Siargo MF5100V User manual

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Gas Mass Flow Meter VB.1
Model MF5100V

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www.Siargo.com
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MF5100V
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UserManual
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
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Gas Mass Flow Meter
withMEMScalorimetricsensingandmanualcontrol
MF5100VSeries
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User Manual
DocumentNo. 07‐2021‐MC2EN
Issuedate:  2021.07
Revision:  VB.1
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SiargoLtd.
3100DeLaCruzBoulevard,Suite210
SantaClara,CA95054
USA
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Tel:+1(408)969.0368
Email:[email protected]
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©Copyright2021bySiargoLtd.
SiargoLtd.anditssubsidiariesreservetherighttochangethespecificationsand/ordescriptions
withoutpriornotice.Forfurtherinformationandupdates,pleasevisit:www.Siargo.com
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www.Siargo.com

MF5100V

UserManual
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
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Attention!
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Usewithcaution!
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Pleasecarefullyreadthismanualpriortooperatingthisproduct.
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Donotopenormodifyanyhardwarewhichmayleadtoirrecoverable
damage.
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Donotusethisproductifyoususpectanymalfunctionsordefection.
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Donotusethisproductforcorrosivemediaorinastrongvibration
environment.
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Usethisproductaccordingtothespecifiedparameters.
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Onlythetrainedorqualifiedpersonnelshallbeallowedtoperform
productservices.
Becautiousfortheelectricalsafety,evenitoperatesatalowvoltage,or
battery,anyelectricalshockmightleadtosomeunexpecteddamages.
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Thegastobemeasuredshouldbecleanandfreeofparticles.Donotapply
thismeterforliquidmedium.
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Donotapplyforanyunknownornon‐specifiedgasesthatmay
damagetheproduct.
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Forremotedata,pleasebesurethemeterisproperlyconfigured.

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www.Siargo.com

MF5100V
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UserManual
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
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TableofContents
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1.Overview..................................................................................................5
2.Receipt/unpackoftheproducts................................................................6
3.Knowingtheproducts...............................................................................7
3.1.Productdescription...............................................................................................7
3.2.LCDdescription.....................................................................................................7
3.3.Poweranddatacabledescription...........................................................................8
3.4.Mechanicaldimensions..........................................................................................9
4.Batteryinstallation..................................................................................10
5.Meterinstallation....................................................................................11
6.Operation...............................................................................................13
6.1Checktheproductspecifications...........................................................................13
6.2Checktheleakage...............................................................................................13
6.3Powerthemeteranddigitaldataconnection.........................................................13
6.4Controltheflowratewiththemanualvalve...........................................................14
6.5Startingthemeasurement...................................................................................14
6.6RS485Modbuscommunicationprotocol...............................................................15
6.6.1Hardwareconnection....................................................................................................15
6.6.2Communicationparameters..........................................................................................15
6.6.3Frame..........................................................................................................................16
6.6.4Functioncodes.............................................................................................................16
6.6.5Registers......................................................................................................................17
7.Productselectionandorderinformation....................................................20
7.1Productselection................................................................................................20
7.2Ordercontactandcustomersupport.....................................................................20
8.Technicalspecifications............................................................................21
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www.Siargo.com

MF5100V

UserManual


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9.Technicalnotesfortheproductperformance.............................................22
9.1Measurementprinciple........................................................................................22
9.2Precautionsforthebestperformanceoftheproduct..............................................22
9.2.1Comparisonwithathirdpartyreferencemeter...............................................................22
9.2.2Particlecontaminationandfluidiccleanness..................................................................23
9.2.3Applytoadifferentgasmedium....................................................................................23
10.Troubleshooting......................................................................................24
11.WarrantyandLiability..............................................................................25
12.Servicecontact........................................................................................27
AppendixI:Productevaluationkit.................................................................28
AppendixII:Documenthistory......................................................................29
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www.Siargo.com

