Analytical Technology Q45C2 User manual

ModelQ45C2
Two-Electrode Conductivity
Monitor/Analyzer
HomeOfficeEuropeanOffice
AnalyticalTechnology,Inc.ATI(UK)Limited
6Iron BridgeDriveUnit 1& 2GateheadBusiness Park
Collegeville, PA 19426 Delph NewRoad, Delph
SaddleworthOL3 5DE
Ph: 800-959-0299 Ph: [phone]
610-917-0991
Fax: [phone]Fax: [phone]
Email: [e-mail] Email:[e-mail]

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PRODUCT WARRANTY
AnalyticalTechnology,Inc.(Manufacturer) warrantstothe Customerthatifanypart(s)
ofthe Manufacturer'sproductsprovestobe 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,orwearitemssubjectto
periodicreplacement includinglampsand fuses.
Gassensors,exceptoxygen sensors,arecovered bythiswarranty,butaresubjectto
inspectionforevidenceofextended exposuretoexcessivegasconcentrations.Should
inspectionindicatethatsensorshavebeen expended ratherthan failed prematurely,the
warrantyshall not apply.
TheManufacturerassumesno liabilityforconsequentialdamagesofanykind,and the
buyerbyacceptanceofthisequipmentwill assumeall liabilityforthe consequencesof
itsuseormisusebytheCustomer,hisemployees,orothers.Adefectwithinthe
meaningofthiswarrantyisanypartofanypieceofaManufacturer's productwhich
shall,when suchpartiscapableofbeingrenewed,repaired,orreplaced,operateto
condemnsuchpieceofequipment.
Thiswarrantyisinlieu ofall otherwarranties(includingwithoutlimitingthe generalityof
the foregoingwarrantiesofmerchantabilityand fitness foraparticularpurpose),
guarantees,obligationsorliabilitiesexpressed orimpliedbythe Manufacturerorits
representativesandbystatuteorruleof law.
Thiswarrantyisvoidifthe Manufacturer's product(s)hasbeen subjecttomisuseor
abuse,orhasnotbeen operated orstoredinaccordancewithinstructions,orifthe
serialnumberhasbeenremoved.
AnalyticalTechnology,Inc.makesnootherwarrantyexpressed orimpliedexceptas
statedabove.

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Table of Contents
TABLEOF FIGURES............................................ 4
PART1- INTRODUCTION................................. 5
1.1 General...................................................... 5
1.2 Features..................................................... 5
1.3 Q45C2SystemSpecifications................... 6
1.4 Q45C2Performance Specifications.......... 8
PART2–ANALYZERMOUNTING.................10
2.1 General.....................................................10
2.2 Wall or PipeMount..................................13
2.3 Panel Mount,ACPoweredMonitor ........15
PART3–ELECTRICALINSTALLATION......16
3.1 General.....................................................16
3.2 Electrical ..................................................16
3.2 Two-Wire.................................................17
3.21 LoadDrive...............................................20
3.3 115/230VACw/Relays...........................20
3.4 Sensor Wiring ..........................................23
3.5 Direct Sensor Connection ........................23
3.6 JunctionBoxConnection.........................25
3.7 In-LineSensor Connection......................26
3.8 OEM Sensor Connection .........................27
3.9 SanitarySensor Connection.....................28
PART4–CONFIGURATION.............................29
4.1 User Interface...........................................29
4.11 Keys.........................................................30
4.12 Display.....................................................30
4.2 Software...................................................32
4.21 SoftwareNavigation...............................32
4.22 MeasureMenu [MEASURE]...................35
4.23 CalibrationMenu [CAL].............................36
4.24 ConfigurationMenu[CONFIG].............37
PART5- CONTROL............................................42
PART- 6DIAGNOSTICS MENU [DIAG].........46
PART7–CALIBRATION...................................50
7.1 OverviewandMethods............................50
7.11 1-PointCalibrationExplained..................50
7.12 Cell ConstantCalibrationExplained........51
7.13 Zero CalibrationExplained......................51
7.2 Performinga1-PointCalibration.............51
7.3 PerformingaCell ConstantCalibration...53
7.4 PerformingaSensor Zero Calibration.....53
7.5 TemperatureCalibration ..........................54
7.6 TCFactor Calibration..............................55
PART8–PIDCONTROLLERDETAILS.........56
8.1 PIDDescription.......................................56
8.2 PIDAlgorithm.........................................56
8.3 Classical PIDTuning ...............................58
8.4 ManualPIDOverrideControl..................59
8.5 CommonPIDPitfalls...............................59
PART9–SYSTEMMAINTENANCE................61
8.1 SystemChecks.........................................61
8.2 InstrumentChecks...................................62
SPAREPARTS......................................................65

