Analytical Technology Q46H/62 User manual

ModelQ46H/62
Free Chlorine
Measurement
System
HomeOfficeEuropeanOffice
AnalyticalTechnology,Inc.ATI(UK) Limited
6Iron BridgeDriveUnit 1&2GateheadBusiness Park
Collegeville, PA19426 Delph NewRoad, Delph
SaddleworthOL3 5DE
Ph: 800-959-0299Ph: [phone]
610-917-0991
Fax: [phone]Fax: + 44(0) 1457-874-468
Email: [e-mail]:[e-mail]

PRODUCT WARRANTY
AnalyticalTechnology,Inc.(Manufacturer) warrantstothe Customerthatifanypart(s)
ofthe Manufacturer's equipmentprovestobe defectiveinmaterialsorworkmanship
withinthe earlierof18 monthsof the dateof shipmentor12monthsof the dateofstart-
up,suchdefectivepartswillbe repaired orreplacedfreeofcharge.Inspectionand
repairstoproductsthoughttobe defectivewithinthewarrantyperiodwillbe completed
atthe Manufacturer's facilitiesinCollegeville,PA. Productson whichwarrantyrepairs
arerequired shall be shippedfreight prepaidtothe Manufacturer. The product(s)willbe
returnedfreightprepaidandallowed ifitisdeterminedbythe manufacturerthatthe
part(s)failed duetodefectivematerialsorworkmanship.
Thiswarrantydoesnotcoverconsumableitems,batteries,orwearitemssubject
toperiodicreplacement includinglampsandfuses.
Gassensorscarrya12 monthsfromdateofshipmentwarrantyandaresubject
toinspectionforevidenceofmisuse,abuse,alteration,improperstorage,orextended
exposuretoexcessivegasconcentrations.Shouldinspection indicatethatsensors
havefailed duetoanyoftheabove, the warrantyshall notapply.
TheManufacturerassumesnoliabilityforconsequentialdamagesofanykind,
and thebuyerbyacceptanceofthisequipmentwill assumeall liabilityforthe
consequencesofitsuseormisusebythe Customer, hisemployees, orothers. A defect
withinthe meaningofthiswarrantyisanypartofanypieceofaManufacturer's product
whichshall,when suchpartiscapableof beingrenewed,repaired,orreplaced,operate
tocondemnsuchpieceofequipment.
Thiswarrantyisinlieu ofall otherwarranties(includingwithoutlimitingthe
generalityofthe foregoingwarrantiesofmerchantabilityand fitness foraparticular
purpose),guarantees,obligationsorliabilitiesexpressed orimplied bythe Manufacturer
oritsrepresentativesand bystatuteorruleoflaw.
Thiswarrantyisvoidifthe Manufacturer's product(s)hasbeensubjecttomisuse
orabuse,orhasnotbeen operatedorstoredinaccordancewithinstructions,orifthe
serialnumberhasbeenremoved.
AnalyticalTechnology, Inc. makesnootherwarrantyexpressed orimpliedexcept
asstated above