MF5100V

UserManual
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
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1. Overview
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Allcontactinformationcanbefoundattheendofthismanual.
ThismanualprovidesessentialinformationfortheoperationoftheMF5100Vseriesofgasmassflow
metersforgeneral‐purposegasmetrologyapplications.Theproductperformance,maintenance,
andtrouble‐shootingaswellastheinformationforproductorder,technicalsupport,andrepairare
alsoincluded.
MF5100Vmassflowmetersaredesignedforgeneralpurposegasmeasurementandprocesswitha
precisemanualcontrolvalve.Themeterseriesofferreadingaccuracyatalargedynamicrangeand
isdesignedtobeoperatedwithmobilepower.Additionally,themeteriscapableofbuild‐ingas
recognitionforthepre‐calibratedgases,offeringseamlesslyswitchingamongdifferentgaseswith
distinctthermalproperties.
Applicationsoftheproductsincludelaboratorygasprocessing,cylindergascontrolinamobile
vehiclesuchasanambulance,andmanymore.
ThemetersareoperatedwithSiargo’sproprietaryMEMScalorimetricmassflowsensorstogether
withthesmartcontrolelectronics.Thesensorsurfaceispassivatedwithsiliconnitrideceramic
materialstogetherwithawater/oilproofnano‐coatingforperformanceandreliability.Themeter
bodyismadeofstainlesssteelthatisavailableforapplicationsofmostofthegases.
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www.Siargo.com
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MF5100V

UserManual


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2. Receipt/unpackoftheproducts
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Uponreceiptoftheproducts,pleasecheckthepackingboxbeforethedismantlementofthepacking
materials.Ensurenodamagesduringshipping.Ifanyabnormalityisobserved,pleasecontactand
notifythecarrierwhoshippedtheproductandinformthedistributorsorsalesrepresentativesifthe
orderisnotplaceddirectlywiththemanufacturer,otherwise,themanufacturershouldbeinformed
aswell.Foranyfurtheractions,pleaserefertothereturnandrepairsectioninthismanual.
Ifthepackingboxisintact,proceedtoopenthepackingbox,andyoushallfindtheproduct(either
themeterorthemeterwithvalvepertheactualorder).Thepoweradapterand/ordatacableas
shownbelowmayalsobefoundaccordingtoyouractualorder.
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
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 



Flowmeterdatacable,optional
Figure2.1:MF5100Vflowmeterandaccessories

Pleasecheckimmediatelyfortheintegrityoftheproductaswellasthepoweranddatacable,ifany
abnormalisidentified,pleasenotifythedistributor/salesrepresentativeormanufacturerassoonas
youcan.Ifanydefectsareconfirmed,anexchangeshallbearrangedimmediatelyviatheoriginal
saleschannel.(Note:theLCDscreenshallnotbelighteduntilthepowercableispluggedinorthe
batteryisinstalled).Thisusermanualshallalsoeitherbeincludedinthepackingboxorviaanonline
requestforanelectronicversion.Inmostcases,thismanualshallbemadeavailabletothecustomer
beforetheactualorder.
Theoptionalcableisastandardonewithalockingconnectorthatoffersexternalpoweraswellas
wireddatacommunication.Forthebattery,therecommendedlithium‐ionbattery(TadiranTL5930
orSAFTLS33600,bothare3.6Vdc,19Ah)shallbepurchasedbytheuseratalocalsupplyduetothe
freightrestrictions.





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
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
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3. Knowingtheproducts

3.1. Productdescription










Figure3.1:MF5100Vpartsdescription
3.2. LCDdescription






Figure3.2:MF5100VLCDdisplay
TheLCDprovidesallinformationthattheproductmeasures.Somesymbolsarereservedfor
futureupgrades,andwillnotbelightedduringtheoperation.Thefollowingtabledetailsthe
meaningofeachofthesymbols.

Battery
chamber

LCDdisplay
Precisevalve
FlowdirectionElectricalinterface,M8
Powerswitch
OutletInlet

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
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
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Table3.1:Symbolsdescription 
ThevalueistheModbusaddressofthemeter

The

valuenexttothesymbolis

the

totalizeroraccumulatedflowrate

inSL(standardliters)orNCM(Normalizedcubicmeters).Herethe
standard(normalized)conditionsreferto20°C,101.325kPa.

ThevaluenexttothesymbolistheinstantflowrateinSLPM
(StandardLitersperminute)

Whenthemeterisswitchedtomeasureadifferentgasotherthanthe

oneatthetimeofshipping,themeterwilltrytoidentifythegas,and
ifapre‐storedgasismatched,thissymbolwillbedisplayedinsteadof
themeterModbusaddress.
Statusofthebattery,whenthemeterisoperatingwiththebattery

power.
Temperature,formodelswithtemperatureoption

3.3. Poweranddatacabledescription

 
Table3.2:MF5100Vwireassignments.

