Metal Samples MS2701E User manual

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MS2701E
High Resolution ER RS-485 Transmitter
Operator’s Manual
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Metal Samples Company
ADivision of Alabama Specialty Products, Inc.
152 Metal Samples Rd., Munford, AL 36268 Phone: [phone] Fax: [phone]
E-mail:[email protected] Internet: www.metalsamples.com

Table of Contents
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I.Introduction..............................................................................................................................................1
A.GeneralDescription...................................................................................................................1
B.PrinciplesofOperation..............................................................................................................1
C.TechnicalSpecifications.............................................................................................................3
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II.InstallationandOperation.......................................................................................................................4
A.ReceivingtheMS2701Etransmitter..........................................................................................4
B.Installation.................................................................................................................................4
1.PhysicalMountingandProbeConnection...................................................................4
a.Direct‐ProbeMounting
......................................................................................4
b.RemoteMounting..............................................................................................5
2.PowerandDataConnections.......................................................................................6
a.MakingConnections.........................................................................................6
b.Grounding.........................................................................................................7
c.SafeAreaInstallation........................................................................................7
d.HazardousAreaInstallation...............................................................................7
3.SetupandOperation.......................................................................................................9
a.ProbeSettings.................................................................................................9
b.RS‐485CommunicationSettings...................................................................10
i.BaudRateandDefaultCommunicationParameters.............................11
ii.DeviceAddress......................................................................................11
iii.CommunicationProtocols......................................................................11
iv.TerminationResistor.............................................................................11
v.DataRegisters.......................................................................................11
c.CalibrationandTesting.................................................................................12
i.Calibration...............................................................................................12
ii.Testingoutputzeroandspan.................................................................12
iii.TestingtheMS2701EtransmitterwiththeMeterProver.......................12
d.InterpretingData...........................................................................................13
i.MetalLoss................................................................................................13
ii.CalculatingCorrosionRate.......................................................................14
e.Commissioning..............................................................................................15
C.Maintenance............................................................................................................................15
D.Troubleshooting........................................................................................................................16
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III.ServiceandWarrantyInformation.......................................................................................................17
A.Warranty...................................................................................................................................17
B.ObtainingServiceandReturningtheInstrumentforRepair....................................................17
C.InstrumentRepairForm............................................................................................................18
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AppendixA‐Drawings...............................................................................................................................19
ControlDrawing(HazardousAreaWiringDiagram)–StandAlone.............................................20
ControlDrawing(HazardousAreaWiringDiagram)–Multi‐Drop...............................................21
SafeAreaWiringDiagram.............................................................................................................22
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AppendixA–RevisionHistory...................................................................................................................23

1
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I.Introduction
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A.GeneralDescription
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ThemodelMS2701E transmitterisahighresolutioninstrumentdesignedtomeasureandtransmit
corrosion(metalloss)datafromanElectricalResistance(ER)probetoaplantcontrolsystemorother
recordingdevice.TheMS2701E transmitterutilizesRS‐485communicationwhichallowsmultiple
unitstobedaisy‐chained,simplifyinginstallationandreducingassociatedcosts.TheuseoftheRS‐485
protocolalsoallowsthetransmittertobeplacedgreatdistancesfromthecontrolsystemorrecorder
whilemaintaininggoodnoiserejection.Practicaldistancescanbeupto4000feet.Additionally,the
MS2701E transmitteroffersuser‐selectableRTUorASCIIcommunicationprotocolsmakingithighly
versatile.
TheMS2701E transmitteriscompatiblewithalltypesofMetalSamplesERprobes,aswellasany
standardERprobefromothermanufacturers.Unlikecompetitors’products,theMS2701E
transmitterdoesnotrequirefactorymodificationtoaccommodatedifferentprobetypes.Theprobe
typecanbeeasilychangedatanytimeusingtheon‐boardprobeselectionswitches(seepage9.)
TheMS2701E transmitterisavailableasdirect‐mountorremote‐mount.Thedirect‐mountversionis
mounteddirectlytotheERprobe.Thisoptionoffersthesimplestinstallationandminimizesnoise
problems.Theremote‐mountoptionallowstheMS2701E transmittertobemountedindependently
from(butincloseproximityto)theERprobe.Itisthenconnectedtotheprobeviaashortprobe
cable.(Seepages5and6formountingdiagramsandspecifications.)
B.PrinciplesofOperation

