PHS25 pH计说明书.docx

PHS25 pH计说明书.docx

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PHS25pH计说明书

PHS-25PHMETER

OPERATIONMANUAL

CATALOGUE

ⅠBriefIntroduction…………………………………………1

ⅡWorkingPrinciple…………………………………………1

ⅢMainSpecification…………………………………………1

ⅣPanelLayout………………………………………………2

ⅤUsage…………………………………………………………2

ⅥAnalyticalMethod…………………………………………3

ⅦFaultyandRemoval…………………………………………3

ⅧTransportationandStorage………………………………3

ⅨNotes…………………………………………………………4

ⅩTable1………………………………………………………4

ⅪComponentsofDevice…………………………………………4

ⅠBriefIntroduction

AsystemofaglasspHelectrodeandacalomelelectrodehasdifferentdirectpotentialresponsetodifferentacidityinmeasuredsolution.ModelPHS-25pHmeterisaportableanalyzerwith31/2digitalLCDdisplay.Itiswidelyusedinmedicalsanitation,environmentalprotection,agriculture,minefield,teachingandresearchetc.TomeasurepHvalueandpotential（mV）ofwatersolution.

ⅡWorkingprinciple

ModelPHS-25pHmeterworksbasedonthisprinciple.ThatresponseisinputintoadirectcurrentamplifierwhichiswithhighinputimpedanceanddeepnegativefeedbacktomeasurethepHvalueofthesolution.

AglasspHelectrode,acalomelelectrodeandthemeasuredaqueoussolutioncomposeameasuringcell.TherelationshipbetweencellelectromotanceandsolutionpHvalueaccordswithNernst,sEquation:

RT

E=Eo-2.30----pH

F

Where

R,standsforconstant（unit:

8.314J/K.mol）;

T,absolutetemperatureofsolution;

F,Faradayconstant（unit:

9.65×104C/mol）;

E0,theinterceptpotentialoftheelectrodesystem,whichcanbeasaconstantundercertaincondition;

pH,thepHvalueofthemeasuredsolution.

E,cellpotentialproducedbyelectrodesystem.

ⅢMainSpecification

Range:

pH0.0to14.0pH/mV0to±1999mV

Accuracy:

pH0.1pH±1digit/mV4mV±1digit

Resolution:

pH0.1pH/mV4mV

Inputresistanceofelectron:

>5×1011Ω

Inputcurrentofelectronunit:

≤1×10-11A

Rangeoftemperaturecompensation:

0to60℃

Pointofzeropotential:

7.0pH

Workingcondition:

Temperature:

0to40℃Humidity:

≤80%RH

Dimension:

64×185×160mm3

Weight:

600g

Powersupply:

AC220V±22V50HzDC5V（transistorcells）

ⅣPanelLayout

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b.ThispHmetermakesusesofone-pointlocation.Toensuredetectingprecision,selectastandardbuffersolutionwhosepHvalueapproachesthemeasuredsample.Itisexpectedthatthedifferencedoesnotextend3pH.（ⅰ.E.,|pHstandard-pHsolution|<3pH）.

2.Measurementofelectrodepotential（mV）

a.PutthedialbuttoninmVposition.Donotinserttheelectrode.Adjust“Zeroadjust”knobandthedevicedisplays“Zero”.

b.Contacttheelectrodesandputtheminthemeasuredsolution.Thedisplayvalueistheelectrodepotential（mV）aftertheresponseisconstant.

3.MeasurementofpHvalue:

a.Putthebuttonin“pH”position.Adjustthetemperaturecompensationknobaccordingtothetemperatureofthesolution.ContacttheelectrodeandinsertthemintothestandardpHbuffersolution.Adjust“Location”knobtomakedisplaythepHvalueofthestandardbuffersolutionatthistemperature.Thenthestandardizationiscompleted.

b.Removetheelectrodeandfluxwithdistilledwater.Absorbthesurfacewaterwiththefilterpaperandsettheminthemeasuredsolution.ThedisplayispHvalueofthemeasuredsampleaftertheresponseisconstant.

ⅥAnalyticalMethod

1.Preparationofbuffersolution:

Dissolvethe6.86standardbufferreagentin250mlvolumetricflaskwithdistilledwater.Theneededstandardbuffersolution（pH=6.86）canbeget.

2.Example:

DetectpHvalueoftheriverwater（Itstemperatureis19℃）.

Theselectedelectrodearemodel231glasselectrodeandmodel802（or232）referenceelectrode.

Themeasuringperiodisasfollowing:

a.Putthebuttonin“mV”positionandadjustzeropoint.

b.Putthebuttonin“pH”positionandthe“Temperaturecompensation”in“19”.Puttheactivatedcleanmodel231pHglasselectrodeandmodel802saturatedcalomelelectrodeinthestandardbuffersolutionofpH=6.88.InsertpHelectrodeintothe“measuringelectrode”positionandmodel802calomelelectrodethe“ReferenceElectrode”contact.Atthistime,thedevicegivesadisplay（anarbitrarypHvalue）.Adjustthe“Location”knobtomakethedisplay6.88pH.Thenlocationiscompleted.

c.Removetheelectrodeout.Putthecleanedelectrodesintotheriverwater.ItsconstantdisplayispHvalueoftheriverwater.Thenthemeasurementiscompleted.

ⅦFaultyandRemoval

1.Whentheelectrodedonotcontactwiththesolutionorthemeasureisinover-range,thedisplayis□□□□□togiveanalarm.

2.Donotinterfacetheelectrodeandputthebuttonin“pH”position.Ifthecalibrationscopeis7pHbelow,thecellsshouldbereplaced.

3.Inthepropervoltageforthecells,makethelocationinstandardpHsolution.IfitcannotbeadjustedtothestandardpH,theelectrodesshouldbereplacedowingtothenonparallelofthezeropotentialpointfortheelectrodesandthedevice.Turnonanewdeviceandthedisplayisnotgiven,thenthecellsshouldberefixed.

ⅧTransportationandStorage

1.Transportation:

Theinstrumentcanbetransportedbygeneraltraffictoolwithoutstrongstrike,heavyandexposuretothesun.

2.Storage:

theinstrumentshouldbestoredinthestoreroomwithenvironmentaltemperature0℃to40℃andhumiditynomorethan85%.Thereshouldbenocorrosivegasandchemicalreagentsinthestoreroom.Whilenotinuseforalongtime,theinstrumentshouldbecoveredwithdustcoatandsetinventilationanddryplace.

ⅨNotes

1.Whenadjustingzero,theQ9shortcircuitplugshouldbeputon.Whenmeasuringandcalibration,theQ9plugshouldbeputdownandthemeasuringelectrodeputon.

2.Whilenotinuseforalongtime,theinstrumentshouldbechargedononceeverymonthforthechargingcell,slife.

3.Whilechargingin“OFF”position,thechargingtimeshouldlessthanthreehourseverytime.Whenusinginternalchargingcells,theinstrumentshouldbechargedonaftersixhoursusing.

ⅩTable1

Threekindsofstandardbuffersolution,spHvalueunderdifferenttemperature

ⅪComponentsofdevice

1.Equipment1set

2.Model231glasselectrode1pc

3.Model232（or802）calomelelectrode1pc

4.Buffersubstance（ph=4,7,9）1pair

5.Polyethylenebottle1pcs

6.Chargepower1pc

7.Plasticsscrewdriver1pc

8.Operationmanual1pc