Extech Instruments EC170

8 EC170-EU-EN V1.1 7/13
Calibration
CalibrationPreparationandConsiderations
Theusermustfirstdetermine:
1.Thebestcalibrationschedulefortheapplicationathand.
2.Whatcalibrationstandardtouse.

CalibrationSchedule
 Calibrationisnecessaryandshouldbeperformedregularly.
 Ifmeasuringinthemid‐rangescalibratethemeteratleastoncepermonthandsoakthe
probedeionizedorfor15minutesbeforeeachuse.
 Ifmeasuringinextremetemperatureenvironments,oratthelowendof
themeasurement
range,calibratethemeteratleastonceperweek.

SelectingaCalibrationStandard
Forbestresultsselectacalibrationstandardclosesttotheexpectedsamplevalue.
Alternatively,useacalibrationsolutionvaluethatisapproximately2/3oftheexpectedfull
scalemeasurementrange.Remembernottore‐usecalibrationsolutions;contaminantsinthe
solutionwillaffectthecalibrationandtheaccuracy.

SalinityCalibrationProcedure
1. Inserttheprobeintodeionizedordistilledwaterforapproximately30minutestorinsethe
probe.
2. SelecttheSodiumChloridestandardthatisclosesttothe expectedmeasurementrange.
3. Filltwoseparateandcleansamplecupswiththestandardizingsolutiontoadepthofat
least3cm(1.2”)each.
4. SwitchthemeterON.
5. Rinsetheprobeinoneofthesamplecupsolutions,gentlystirringtheprobe.Rinsingcould
removecontaminantsthatcouldaffectcalibrationandcausemeasurementerrors.
6. Diptherinsedprobeintotheothersamplecupsolution.Tapor
movetheelectrodeinthe
sampletodislodgeairbubbles.Lettheprobestabilizetothesolutiontemperature.
7. PressandholdtheHOLD/CALbutton(approximately2seconds)untilthesalinityvalueand
the‘CAL’iconbeginflashingontheLCD.
8. Usethearrowbuttonstoadjustthedisplayed
valuetomatchthevalueofthestandard
solution.TheSalinityreadingcanbeadjusted±30%fromthedetectedvalue.Values
differingmorethan±30%fromthedetectedvalueindicatesthattheelectrodeneedstobe
cleaned.
9. WhentheCALiconstopsflashing,presstheSETbuttonmomentarilytoconfirmthevalue.
Themeterwillthenreturntothenormalmeasurementmode.
10. NotethatincaseswheretheSalinityreadingisoutsidethe±30%window,themeterdisplay
mayfreezeandnotallowtheusertoreturntothenormaloperatingmode.Inthiscase,
removeoneofthe
batteriestoswitchthemeterOFFanddonotusethemeteragainuntil
theelectrodehasbeencleanedorreplaced.
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