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Table of Figures
FIGURE 1-ENCLOSURE DIMENSIONS,AC POWERED UNITS..........................................................11
FIGURE 2-ENCLOSURE DIMENSIONS,2-WIRE &BATTERY UNITS..................................................12
FIGURE 3-WALLOR PIPE MOUNT BRACKET ................................................................................13
FIGURE 4-WALL MOUNTING DIAGRAM ........................................................................................14
FIGURE 5-PIPE MOUNTING DIAGRAM..........................................................................................14
FIGURE 6-115/230 VAC PANEL MOUNT &CUT-OUT ...................................................................15
FIGURE 7-CABLE DESCRIPTION,MODEL Q25C2.........................................................................17
FIGURE 8-LOOP POWER CONNECTION .......................................................................................18
FIGURE 9-LINE POWER CONNECTION .........................................................................................22
FIGURE 10 -DC POWER CONNECTION.........................................................................................22
FIGURE 11 -RELAY CONTACTS ...................................................................................................23
FIGURE 12 -SENSOR CABLE PREPARATION .................................................................................24
FIGURE 13 -JUNCTION BOX INTERCONNECT WIRING ....................................................................25
FIGURE 14 -IN-LINE SENSOR CONNECTION .................................................................................26
FIGURE 15 -OEM SENSOR CONNECTIONS ..................................................................................27
FIGURE 16 -SANITARY SENSOR WIRING ......................................................................................28
FIGURE 17 -USER INTERFACE.....................................................................................................29
FIGURE 18 -SOFTWARE MAP ......................................................................................................34
FIGURE 19 -CONTROL RELAY EXAMPLE ......................................................................................44
FIGURE 20 -ALARM RELAY EXAMPLE ..........................................................................................44
FIGURE 21 -NACL REFERENCE SOLUTION FOR CALIBRATION .......................................................51

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Part 1-Introduction
1.1General
TheModelQ45C2Conductivitymonitor/analyzerprovidesan extremelyversatile
measurementsystemformonitoringand controlofresistivity/conductivityover
the rangeof0.056µS/cmto2000 µS/cm.The instrumentisofferedstandardas
aloop-powered transmitterfor2-wireDCapplications.Sincethissystem
configuration operatesoveronlytwolow-voltagewires,itisidealforremote
monitoringapplicationswhereline poweriseitherunavailableorprohibitively
expensivetorun.
Q45C2Monitorsareavailableinfourelectronicversions,aloop-powered 2-wire
transmitter,an ACpowered monitorwithintegralalarmrelaysanddual4-20mA
outputcapability,a12-24 VDC unitwithdualoutputand relays,ora9VDC
batteryoperatedportableunit withtwovoltage outputsand built-indatalogger.
Inall configurations,theQ45C2displaysconductivity,sensortemperature,TDS,
and outputloop currenton the secondaryline ofthe customdisplay.The
instrument isusedwiththe highperformanceQ25C2sensorsorothercompatible
2-electrodesensors.
WARNING:Notfollowing operating instructionsmayimpairsafety.
NOTE:Due tothehighdegree offlexibilityoftheQ45 systemoptions,itis
importanttonoteareasofthe operatingmanualthatdetail theseoptional
features.The softwarefeaturesfortherelayoutputoption onlyappearwhen
thosemodulesareconnectedand the systemhasbeenre-powered.
1.2Features
·StandardQ45C2electronictransmittersaredesigned tobeafullyisolated,loop
powered instrumentsfor2-wireDC applications. Optionalintegralpower supplycardfor
115/230 VAC operation,12-24 vdc,and optionalbatterypowersupplycardforportable
dataloggingapplicationsareavailable.
·OutputHold,OutputSimulate,OutputAlarm,and OutputDelayFunctions.All forced
changes inoutputcondition include bumpless transfertoprovide gradualreturntoon-
line signallevelsand toavoidsystem controlshocksonbothanalog outputs.
·AC poweroption providesdualSPDTrelayoperation and one additionalisolated analog
output. Softwaresettings for relaycontrolincludesetpoint,deadband,phase,delay,and
failsafe.Softwarecontrolsautomaticallyappearinmenu listwhen hardwareoption card
ispluggedinand systempower isapplied.

