PH Sensor Calibration Procedure

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PH Sensor Calibration Procedure

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<ul><li><p>2/20/2016 pHsensorcalibrationprocedure|InstrumentationTools</p><p>http://instrumentationtools.com/phsensorcalibrationprocedure/ 1/2</p><p>INSTRUMENTATION TOOLS</p><p>pH sensor calibration procedureCalibration May13,2015</p><p>A pH meter calibration is performed by measuring a series of referencestandards, socalled pH buffers that have known and accurate pH values atdifferenttemperatures.Choose the appropriate buffered standards that will bracket the expectedvaluesatthesamplinglocations.IfthewaterbodyspHisunknown,thenthreestandardsareneededfor thecalibration:oneclosetoseven,oneat least twopH units below seven, and the other at least two pH units above seven.Instrumentsthatwillnotaccept threestandardswillneedtoberecalibratedifthesamplespHisoutsidetheinitialcalibrationrange.</p><p>pHSensorcalibrationCalibrationProcedure:1.Allowthebufferedstandardstoequilibratetotheambienttemperature.2.Fillcalibrationcontainerswith thebufferedstandardssoeachstandardwillcoverthepHprobeandtemperaturesensor.3.Removeprobe from its storage container, rinse with deionized water, andremoveexcesswater.4.Selectmeasurementmode.Immerseprobeintotheinitialstandard(e.g.,pH7bufferedsolution).5.Wait until the readings stabilize. If the reading does not change within 30seconds, select calibration mode and then select pH. Enter the buffered</p></li><li><p>2/20/2016 pHsensorcalibrationprocedure|InstrumentationTools</p><p>http://instrumentationtools.com/phsensorcalibrationprocedure/ 2/2</p><p>standardvalueintoinstrument.6. Remove probe from the initial standard, rinse with deionized water, andremoveexcesswater.7. Immerse probe into the second standard (e.g., pH 4 buffered solution).Repeatstep5.8.Removeprobe from the second standard, rinse with deionized water, andremoveexcesswater.Ifinstrumentonlyacceptstwostandards, thecalibrationiscomplete.GotostepII.Otherwisecontinue..9.Immerseprobeinthirdbufferedstandard(e.g.,pH10bufferedsolution)andrepeatstep5.10. Remove probe from the third standard, rinse with deionized water, andremoveexcesswater.11.Selectmeasurementmode,ifnotalreadyselected.Toensurethattheinitialcalibrationstandard(e.g.,pH7)hasnotchanged, immerse theprobe into theinitialstandard.Waitforthereadingstostabilize.Thereadingshouldreadtheinitialstandardvaluewithinthemanufacturersspecifications.Ifnot,recalibratetheinstrument.Ifrecalibrationdoesnothelp,thecalibrationrangemaybetoogreat.Reducecalibrationrangebyusingstandardsthatareclosertogether.12.Thecalibrationiscomplete.Rinsetheprobewithdeionizedwaterandstoretheprobeaccordingtomanufacturersinstructions.13.Recordthecalibrationinformationonthecalibrationlogsheet.</p><p>POSTED BY S BHARADWAJ REDDYInstrumentationProfessionalWorkinginareputedOil&amp;GasCompany.</p></li></ul>