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Table of Contents
PART1-INTRODUCTION..........................................5
1.1 GENERAL ......................................................... 5
1.2 STANDARD SYSTEM............................................ 6
1.3 FEATURES ........................................................ 9
1.4 Q46H/62 SYSTEM SPECIFICATIONS.................... 11
1.5 Q46H PERFORMANCE SPECIFICATIONS ............... 13
PART2–ANALYZER MOUNTING............................14
2.1 GENERAL ....................................................... 14
2.2 WALL OR PIPE MOUNT..................................... 15
2.3 PANEL MOUNTING .......................................... 17
PART3–SENSOR/FLOWCELL MOUNTING..............18
3.1 GENERAL ....................................................... 18
3.2 CONSTANT-HEAD FLOWCELL ............................. 18
3.3 SEALED FLOWCELL ........................................... 19
PART4–ELECTRICALINSTALLATION......................21
4.1 GENERAL ....................................................... 21
4.2 POWER CONNECTION....................................... 22
4.3 DIRECT SENSOR CONNECTION............................ 26
4.4 SENSOR WIRING ............................................. 27
4.5 JUNCTION BOX CONNECTION............................. 28
4.6 OPTIONALPHCOMPENSATION INPUT ................. 29
PART5–SENSOR ASSEMBLY..................................31
5.1 CHLORINE SENSOR PREPARATION ....................... 31
5.2 OPTIONALPHSENSORS .................................... 32
PART6–CONFIGURATION.....................................33
6.1 USER INTERFACE ............................................. 33
6.11 KEYS ............................................................. 34
6.12 DISPLAY......................................................... 34
6.2 SOFTWARE ..................................................... 36
6.21 SOFTWARE NAVIGATION .................................. 36
6.22 MEASURE MENU [MEASURE] ......................... 39
6.23 CALIBRATION MENU [CAL]............................... 40
6.24 CONFIGURATION MENU [CONFIG]................... 41
6.25 CONTROL MENU [CONTROL].......................... 47
6.26 DIAGNOSTICS MENU [DIAG]............................ 53
PART7–CALIBRATION........................................... 57
7.1 CHLORINE CALIBRATION.................................... 57
7.11 CHLORINE ZEROCAL ......................................... 57
7.12 CHLORINE SPANCAL......................................... 58
7.2 TEMPERATURE CALIBRATION ............................. 60
7.3 PHCALIBRATION ............................................. 61
7.31 TWO-POINTPHCAL ........................................ 62
7.32 ONE-POINTPHCAL ......................................... 63
7.4 ADJUSTING PHCOMPENSATION CURVE ............... 64
7.41 MODIFYING PHCORRECTION VALUES ................. 64
7.42 PHCORRECTION –TABLE MODIFICATION EXAMPLE66
7.43 STORING MODIFIED TABLE................................ 67
PART8–PIDCONTROLLERDETAILS....................... 68
8.1 PID DESCRIPTION............................................ 68
8.2 PID ALGORITHM ............................................. 68
8.3 CLASSICAL PID TUNING .................................... 70
8.4 MANUAL PID OVERRIDE CONTROL ..................... 71
8.5 COMMON PID PITFALLS ................................... 71
PART9–SYSTEMMAINTENANCE.......................... 73
9.1 GENERAL ....................................................... 73
9.2 ANALYZER MAINTENANCE................................. 73
9.3 SENSOR MAINTENANCE .................................... 73
9.4 SENSOR ACID CLEANING ................................... 74
9.5 Q22P SENSOR CLEANING ................................. 75
9.6 REPLACING THE SALTBRIDGEAND REFERENCE
BUFFER SOLUTION.................................................... 76
9.7 FLOW CELL MAINTENANCE................................ 77
PART10 –TROUBLESHOOTING.............................. 78
10.1 GENERAL ....................................................... 78
10.2 EXTERNAL SOURCESOF PROBLEMS ..................... 78
10.3 ANALYZER TESTS ............................................. 80
10.4 DISPLAY MESSAGES ......................................... 81
10.5 SENSOR TESTS ................................................ 83
10.6 TROUBLESHOOTING (Q22P SENSOR).................. 85
SPAREPARTS.......................................................... 86

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TABLEOF FIGURES
FIGURE 1-TYPICAL CHLORINE MONITORING SYSTEM.....................................................................6
F IGURE 2-CHLORINE SYSTEMW/CONVENTIONALPHSTYLE SENSOR .............................................7
F IGURE 3-SEALED FLOWCELL ASSEMBLIES WITH FLOW CONTROL .................................................8
F IGURE 4-Q46 ENCLOSURE DIMENSIONS ...................................................................................14
FIGURE 5-WALLOR PIPE MOUNT BRACKET ................................................................................15
FIGURE 6-WALL MOUNTING DIAGRAM ........................................................................................16
FIGURE 7-PIPE MOUNTING DIAGRAM..........................................................................................16
FIGURE 8-PANEL MOUNT CUTOUT .............................................................................................17
FIGURE 9-CONSTANT HEAD FLOWCELL DETAILS.........................................................................18
FIGURE 10 -SEALED CL2FLOWCELL DETAILS...............................................................................19
FIGURE 11 -SEALED PHFLOWCELL DETAILS ...............................................................................20
FIGURE 12 -LINE POWER CONNECTION .......................................................................................23
FIGURE 13 -OPTIONAL RELAY BOARD WIRING .............................................................................24
FIGURE 14 -OPTIONAL RELAY BOARD WIRING .............................................................................25
FIGURE 15 -OPTIONAL ANALOG OUTPUT WIRING.........................................................................25
FIGURE 16 -SENSOR CABLE PREPARATION .................................................................................26
FIGURE 17 –DIRECT SENSOR CONNECTION ................................................................................27
FIGURE 18 -JUNCTION BOX INTERCONNECT WIRING ....................................................................28
FIGURE 19 -JUNCTION BOX WIRINGW/OPTIONALPHCOMP.........................................................30
FIGURE 20 -CHLORINE SENSOR ASSEMBLY .................................................................................31
FIGURE 21 -USER INTERFACE.....................................................................................................33
FIGURE 22 -SOFTWARE MAP ......................................................................................................38
FIGURE 23 -AUTOMATIC PHBUFFER TABLES...............................................................................46
FIGURE 24 -CONTROL RELAY EXAMPLE ......................................................................................51
FIGURE 25 -ALARM RELAY EXAMPLE ..........................................................................................52
FIGURE 26 -TYPICAL FREE CHLORINE RESPONSE TOCHANGE IN PH.............................................66
FIGURE 27 -Q46H ISA PID EQUATION........................................................................................69
FIGURE 28 -REPLACING SALTBRIDGE AND REFERENCE BUFFER ...................................................76
FIGURE 29 -Q46H DISPLAY MESSAGES ......................................................................................81
FIGURE 30 -Q46H DISPLAY MESSAGES (CONTINUED).................................................................82
FIGURE 31 -PT100 RTD TABLE ..................................................................................................84