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·Twoanalogoutputsonthe relayversion maybe configured totrackconductivityand
temperature.Bothanalog outputscanbe individuallyprogrammed tofail tospecific
values.
·SelectableOutputFail Alarm featureallowssystemdiagnosticfailurestobe sentto
externalmonitoring systems.
·Large,highcontrast, customSuper-Twistdisplayprovides excellentreadabilityeven in
lowlightconditions.Thesecondaryline ofdisplayutilizes 5x7dotmatrixcharactersfor
clearmessagedisplay twooffourmeasuredparametersmaybe on the display
simultaneously.
·Diagnosticmessagesprovide acleardescription ofanyproblemwithno confusingerror
codes tolookup.Messagesarealso included fordiagnosingcalibration problems.
·Quickand easyone-pointcalibration method and sensorzero-cal.Toprovide high
accuracy,all calibration methods include stabilitymonitorsthatchecktemperatureand
mainparameterstabilitybeforeacceptingdata.
·SelectablePt1000 orPt100 temperatureinputs.Systemscan also be hard-configured
forthree-wireelements.Temperatureelement canbe user calibrated.
·Securitylockfeaturetopreventunauthorized tamperingwithtransmittersettings.All
settingscan beviewed whilelocked,but theycannot bechanged.
·Highreliability,microprocessor-based systemwithnon-volatilememoryback-up that
utilizes no batteries.Lowmass,surface mountPCB construction containingno
adjustment potentiometers.All factorycalibrations stored innon-volatileEEPROM.
1.3Q45C2SystemSpecifications
(Common toall variations)
Enclosure NEMA4X,polycarbonate, stainless steelhardware,
weatherproofandcorrosion resistant,
HWD:4.4"(112 mm)× 4.4"(112mm)×3.5"(89mm)
Mounting Options Wall, panel, pipe/header.
Weight DC transmitterconfiguration:1lb.(0.45kg)
Line-powered unit:1.5lb.(0.68 kg)
Display Large,high-contrast,Super-Twist (STN)LCD;
4-digit maindisplaywithsign,0.75"(19.1mm) seven-
segmentcharacters;
12-digit secondarydisplay,0.3"(7.6mm) 5×7dotmatrix
characters

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Keypad 4-keymembranetype withtactilefeedback, polycarbonate
withUV coating, integral EMI/staticshieldandconductively
coated window
Ambient Temperature Service, -20 to60°C(-4to140ºF)
Storage,-30to70°C (-22to158 ºF)
Ambient Humidity 0to95%,indoor/outdooruse,non-condensingtorated
ambienttemperaturerange
Altitude 2000 m(6562Ft.)
ElectricalCertification OrdinaryLocation,cCSAus (CSA and ULstandards-both
approved byCSA), pollution degree 2,installation category
2
EMI/RFIInfluence Designed toEN 61326-1
OutputIsolation 600 Vgalvanicisolation
Filter Adjustable0-9.9minutesadditionaldamping to90%step
input
TemperatureInput SelectablePt1000 or Pt100 RTD
DisplayedParameters Maininput, 0.0 Sto2000 S
TDS
Sensortemperature,-10.0to110.0°C (14 to230ºF)
Loop current, 4.00 to20.00 mA
MainParameterRanges Automaticor manualselection ofthe following:
0.00 to20.00 MW/ with0.05Kcell constant
0.0to200.0kW/ with0.05Kcell constant
0.000 to2.000 S/ with0.05Kcell constant
0.00 to20.00 S/ with0.05Kor 0.5Kcell constant
0.0to200.0 S/ with0.05K, 0.5Kor1.0Kcell constant
0to2000 S/ with0.5Kor 1.0Kcell constant
(NOTcommon to allvariations)
Standard 2-Wire(Loop-powered)Transmitter:
Power 16-35 VDC (2-wiredevice)
Enclosure: NEMA4X,polycarbonate, stainless steelhardware,
weatherproofandcorrosion resistant,
HWD:4.4"(112 mm)x4.4"(112mm)x3.5"(89 mm)