TheMS2701E transmitteroperatesontheElectricalResistance(ER)techniqueandisusedin
conjunctionwithanERprobe.TheERprobeutilizesaresistivesensingelementmanufacturedfrom
thematerialofinterest(oracloseapproximation)whichisexposedtoacorrodingenvironment.This
iscalledtheExposedorCorrodingElement.TheresistanceoftheExposedElementisdirectlyrelated
toitsthickness,soastheelementcorrodestheresultinglossofmetalcausesaproportionalincrease
intheelement’sresistance.TheprobealsocontainsaninternalReferenceElementwhichisusedto
compensatefortheinfluencesoftemperatureontheExposedElement.
TheMS2701E transmitterisdesignedtoworkwithanystandardERprobe,butitisrecommendedthat
CylindricalandLargeFlushtypeprobesbeusedtoensureoptimumperformance.Theirphysical
designplacestheReferenceElementincloserproximitytotheExposedElementcomparedtoother
probetypes,providingmoreeffectivetemperaturecompensationandthusreducingtheeffectsof
thermalnoise.
Becausetheyaredesignedtocorrode,ERprobesaresacrificialinnature.EachERprobewillhavea
finitelifethatisbasedontheelementthickness.ERprobesareavailableinanumberofgeometries
andthicknessesdesignedtosuitawidevarietyofapplications.Table1liststhecommonERelement
optionsavailablefromMetalSamplesandtheeffectivelifeofeach.

2
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ElementTypeCompatibilityThicknessProbeLife
(Span)
TubularLoopCompatible
42
84
WireLoopCompatible
4010
8020
Flush(Small)Compatible
4 2
8 4
20 10
CylindricalPreferred
10 5
20 10
50 25
Flush(Large)Preferred
52.5
10 5
20 10
40 20

Table1.StandardERProbeElements
TheMS2701E transmittermeasuresanERprobeutilizingahigh‐resolution,16‐bitmeasurement.
Thisallowstheunittodetectmuchsmalleramountsofmetalloss,thusrespondingfasterto
corrosioneventsandupsets.At16‐bitresolutiontheMS2701E transmittercanmeasuremetalloss
amountsassmallas0.0015%oftheprobelife.

MetallossreadingstakenbytheMS2701E transmitterareoutputasadigitalRS‐485signalwhich
canbefedintoaplantcontrolsystemorotherrecordingdevices.TheMetalLossisrepresentedby
a16‐bitdigitalvaluebetween0and65535,where:

0=0mils(0%MetalLoss)
65535=ProbeLife*inmils(or100%MetalLoss)
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*TheProbeLife(orSpan)oftheprobebeingused(seetable1above.)

TheMetalLossdatacanbeusedtocalculatethecorrosionratebetweenanyperiodsofinterest.
Thisiscoveredinmoredetailonpages13and14.MoreinformationonERprobes,theirtheory,
selection,andusecanbefoundonourwebsiteat http://www.alspi.com/erintro.htm.
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

3
C. Technical Specifications
Model MS2701E High Resolution ER RS-485 Modbus Transmitter
Physical Data
InstrumentWeight: 3.70 lb. (1.68 Kg)
Total Weight w/ Accessories: 5.76 lb. (2.61 Kg)
InstrumentDimensions: 8.0"H x 4.82"W x 3.45”D
(20.32cm H x 12.24cm W x 8.76”D)
OperatingTemperature: -4° to 158°F (-20° to 70°C)
StorageTemperature: -40° to 176°F (-40° to 80°C)
Enclosure Material: Cast Aluminum (Copper-Free)
MountingSpecifications: Direct probe mount or
Remote mount
(Up to a 2.5” (6.35cm) Dia. pole)
Performance Data
Measurement Type: ER measurement
Range: 0-100% of probe life
Resolution: 0.0015% of Probe Life (16-bit)
CycleTime: 75 Seconds
Electrical Data
PowerRequirements: 10 to 28 VDC
Maximum Probe Cable Distance: 30 ft (9.1 m)
Output Specifications: RS-485 Modbus, RTU or ASCII Protocol (Switch Selectable)
2400 / 4800 / 9600 / 19.2K Selectable Baud
32 Maximum Units (Addresses 1 to 32)
Hazardous Location Certifications – Transmitter
USA / Canada Conforms to ANSI/UL Std. 60079-0, 60079-11, 61010-1
CAN/CSA Std. E66079-0, 60079-11 & CAN/CSA C22.2 No. 61010-1
For Stand-Alone Use For Multi-Drop Use
Class I, Zone 1, AEx ia d IIC T4 Gb Class I, Zone 1, AEx ia d IIB T4 Gb
Zone 20, AEx ia d IIIC T130° C Da Zone 20, AEx ia d IIIB T130° C Da
-20° C ≤Ta ≤+70° C -20° C ≤Ta ≤+70° C
Europe and Worldwide For Stand-Alone Use For Multi-Drop Use
(ATEX and IECEx) II 1/2 G Ex ia d IIC T4 Gb II 1/2 G Ex ia d IIB T4 Gb
II 1/2 D Ex ia d IIIC T130°C Da II 1/2 D Ex ia d IIIB T130°C Da
- 20°C ≤Ta ≤+ 70°C - 20°C ≤Ta ≤+ 70°C
ATEX Certificate No: ITS14ATEX28092X
IECEx Certificate No: IECEx ITS 14.0052X
X - see Special Conditions (page 7)
Hazardous Location Certifications – Enclosure
Case Specifications: Explosion Proof (FM, CSA, CENELEC, UL)
IP 66, NEMA 4X, 7BCD, 9EFG
Included Accessories (Direct-Mount Model)
Meter Prover, Operations Manual
Included Accessories (Remote-Mount Model)
Meter Prover, Operations Manual, Probe Cable, Mounting Hardware Kit
Recommended Accessories
RS-485 Isolating Power Supply (Metal Samples Part # ET1548)
RS-485 Isolating Signal Repeater (Metal Samples Part # ET1549)
4.82”W
(12.24cm)
8.0”H
(20.32cm)
Figure 1. Overall Dimensions
3.45”D
(8.76cm)

