Spirax Sarco LD357BL Series User manual

EXPERTISE SOLUTIONS SUSTAINABILITY
3.887.5275.240 EMM Issue 4 - 2018
© Copyright 2016
Level Transmitter
Series LD357BL
Installation and Maintenance Instructions
1. Safety information
2. Introduction
3. Description
4. Operations
5.Conguration
6. Maintenance and
 Troubleshooting
7.Marking
8. Data Sheet

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1. Safety information
Safeoperationoftheseproductscanonlybeguaranteediftheyareproperlyinstalled,commissioned,
usedandmaintainedbyqualiedpersonnel(seeSection1.11 on this document) in compliance
withtheoperatinginstructions.Generalinstallationandsafetyinstructionsforpipeline andplant
construction,aswellastheproperuseoftoolsandsafetyequipmentmustalsobecompliedwith.
1.1 Intended use
The trasmitters object of the present instructions comply with the directive ATEX 2014/34/UE and
arecharacterizedbythefollowingmotodhdsofprotection:
II1GExiaIICT6Ga
TheyaresuitableforinstallationinZone0,Zone1,Zone2.
For connections and installation refer to this manual.
1.2 Access
Ensuresafeaccessandifnecessaryasafeworkingplatform(suitablyguarded)beforeattempting
toworkontheproduct.Arrangesuitableliftinggearifrequired.
1.3 Lighting
Ensureadequatelighting,particularlywheredetailedorintricateworkisrequired.
1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some previous time.
Consider:ammablematerials,substanceshazardoustohealth,extremesoftemperature.
1.5 Hazardous environment around the product
Consider:explosion risk areas,lack of oxygen(e.g. tanks, pits),dangerous gases, extremesof
temperature,hotsurfaces,rehazard(e.g.duringwelding),excessivenoise,movingmachinery.
1.6 The system
Considerthee󰀨ectonthecompletesystemoftheworkproposed.Willanyproposedaction(e.g.
closingisolationvalves,electricalisolation)putanyotherpartofthesystemoranypersonnelatrisk?
Dangersmightincludeisolationofventsorprotectivedevicesortherenderingine󰀨ectiveofcontrols
oralarms.Ensureisolationvalvesareturnedonando󰀨inagradualwaytoavoidsystemshocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure. Consider double
isolation(doubleblockandbleed)andthelockingorlabellingofclosedvalves.Donotassumethat
thesystemhasdepressurisedevenwhenthepressuregaugeindicateszero.
1.8 Temperature
Allowtimefortemperaturetonormaliseafterisolationtoavoiddangerofburns.
1.9 Tools and consumables
Beforestartingworkensurethatyouhavesuitabletoolsand/orconsumablesavailable.Useonly
genuineSpiraxSarcoreplacementparts.

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1.10 Protective clothing
Considerwhetheryouand/orothersinthevicinityrequireanyprotectiveclothingtoprotectagainst
thehazardsof,forexample,chemicals,high/lowtemperature,radiation,noise,fallingobjects,and
dangerstoeyesandface.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person. Installation and
operatingpersonnelshouldbetrainedinthecorrectuseoftheproductaccordingtotheInstallation
and Maintenance Instructions.
Whereaformal‘permittowork’systemisinforceitmustbecompliedwith.Wherethereisnosuch
system,itisrecommendedthataresponsiblepersonshouldknowwhatworkisgoingonand,where
necessary,arrangetohaveanassistantwhoseprimaryresponsibilityissafety.
Post‘warningnotices’ifnecessary.
1.12 Electrical work
Beforestartingworkstudythewiringdiagramandwiringinstructionsandnoteanyspecialrequirements.
Considerparticulary:mainssupplyvoltageandphase,local mains isolation, fuse requirements,
earthing,specialcables,cableentries/cableglands,electricalscreening.
1.13 Commissioning
Afterinstallationormaintenanceensurethatthesystemisfullyfuctioning.
Carry out test on many alarms or protective devices
1.14 Disposal
Unwanted equipment should be disposed of in a safe manner.
1.15 Returning products
CustomersandstockistsareremindedthatunderECHealth,SafetyandEnvironmentLaw,when
returningproductstoSpiraxSarcotheymustprovideinformationonanyhazardsandtheprecautions
tobetakenduetocontaminationresiduesormechanicaldamagewhichmaypresentahealth,safety
orenvironmentalrisk.ThisinformationmustbeprovidedinwritingincludingHealthandSafetydata
sheetsrelatingtoanysubstancesidentiedashazardousorpotentiallyhazardous.