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Mounting Options Wall orpipe mountbracketstandard.Bracketsuitablefor
either 1.5”or2”I.D. U-Boltsfor pipemounting.
Conduit Openings TwoPG-9openingswithgland seals
DC CableType Belden twisted-pair, shielded, 22gaugeor larger
Insertion Loss 16 VDC
12-24 VC/115/230 VAC+Dual RelayOption:
Power 115/230 VAC ± 10%,50/60 Hz, 10 VA max
11-27 VDC,250 mAmax.
Enclosure,ACPowered 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 Three ½”NPTopenings.Gland sealssupplied but not
installed.
Relays, Electromechanical: TwoSPDT,6amp@250VAC, 5amp@24VDC
contacts.Softwareselection for setpoint, phase, delay,
deadband, hi-loalarm, and failsafe.A-Bindicatorson
mainLCD.
Analog Outputs Two4-20 mAoutputs.Outputone programmablefor
conductivity. Output2programmablefortemperatureor
conductivity. Maxload 550 Ohmsfor eachoutput.
Outputsgroundisolated and isolated from each other.
Max. load foroutputson12-24 VDC powered unitsis400
ohms.
1.4Q45C2Performance Specifications
(Common toall variations)
Accuracy 0.1%of span or better
Repeatability 0.1%of span or better
Sensitivity 0.05%of span
Stability 0.05%of span per 24hours,non-cumulative

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Warm-up Time 7secondstorated performance
SupplyVoltageEffects ± 0.05%span
InstrumentResponse Time 2secondsto90%of stepinput at lowest setting
TemperatureDrift Span or zero, 0.03%of span/°C
Max.Sensor-Instrument 300 ft.(91.4meters)
Distance
SensorTypes ModelQ25C2-4wireinput or equal
AccuracyNote:TheQ45C2isdesigned toallowmeasurementsover abroadconductivity
rangeusingsensorswitheither0.05Kor0.5Kcell constants.However,
extendingthemeasurementsmade withvarious cell constantscanresult
insomenon-linearityatthe highend of operatingranges.Thiscan
reduce accuracyfrom 0.1%to1-2%insomecases.Whenhighaccuracy
iscritical, thefollowingprovides alist of thepreferred cell constant tobe
used for various operatingrangesinordertomaintainthehighest
accuracy.
0.05KSensor–Use for all resistivityranges(20MWor200 KW)
0.05KSensor–Use for 0-2.000or0-20.00 uSranges.
0.5KSensor–Use for0-200 uSrange
0.5KSensor–Use for0-2000 uSrange when high accuracyisneeded
below1000 uS.
1.0KSensor–Use for0-2000 uSrange when high accuracyisneeded
between 1000 and 2000uS.
Equipmentbearing thismarking maynotbediscarded bytraditional
methodsintheEuropeancommunityafterAugust12 2005perEU Directive
2002/96/EC.End usersmustreturnoldequipmenttothe manufacturerfor
properdisposal.

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Part 2–AnalyzerMounting
2.1General
All Q45 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 alloweasyaccessduringcalibration.The standardcablelengthofthe
conductivitysensoris15 feet.Forsensorcableslongerthan30feet,usethe
optionaljunction box(07-0100)and sensorinterconnectcable(31-0057).
Due tothe flexibilityofthe instrumentdesign,someofthemountingfeatures
changebased on the configuration thatwasordered.Forexample,the2-wire
transmitterversion isdifferentforthe115/230VACcontrollerbecausethe rearof
the enclosureismuchdeeperwhen the ACpowered unit isused. Inaddition, the
ACpowered unithasan integrated panelmountflangerequiring asinglecutout
forflushmounting.Inthe 2-wiretransmitterconfiguration,justthefrontofthe
enclosurecan be mounted,butthe cutoutalsorequiresaccuratelocationof4
mountingholes.RefertoFigure1and Figure2fordetaileddimensionsofeach
type ofsystem.