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Part 1 - Introduction
1.1General
TheModelQ46H/62 isaversatileon-line monitoringsystemdesigned forthe
continuousmeasurementoffreechlorine insolution.The full scaleoperating
rangeofthesystemisuserselectablefor0-200.0ppb,0-2.000ppm,0-20.00
PPM,or0-200.0ppm, andthesensingsystemwill operateonwaterstreamswith
temperaturesfrom0to55°C.TheQ46H/62Free ChlorineMeasurementSystem
iswell suited forpotablewatertreatmentplants,coolingwater,reverseosmosis
membrane protection,oractivated carbonfilterbreak-throughdetection.
Thebasicsensingelementusedinthe free chlorine monitorisapolarographic
membrane sensorwhichmeasureschlorinedirectly.Watersimplyflowspastthe
sensorand directlytodrain,withthe flowrateandpressureacross the sensor
controlledbyaconstantheadflowcell assembly.Thechlorinemeasurement
doesnotalterthe sampleoradd anychemicalstothe samplestream,sothe
waterflowcan returntothesystemifdesired.
Q46H/62Monitorsareavailableintwobasicelectronicversions,a90-260VAC
powered monitor,ora12-24VDC powered monitor–bothwiththree relaysand
two4-20 mAanalogoutputs.Bothversionsallowflexibleoutputoptionswhich
include additional4-20mAcurrentoutputs,additional0-30V signalrelays,PID
control,anddigitalcommunication cards.
Inaddition tonormalchlorine measurement,the Q46H/62 isalsoavailablewith
an optionalpHinputwhichprovidesatwo-parametermonitoringsystem.Both
freechlorine and pHaredisplayed simultaneously,and the freechlorine value is
automaticallycompensatedforpHchanges.

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1.2Standard System
ThestandardmodelQ46H/62systemincludesthreemaincomponents,the
Q46Hanalyzer,aconstanthead flowcell,and afree chlorine sensor.Asealed
flowcell isalsoavailableforapplicationswheresampleflowrateand pressure
can becarefullycontrolled.Figure1showsatypicalinstallation includingthe
optional07-0096pHsensor.
Forconnectionofthesensortotheelectronics,a25footcableissupplied.An
additional100feetofinterconnectcablemaybe added using#07-0100junction
box.All required sparepartsarealsoprovided withthe basicsystem,including
sparemembranes,electrolyte, o-rings, and anyspecialhardware.
Notethatstandard25footsensorcablesforbothchlorineandoptionalpH
sensorscanbe cuttoashorterlength.Cuttingthe cableswill notaffect
performance,andelimination ofextracablecan sometimeseliminateelectrical
noisepickup throughthe cables.
Figure 1 -TypicalChlorineMonitoring System

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Figure2belowshowsthe samestandardflowcell assemblyand chlorine sensor
alongwiththe conventionaltype pHsensor.A specialadapterisrequired tohold
the pHsensorinitsproperlocationinthe flowcell inlet chamber.
Figure 2 -ChlorineSystemw/Conventional pHStyle Sensor