 





Figure3.3:MF‐GDinterfaceterminal

Thecableconnectorhastwopinsforpositioningwhenpluggingintothemeter.Donotforcethe
plug.Aftertheplugisproperlyengaged,usetheplugscrewtotightentheengagement.
 
Wire Color Definition
1Red

Powersupply,8~24Vdc
2Black

Ground

3Green

RS485A

4BrownRS485B
5YellowAlarm
6Transparent

Ground
7VioletN.C.



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3.4. Mechanicaldimensions



Figure3.4:MF5100Vmeterdimensions

Themechanicaldimensionsshownareforupto0~5SLPMflowrate.Foranotherflowrate,please
contactthemanufacturerfordetailedinformation.





www.Siargo.com
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MF5100V
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4. Batteryinstallation

Forthebatterypoweroptions,pleaserefertothefollowinggraphtoinstallabattery(C‐Celllithium
batterywith3.6Vdcand9Ah).Thebatteryshouldhavethenecessarysafetycertificate.
Followingthestepstoinstallthebattery:
(a) Removalofthescrewswithascrewdriver,4screwsasindicatedbytheredarrows:

Figure4.1:Removalofscrews

(b) Installthebattery–formostoftheapplications,thebatterylifeshouldbe3+years.Andre‐
assemblethebackcoverofthemeterhead.

Figure4.2:Installthebattery

T2
(M2.5)



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5. Meterinstallation

Donotopenoralteranypartoftheproductwhichwouldleadtomalfunctionandirrecoverable
damage.Itwillalsoforfeitthetermsofthewarrantyandcauseliability.
Theproductatthetimeofshipmentisfullyinspectedforitsqualityandmeetsallsafetyrequirements.
Additionalsafetymeasuresduringtheinstallationshouldbeapplied.Thisincludes,butisnotlimited
totheleakageverificationprocedures,standardEDS(electrostaticdischarge)precautions,DC
voltageprecautions.Othertaskssuchascalibration,partreplacement,repair,andmaintenance
mustonlybeperformedbytrainedpersonnel.Uponrequests,themanufacturerwillprovide
necessarytechnicalsupportand/ortrainingofthepersonnel.
Checkthemanualcontrolvalvewhichshouldbeatthefullclosedstatusatthetimeofinstallation.
Flowdirectionshouldbealignedwiththearrowmarkonthemeterbody.Iftheflowingfluidmay
haveparticlesordebris,afilterisstronglyrecommendedtobeinstalledupstreamofthemeter.
Pleasefollowthefollowingstepstocompletetheinstallation:
a)Uponopeningthepackage,theproduct'sphysicalintegrityshouldbeinspectedtoensureno
visualdamage.
b)Beforeinstallationoftheproduct,pleaseensurethatthepipedebrisorparticlesoranyother
foreignmaterialsarecompletedremoved.
d)Fornon‐batterypoweroperation,connectelectricalwiresperthewiredefinitioninTable3.3.
Pleasebesureofthepowersupplyrange(i.e.,12~24VDC)andpowersupplypolarization.If
anadapterotherthantheonesuppliedbythemanufacturer,makesuretheadaptermeets
industrialstandardsandhasallsafetycertifications.
e)Forthedatacommunicationwireconnection,pleasefollowthedescriptioninTable3.3and
makesurethatthewiresarecorrectlyconnectedtotheproperportsonyourdata
device/equipment.Pleasemakesurethedatacablemeetsindustrialstandardswithproper
shielding.
f)Oncetheexternalpowerissuccessfullyconnectedorthebatteryisinstalled,theLCDshouldbe
lightedupwiththeproperinformationdisplayedworkscorrectly.
g)Slowlyopenthevalve(s)ifany,upstreamordownstreamorbothofthepipeline,followedby
slowlyopenthemanualcontrolvalveonthemeter.Andthemetershouldthenstarttomeasure
theflowinthepipeline.Note:becausethemeterhasalargedynamicalmeasurementrange,it
couldbenormalifyouseethesmallinstantflowratebeforeyouopenthevalveastherecould
besomeleakage.However,makesurethemeterreadsnullwhenthereisnoflowpresentinthe
pipeline.
h)Thiswillconcludetheinstallation.