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Figure 1 -EnclosureDimensions, AC PoweredUnits
ENTER
MENU
ESC

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Figure 2 -EnclosureDimensions, 2-Wire & Battery Units
1"NPT
1.23
(31.2)
.82
(20.8)
BOTTOMVIEW
3.45
(87.6)
1.68
(42.7)
SIDEVIEW
4.38
(111.2)
4.38
(111.2)
ENTER
MENU
ESC
FRONTVIEW
2.61
(66.3)
2.61
(66.3)
#10-32UNF
(4PLACES)
BACKVIEW
PG-9PORT
(2PLACES)
1.23
(31.2)
BOTTOMVIEW

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2.2Wallor PipeMount
APVCmountingbracketwithattachmentscrewsissuppliedwitheach
transmitter(seeFigure3fordimensions).Themulti-purposebracketisattached
tothe rearoftheenclosureusingthe fourflathead screws.The instrumentis
then attachedtothewall using the fouroutermountingholesinthe bracket.
Theseholesareslottedtoaccommodatetwosizesofu-boltthatmaybe used to
pipe mounttheunit.Slotswill accommodateu-boltsdesignedfor1½“or2”pipe.
Theactualcentertocenterdimensionsforthe u-boltsareshowninthe drawing.
Notethattheseslotsareforu-boltswith¼-20 threads.The1½” pipe u-bolt(2”
I.D. clearance)isavailablefromATI intype 304 stainless steel(47-0005).
Figure 3 -Wall orPipeMount Bracket

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Figure 4 -WallMounting Diagram
Figure 5 -PipeMounting Diagram
ENTER
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ESC
ENTER
MENU
ESC

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2.3Panel Mount,ACPoweredMonitor
PanelmountingofanACpowered monitorusesthe panelmountingflange
molded intothe rearsection ofthe enclosure.Figure6providesdimensionsfor
the panelcutout required formounting.
Thepanelmountingbracketkitmustbe ordered separately(partnumber05-
0068).Thiskitcontainsametalretainerbracketthatattachestothe rearofthe
enclosure,4screwsforattachmentofthisbracket, and asealinggaskettoinsure
thatthe panelmountedmonitorprovidesawatertightsealwhen mountedtoa
panel.
Thesealinggasketmustfirstbe attached tothe enclosure.The gasketcontains
an adhesiveononeside sothatitremainsinplaceon theenclosure.Remove
the protectivepaperfromtheadhesiveside ofthegasketand slide the gasket
overthe back oftheenclosuresothattheadhesiveside linesupwiththebackof
the enclosureflange.Onceinplace,you can proceed tomountthe monitorin
the panel.
Figure 6 -115/230VAC Panel Mount & Cut-Out
ENTER
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ESC

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Part 3–Electrical Installation
3.1General
TheQ45 ispowered inone oftwoways,dependingon theversion purchased.
The2-wireversion isa16-35VDC powered transmitter.Theintegral115/230
VACversion requiresline power. Pleaseverifythe type ofunit beforeconnecting
anypower.
WARNING:Do notconnect AClinepowertothe2-wiremodule.
Severedamagewillresult.
ImportantNotes:
1.Usewiringpracticesthatconformtoallnational,stateandlocal
electricalcodes.Forpropersafetyaswell asstablemeasuring
performance,itisimportantthatthe earthgroundconnectionbe made
toasolidground pointfromterminal12(Figure8).TheACpower
supplycontainsasingle100mA(115V)or50mA(230V)slo-blofuse.
Thefuse F1 islocated adjacent to TB5 andiseasilyreplaceable.
2.DoNOTrunsensorcablesorinstrument4-20 mAoutputwiringinthe
sameconduitthatcontainsACpowerwiring.ACpowerwiring should
be runinadedicatedconduittopreventelectricalnoisefromcoupling
withthe instrumentationsignals.
3.Thisanalyzermust beinstalled byspecificallytrainedpersonnelin
accordancewithrelevant localcodesandinstructionscontainedinthis
operatingmanual.Observethe analyzer's technicalspecificationsand
input ratings. Properelectricaldisconnectionmeansmustbeprovided
priortothe electricalpowerconnected tothisinstrument, suchasa
circuit breaker-rated 250 VAC,2A minimum. Ifone lineof theline
powermainsisnotneutral, useadouble-polemainsswitchto
disconnect the analyzer.
3.2Electrical
TheModelQ25C2comesstandardwith15 feetof6conductordoubleshielded
cable(4wiresareused). The cableispermanentlyattached tothesensor, and a
PEEK cordgripisusedtosealaround the cable.Nevertheless,the cableshould
alwaysbe keptascleananddryaspossible.
DANGER:DONOTconnectsensor cabletopowerlines.Serious
injurymayresult.