4

II.InstallationandOperation

A.ReceivingtheMS2701ETransmitter

ChecktheMS2701E Transmitterforanyshippingdamagewhenitisfirstreceived.Whentheunitis
unpacked,verifythatthefollowingitemsareincluded:

Transmitter
MeterProver
User’sManual
ProbeCable(forremote‐mountonly)
MountingHardware(forremote‐mountonly)

Intheeventofshippingdamage,quantityshortage,ormissingitems,itisrecommendedthatthe
eventisdocumentedimmediatelyandthatdigitalphotographsaretaken.Anyshortagesormissing
itemsshouldbereportedtoMetalSamplesimmediately.Intheeventofshippingdamage,aclaim
shouldbeopenedwiththeresponsiblecarrier.
B.Installation

CAUTION:Usingthisproductinanywayotherthanthatspecifiedwithinthismanualmayimpairthe
intrinsicsafetyprotection.


InstallationoftheMS2701E transmitterinvolvesthefollowingsteps:

1. PhysicalMounting
2. ElectricalConnection
3. SetupandProgramming

1.PhysicalMountingandProbeConnection

WhenselectingalocationtomounttheMS2701E transmitteritisimportanttoconsiderthe
surroundingenvironment.Toensureproperoperation:

Donotmountthetransmitterinalocationthatexceedsitsoperatingtemperature.
Avoidmountingthetransmitternearsourcesofstrongelectricalnoise.
Ensurethatthereissufficientclearanceforinstallationandtoopenthetransmittercover
afterwards.

a.Direct‐ProbeMounting
TheMS2701E transmitterisdesignedfordirect‐probemountingwhicheliminatestheneedfor
additionalhardwareandtransmitter‐to‐probecabling.Thisgreatlysimplifiesinstallation,reduces
costs,andminimizeselectricalnoisethatcanbecoupledontoprobecablingfromnearbyelectrical
equipment.

BeforemountingtheMS2701E transmitter,firstensurethattheprobeisinstalledproperlyand
securely.Duringinstallationitisimportantthatyoudonotapplyexcessiveforceontheprobeor
seals,asdoingsocouldbreakthesealandresultinsystemleakage.
TomounttheMS2701E transmitter:

5


1. Alignthekeywaysofthetransmitterandprobeconnectors.
2. Insertthetransmitterconnectorplugfullyintotheprobeconnectorreceptacle.
3. Securethetransmittertothetopoftheprobebytighteningthecouplingnut.
NOTE:Hand‐tightissufficient.Donotover‐tightenthecouplingnut.
NOTE:Neverforcetheconnectorstomate.Ifthereisresistance,stopandcheckforbentpinson
theprobeandforforeignmaterialinthefemalesocketsofthetransmitterconnector.Gently
straightenanybentpinsandclearanyforeignmaterialthatmaybefound.




Figure2.DirectMountInstallation
b.RemoteMounting
Whenitisnotpracticaltodirect‐probemounttheMS2701E transmitter,theunitcanberemote
mountedinstead.Inthiscasetheinstrumentismountedtoaseparatemountingpoleusingthe
optionalRemoteMountingHardwareKit.ThetransmitteristhenconnectedtotheERprobeviathe
probeextensioncable.


















Figure3.RemoteMountInstallation
AlignKey
Insert
Connector
Tighten
CouplingNut
123

6

2.PowerandDataConnections

a.MakingConnections
TheRS‐485fieldwiringentersthetransmitterthroughthe1/2"femaleNPTconduitportshownin
Figure4below.

CAUTION:Whenusedinahazardousarea,theconduitorcableconnectionsmustbemadeinsuch
awaythatallhazardousarearequirementsaremet.CableGlandsandblankingplugsmustbe
certifiedforprotectiontypes‘d’,’tb’anditshouldberatedforIP66.