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Figure3belowshowsan installationusinga00-1522sealed flowcell forthechlorine
sensorand a00-1527sealedflowcell forthe pHsensor.Thistype ofinstallation
requirescarefulflowcontrol.Werecommend theuseofour03-0372flowcontrol
assemblywhen usingsealed flowcells.Thisassemblyconsistsofanin-line filteranda
fixed-flowregulatorwhichwill maintainaconstant400cc/minflowratethroughthe
system.Thisflowwill be maintained solongasinletpressuresarebetween 5and 125
PSIG. The in-line filterisused mainlytoprotectthe flowcontrolelementagainstlarger
particlesthatmight causepluggingofthedevice.
Figure 3 -SealedFlowcellAssemblieswith Flow Control

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1.3Features
·StandardQ46H/62analyzershavefullyisolatedinputsandoutputs.Analog
outputsareadditionallycompletelyisolatedfromeachother.
·Availableineither90-260VACor12-24 VDC powersupplysystems.All features
remainthesameinbothvariations.
·Highaccuracy,highsensitivitysystem,measuresfrom20ppbto200.0ppm
through4internalautomaticranges.Userrangesof200.0ppb,2.000ppm,
20.00ppm, or200.0ppm.
·OutputHold,OutputSimulate,OutputAlarm,andOutputDelayFunctions.All
forced changesinoutputconditioninclude bumpless transfertoprovide gradual
returntoon-line signallevelsand toavoidsystemcontrolshocks onbothanalog
outputs.
·Three6ampSPDTrelayoutputsandtwoanalog4-20 mAoutputsarestandard.
Softwaresettingsforrelaycontrolincludesetpoint,deadband,phase,delay,and
failsafe.Anoptional3-relaycard, for0-30Vsignals,isavailabletobringthe total
to6relays.
·SelectablePIDcontrolleron mainanalogoutput. PIDcontrollercanoperatewith
instrument configuredasloop-poweranalyzerorasone ofthe twooutputson the
ACpowered instrument. PIDincludesmanualoperationfeature,and diagnostic
“stuck-controller” timerfeatureforalarm output ofcontrolproblems.
·Digitalcommunication optionforProfibus-DP, Modbus-RTU.Moreversions
pending. SeeQ46DigitalCommunicationsManualforSpecifications.
·Twoanalogoutputsmaybe configured totrack chlorine andtemperature,
chlorine and chlorine,orchlorineand pH.Bothanalogoutputscan be
individuallyprogrammed tofail tospecificvalues.An optionalthirdanalogoutput
isavailable, providingseparateoutputsforchlorine, pH,andtemperature.
·SelectableautomaticpHcompensationfeature.EnablesactivepHcompensation
offreechlorinereadings–requiringno pumpsorbufferstomaintainaconstant
pHlevel.The pHreadingcan alsobe senttooneofthe analogoutputsfor
completepH+chlorinemonitoring.ThepHcorrectioncanbedoneusingATI’s
optionalpHsensororusingan inputsignalof0.4-2.0VDC (4-20 mAacross a
100 ohmresistor) fromanotherpHmonitor.Inputfromanothermonitorrequires
the useofaloopisolator.

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·SelectableOutputFail Alarmfeatureallowssystemdiagnosticfailurestobesent
toexternalmonitoringsystems.
·Large, highcontrast, customLCD displaywithLEDback light providesexcellent
readabilityinanylightconditions. The secondaryline ofdisplayutilizes5x7dot
matrixcharactersforclearmessagedisplay. Twooffourmeasured parameters
maybe on the displaysimultaneously.
·Diagnosticmessagesprovide acleardescription ofanyproblemwithno
confusingerrorcodestolookup.Messagesarealsoincluded fordiagnosing
calibration problems.
·Quick and easyone-pointcalibrationmethodand sensorzero-cal.Toprovide
highaccuracy,all calibration methodsinclude stabilitymonitorsthatcheck
temperatureand mainparameterstabilitybeforeacceptingdata.
·Highaccuracythree-wirePt100temperatureinput.Temperatureelementcanbe
usercalibrated.
·Securitylock featuretopreventunauthorizedtamperingwithanalyzersettings.
All settingscanbeviewed whilelocked,buttheycannot bechanged.

