Extech Instruments PH90 User manual

USERMANUAL
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
WaterproofpH/TemperatureMeter
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ModelPH90
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PH90‐en‐GB_V1.46/16
2
Introduction
ThankyouforselectingtheExtechModelPH90waterproofpH/Temperaturemeter.This
instrumentisequippedwithaflatsurfacepHelectrode(modelpH95)forreliabletestresults.
Thisdeviceisshippedfullytestedandcalibratedand,withproperuse,willprovideyearsof
reliableservice.Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversionofthis
UserGuide,ProductUpdates,ProductRegistration,andCustomerSupport.
Features
Rugged,replaceable,flatsurfacepHelectrode(pH95)forquickpHmeasurements
LCDdisplayshowspHandtemperaturemeasurementssimultaneously
Calibrationautomaticallyrecognizesbuffersolution
PTS(percentofslope)featurealertsuserwhenelectrodereplacementisnecessary
ATC(automatictemperaturecompensation)
Waterproofdesign(IP57);metercanfloatinwater
Autopoweroffafter10minutesofinactivity
EasytoreplacepHelectrode
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PH90‐en‐GB_V1.46/16
3
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Description
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1. Batterycompartmentcap
2. LCDDisplay
3. PowerandCALbutton
4. HOLDandMAX/MINbutton
5. °C/°Fbutton
6. Electrodecollar
7. Electrode(PN:PH95;replaceable)
CAUTIONS
Thisdevicecontainssmallobjectsthatcanbeswallowed;donotallowchildrenorpetsto
handleorplaywiththisdevice.
Donotallowchildrenorpetstohandleorplaywiththebatteriesandpackingmaterial,
theseitemsposeahazard.
Ifthisdeviceistobestoredunusedforanextendedperiodoftime,removethebatteries.
Expiredordamagedbatteriescancausecauterizationoncontactwithskin.Alwaysuse
suitablehandprotection.
Pleaseensurethatthebatteriesarenotshort‐circuited.
Donotdisposeofbatteriesinafire.
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PH90‐en‐GB_V1.46/16
4
Overview
pHOverview
pHisaunitofmeasure(rangingfrom0to14pH)indicatingthedegreeofacidityoralkalinityofa
solution.SolutionswithapHlowerthan7areconsideredacidic,solutionswithapHhigherthan
7areknownasbases,andsolutionswithapHofexactly7areconsidered‘neutral’.
ThepHscaleislogarithmicso,forexample,ifsample‘A’is1pHlowerthanSample‘B’,then
Sample‘A’is10timesmoreacidicthanSampleB.Adifferenceof1pHrepresentsaten‐fold
differenceinacidity.
GettingStarted
Fornewmeters,removethebatterycap(1)atthetopofthemeterandinstall2batteries
observingcorrectpolarity.
Removethecapfromthebottomoftheinstrument(7)toexposetheflatsurfaceelectrodeand
referencejunction.
Beforefirstuse,rinsetheelectrodewithcleantapwaterandwipedry.
Thespongeshouldbekeptmoistenedatalltimestoensureaccuracy.
ReplacingElectrodes
ThePH90isshippedwithaflatsurfacepHelectrodeattached(7).Electrodelifeislimited,andis
dependenton(amongotherfactors)frequencyofuseandcare.Iftheelectrodeneedstobe
replaced,followthesestepsforremovingandconnectingelectrodes.ReplacementpH
electrodes(partnumberpH95)areavailablefromExtechInstruments.
1. Unscrewtheelectrodecollar(6)clockwise,andremoveitcompletely.
2. PullthepHelectrodemoduleoutfromthetester.
3. Carefully,pluganewelectrodemoduleintothetestersocket.
4. Replaceandtightentheelectrodecollartoensureagoodseal.
AutomaticElectrodeRecognition
Whenthemeterispowered,itrecognizesthetypeofelectrodethatisconnectedanddisplays
theappropriateunitofmeasure.Attachtheelectrodebeforepoweringthemeter;neverpower
themeterwithoutanelectrodeattached.
PoweringtheMeter
Thebatteriesarealreadyinstalledinthemeter.Pressthepowerbutton(3)topowerONorOFF.
Thedisplayedbatteryindicatorletstheuserknowthestatusofthebatterystrength.TheAuto
Powerofffeatureshutsthemeteroffautomaticallyafter10minutesofinactivitytopreserve
batterylife.