Figure4.RS‐485Connector
ElectricalconnectionsaremadetothemainPCBviatheterminalblocksJ2andJ9asshowninFigure6.

NOTE:DonotconnectcableshieldingtotheTransmitter.Theshieldmustremainfloatingatthe
Transmitter.

TheRS‐485protocolallowsupto32transmitterstobedaisy‐chainedwhichsimplifiesinstallationand
reducescosts.Figure5showsanexampleofatypicalarrangement.Fullwiringdetailsareshownon
pages21and22.

CAUTION:Besuretoobservetheappropriategasgroupratinglistedonpage3forstand‐aloneor
multi‐dropoperation.



Figure5.Typicaldaisy‐chainarrangement,where‘n’isthenumberofthelasttransmitter.
1/2” FNPTConduitPortfor
FieldWiringEntry
ProbeConnectorStem
orProbeCable

7

ThemaximumpermissiblelengthofthefieldwiringbetweentheMS2701E transmitterandthe
controlsystemisdeterminedbythecontrolsystemsupplyvoltage,theelectricalresistanceofthe
cableandtheloadofthecontrolsysteminput.IftheTransmitteristobeinstalledinasafearea,refer
tosectionc.SafeAreaInstallationfordetails.IftheTransmitteristobeinstalledinahazardousarea,
refertosectiond.HazardousAreaInstallation.

b.Grounding

TheMS2701E transmitterenclosureisgroundedinternallythroughthewiringharness,butan
additional,externalgroundingterminalisprovidedaswell.Theenclosureshouldbegrounded
properlyusingtheexternalgroundingterminaltoensuresafeoperation.

c.SafeAreaInstallation

TheMS2701E transmitterisapprovedforuseinhazardousareas,butcanbeusedinnon‐hazardous
areasaswell.Forbasicsafeareawiringinformationrefertothecircuitdiagramshownonpage21.


CAUTION:Whenusedinnon‐hazardousareas,equipmentmustbesuppliedwithapre‐approvedpower
supplyunitorapprovedequipmentwhichmeetstheentityparametersshownbelow.

Thepre‐approvedequipmentmustbecertifiedtotheelectricalsafetystandardsforequipmentin
ordinarylocations(forexample,EN/IEC/CSAUL61010‐1orEN/IEC/CSAUL60950‐1).Failuretomeet
theserequirementswillvoidtheintrinsicsafetycertificationoftheequipmentandprohibititsfuture
useinhazardousareas.


d.HazardousAreaInstallation


CAUTION:Thissectionprovidesgeneralguidelinesforhazardousareawiring.However,regardlessof
anythingstatedhere,theMS2701E transmittermustbeinstalledinfullcompliancewiththecontrol
drawinglocatedonpage20andallofthelocalarearequirements.


CAUTION:WhenusedinHazardousareas,equipmentmustbesuppliedwithapre‐approvedpower
supplyunitorapprovedequipmentviaacertifiedintrinsicallysafebarrieroragalvanicallyisolated
barrier)withthefollowingentityparameters.

Input supply terminal RS-485 channel CN1 and connector CN2 (Combined)
Connector CN1 pins A & B (J2 on PCB): Ci = 68uF
Ui = 23.6 Vdc Li = 0
Ii = 352.8 mA Co = 32uF
Pi = 2.3 W Lo = 1.2 mH
Ci = 0
Li = 0 Input supply terminal, RS-485 terminal
and connector CN2 (combined)
RS-485 channel at each line Ui = 23 Vdc
Connector CN1 pins D & E (J9 on PCB): Ii = 538 mA
Ui = 3.7 Vdc Pi = 0.7 W
Ii = 225 mA Ci = 68uF
Pi = 0.206 W Li = 0
Uo = 5 V Co = 32uF
Io = 51 mA Lo = 0.14 mH
Po = 64 mW

8

Probe connector
Connector CN2 (J1 on PCB):
Uo=5V
Io= 352.8 mA
Po= 0.44 W


SpecialConditions

1. Probedielectricrating<500Vr.m.s.Donotexceed.
2. Donotinstalltheprobe(exposedportionofthesensingelements)intheexplosiondust
atmosphere(GroupIII).
3. Networked(“daisy‐chained”)arrangementnotforuseinGroupIIC/IIICenvironment.
4. Upto32transmittersareallowedinthedaisy‐chainarrangement.
5. OnlyCertifiedcableglandsandblankingplugsofprotectiontypes‘d’and‘tb’shouldbeused.
ProtectionratingofIP66shouldbemaintained.


Wheneveranelectricallydrivensensorormeasuringdeviceisusedinapotentiallyexplosive
environmentthemeasuringsystemmustbeinstalledinsuchawaythatelectricalenergyiseither
effectivelyisolatedfromtheexplosiveenvironment(viaexplosive‐proofcontainers,cableconduits,
etc.)ortheamountofelectricalenergyproducedinthehazardousareamustbelimitedtoan
intrinsicallysafelevel.

