Selecta PH-3005 - Page 27

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Table5‐5Charactersdisplayedonthecalibrationoperationinterface
No. Characterdisplay Explanation
1 Auto
Displaywhenthestandardsolutionisautomaticallyidentified,indicatingAutoRecognition.
2 Non
Displaywhenthestandardsolutionismanuallyidentified,indicatingManualRecognition.
3 Err Displaywhencalibrationfails,indicatingError.
4 OH
Displaywhentheconfirmationisvalidduringcalibration,indicatingOK.
5 End Displaywhencalibrationiscompleted.
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Themetersupportsautomaticidentificationofstandardbuffersolutions,andcanidentifythreestandardsolutionsof
4.01pH,7.00pH,and10.01pH.UserscanrefertotheappendixtopreparepHstandardbuffersolution,orpurchasemarket
standardbuffersolutions.
Prepare1‐3standardbuffersanddeionizedwaterasrequiredto startcalibration.Thecalibrationstepsareasfollows
(forreference):
1) In the measurement state, press the "Cal/Enter" key to enter the electrodecalibrationstate(thedefaultis
automaticidentificationmode,theword"Auto"isdisplayed).
2) WashthepHelectroderepeatedlywithdistilledwater,putitinacertainstandardbuffersolution(suchas7.00pH
standardbuffersolution),theinstrumentdisplayspHvalueandtemperaturevalue(suchas7.00pH,25.0°C).
3) If the meter is not connected to a temperature electrode, you need to use a thermometer to measure the
temperaturevalueofthestandardsolution,pressthe"Setting"keyandsetthecurrenttemperaturevalue(such
as25.2°C)withtheupanddownkey,andpressthe"Cal/Enter"keytocompletethetemperaturevalueinput.
4) Waitforthereadingtostabilize,pressthe"Cal/Enter"key,andthemeterstoresthecalibrationdataanddisplays
thecalibrationresult,thatis,thenominalpHvalueat25.2°C.
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Figure5‐7Calibrationdisplay
5) Whenperformingmulti‐pointcalibration,repeattheprocessabovetocalibratetheremainingcalibrationpoints.
Themetersupportsupto3‐pointcalibration.Whentheuserfinishescalibrating3standardsolutions,themeter
willautomaticallyendthecalibrationandreturntothemeasurementstate.Iftheuseronlyneedstocalibrate1~2
points,youcanmanuallypressthe"Cancel"keytoterminatethecalibration.
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Iftheuserusesanon‐standardpHbuffersolutiontocalibratetheelectrode,theusermustknowtherelationship
betweenthepHvalueofthenon‐standardsolutionandthetemperatureinadvance,thatis,thenominalpHatacertain
temperature,andthencontrolthetemperatureoftheconstanttemperaturetanktomakethestandardsolutionreach
specifiedtemperaturevalue.
Calibrationstepsareasfollows(forreference):
1) Placethestandardsolutioninaconstanttemperaturetank,inwhichthetemperatureiscontrolledtoacertain