.Theonlyassemblyisconnectingtheloggertothebattery
chargerortothePCbycablesupplied.
GeneralDescription
Themodel620isafullysubmersiblewaterqualitydataloggerdesignedforunattended
deployment.Theunitisanidealtoolforlongtermdeploymentwhereaccuracyandreliabilityare
required‐canbeusedinawidevarietyofapplicationincludingwaterways,boreholes,sea,dams
andponds.ThemachinedPVCandstainlesssteelassemblymakesthisdataloggertoughand
durable.
Theinstrumentconsistsofamulti‐sensorprobewhichhasinternalmemoryandbatteriessoitcan
bothstoredataandoutputinrealtime.Communicationtoandfromtheprobeisinhalfduplex
serialwheredataistransferredtothePCusingserialcommunicationsgivingreliable,interference
freemeasurementsandalsocommandsaresenttotheloggerusingthesameinterface.Commands
sentanddatareceivedarehandledbytheaccompanyingPCWindows®software.Thecalibration
routineisalsohandledwiththesoftware.
Themodel620comeswithstoragecontainertoprotectthesensorswhiletheinstrumentisin
storage.
Specifications
Memory: Nonvolatilememoryforfullcapacityof20800samples.
ADCbits: 18bit
SampleRate: Loggingfrom1per10seconds
 Realtime:8sensors‐1persecondor12sensors1per2seconds(approximate
times)
Communications: Baudrate9600,8databits,Noparity,1stopbits(8‐N‐1)(baudof4800
 availableinsettings)
Power: Nickelmetalhydridepackwith4500mAHor
 Lithiumionbatterypackwithcapacityof3520mAH
Material: MachinedgreyPVCandstainlesssteel
Dimensions: 511mmX68mmdiameter.Suspensionbracketmakesdiameter82mm.
Weight: 2kg



Sensors:
Temperature
Range: ‐2–50oC
Accuracy: ±0.05oC
Resolution: 0.01oC(0.001oCpossiblethroughsettings)
Type: pt100platinumelement
Conductivity
HighRange: 0‐80ms/cm(noteuselowrangeforlowvalues)
Accuracy: ±0.05ms/cm
Resolution: 0.02ms/cm
LowRange: 0‐8000us/cm
Accuracy: ±5us/cm
Resolution: 1us/cm
Type: Fourelectrodecell
Salinity
Range: 0‐60ppt
Accuracy: ±0.05ppt
Resolution: 0.02ppt
Type: SeeAppendix1‐ConversionsUsed
DissolvedOxygen
Range: 0‐200%saturation
 0‐20mg/l
Accuracy: ±0.5%
Resolution: 0.1%
Type: ActivesilverandleadelectrodesensorwithPTFE*membraneandbuilt‐in
stirrer
Turbidity
Range: 0‐600ntu
Accuracy: ±0.5ntu(0‐300nturange)
 ±5ntu(300‐600nturange)
Resolution: 0.3ntu
Type: Nephelometricmeasurementfroma90°sensorwithpulsedinfra‐redlight
source



pH
Range: 0‐14
Accuracy: ±0.03
Resolution: 0.01
Type: Combinationsilver/silverchloridetypewithsinteredTeflon*junction
ORP
Range: ‐700mVto+1100mV
Accuracy: ±10mV
Resolution: 1mV
Type: CombinationbaremetalelectrodecommonreferencejunctionwithpH
electrode(seeAppendix1‐ConversionsUsed)
Depth(optional)
Range: 0‐100mor
 0‐150m
Accuracy: ±0.5%offullscale
Resolution: 0.1m
Type: Dualactivesiliconestraingauge
Auxiliaryinputs
Input: 4X0‐5voltseachinput
Physical
Cablelength: 5m.Otherlengthsmadetoorder.



DescriptionofSensors
Theprobeassemblyconsistsofthepivotingsuspensionbracket,cableconnector,probebody,top
sensorhousing,slidingsensorguardandbottomsensorhousing.Thebodyoftheprobeismadeof
PVCwithaPVCsensorguard.
Thesensorscaneasilybeaccessedbyslidingthesensorguardupandrotatingthebottomsection
oftheprobe.
Theconductivityanddissolvedoxygensensorscanberemovedforservicing.However,thewhole
unitmustbethoroughlydrybeforethesesensorsareremovedtostrictlyavoidgettingmoisterin
thesockets.Acottonbudorpapertowelcanbeusedtodrythespacesinbetweenthesensors.


Expandedviewofsensorswithdissolvedoxygensensordetached.


TemperatureSensor
Thetemperaturesensorconsistsofapt100platinumelement,housedinastainlesssteelsheath
forrobustnessandcorrosionresistance.Thetemperaturesensorrequireslittlemaintenance,
howeverthetemperaturemeasurementisusedforcalculatingthedissolvedoxygeninmg/landfor
temperaturecorrectionoftheconductivitysensor,soitisimportantthatthetemperaturesensoris
properlycalibrated.
DissolvedOxygenSensor
DissolvedOxygenismeasuredusinganactivetypemembranecoveredsensor.Thesensoritself
consistsofsilverandleadelectrodesanda25umPTFEmembraneandisfilledwitha1.0M
potassiumhydroxide.Aconstantflowofwaterpassesthesensor,maintainedbyastirrerlocated
onthebottomsectionoftheprobe.
Whenthesilverandleadelectrodesareconnectedthroughtheexternalcircuit,electronspassfrom
theleadelectrodetothesilverelectrode.Whenoxygenispresentatthesurfaceofthesilver
electrode,itreactswithelectronstoproducehydroxylions.
Attheleadelectrodethelossofelectronsproducesleadions.Thelead'selectronscombinewith
hydroxyltoprecipitateleadhydroxideontheleadelectrode.
Therateoftransferenceofelectronsviatheexternalcircuitfromtheleadtosilverelectrodeiethat
isthecurrentflowingintheexternalcircuit,isthemeasureoftherateofcellreactionandthusthe
rateatwhichoxygenreachesthesilverelectrode.Thecurrentflowingintheexternalcircuitis
directlyrelatedtotheoxygenconcentrationinthesamplebeingmeasuredbytheelectrodes.
TheDissolvedOxygensensormayperiodicallyrequireanewmembraneandelectrolyte.Aunique
knurlednutisusedtoholdthesensormembraneinpositionwithoutoverstressingthemembrane.
Thisgiveslongtermstabilityandallowseasyreplacement.Thesensorcanberemovedfromthe
probeforservicing.Areplacementprobeisreadyforuseimmediatelyafterinstallationand
calibration.
ConductivitySensor
Theconductivityismeasuredusinga4electrodebridge.Thefourelectrodesystemusesautomatic
compensationtoovercomeanybuildupofcontaminationontheelectrodes.Theelectrodesare
madefromfineplatinumandarecoatedwithplatinumblacktoenhancethelongtermstabilityand
sensitivityofthesensor.Thecoatingshouldlastforalongperiodoftimeifitisnotmechanically
removed,however,thecoatingcanbereplacedbyreturningthesensortoYEO‐KALElectronicsPty
Ltd.
TurbiditySensor
Theturbiditysensorislocatedintheholewhichrunsthroughthebottomsectionoftheprobeand
islinedwithaglasstube.Turbidityismeasuredbythenephelometricmethodwhichusesalight
sourceandadetectormeasuringthelightscatteredat90degreestotheincidentlightbeam.A
pulsedinfra‐redlightsourceisused.ATurbidityscreenhasalsobeeninstalledwhichhasapertures
toreducebounceofftheglasswallandremoverefractionfromsampleshighdensity(seawater).