LimitingelectricalenergyisthemostpracticalmethodofprotectingtheMS2701E transmitterwhenit
isinstalledinahazardousarea.IntheMS2701E transmitter,electricalenergylimitsaremaintainedby
theuseofappropriatesafetybarriersinstalledinthepoweranddatawiring.Thesafetybarriersmust
belocatedinthesafeareaneartheboundarybetweenthesafeandhazardousareas.Thesafety
barrierwillrepeatthesignalcurrentgeneratedbytheTransmitterandwillrelaythesignaltothedata
receivingstation.

Caution:WhenasafetybarrierisusedwiththeMS2701E transmitter,thetransmitterwiring
connectionsmustbeconnectedtothesafetybarrier’shazardousareaterminals.Allotherconnections
mustbemadetothebarrier’ssafeareaterminals.

ThetypeofrepeatersafetybarriersusedwiththeMS2701E transmitterdependsonthespecific
classificationofthehazardousenvironmentinquestion.However,theentityparametersmustmatch
thoseoftheMS2701E transmitter.



CAUTION:Forhazardousareainstallations,themaximuminductanceandcapacitanceofthefield
wiringbetweenthesafetybarrierandthetransmittercannotexceedtheentityparametersofthe
selectedbarrier.





9

3.SetupandOperation

a.ProbeSettings

Theprobeselectionswitchesarelocatedonthetopleftcornerofthemainboardasillustratedin
Figure6below.TheseswitchesareusedtosettheERprobetype.Theyalsoallowtheinstrumentto
beplacedintoseveraltestmodeswhichoutputfixedvalues,allowingverificationoftheoutputsignal.
Table2givestheswitchsettingsforeachprobetypeandthevarioustestmodes.



Figure6.ConnectorandSwitchDetails

Switch1

Setting
Position
1 2 3 4
Operating
Positions
Wire Loop Off (↓)On (↑) On (↑) Off (↓)
Tube Loop/Flush On (↑) Off (↓)On (↑) Off (↓)
Cylindrical*Off (↓)Off (↓)On (↑) Off (↓)
Test
Positions
Zero Output (0) On (↑) On (↑) Off (↓)Off (↓)
Maximum Output
(65535) Off (↓)On (↑) Off (↓)Off (↓)
Full Scale Sweep On (↑) Off (↓)Off (↓)Off (↓)

Table2.ProbeSwitchSettings
*Cylindricalprobesettingisillustrated.
Switch1‐Probe
SelectionSwitch
(SeeTable2below)
PowerConnector
(J2)
ProbeCableConnector
(J1)
DataConnector
(J9)
Switch2‐ RS‐485
ConfigurationSwitches
(SeeTable3below)

10

b.RS‐485CommunicationSettings

TheRS‐485configurationswitchesarelocatedonthetoprightcornerofthemainboardasillustrated
inFigure6.Theseareusedtosettheinstrumentaddress,baudrate,communicationprotocol,andto
enabletheterminationresistor.Table3givestheswitchsettingsforeachoftheseparameters,and
theyareexplainedinmoredetailbelow.

Switch2
Device
Address
Position
34567
1Off (↓)Off (↓)Off (↓)Off (↓)Off (↓)
2On (↑)Off (↓)Off (↓)Off (↓)Off (↓)
3Off (↓)On (↑)Off (↓)Off (↓)Off (↓)
4On (↑)On (↑)Off (↓)Off (↓)Off (↓)
5Off (↓)Off (↓)On (↑)Off (↓)Off (↓)
BaudRatePosition6On (↑)Off (↓)On (↑)Off (↓)Off (↓)
127Off (↓)On (↑)On (↑)Off (↓)Off (↓)
2400On (↑)On (↑)8On (↑)On (↑)On (↑)Off (↓)Off (↓)
4800Off (↓)On (↑)9Off (↓)Off (↓)Off (↓)On (↑)Off (↓)
9600On (↑)Off (↓)10On (↑)Off (↓)Off (↓)On (↑)Off (↓)
19200Off (↓)Off (↓)11Off (↓)On (↑)Off (↓)On (↑)Off (↓)
12On (↑)On (↑)Off (↓)On (↑)Off (↓)
Communication
Protocol
Position13Off (↓)Off (↓)On (↑)On (↑)Off (↓)
814On (↑)Off (↓)On (↑)On (↑)Off (↓)
ASCIIOn (↑)15Off (↓)On (↑)On (↑)On (↑)Off (↓)
RTUOff (↓)16On (↑)On (↑)On (↑)On (↑)Off (↓)
17Off (↓)Off (↓)Off (↓)Off (↓)On (↑)
Termination
Resistor
Position18On (↑)Off (↓)Off (↓)Off (↓)On (↑)
1019Off (↓)On (↑)Off (↓)Off (↓)On (↑)
ActiveOn (↑)20On (↑)On (↑)Off (↓)Off (↓)On (↑)
InactiveOff (↓)21Off (↓)Off (↓)On (↑)Off (↓)On (↑)
22On (↑)Off (↓)On (↑)Off (↓)On (↑)
ReservedPosition23Off (↓)On (↑)On (↑)Off (↓)On (↑)
924On (↑)On (↑)On (↑)Off (↓)On (↑)
NotUsedN/A25Off (↓)Off (↓)Off (↓)On (↑)On (↑)
26On (↑)Off (↓)Off (↓)On (↑)On (↑)
27Off (↓)On (↑)Off (↓)On (↑)On (↑)
28On (↑)On (↑)Off (↓)On (↑)On (↑)
29Off (↓)Off (↓)On (↑)On (↑)On (↑)
30On (↑)Off (↓)On (↑)On (↑)On (↑)
31Off (↓)On (↑)On (↑)On (↑)On (↑)
32On (↑)On (↑)On (↑)On (↑)On (↑)