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PH90‐en‐GB_V1.46/16
5
Operation
UnderstandingthePH90Display
Whenanelectrodeisplacedinasolution,themaindisplayindicatesthepHreadingwhilethe
lowerdisplayshowstemperature.
pHCalibration
Atwopointcalibrationwithabufferof7and4or10(whicheverisnearesttotheexpected
samplevalue)isalwaysrecommended.Forbestaccuracy,alwayscalibrateatthesample
temperature.
1. CheckthatthepHiconisdisplayedontheLCD.
2. DiptheelectrodeintothepH7buffersolution.Stirgentlyandwaitforastablereading.
3. PressandholdtheCALbutton(3)toentercalibrationmode.
4. TheLCDwilldisplaytheCALiconandthenflash7.00.
5. WhencalibrationiscompletethemeterwillstopflashingandindicateSAandEND.
6. Rinsetheelectrodewithcleantapwaterandwipedry.
7. DiptheelectrodeinpH4(orpH10)buffersolution.
8. Stirgentlyandwaituntilthedisplayisstable.
9. PressandholdtheCALbuttontoentercalibrationmode.
10. TheLCDwilldisplaytheCALiconandthenflash4.00or10.00.
11. Whencalibrationiscompletethemeterwillstopflashingandindicate%(percentofslope),
SAandEND.
12. AfterthecalibrationofpH4orpH10,thedisplaywillindicatetheslopepercentage(PTS),
indicatingthestatusoftheelectrode.
13. IfthePTSis<70%or>130%theelectrodemustbereplaced.Aslopeof100%isideal.
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Note:TheSAiconwillnotappearifthecalibrationfails.
Note:CalibratewithapH7bufferfirstandthenfollowwithapH4orpH10calibration.
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PH90‐en‐GB_V1.46/16
6
pHMeasurements
Aftercalibration(detailedearlier),rinsetheelectrodewithcleantapwaterandwipedry.Dipthe
electrodeintothesamplesolutiontobemeasured.Stirgentlyandwaitforastablereading.
AutomatictemperaturecompensationisalwaysactivewhenmeasuringpH(ATCiconshownon
LCD).
TemperatureUnitsSelection(oC/oF)
PressandholdtheC/Fbuttontotogglethedisplayedtemperatureunitsofmeasure.
DataHold
MomentarilypresstheHOLD/MAX‐MINbutton(4)toentertheHOLDmode;thedisplayed
readingwillfreeze.TheiconHOLDwillbedisplayedontheLCDwhileinthismode.Pressthis
buttonagaintoexittheDataHoldmodeandreturntothemeasurementmode.TheHOLDicon
willdisappearandthereadingwillreturntothereal‐timevalue.
MAX/MIN
PressandholdtheHOLD/MAXMINbutton(4)untiltheMAXorMINiconflashesonthedisplay.
MomentarypressesofthisbuttonwillnowtoggletheMAX(highestreadingshown)andMIN
(lowestreadingshown)modes.PressandholdthisbuttontoexittheMAX/MINmodeand
returntothemeasurementmode(theMAX/MINiconswilldisappear).Notethatthemeterwill
notAutoPowerOFFwhileintheMAX/MINmode.
FactoryDefaultRESETProcedure
Torestorethemetertothefactorydefaultsettings,poweronthemeterandpressandhold
thesetwobuttons whilepoweringthemeterOFF.
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PH90‐en‐GB_V1.46/16
7
BatteryReplacement
1. Unscrewthebatterycompartmentcapcounterclockwisetoaccessthebatterycompartment.
2. Replacethetwo(2)2032batteriesobservingcorrectpolarity.
3. Replacethebatterycompartmentcapsecurely.


Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.
Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriatecollectionsites,the
retailstorewherethebatterieswerepurchased,orwhereverbatteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedtotakeend‐
of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronic
equipment.
Specifications
DisplaypHTemp
Range0to14.00pH0to90.0°C
(32to194°F)
Accuracy±(0.01pH+1dgt) ±0.5°C+1dgt
(±0.9°F+1dgt)
Resolution0.01pH0.1°F/C
ATC
(Autotemperature
compensation)
0to90°C
(32to194°F)n/a
CalibrationpointspH4.00,7.00,and10.00
Power2x3VLithiumbatteries(CR2032)
Dimensions36x170x36mm(1.4x6.7x1.4”)
Weight85g(3oz.)
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Copyright©2015‐2016FLIRSystems,Inc.
Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform
ISO‐9001Certified
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