Extech Instruments 341350A Manual

next previous

341350A-EN V1.2 1/14

Conductivity(TDS&Salt)Calibration

Conductivityaccuracyverificationshouldbeperformedonaperiodicbasis.Oncepermonthis

therecommendedcyclefornormaluse.Ifcalibrationisrequired,aconductivitystandardizing

solutionmustbeobtained.Themetercanbecalibratedinanyorallofthethreeranges.

Standardizingsolutionsof84µS/cm,1413µS/cmor12.88mS/cm

(12,880µS/cm)areusedforthe

automaticcalibrationrecognitionprocedure.Noothercalibrationvaluesarepermitted.

Calibrationisalwaysdoneinconductivitymode.SincesalinityandTDSvaluesarecalculated

fromconductivityvalues,thisprocedurealsocalibratestheSalinityand TDSranges.

1. Fillasamplecupwiththestandardizingsolution.

2. TurnthemeterONandinserttheelectrodeintothesolution.Tapormovetheelectrodein

thesampletodislodgeanyairbubbles.

3. PressandholdtheMODE/CALbutton(approximately2seconds)untilthemaindisplay

startsflashing.

4. Themeterwillautomaticallyrecognizeandcalibratetothe

standardizingsolution.Atthe

endofthecalibration,thedisplaywillbrieflyindicate“SA”,“End”andthenreturntothe

measurementmode.

Note:The“SA”willnotappearifthecalibrationfails.

5. The“rangecalibrated”symbolwillappearinthedisplayforeachrangethatiscalibrated

duringthat

poweroncycle.

Lowrange,84µS/cm

Mediumrange,1413µS/cm

Highrange,12.88mS/cm(12,880µS/cm)

Note:Themeterallowsfora1,2or3pointcalibration.Ifcalibrationisdoneformorethanone

point,thelowestvaluestandardshouldbedonefirsttoobtainthebestaccuracy.



ORPCalibration

TheORPelectrodedoesnotrequirecalibration.

Temperature(pHandConductivity)OffsetCalibration

Thisprocedureallowsforerrorcorrectionoftheexternaltemperatureprobe(pH)orthe

conductivityprobe’sbuilt‐intemperaturesensor.

1. SwitchtopHorConductivity(Salt/TDS)mode.

2. Placethetemperatureprobeorconductivitycellinthesampleandallowthetemperature

readingtostabilize.

3. PressandholdtheUNIT/SET

buttonuntiltheºCorºFiconbeginsflashing.

4. Adjustthe▼or▲buttonstosetthedisplaytoindicatetheknowntemperatureofthe

sample.

5. MomentarilypresstheUNIT/SETbuttontosavethechangeandreturntothemeasurement

mode.