Table3.RS‐485ConfigurationSwitchSettings



11

i.BaudRateandDefaultCommunicationParameters

ThedefaultcommunicationparametersfortheMS2701E transmitterareprovidedinTable4below.If
necessary,thebaudratecanbechangedusingPositions1and2ofSwitch2,asillustratedinTable3.

ParameterValue
BaudRate19200
DataBits8
ParityEven
StopBits1

Table4.DefaultCommunicationParameters

ii.DeviceAddress

Upto32MS2701E transmittersmaybeconnectedinamulti‐dropnetwork(“daisy‐chained”)usinga
singlecablerun.However,eachtransmittermustbesettoauniquedeviceaddresstoavoidconflicts.
ThisisdoneusingPositions3through7ofSwitch2,asillustratedinTable3.

CAUTION:Besuretoobservetheappropriategasgroupratinglistedonpage3forstand‐aloneor
multi‐dropoperation.


iii.CommunicationProtocols

TheMS2701E transmitteroffersuser‐selectableRTUorASCIIcommunicationprotocols,givingtheunit
abroaderrangeofcompatibility.ThecommunicationprotocolissetusingPosition8ofSwitch2,as
illustratedinTable3.

iv.TerminationResistor

Toensureproperoperation,theRS‐485networkmustbeterminatedproperlywithatermination
resistor.Tofacilitatethis,eachMS2701E transmitterhasabuilt‐in120terminationresistorthatcan
beswitchedonoroffusingPosition10ofSwitch2.Onceallunitshavebeeninstalled,besureto
enabletheterminationresistorofthelastunitinthenetwork.Theterminationresistorsofallother
transmittersshouldbeturnedoff.
v.DataRegisters

Table5liststhedataregistersoftheMS2701E transmitter.

NoRegisterAddressDescription
140001DeviceStatus
240002DeviceAddress
340003BaudRate
440024DACValue
540026ProbeSwitchSetting

Table5.ModbusDataRegisters

12

c.CalibrationandTesting

i.Calibration

TheMS2701E transmitterisfullycalibratedwhenshippedfromthefactory.Thecalibrationsettings
arefixedtoavoidaccidentalchangewhichcouldresultinerroneousdata.Nofieldcalibrationis
required.However,itisimportanttotesttheunituponinstallation,andduringperiodicmaintenance
inspections,toensuretheunitisoperatingproperly.

ii.Testingoutputzeroandspan

TheMS2701E transmitterProbeSelectionSwitches(page9)offerthreetestsettingsthatallowthe
unittobeplacedintovariousdiagnosticmodesasfollows:

1) ZeroOutput–Forcesadigitaloutputof0.
2) MaximumOutput–Forcesadigitaloutputof65535.
3) FullScaleSweep–Causestheoutputtocontinuallycyclefrom0upto65535.

Thesetestmodescanbeusefulwhentroubleshootingcommunicationproblemsbetweenthe
transmitterandtheDCS/PLCsystem.

iii.TestingtheMS2701EtransmitterwiththeMeterProver

AMeterProverisprovidedtoallowroutinechecksoftheMS2701E transmitter.TheMeterProver
simulatesaWireLooptypeprobeatafixedvalue.TotesttheunitwiththeMeterProver:

1) Disconnectpower.
2) DisconnecttheMS2701E transmitterfromtheprobe(oriftheunitisremote‐mounted,
disconnecttheprobeextensioncablefromtheprobe.)
3) ConnecttheMeterProvertotheprobeconnectorstem(ortotheprobeextensioncableifthe
MS2701E transmitterisremote‐mounted.)
4) LoosentheEnclosureLockScrew.
5) Unthreadandremovethetransmittercover.
6) ChangetheProbeSelectionSwitchestotheWireLoopposition(seepage9.)
7) Reconnectpowerandallowtheinstrumenttomeasureforseveralminutestostabilize.
8) Afterseveralminutesobservethetransmitteroutput.Theoutputshouldcloselymatchthe
valueprintedontheMeterProverlabel.