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1.4Q46H/62SystemSpecifications
DisplayedParameters Maininput, 0.1ppb(0.0001 ppm)to200.0ppm
Sensortemperature,-5.0to55.0°C (23 to131 ºF)
Sensor Current, 0.0–999.9nA,0.000 to99.99 uA
Loop current, 4.00 to20.00 mA
Sensor slope/offset
Modelnumberand softwareversion
PIDController Status
OptionalpH Input value.0.00 to14.00 pH
MainParameterRanges Manualselection of one ofthe followingranges,
0.000 to200.0ppb
0.0to2.000 ppm
0.00 to20.00 ppm
0.00 to200.0ppm
Display 0.75”(19.1mm) high4-digitmaindisplaywithsign
12-digit secondarydisplay, 0.3"(7.6mm)5x7dotmatrix.
IntegralLED back-lightfor visibilityinthe dark.
Keypad 4-keymembranetype withtactilefeedback, polycarbonate
withUV coating
Weight 2lb.(0.9kg)
Ambient Temperature Analyzer Service, -20 to60 °C (-4to140 ºF)
Sensor Service,-5to55°C(23 to131°F)
Storage,-5to70°C (-22to158 ºF)
Ambient Humidity 0to95%,indoor/outdooruse,non-condensingtorated
ambienttemperaturerange
Altitude Maximum 2000m(6562 ft.)
ElectricalCertification OrdinaryLocation, cCSAus (CSA and ULstandards -
bothapproved byCSA), pollution degree 2,installation
category2
EMI/RFIInfluence Designed toEN 61326-1
OutputIsolation 600 Vgalvanicisolation
Filter Adjustable0-9.9minutesadditionaldamping to90%step
input

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TemperatureInput Pt100 RTD, 3-wiretype
Sensor 2-electrodepolarographicmembraned sensorfor direct
measurement of chlorine
SensorMaterials Noryland stainless steel
SensorCable 25 ft.(7.5meter)cablewith6-pinplug
Max.Sensor-to-Analyzer
Distance 100 feet(30.5meters), withjunction box
OptionalpHCompensation
Input Acceptsstandardcombination orQ22PpHSensors
FlowCell Constanthead overflow,clear cast acrylic, 7-30GPH, 15
GPH recommended,inlet is¼”hosebarbat1/8”MNPT,
outlet is½” hosebarbat 3/8”MNPT
Power 90 -260 VAC,50-60Hz, 10 VA max
12-24 VDC,500 mAmax.
Enclosure NEMA4X,polycarbonate, stainless steelhardware,
weatherproofandcorrosion resistant,
HWD:4.9"(124 mm)x4.9"(124mm)x5.5"(139 mm)
Mounting Options Wall orpipe mountbracketstandard.Bracketsuitablefor
either 1.5”or2”I.D. U-Boltsfor pipemounting.
Panelmountadapter optional.
Conduit Openings Five½” NPTopenings, Adaptercan beremoved to
provide a1” NPTopening inthebottom ofthe enclosure.
Gland sealsprovided butnotinstalled.
Relays, Electromechanical: Three SPDT,6amp@250 VAC, 5amp@24VDC
contacts.Softwareselection for setpoint, phase, delay,
deadband, hi-loalarm, and failsafe.A-Bindicatorson main
LCD, and Cindicatoron lower display.
Analog Outputs Two4-20 mAoutputs.Outputone programmablefor PPM
chlorine orPID. Output 2programmableforPPMchlorine,
Temperature, or pH.Maxload 500 Ohmsfor eachoutput.
Outputsgroundisolated and isolated from each other.An
additional3rd analogoption isavailable.

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1.5Q46HPerformanceSpecifications
Accuracy 0.5%of selectedrangeor 0.02 PPM
Repeatability 0.3%of selectedrangeor 0.01 PPM
Sensitivity 0.05%of selectedrange
Non-linearity 0.1%of selectedrange
Warm-up Time 3secondstorated performance (electronics only)
SupplyVoltageEffects ± 0.05%span
InstrumentResponse Time 60 secondsto90%of step input at lowest damping
Equipmentbearingthismarkingmaynotbediscarded bytraditional
methodsinthe European communityafterAugust12 2005perEU
Directive2002/96/EC.Endusersmustreturnoldequipmenttothe
manufacturerforproperdisposal.

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Part 2 – AnalyzerMounting
2.1General
All Q46 Seriesinstrumentsoffermaximummountingflexibility.Abracketis
includedwitheachunitthatallowsmountingtowallsorpipes.Inall cases,
choosealocation thatisreadilyaccessibleforcalibrations.Alsoconsiderthatit
maybe necessarytoutilizealocation wheresolutionscanbeused duringthe
calibration process.Totakefull advantageofthe highcontrastdisplay,mount
the instrumentinalocation wherethe displaycan be viewed fromvariousangles
and longdistances.
Locatethe instrumentincloseproximitytothe pointofsensorinstallation -this
will alloweasy access duringcalibration.Thesensor-to-instrumentdistance
shouldnotexceed 100feet. Tomaximizesignal-to-noiseratiohowever,work
withthe shortestsensorcablepossible.Thestandardcablelengthofthe
chlorine sensoris25feet.
RefertoFigure4foroverall dimensionsoftheQ46 monitor.
Figure 4 -Q46 EnclosureDimensions