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2. Introduction
2.1 Product Overview
TheSpiraxSarcoLDSerieselectronictransmittersaredevicesthatuseasensortomeasurepressure,
levelandtemperature,andtransmitacurrentsignal(4÷20mA)proportionaltothemeasuredvariable.
TheLDSeriesconsistsofthefollowingmodels:
TT352 Electronic temperature transmitter
LD256 Electronic pressure transmitter
LD357B Electronicdi󰀨erentialpressuretransmitter
LD357BL Electronic level transmitter
2.2 Attention!
ThismanualdoesnotcontaininformationconcerningalltypeofTransmitteroralldi󰀨erentinstallation
and/orworkingandmountingsolutions.
Formoreinformationorforparticularproblemsnotconsideredinthismanual,pleaseaddressto
ourtechnicalo󰀩ce.
Thewarrantyperiodistheonecontemplatedinourgeneralservicingconditions.
This warranty is neither increased nor restricted by the contents of this manual.
ThisTransmitterhastobeinstalledandusedonlybyqualiedpersonswhohaverstcheckedthe
correctnessofsupplyvoltagesothatbothinstandardworkingconditionsandinpresenceofdamages
oftheplantorofanypartofit,nodangerousvoltagecanreachtheTransmitter.
AstheTransmittercanbeutilizedbothwithhighpressurevaluesandwithaggressivemediaitmust
beconsideredthatanincorrectuseofitcouldbringevenseriousdamagestopeopleandthings.
Acorrectandsafeworkingneedsanadequatetransport,stockandmountingotherthananappropriate
maintenance service.
SoitisnecessaryforthepeoplehandlingtheseTransmittertohaveknowledgeandexperiencein
mounting,servicingandworkingandtohavetitletodotheirjobwithreferenceto“SafetyStandards“.

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2.3 DenitionsandSymbols
Inthismanualareusedthefollowingsymbolsandlabels:
Equipmentforuseinpotentiallyexplosiveatmospheres
II 1G EquipmentGroupIICategory1G,suitableforpotentiallyexplosiveZone0area
(gases,vapoursormists)andwithredundancyforzone1and2
Ex ia Equipmentprotectionbyintrinsicsafety,levelofprotection"ia"
IIC GroupIICapparatus,tforsubstancesofgroupIIC,IIBandIIA
TemperatureClassofthetransmitter(maximumsurfacetemperature)
T6, onlywhenusedintheambienttemperaturerange-40°C÷40°C
T5, onlywhenusedintheambienttemperaturerange-40°C÷55°C
T4 onlywhenusedintheambienttemperaturerange-40°C÷80°C
Ga Equipmentwithequipmentprotectionlevel(EPL)"Ga"
Warning!
Warning label, used to warn about hazardous materials, locations, or objects,
includingelectriccurrents,poisons,andotherthings.
Prohibition!
Prohibitionlabel,usedtoindicatesomethingisnotpermitted.
Mandatory!
Mandatorylabel,usedtosetobligationtaskstobeperformedbytheuser.
Information!
Informationlabel,usedtosetgeneralinformationfortheuserorwarnaboutha-
zards for the equipment.

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3. Description
The LD357BL series SMART di󰀨erential pressure transmitters are microprocessor based
instrumentsthatcombinetheanalogsignaladvantages(4-20mA)togetherwiththeexibilityof
digitalcommunicationusingHART®protocol.They can be remotely congured byauniversal
handheldterminal(HHT)orbyaPCwithadedicatedinterface.
Moreover,itispossibletolocallyconguretheinstruments(zeroandspan)bymeansofpush
buttonsandtodisplaythedataonthewideLCDdisplay.
ThetransmitterseriesLD357BL,measuredi󰀨erentialpressurewithspansfrom1.2to20000mbar
withastaticpressureupto200bar.Thepressuremeasuringelementisapiezoresitivesensor.It
is possible to choose a variety of sensors to satisfy all process conditions.
TheSpiraxSarcomeasuringcellcontainsthesensorandtransmitsthepressuretotheelectronics.
ThermaldriftiscompensatedusingthetemperaturesignalgeneratedbyaPTCthermistorintegrated
inthesensoritself.Basedonthesereadingsthemicroprocessorgeneratesthe4-20mAanalog
output"twowiressystem"anddisplaysthepressuremeasurementontheLCD.Someofthemain
characteristicsofthismicroprocessor-basedtransmitter,are:
- WideRangeability;
- Automatictemperaturecompensation;
- DigitalcommunicationusingHART®protocol.
Cable gland
Atmosphere side
Diaphragm
Nom
Range
(mbar)
Span
min/max
(mbar)
Range Limits
min/max
(mbar)
0/350 23/350 -350/+350
0/1000 67/1000 -1000/+1000
0/2500 167/2500 -2500/+2500
0/5000 333/5000 -5000/+5000
Enclosure
Fig.1-Di󰀨erentialpressuretransmitterLD357BL
Diaphragm