IfthetransmitteroutputmatchestheMeterProvervalue,youmayreturntheProbeSelection
SwitchestotheirprevioussettingandreconnecttheMS2701E transmittertotheprobe.Ifthe
transmitteroutputshowsasignificantdifferencecomparedtotheMeterProvervalue,further
troubleshootingmayberequired.Refertopage16fortroubleshootingorcontactthefactoryfor
furtherassistance.

BesuretoreinstalltheenclosurecoverandtightentheLockScrewwhenputtingtheMS2701E
transmitterbackintoservice.



13

d.InterpretingData
i.MetalLoss
TheMS2701E transmittermeasurestheMetalLossofanERprobeandconvertsthatvaluetoadigital
16‐bitRS‐485Modbusoutput.ThisoutputisdirectlyproportionaltothecumulativeMetalLossofthe
ERprobeatanygiventime.Theoverallspanoftheoutputisproportionaltothelifeoftheprobein
use,soforDCS/PLCprogrammingtheRS‐485Modbusoutputcanbescaledasfollows:

0=0mils(0%MetalLoss)
65535=ProbeLifeinmils(100%MetalLoss)

TheProbeLifecanbefoundinTable1andisalsolistedontheMetalSamplesprobetag(asthe
“Multiplier”.)



Figure7.MetalSamplesProbeTag
Figure8illustratestherelationshipbetweenthedigitaloutputandMetalLoss.Inthisexamplea
probewitha10‐millifeisassumed.However,theXaxiscouldbechangedtorepresentanyProbeLife.
Figure8.OutputRelationship
Asseenhere,thetransmitteroutputbeginsat0foranewprobe(zeroMetalLoss)andincreasesas
theprobeelementcorrodes,eventuallyreachingamaximumof65535whentheprobesensing
elementhasbeencompletelyconsumedbycorrosion(inthiscase,10milsofMetalLoss.)Atthistime
theprobehasreacheditsend‐of‐lifeandmustbereplaced.


0
16384
32768
49151
65535
0.0 2.5 5.0 7.5 10.0
RS‐485ModbusOutput
MetalLoss(mils)
New
Probe
Probe
Consumed

14

ii.CalculatingCorrosionRate


Asexplainedpreviously,ERprobesandinstrumentsreportMetalLoss.However,thevaluethatisof
ultimateinterestisCorrosionRate.TheCorrosionRateisessentiallyMetalLossovertime,sothe
CorrosionRatecanbecalculatedusingthefollowingformula:
CorrosionRate󰇛mpy󰇜  ∆MetalLoss󰇛mils󰇜
∆Time󰇛days󰇜  365

where:
∆MetalLoss(mils)isthedifferencebetweentwoMetalLossreadings

 Time(days)isthetimedifferencebetweenthosetworeadings

Itisacommonpracticetoprogramthisformulaintothecontrol(DCS/PLC)systemandhaveit
calculateCorrosionRateonacontinualbasisfromtheMetalLossdata.Thechallengeindoingthisis
selectinganappropriatetimeinterval.Usinganintervalthatistooshortmaygiveerraticresults,
whileselectinganintervalthatistoolongmaygiveresultsthatareinsensitivetosystemupsets.The
idealtimeperioddependsonmanyfactors,andwillvaryfromsystemtosystem.Itmaytakesome
trialanderrortosettleonthebesttimeperiodforyourinstallation.

InsomecasesitmaybenecessarytoreviewtherawMetalLossdataandmanuallyapplythe
CorrosionRateformulatoperiodsofinterest.Forexample,lookatthegraphbelowandseehow
muchthecalculatedCorrosionRatecanvarydependingonthetimeperiodused.

Figure9.CorrosionRatescalculatedfromMetalLossdata
Whileeachoftheresultsisvalidfortheselectedtimeperiod,theoneofmostinterestisthevalueof
11.81mpywhichrepresentssometypeofsystemupset.WhentheCorrosionRateiscalculated
automaticallyonapre‐selectedtimeperiod,thereisnoguaranteethattheselectedtimeperiodwill
alwayscoincidewithsystemupsetssuchasthis.Thatiswhymanualreviewandinterpretationof
MetalLossdataisalsohelpful.