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MF5100V

UserManual

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Cautions
a)Don'talteranypartsoftheproduct.
b)Ensuretheelectricalconnectionisproperlydonepertheinstructions.
c)Makesurenomechanicalstressesintheconnections.
d)Thestrongelectromagneticinterferencesourcesclosebyoranymechanicalshocksatthe
pipelinemayalsocreatemalfunctioningoftheproduct.
e)Slowlyopen/closevalvestopreventabruptpulseflowimpact.



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MF5100V
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UserManual
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6. Operation

6.1 Checktheproductspecifications

Beforestartingtousethisproduct,checktheproductspecificationsthatcanbefoundinthismanual
orthebasicinformationlocatedonthebackpaneloftheproduct.
ThedetailedproducttechnicalspecificationscanbefoundinSection8.Foraspecificapplication,the
pressureratingmustnotbehigherthanthesystempressuretobemeasured,andtheflowrange
shouldalsobewithinthespecifiedones.Inmostcases,theuseofahighfull‐scalerangedmeterfor
theverylowflowratemeasurementoftenresultsinerroneousdata.Thegastobemeasuredmust
alsobeconsistentwiththatspecifiedbytheproduct.Beparticularlycautiousaboutthesupplied
voltageindicatedinthespecification.Ahighervoltagemayleadtoirrecoverabledamage,anda
lowervoltagewillnotpowertheproductforanydesiredfunctions.
Forthebestperformanceoftheproduct,itisadvisedthatthegastobemeasuredmustbecleanand
freeofparticlesorotherforeignmaterials.

6.2 Checktheleakage

Checkgasleakagebeforeanymeasurement.Ifitisneeded,thepressurizednitrogenoraircanbe
usedfortheleakagecheck.

6.3 Powerthemeteranddigitaldataconnection

AlthoughthisproductcomplieswiththeCE‐requiredEMCregulations,fortheoptionsofexternalDC
powersupply,italsorequirestheproducttobeusedaccordingtothestandardelectricaldevice
practice.BeforeconnectingthemeterwithexternalDCpoweroranAC‐DCadapter,makesurethe
supplyvoltageiswithintherangeofthespecifiedonesinSection8.Becautiousthatthestandard
electricaldeviceprecautionssuchasEDS(electrostaticdischarge)andDCvoltageareobserved.
Excessiveelectrostaticdischargemaydamagetheproduct.
Usethepowerswitchtoswitchoffthepowerwhenitisoperatingwiththebatteryanditwillbeidle
foralongerperiodfortheultimateoptimizingthebatterypower.Otherwise,althoughthemeteris
configuredwithlowpoweroperation,atidlestatus,themeterwillattempttodetecttheflowrate
fromtimetotimetoensurealldatacanbeproperlyregistered.


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MF5100V

UserManual

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Themanufacturer‐suppliedpoweranddatacablehavealockingfixture.Lockthecableandmake
sureitisproperlyengagingandwillnotbeaccidentallygotunplugged.
Half‐duplexRS485Modbusisusedfordigitaldatacommunication.Makesurethewiresareproperly
connectedatthereceiverside.

6.4 Controltheflowratewiththemanualvalve

Themanualcontrolofthepreciseflowrateisviathemechanicalvalvewitha16turnhighprecise
fromfullyclosetofullyopen,aslongasitiswithinthespecifiedpressure.Turnthevalveslowlyfor
thedesiredcontrolvalues.Becarefulwiththeparticlecontaminationthatmayjamthevalvepassage
leadingtocontrolfailures.

6.5 Startingthemeasurement

Oncethepowerissupplied(eitherviabatteryorexternalDCpower)andnoabnormalissuesare
observed,themeterisreadytoperformthemeasurements.Thedefaultdisplayisforthemassflow
measurementhavingtwonumericallinesontheLCD.Themiddlelineisthetotalizeroraccumulated
flowrate,andthelowerlineistheinstantflowrate.Theupperlineshowsthetemperature,meter
address,andbatterystatus.




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MF5100V
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6.6 RS485Modbuscommunicationprotocol

ThedigitalcommunicationprotocolisbasedonstandardModbusRTUHalf‐plexmode.Amaster(PC
orPLC)cancommunicatewithmultipleslaves(thecurrentproduct)fordataexchangeand
communicationparameterconfiguration.RefertoTable3.3forcableconnection.
6.6.1 Hardwareconnection

ThehardwarelayerisTIA/EIA‐485‐A,asillustratedbelow.Inthisconfiguration,theproduct(MF5100)
isaslave.