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4. Installation
4.1 TransmitterIdentication
Transmitterdatacanbefoundonthenameplatexedonthetopoftransmitterenclosure(seeMarking).
TheSerialNumbermustbequotedattheoccurrenceofaspecicrequesttothemanufacturer.
4.2 General mounting requirements
Priorinstallationshallbeobservedfollowingconsiderations:
- CheckwhetherTransmitter’soperatingconditionsarewithinthelimitsasreportedinthenameplate,
technicalspecicationssheetsand/orlabel.
- Make sure that the operating conditions are compatible with the specication given to the
manufacturer.
Mandatory!
- Formeasurementinthepresenceofparticularlyhotliquids(e.g.steam)make
surethattheTransmitterissuppliedwithasuitablennedarmorsiphon.
- Forviscousliquidsorthosecontainingsolidparticlesinsuspensionmakesure
thattheconnectiontotheprocessisasuitableoneinordertoavoidclogs.
Warning!
Directsunlightmaycauseseriousdamagestotheinstrument.
Never install standard Transmitter under the sun or in any other location which
couldcausedirectoverheatingthroughradiation.
Fig. 2 - Mounting requirements
Zone 0
Direct
Sunlight
Zone 0

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4.3 Mechanical Installation
TheTransmittershouldbelocated,ifpossible,atsomeeasilyaccessible,welllightedplaceonthe
vessel,inordertoallowputtinginoperationsandmaintenancework.Locationshouldalsobesuch
thatambienttemperatureattheTransmitterenclosurebenotexcessive(seeMARKING).
Information!
- Plantoverpressure/over-temperature:observeratingplate.
- Installationonseismicareas:informtechnicaldepartment.
- Incaseofunstableuids:informtechnicaldepartment.
- Incaseofdamages:informtechnicaldepartment.
- Inspection frequency: consideration should be given to applicable national
legislation.
Warning!
- Theprocessconnectionmustberealizedin suchawaythatguaranteesthe
holdatthemaximumworkingpressureandtemperature.
- Do not overcome the maximum pressure and temperatures indicated in the
technical data sheet of the selected model.
- Whenthedeviceisconnectedtotheprocessitcanbesubmittedtohighpressures
and temperatures. To avoid accidents subsequent to sudden discharge of
pressureand/ortocontactwithdangerousorammableuidsitisnecessary
totakethemaximumattentionwhentheTransmitteristakeno󰀨,heatedor
repaired,verifyingthatitisisolatedfromtheprocessandisnotsubmittedto
pressure and/or temperature.
4.4 Installation for relative pressure measurement
ThetransmittersLD357Bmaybeusedforrelativepressuremeasurementsorlevelmeasurements
intanksorpiping.InFig. 3thesimplestmounting,directonpiping,isillustrated.
Warning!
- Remembertointroducealwaysasecurityvalveinordertoputinmaintenance
operations when necessary.
- Whentheconnectionsarelocatedonaverticalprocessline,theowshouldbe
upward.
Information!
Fig. 3 and Fig. 4 show some of the installations recommended by ISO 2186
Standards.RefertothisStandardformoreinformation.
Mandatory!
- PressureconnectionsonmodelSST57BLaremarkedwith"H"("+")and"L"("-");
thehigherpressurewillbeappliedto"+"side.
- Alwayscheckcarefullyallmanifolds,reducersifany,ventsanddrainplugsfor
leaks.

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Fig. 3 - Level measurement in open vessels
Fig. 4 - Level measurements in closed vessels
Tank pressure
+ side
- side (ATM)
- side
+ side

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4.5 Electronic head orientation
Inordertorotatetheelectronicheadinthedesiredpositionyoumustfollowthesepassages(Fig. 5):
• unscrewthe2stopdowels(A)withkeyCH.2;
• byhandgentlyrotatetheenclosure(B)inthedesiredposition;
• oncethedesiredpositionisreachedxthestopdowels(A)againwiththesamekey.
Information!
- ReferringtoFig. 4:thedescendingpipescanbelledwithcondensatevapors
oftheprocessuidorwithsuitableinertliquidtopreventdirectcontactwiththe
transmitterdiaphragm.
Fig. 5 - Rotating the transmitter head
Information!
Itisnotnecessarytoturno󰀨thesupply.

