Extech Instruments CL500 User manual

USERGUIDE



FreeandTotalChlorineTester

PatentPending



ModelCL500



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CL500-en-GB_V1.2 8/15

Introduction

CongratulationsonyourpurchaseoftheCL500chlorinetester.TheCL500isarevolutionaryfirst

ofitskindmeasurementdevicethatmeasuresfreeandtotalChlorinefrom0.00to3.50ppm.

TheelectrodemethodemployedisapprovedbytheU.S.EnvironmentalProtectionAgency(EPA)

asanacceptablemethodforwastewatercompliancemonitoringoftotalchlorine.Forthistype

ofelectrodemethod,areagenttabletmustbeaddedtothemeasurementsolutionbefore

testing.TheadvantagesoftheCL500fortheuserinclude:easytouseandmaintain,high

accuracy,self‐calibration,andfastresponse.Thismeterisshippedfullytestedandcalibrated

and,withproperuse,willprovideyearsofreliableservice.Pleasevisitourwebsite

(www.extech.com)tocheckforthelatestversionofthisUserGuide,ProductUpdates,and

CustomerSupport.

Applications

TheCL500canbeusedwhereverameasurementofthetotalchlorineinwaterasneeded.This

isalsoreferredtoastotalresidualchlorine.Itmeasuresthetotalofallchlorinepresentinall

forms,includingdissolvedfreechlorine,chloramines,hypochlorousacid,andhypochloriteion.

TypicalapplicationsincludeTotalChlorinemeasurementsofdischargewaterfromwater

treatmentplants,publicdrinkingwatersuppliesandcoolingtowers,andfreechlorine

measurementsofthedisinfectantpropertiesinswimmingpoolsandcoolingwater

applications.

MeterDescription

CL500FrontPanelDescription

1. TestBottleChamber

2. TestBottleChamberlatch

3. LCDdisplay

4. POWERbutton

5. HOLDbutton

6. REC‐MAX‐MINbutton

7. ZERObutton

8. TEST‐CALbutton

9. Testbottle



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CL500-en-GB_V1.2 8/15

GettingStarted

EquipmentRequired

Achlorinetestrequiresa10mlsamplebottle,reagentpowderfortestingFreeandTotal

chlorine,andtheCL500meter.

MeasurementProcedure

Calibrationconsiderations

1. Ensurethatthemeterhasbeencalibratedpriortouse.

2. Refertothecalibrationsectionforthisprocedure.



Testsample“Zero”measurement

Note:Priortotesting,setthemetermodetoFREEorTOTALbasedonthedesiredtest

method.SeeModeSelection.

1. ThemetershouldbeintheOFFposition.

2. Placethetestsampleintothesamplebottleuptothe10mLline(minimum).Placethe

caponthebottleandtighten.

3. Cleananddrytheoutsideofthesamplebottletoensureacleansurface.

4. Openthecoverofthetestchamberandinsertthebottlecompletelyintothechamber.

5. Lineupthewhitemarkonthebottlewiththewhitemarkofthetestchamber.

6. Closethecoverandlockitinplace.

7. Pressthe“POWER”buttontoturnthemeterON.Thedisplaywillshow‘Free’or‘Total’

for1secondandthen‘CAL0’.Themeterisnowreadyforthe“zero”test.

8. Pressthe“Zero”button,thedisplaywillflash“tEST”andthen“0.00”ppm.TheZeroTest

isnowcomplete.Donotpowerdownthemeter.

MeasurementofTestSolution

1. Openthetestchamberandremovethetestbottle.

2. AddtherequiredDPDpowder(FreeorTotal)intothesampleandthenshakefor20

secondsuntilcombined.Placethecaponthebottleandtighten.

FortheFreeChlorinetest,usetheFreeChlorineDPDpowder

FortheTotalChlorinetest,usetheTotalChlorineDPDpowder

3. Cleananddrytheoutsideofthesamplebottletoensureacleansurface.

4. Wait2minutebeforeplacingthetestbottleintothemetertoallowtimeforthesolution

tomixthoroughly.

5. Openthecoverofthetestchamberandinsertthebottlecompletelyintothechamber.

6. Lineupthewhitemarkonthebottlewiththewhitemarkofthetestchamber.

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CL500-en-GB_V1.2 8/15

7. Closethecoverandlockitinplace.

8. Pressthe“Test”button.Thedisplaywillflash“tEST”forabout10secondsandthenthe

resultswillappear.

Note:Cleanandrinsethetestbottlewithdistilledwateraftereachtest.

DataHOLD

PresstheHOLDbuttononcewhiletakingameasurementtofreezethevalueonthedisplay.

PressHOLDagaintoreleasethedataholdfunction.

DataRecord(MAX/MINReadings)

1. TheDatarecordfunctionrecordstheMAXandMinreadings.

2. Press"REC"buttononcetobeginDatarecording.TheLCDwilldisplaythe"REC"symbol.

3. ToviewtheMAXvaluewhileintherecordingmodepress"REC"once.Thedisplaywillshow

themaximumreadingand“RECMAX"willshowontheLCDdisplay.

4. Press"REC"buttononceagainand"RECMIN"willdisplayontheLCDalongwiththe

minimumreading.

5. ToerasetheMaxvalueandcontinuerecording,whileintherecordmode,momentarily

pressthe“Rec”button.Thedisplaywillshow“RECMAX”.Momentarilypressthe“HOLD”

button,thedisplaywillnowshow“REC”.TheMaxvaluehasbeenerased.

