Extech Instruments PH90 User Manual

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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Extech Instruments PH90 Specifications

General

Brand	Extech Instruments
Model	PH90
Category	Measuring Instruments
Language	English