11
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4.6 Electrical connection
Undertherearcapisplacedtheterminalblockreportingtheelectricpolarity(Fig. 6).
Insertthepowersupplycableintotheenclosurethroughoneofthetwothreadedopenings.Transmitter
is protected from accidental inversion of polarity. For a better use is recommended a twisted pair
cable(22AWGmin).AvoidplacingTransmitterneardevicespoweredinACorSwitching.Connect
ground-tapoftheTransmittertothelocalcommonearth(PE)asindicatedinparagraphEarthing.
Warning!
Thethreadedopeningthatisnotusedmustbesealedusingasuitablecap.
Thecapsincludedinthedeliveryareonlyforprotectionduringtransport.
Fig. 6 - Electrical connection of the power cable to the terminal block
Information!
Impedance of the cables denes the possible maximum length for digital
communication.It'srecommendedusingcablewithalowimpedance.Themaximum
lengthofthepointtopointconnection,withaloadof250ohmandsingletwisted
cable22AWG-207pF/mit'sabout1000meters.
Themaximumconnectionlengthfortheanalogsignalonlyislimitedbytheloads
(connecteddevicesandcable)presentinthecurrentloop.
Toobtainoutputsignalof4-20mA,youhavetodeterminetheminimumsupplyvoltageasafunction
oftheloadrelation:seeFig. 7.Fromthefollowingformulayoucanachievetherightminimumvalue
ofsupplyvoltage:
Vdc = 0.0215xR + 12
Where:R=outputload[Ohm].
The power supply source to assure a minimum current value of 24 mA.
Loop4-20mA
For remote indicator
(OPTIONAL)
Earthing
Loop
4-20mA

12 3.887.5275.240
Mandatory!
Inordertoobtaina4÷20mA+Hart®output a minimum load of 250 Ohm is required.
TAG -1 2 3 4
Vdc 12.5 17.4 24 25.2 30
Ohm 23 250 558 615 837
Fig. 7 - Operating area for Ex ia protection
TheelectronictransmitterstotallycomplywiththeHART®protocolspecicationRevision6.0,sothey
includeremoteprocessvariableinterrogation,parametersettinganddiagnostics.
Thedeviceisa4÷20mA2-wiretransmitter,withFSKcommunication.
ItispossibletoreadviaHART®thefollowingvariables:
PV:transmittermainmeasure;
SV:%ofthespan;
TV:analogoutput;
QV: electronic board temperature.
Please refer to Fig. 8forthe4÷20mA+Hart®modem connection.
In Fig. 9 the Hart®connection type is shown.
ItispossibletopurchasetheHartServerasanadditionalproduct;thisisasoftwareincludingallthe
interrogation,congurationanddiagnosticsfunctionsrequiredbytheHart®specication.
Operating area
Vdc

13
3.887.5275.240
Information!
Ref.toFig. 8:onlyonetransmittercouldbeconnectedtoeachbarrier.
Ref.toFig. 9:uptothreetransmitterscanbeconnectedtoeachbarrierwitha
maximumof5Exiabarriers.
Fig. 8 - 4÷20 mA + Hart®modem connection with Ex ia barrier
Fig. 9 - Only HART®Multidrop connection
ATEX
ZONE
NORMAL
ZONE
ATEX
ZONE
NORMAL
ZONE

