Extech Instruments PH90

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(
o
C/
o
F)
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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