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TakecaretoroutesensorcableawayfromACpowerlines, adjustablefrequency
drives, motors,orothernoisyelectricalsignallines. Donot run signallinesinthe
sameconduitasACpowerlines. Run signalcableindedicated metalconduit if
possible.Foroptimumelectricalnoiseprotection, runanearthgroundwiretothe
ground terminalinthetransmitter
RefertoFigure7, CableDescriptionandFigure8,WiringDiagramforillustrative
detailson electricalinstallation.
Figure 7 -Cable Description,Model Q25C2
OnlyATI’scustom6-wireshielded interconnectcablemustbe used when
connectingthe ModelQ25C2sensortothe analyzer.Thishigh-performance,
doubleshielded,polyethylene jacketedcableisspeciallydesigned toprovide the
propersignalshieldingforthesensorusedinthissystem.Nosubstitutionscan
be made. Substituted cablesmaycauseproblemswithsystemperformance.
3.2Two-Wire
Inthe two-wireconfiguration,aseparateDCpowersupplymustbe usedto
powerthe instrument.Theexactconnectionofthispowersupplyisdependent
on thecontrolsystemintowhichthe instrumentwill connect. SeeFigure8for
furtherdetails.Anytwisted pair shieldedcablecan beused forconnectionofthe
instrumenttothepowersupply.RoutesignalcableawayfromACpowerlines,
adjustablefrequencydrives,motors,orothernoisyelectricalsignallines.Donot
run sensororsignalcablesinconduitthatcontainsACpowerlinesormotor
leads.

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Figure 8 -Loop PowerConnection
Notes: 1. Voltagebetween Terminals7and8MUSTbe between 16and 35 VDC.
2. Earthground intoTerminal10 isHIGHLYrecommended. Thisconnection
can greatlyimprovestabilityinelectricallynoisyenvironments.

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3.21LoadDrive
Theamountofresistancethattheanalogoutputcan driveinthe 115/230 VAC
version isfixed.However,inthetwo-wireconfiguration,the load-drivelevelis
dependenton theDC supplyvoltageprovided tothecontroller.
Thetwo-wireinstrumentcanoperateonapowersupplyvoltageofbetween16
and 35 VDC.The availableload drivecapabilitycan be calculated byapplying
the formulaV/I=R,whereV=load drivevoltage,I=maximumloopcurrent(in
Amperes), and R=maximumresistanceload (inOhms).
Tofindtheloaddrivevoltageofthe two-wireQ45,subtract16 VDC fromthe
actualpowersupplyvoltagebeingused(the 16 VDC representsinsertion loss).
Forexample,ifa24VDC powersupplyisbeingused,theload drivevoltageis8
VDC.
Themaximumloop currentofthetwo-wireQ45 isalways20.00 mA,or.02A.
Therefore,
Forexample,ifthepowersupplyvoltageis24 VDC,firstsubtract16 VDC,then
divide theremainderby.02.8/.02 =400;therefore,a400Ohmmaximumload
can beinserted intotheloopwitha24VDC powersupply.
Similarly, the followingvaluescan becalculated:
3.3115/230VAC w/Relays
Inthe115/230VACconfiguration,aDC powersupplyismountedintothe inside
rearofthe enclosure.The powersupplymustbe orderedwiththeproper
operatingvoltage.Verifythatthe unitrequireseither115 VACor230 VAC
beforeinstalling.Alsoverifythatpowerisfullydisconnected beforeattemptingto
wire.
(PowerSupplyVoltage
-
16)
.02 =RMAX
PowerSupplyVoltage(VDC)
Total Load(Ohms)
16.00
20.0200
24.0400
30.0700
35.0950