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2.2Wallor PipeMount
APVCmountingbracketwithattachmentscrewsissupplied witheachanalyzer
(see Figure5fordimensions).The multi-purposebracketisattached tothe rear
of the enclosureusingthe fourflathead screws.The instrumentisthen attached
tothewall (Figure6)usingthefouroutermountingholesinthebracket. These
holesareslotted toaccommodatetwosizesofu-boltthatmaybe used topipe
mounttheunit(Figure7).Slotswillaccommodateu-boltsdesigned for1½“ or2”
pipe.The actualcentertocenterdimensionsforthe u-boltsareshowninthe
drawing.Notethattheseslotsareforu-boltswith¼-20 threads.The1½” pipe
u-bolt(2”I.D.clearance)isavailablefromATIintype 304stainlesssteelunder
part number47-0005
Figure 5 -Wall orPipeMount Bracket

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Figure 6 -WallMounting Diagram
Figure 7 -PipeMounting Diagram

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2.3Panel Mounting
Panelmountingusesthe panelmountingflangemoldedintothe rearsection of
the enclosure.Figure8providesdimensionsforthe panelcutoutrequired for
mounting.
Thepanelmountingbracketkitmustbe ordered separately(partnumber05-
0094).Thiskitcontainsametalretainerbracketthatattachestothe rearofthe
enclosure,4screwsforattachmentofthisbracket, and asealinggaskettoinsure
thatthe panelmountedmonitorprovidesawatertightsealwhen mountedtoa
panel.
Thesealinggasket mustfirst beattachedtothe enclosure. Thegasket contains
an adhesiveonone side sothat it remainsinplaceon theenclosure. Remove
the protectivepaperfromthe adhesiveside ofthegasketandslidethe gasket
overthe back of theenclosuresothat theadhesiveside linesupwiththe back of
the enclosureflange. Onceinplace, you can proceedtomount the monitorin
the panel.
Figure 8 -PanelMount Cutout

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Part 3–Sensor/Flowcell Mounting
3.1General
Selectalocation withinthe maximumsensorcablelengthformountingofthe
sensorflowcell.
3.2Constant-HeadFlowcell
Free chlorinesensorsarebestusedinaconstant-headoverflowchamber
becausevariationsinsampleflowrateand pressurecan causeunstable
readings.When monitoringlowconcentrations(below0.5PPM),thismethod
shouldalwaysbe used.
Mechanicalinstallationofthe flowcell requiresthatitbe mounted toawallor
otherconvenientflatsurface.Alternatively,the mountingholeson the platewill
accommodatea2"U-boltformountingthe platetoa2" pipe.Figure9showsthe
dimensionsand mountingholelocationsforthe flowcell.Be suretoallow
enoughclearanceon the left sideoftheflowcell forinsertionand removalofthe
sensor. About12 inchesclearanceisrecommended.
Figure 9 -Constant HeadFlowcell Details

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Oncemounted,inletand drainconnectionsmustbe made.The flowcell
containsa "MNPTinletconnectionanda ⅜"MNPTdrainconnection.Hose
barbsfortheinletanddrainconnectionsaresupplied withthe flowcellforuse
withflexibletubing.The inlethosebarbisused with¼"I.D.tubingand the drain
hosebarbisusedwith½"I.D. tubing.
3.3SealedFlowcell
Applicationswherethesampleinletflowiswell controlled can useasimpler
sealed flowcell.Using thisflowcell requiresthatflowbe controlled externallyto
about400 cc/min.Variableflowrateorvariablepressurewill causeunstable
readingsinthisflowcell.ATIoffersaspecialflowcontrolelementthatcanbe
used aheadofthisflowcellon the incomingsampleline.The flowcontrolispart
no.(55-0048).It will controltheinletflowrateat400cc/min.withinletpressure
variationsfrom5-150PSIG. A50 micron y-straineraheadofthe flowcontrol
elementisrecommended.The sealedflowcell providesadrainventwithcheck
valvetoavoidpullingavacuumon the flowchamber.
Figure 10 -SealedCl2Flowcell Details

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Figure 11 -SealedpH Flowcell Details