6. ToerasetheMinvalueandcontinuerecording,whileintherecordmode,momentarilypress

the“Rec”button.Thedisplaywillshow“RECMAX”.Pressthe“REC”buttononceagainand

nowthedisplaywillshow“RECMIN”.Momentarilypressthe“HOLD”button,thedisplaywill

nowshow“REC”.TheMinvaluehasbeenerased.

7. ToexitRecordmode,pressthe“REC”buttonfor3seconds.Thedisplaywillreturntothe

currentreading.

ModeSelection–FreeorTotal

1. ThemetershouldbepoweredOFF.

2. Pressthe"HOLD"and"REC"buttonssimultaneouslyandthenmomentarilypressthe

"Power"button.

3. Pressthe"TEST"buttontoselectthedesiredfunction(FreeorTotal)Chlorine.

4. Pressthe"REC"buttontoconfirmandsavetheselectionintomemory.

5. Momentarilypressthe“Power”buttontoturnoffthemeter.

Auto‐PowerOFF

TheautopowerofffeatureautomaticallyswitchestheCL500OFF10minutesafterthelastkey

press.



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CL500-en-GB_V1.2 8/15

CalibrationProcedure

TheCL500canbecalibratedforFreeorTotalChlorinemeasurements.

Priortocalibration,settheMetertoeithertheFreeorTotalmode.

ZeroCalibrationProcedure

1. Pressthe“Power”buttontoturnthemeterON.ThedisplaywillshowFreeorTotalandthen

“CAL0”.

2. Pressthe“Zero”button,thedisplaywillflash“tEST”forabout10secondsandwillthenshow

“0.00”.ppm.

3. PressandholdtheCALbuttonuntil“CAL”appearsonthedisplay.ReleasetheCALbutton.

4. CleanthesidesoftheZeroChlorinesolutionbottleandinsertitintothetestingchamber.

5. Lineupthewhitemarkonthebottlewiththewhitemarkinthechamberandclosethecover

andlatchit.

6. Press"CAL"oncemoreandthedisplaywillflash“tEST”andshowthefollowing:



7. Themeterisnowreadyfor"zerochlorine"calibration.

8. Press"CAL"buttononce.TheLCDwillflash“CAL”for10secondsandwillthenshowthe

followingdisplay:



9. TheLCDwillthendisplay:



10. ZeroChlorinecalibrationisnowcomplete.Themeterisnowreadyforthe1.00ppmTest

solutioncalibration.



0.00

CAL ppm

CAL

0.00 ppm

1.00

CAL ppm

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CL500-en-GB_V1.2 8/15

1.00‐ppmTestsolutioncalibration

1. Cleanthesidesofthe1.00‐ppmChlorinestandard(FreeorTotal)solutionbottleandinsert

itintothetestingchamber.

2. Lineupthewhitemarkonthebottlewiththewhitemarkinthechamber,close,andlatch

thecover.

3. Press"CAL"oncemore;thedisplaywillflash“CAL”andthenshowthefollowing:



4. WhencalibrationiscompletetheLCDwillreturntothenormaloperatingmodeand

measurethetestsolution.Thedisplayshouldshow1.00ppm.

5. Themeterisnowreadytomeasuretestsolutions.



CAL

1.00 ppm

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CL500-en-GB_V1.2 8/15

Maintenance

LowBatteryIndication

Whenthebatteriesbecomeweakthe“ ”iconwillappearinthedisplay.Refertothebattery

replacementinformationbelow.

BatteryReplacement

1. Onthebackofthemeter,removethe2screwsholdingthebatterycoverinplace.

2. Replacethesix(6)AAAbatteries,observingpolarity.

3. Replacethebatterycompartmentcover

BatterySafetyReminders

1. Neverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.

2. Nevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.



Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.

Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriate

collectionsites,theretailstorewherethebatterieswerepurchased,orwherever

batteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuseris

obligatedtotakeend‐of‐lifedevicestoadesignatedcollectionpointforthe

disposalofelectricalandelectronicequipment.



Electrodeconsiderations

TheCL500ChlorineElectrodearrivesinafactory‐cleanedconditionandisreadytobeused.The

electrodewillperformbestandyieldmorestablereadingsafterthefirstfewtests.

CleaningtheMeter

Occasionallywipethemeterhousingwithadampcloth.Donotuseabrasivesorsolvents.



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CL500-en-GB_V1.2 8/15

Specifications

DisplayLCDsize:1.6x1.3”(41mmx34mm)

Operatingconditions 0to50°C(32to122°F)and<80%RH

Chlorinerange0.00to3.50ppm(TotalChlorine)

0.00to3.50ppm(FreeChlorine)

Resolution 0.01ppm

Accuracy0.02[email protected]ppm

LightSource LED,525nm

LightDetectorPhotoDiode

ResponseTimeLessthan10seconds

SampleVolume10mLminimum

SampleTimeApproximately1second

PowerSix1.5Vbatteries

PowerConsumptionStand‐ByMode:approx.4mADC

TestingMode:approx.12mADC

Dimensions155x76x62mm(6.1x3.0x2.4”);320g(0.70lbs.)

AutoPowerOFFAutomaticallyswitchesOFF10minutesafterthelastkeypress

MethodThemeasuringmethodisanadaptationoftheUSEPAmethod330.5

andstandardmethod4500‐ClG



Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

ISO‐9001Certified

www.extech.com

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