14 3.887.5275.240
Fig. 10 - DCS connection
Mandatory!
Transmitter response time is <256ms.
DCSPollingtimemustbesetapproximatelyat800msinordertoavoidupdating
problemsbothinanaloganddigitalmeasurement.
OnrequestthetransmittercanbesuppliedinordertosupportaPollingtimeof
500ms but with a minimal consumption of 5 mA.
4.7 Intrinsic Safety Protection
In case of use in areas with danger of explosion, it must be veried that the identied type of
transmittertsfortheclassicationofthezoneandforthepresenceofammablesubstancesin
theplant(seeMARKING).
Thesafetyessentialrequisiteagainsttheriskofexplosionintheclassiedareasarexedfromthe
EuropeanDirectives2014/34/EUof26February2014(asfarasitconcernsthe'Equipment')and
1999/92/ECofDecember16th1999(asfarasitconcernsthe'WorkingEnvironment').
Warning!
Fortheelectricalconnectionspleasefollowtheinstructionsbroughtinthisoperator
manualstakingcarethatfortheuseinclassiedareasitisnecessarytoforesee
thestandardEN60079-14.
Prohibition!
Avoidanyignitionhazardduetoimpactorfriction(EN60079-0:2012§8.3).
Iftheprotectiveguardoranypartofthedeviceisdamagedbyimpactorfriction,
the type of protection is invalidated.
Fortheuseofthetransmitterinhazardousarea,youmustconsidertheuseofassociatedapparatus
(barrier),certiedaccordingtoEN60079-11,withelectricaloutputcompatiblewiththemaximum
inputparametersofthetransmitter(shownbelow).

15
3.887.5275.240
Theevaluationofthesystemformedbytheassociatedapparatus,thetransmitterandtheconnecting
cablesmustbeperformedbyexperiencedpersonnelandmustbeinaccordancewiththerequirements
ofEN60079-25concerningintrinsicallysafesystems.
For proper installation must take into account the safety instructions of the barrier used.
Warning!
Thechoiceoftheassociatedapparatushastobemadebasedonthemaximum
input parameters of the transmitter
Maximuminputparametersoftheequipment(relativetotheintrinsicallysafety):
Parameter Tamb
≤60°C
Tamb
≤80°C
Outputsignal 4÷20mA 4÷20mA
Inputvoltage
(V)30 V 25.2 V
Input current
(li)100 mA 100 mA
Input power
(Pi)0.75W 0.62W
Internal capacitance
(Ci)10 nF 10 nF
Internal inductance
(Li)Negligible Negligible
Information!
Thedevicehaspassedthetestofdielectricstrengthrequiredbytheharmonized
standardEN60079-11.Thetesthasbeencarriedoutbetweentheintrinsicallysafe
circuitandthecasingtoavoltageof500Vforatimeequalto60s.
Thehousingcontainingtheelectronicshaspassedthetestsrequiredbystandard
EN60529forthedegreeofprotectionIP66.

16 3.887.5275.240
4.8 Earthing
Warning!
Theearthconnectionisrequiredtopreventdamagetopeopleandmalfunction
of the instrument.
- Case 1: Installing the instrument in a plant devoid of earthing systems
 Inthecasewheretheplantdevoidofearthing,itisnecessarytoconnecttheearthwiretothe
terminalblockthroughthecablethatcarriesthesignalandthepowersupply(Fig. 6).
- Case 2: Installing the instrument in a plant provided with earthing systems
 Makesuretheearthing(GND)ofthesystemhastheleastresistancepossible.
You can add an additional earth wire with section not less than 4 mm2to ensure such connection.
Fig. 11 - 4 ÷ 20 mA loop connection with Ex ia barrier
Warning!
In the case represented in Fig. 12,withintheearthwiremayalsoscrollthrough
thecurrentprotectionofotherinstrumentswheretheearthingofthesystem(GND)
had not been carried out in an optimal manner.

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3.887.5275.240
Fig. 12 - Earthing in the housing
Warning!
Thehosemustnotbeconsideredasaprotectionagainstelectricshockforthe
protectionof security,butas protection against electromagnetic interferenceof
theinstrument.Therefore,inthecaseoflongdistancecable(L>20m),bothends
of the braid must be connected to the chassis or to the connectors. In the case
ofcablesL<20meters,willbesu󰀩cienttoconnectthebraidonlyfromtheside
“PowerSupply”.
Fig 13 - Earthing of the shield for cables longer than 20 meters