6.6.2 Communicationparameters

ThePCUARTcommunicationparametersarelistedinthefollowingtable.
ParametersProtocol

RTU

Baudrate(Bitspersecond)

9600bps

Startbits1

Databits8
Stopbits1
Even/OddparityNone
Bitsperiod104.2µsec
Bytesperiod1.1458msec
Maximumdatalength20
Maximumnodes247


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MF5100V
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UserManual
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6.6.3 Frame

TheframefunctionisbasedonthestandardModbusRTUframing:
Start_bitsAddressFunctioncodesDataCRCStop_bits
T1‐T2‐T3‐T48bit8bitN8bit(20≥n≥0)

16bitT1‐T2‐T3‐T4

Start_bits:4periodsbittime,foranewframe.
Address:Theaddresscanbesetfrom0to247exceptfor157(0x9d).0isthebroadcast
address.
Functioncodes:Definetheproduct(MF5100)'sfunctions/actions(slaves),eitherexecutionor
response.
Data:Theaddressoftheregister,lengthofdata,andthedatathemselves.
CRC:CRCverificationcode.Thelowbyteisfollowedbythehighbyte.Forexample,a
16bitCRCisdividedintoBYTE_HandBYTE_L.Intheframing,theBYTE_Lwill
comefirst,thenfollowedbytheBYTE_H.ThelastoneistheSTOPsignal.
Stop_bits:4periodsbittime,forendingthecurrentframe.

6.6.4 Functioncodes

TheModbusfunctioncodesappliedfortheproductarethesub‐classofthestandardModbus
function‐codes.Thesecodesareusedtosetorreadtheregistersoftheproduct:

CodeNameFunctions
0x03ReadregisterInt,char,floatReadregister(s)
0x06SetsingleregisterInt,char,floatWriteonesingle16‐bitregister
0x08CRCverificationIntVerifythecommunication
0x10Setmultipleregisters

Int,char,floatWritemultipleregisters



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6.6.5 Registers

Theproduct(MF5100)hasmultipleregistersavailablefortheassignmentofthevariousfunctions.
Withthesefunctions,theusercanobtainthedatafromtheproducts,suchasproductaddressand
flowratesfromtheregisters,orsettheproductfunctionsbywritingthecorrespondingparameters.
Thecurrentlyavailableregistersarelistedinthefollowingtable,andtheregistersmaybecustomized
uponcontactthemanufacturer.WhereR:read;W:write‐only;W/R:readandwrite.
Note:Atthetimeofshipping,thewriteprotectionfunctionisenabledexceptforaddressand
baudrate.Oncetheusercompletestheregistervaluechange,thewriteprotectionwillbe
automaticallyenabledonceagaintopreventincidentaldataloss.
FunctionsDescriptionRegisterModbus
reference
Address Productaddress(R/W)0x008140130(0x0081)
SerialnumberSerialnumberoftheproduct0x0030~0x003540049(0x0030)
FlowrateCurrentflowrate(R)

0x003A~0x003B40059(0x003A)

TotalizerTotalizeroraccumulatedflowrate(R)0x003C~0x003E40061(0x003C)
MaximumflowrateSetmaximumflowrate(R/W)0x0085~0x008640134(0x0085)
GCFGascorrectionfactor(R/W)0x008B40140(0x008B)

GC_gasGasidentification,gas(R/W)0x005340084(0x0053)
GC_airGasidentification,air(R/W)0x009140146(0x0091)
GC_thresholdGasidentificationlimit(R/W)0x009240147(0x0092)
PulserateSetpulserate(totalizerflowrate)(R/W)0x009340148(0x0093)
WriteprotectionWriteprotectionofselectedparameters(W)

0x00FF

40256(0x00FF)


Thedetailedinformationofeachregisterisdescribedbelow:Y:enabled;N:disabled
Address0x0081WriteY
ReadY
DescriptionAddressoftheproduct
ValuetypeUINT16
NotesValuesfrom1to247exceptfor157(0x9d).0isthebroadcastaddress.

Serialnumber,SN0x0030…0x0035Write

N
ReadY
DescriptionSeriesNumberoftheproduct,SN

ValuetypeUINT8(12bits)
Notes
SN=value(0x0030),value(0x0031),….,value(0x0035);
Receiving12bitsas:2A473741454930323035382A,thecorresponding
SerialNumberis*G7AEI02058*.



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Flowrate0x003A~0x003BWriteN
ReadY
DescriptionCurrentflowrate
ValuetypeUINT16
Notes
Flowrate=[Value(0x003A)*65536+value(ox003B)]/1000
e.g.:foraflowrateof123.456SLPM,theuserwillread“1(0x0002)”from
register0x003Aand“57920(0xE240)”fromregister0x003B,therefore
Currentflowrate=(1*65536+57920)/1000=123.456

Totalizer0x003C~0x003EWriteY
Read

Y
DescriptionTotalizeroraccumulatedflowrate
ValuetypeUINT32+UINT16
Notes
Totalizeroraccumulatedflowrate
=Value(0x003C)*65536+Value(0x003D)+Value(0x003E)/1000
e.g.:foratotalizeroraccumulatedflowrateof3452.245m3,theuserwillread
“0(0x0000)”fromregister0x003C;“3452(0x0D7C)”fromregister0x003D,and
“245(0x00F5)”fromregister0x003E.
Then,thetotalizeroraccumulatedflowrate
=((0+3452)*1000+245)/1000=3452.245.

Maximumflowrate0x0085~0x0086WriteY
ReadY
DescriptionSetthemaximumflowratelimit
ValuetypeUINT16
Notes
Maximumflowratelimit=(Value(oxoo85)*65536+Vlaue(0x0086))/1000
e.g.:tosetamaximumflowratelimitof30SLPM,writeotoregister0x0085,
andwrite30000toregister0x0086.Thenthevaluewillbe
(0*65536+30000)/1000=30

GCF0x008BWriteY
ReadY
DescriptionThegasconversionfactorforusingwithgasdifferentfromcalibrationgas
ValuetypeUINT16
Notes
Theair(default)is1000,normallyreadfromregister0x008B.
Theproductwilldisablethisfunctionwithwriteprotectiononcethe
meteringgasisconfirmedwiththeproperGCF.ForaspecificGCFvalue,
pleasecontactthemanufacturer.

GC_gas0x53WriteY
ReadY
DescriptionThisvalueisassignedforaspecificgasatthetimeoforder
ValuetypeUINT16

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Notes
Thedefaultvalueformethaneornaturalgasis35800±200,andforCO2is
29200±200.Forothergases,pleasecontactthemanufacturer.Onceitisset,
themetercanautomaticallyswitchthecalibrationbetweenair(calibratedgas)
andthesetgas.

GC_air0x91WriteY
ReadY
DescriptionThisvalueisthegasIDforair
ValuetypeUINT16
NotesThedefaultvalueis32768±200.Thisvaluemaybedependentontheactual
offsetvalueofthemeter.

GC_threshold0x92WriteY
ReadY
DescriptionSetalimitforthegasswitch
ValuetypeUINT16
Notes
Thedefaultvalueis1000,andthemaximumof10000.
Forexample:
IfGC_gas≥GC_air+GC_threshold,orGC_gas≤GC_air+GC_threshold,then
Flowrate_gas=flowrate_air*GCF/1000,andthe“GAS”symbolwillbedisplayed
ontheLCD,replacingthemeteraddressvalue.
IftheGC_thresholdissettobe10000,thisfunctionwillbedisabled.

Pulse0x93WriteY
ReadY
DescriptionSetthepulseratefortotalizedflowrate
ValuetypeUINT16
Notes
Thedefaultvalueis100or10mL/pulse.Availablevaluesare:
1=0.1mL;10=1mL;100=10mL;1000=100mL;and10000=1000mL(1L)per
pulse.


Writeprotection0x00FFWriteY
ReadN
DescriptionWriteprotectiondisablerforasetvaluetoaspecificregister.
ValuetypeUnsignedint,Fixedvalue0xAA55
Notes
Thisfunctionisenabledatthetimeofproductshipment.Toenablethewrite
functionofaspecificparameter,suchasGCF,theuserneedstosend0xAA55
totheregister0x00FF,andthenthewritefunctionwillbeenabled(write
protectionisdisabled).Afterthewriteexecutioniscompleted,thefirmware
willautomaticallyre‐enablethewriteprotection.

OnlyAddresswillnotbewrite‐protected.