18 3.887.5275.240
5. Operations
5.1 Operations
Eachtransmitter is calibrated infactoryandhasonthe nameplate thecongurationdata.Ifnot
di󰀨erentlystatedinthepurchaseorderthetransmitterisconguredasfollow:
Upper Range Value(Higherpressurevalue):refertothedatasheetofunit
Lower Range Value(Lowerpressurevalue):refertothedatasheetofunit
Damping 0 sec.
5.2 Conguration
ThetransmittershowsthestatusandthemeasureonthedotmatrixLCD(Fig. 14).
Thespanisfrom-99999to999999.
Theinputsignaltothetransmittercanberelatedtotheoutputsignalinthefollowingways:
Direct mode =4÷20mAoutput
Reverse mode =20÷4mAoutput
Thedirectmodeisobtainedbysettingthelowerrangepointwiththelowestvalueoftherange(e.g.
0mmH20)andbysettingtheupperrangepointwiththehighestvalue(e.g.500mmH20).
Thereversemodeisobtainedbysettingthelowerrangepointwiththehighestvalueoftherange
(e.g.500mmH20)andbysettingtheupperrangepointwiththelowestvalue(e.g.0mmH20).
Itispossibletodisplaythetemperaturevalueofthecontrolboardbypressingthefollowingbutton
duringtransmitteroperation:
=electronicboardtemperature.
Theunitofmeasure(°C/°K/°F)isdenedintheentryTEMPUNITinthekeyboardmenu(Fig. 14).
Fig. 14 - LD357BL Display
Displayed value
Measuringunit
Choicebargraph/%span
Board temperature display
Menuentering
Bargraph/%SpanBargraph/%Span
Menuentering
Board temperature display
Choicebargraph/%span
Measuringunit
Displayed value

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3.887.5275.240
5.3 KeyboardConguration
The electronic transmitters have some conguration functions available via keyboard and LCD
display,providedwiththetransmittersthemselves.
Pressthe[MENU]buttontoenterthepasswordenteringdialog(thedefaultpasswordis0000).
Conrmby[OK]toenterthecongurationmenu.
Thedisplaywillallowtochoosefromthedi󰀨erentfunctionsdescribedinthetablebelow.Usethe
and buttonstoshowthesequenceoftheavailablefunctionsandpress[OK]toconrmthe
selected function.
Whenthedisplayisinnumericalenteringmode,thecursorwillblink.
To move the cursor press the ;button;toraisethevalueofthedigitpressthebutton. Press
the[OK]buttontoconrm;useinsteadthe[MENU]buttontocancelthemodicationsandtogo
back to the standard display.
Function Display
name Use Choice span
MaximumFS
owrate FMAX Function not available for this model -
Zerosetting LRV
Measure linked to the zero
and to the 4mA output. The
measuringunitisshowninthe
lowerrightcornerofthedisplay.
Between the sensor limits
Full span
setting URV
Measure linked to the full span
and to the 20mA output. The
measuringunitisshowninthe
lowerrightcornerofthedisplay.
Between the sensor limits
Measuringunit
selection
PV UNIT
(disabledin
volumetric
owmeters
mode)
Measuring unit selection from
the available ones. Press or
to scroll.
Pressure:
bar,mbar,Pa,
hPa,kPa,MPa,
mmH2O,mH2O,
cmH2O,Kg/cm2,
mmHg,psi,Torr,
inHg,Atm,
FtH2O,g/cm2,inH2O
Flow
m3/h
Sensor
Temperature
unit
TEMP UNIT
Temperature unit selection from
the available ones. Presso
to scroll.
°C,°K,°F
Congurationof
themeasuring
unittypology
XFR FUNC Notcongurableinthisseries.
LIN
SQRT=
volumetricowmeter

20 3.887.5275.240
Function Display
name Use Choice span
Fault
conguration
ALARM
TYPE
Fault condition analog output
selection.
NONE=noaction
21mA
3.85mA
LAST=lastreadvalue
Damping
setting
DAMP
VALUE
Insert the signal averaging time
constant. 0÷60s
Automatic
zero elevation OFFSET
Atthebuttonpushingthetransmitter
performs the zero elevation, in
manner to put to zero the actual
measure. The elevation is applied
to the whole span.
-
4mA input
automatic
setting(zero)
SET LRV
Atbuttonpushingthe transmitter
will automatically link the 4mA
output to the actual reference input.
-
20mA output
automatic
setting(span)
SET URV
Atbuttonpushingthetransmitterwill
automatically link the 20mA output
to the actual reference input.
-
Analogoutput
test
LOOP
TEST
Itispossibletoxtheanalogoutput
of the transmitter to a required mA
value.
3.85÷21mA
Analogoutput
calibration
CAL
4-20mA
The transmitter xes the output
to 4mA and asks by display to
check the value (OK? YES/NO).
Choose NO if the output is incorrect
and insert the value read on an
externalAmmeter.Doitagainuntil
necessary. The same procedure for
20mA follows.
-
Hart® Polling
address ADDRESS Hart®pollingaddressmodication.
0÷15
Theminimumpollingtime
is 8ms
Transmitter
information INFO
Thepollingaddress,thelowersensor
limit (LSL), the upper sensor limit
(USL) and the rmware revision
are shown.
-