15

e.Commissioning

OncetheMS2701E transmitterhasbeeninstalled,tested,andproperlyconfiguredfortheprobeinuse,it
canthenbeclosedandputintoservice.First,performonelastvisualinspectiontoensurethatall
electricalconnectionsaresecureandthattheenclosureo‐ringisinplaceandisingoodcondition.Then
threadtheenclosurelidontothebasefully.Oncethelidhasbeenthreadedintoplace,tightentheLock
Screwtopreventunauthorizedtampering.



Figure10.EnclosureLockScrew

CAUTION:TheLockScrewontheinstrumentbasemustbetightenedsecurelytopreventunauthorized
personnelfromopeningtheMS2701E
transmitter,andensurethattheintrinsicsafetyisnotviolated.Only
qualifiedpersonnelshouldbeallowedtoinstall,operate,andmaintenancetheMS2701E
transmitter.

C.Maintenance
Onceinstalled,theMS2701E transmitterrequireslittlemaintenance.However,itisimportanttoverifythe
followingitemsperiodicallytoensurecontinuedsafeoperation.

CAUTION:BeforeperforminganytestsormaintenanceontheMS2701E
transmitter,ensurethatall
hazardousarearequirementsaremet.


InspectionItemFrequency
Inspecttheenclosureo‐ringforanysignsofdamage.Replaceasnecessary.Annually
Inspecttheprobeconnectoro‐ringforanysignsofdamage.Replaceasnecessary.Annually
Inspectallelectricalconnectionsforsignsofcorrosion,mechanicaldamage,orforeign
matterthatcouldcauseimproperoperationorcauseanelectricalshort.Cleanasnecessary.
Annually
Ensurethatthelockingscrewisinplaceandissecure.Annually
Inspecttheenclosureforanysignsofcorrosionorpaintdamage.Annually
Checkforanysignsofmoistureingresswithintheenclosure.Annually

ContactMetalSamplesforreplacementpartsorifinstrumentrepairisnecessary.

16

D.Troubleshooting

IftheMS2701E transmitterdoesnotseemtoperformasexpected,checkthefollowingitems:


CAUTION:BeforeperforminganytestsormaintenanceontheMS2701E
transmitter,ensurethatall
hazardousarearequirementsaremet.


1. Ensurethattheprobeisoperationalandisnotcompletelycorroded.Thiscanbedoneintwoways.
a. TesttheprobewithaportableERmeterifavailable.
b. Testtheprobewithaportableresistanceorcontinuitymeterasfollows:
i. Connectonetestleadtopin‘A’oftheprobes6‐pinconnector.
ii. Measurecontinuitytoeachoftheotherpins.Thereshouldbecontinuity(low
resistance)toeachpin.
NOTE:Continuityoneachpindoesnotensurethattheprobeisgood.However,ifyou
findanopencircuitonanypinsthenitisalmostcertainthattheprobeisbadandshould
bereplaced.
2. EnsurethattheProbeSelectionSwitchesaresetcorrectlyfortheprobebeingused.Confirmthe
probetypeandrefertoTable2onpage9toverifytheappropriateswitchsettings.
3. Performavisualinspectionofthecircuitboardstolookforanysignsofmechanicalorelectrical
damage.
4. Ensurethatallelectricalcablesandwiringareingoodcondition.
5. Ensurethatallelectricalcontactsaresecureandfreeofcorrosion.
6. Ensurethatthereisadequatesupplyvoltageatthepowerconnector.
7. Verifythatthesupplyvoltagepolarityiscorrect.
8. Ifthereisinsufficientsupplyvoltageonthepowerconnector,checkthesafetybarrier(if
applicable)forablownfuseoranyotherfailure.
9. TesttheMS2701E transmitterusingthesuppliedMeterProver(seepage12.)

Thesebasicchecksshouldindicatethesourceofanyproblem(probe,powersupply,wiring,etc.).Ifitis
determinedthattheMS2701E transmitterismalfunctioning,orifyouneedfurtherassistancein
troubleshooting,contactMetalSamplesTechnicalSupport.


CAUTION:IftheMS2701E transmittershowsanysignsofdamage,removeitfromserviceimmediatelyand
consultthefactory.






17

III.ServiceandWarrantyInformation

A.Warranty

MetalSampleswarrantsthatanypartofthemodelMS2701E transmitterandaccessorieswhichprovesto
bedefectiveinmaterialorworkmanshipwithinoneyearofthedateoforiginalshipmenttoPurchaserwill
berepairedorreplaced,atMetalSamplesoption,freeofcharge.Thiswarrantydoesnotcover(1)probe
assemblies,(2)itemsexpendableinnature,or(3)itemssubjecttodamagefromnormalwear,misuseor
abuse,orfailuretofollowuseandcareinstructions.

AlldamageditemsaretobeshippedatPurchaser’sexpensetoandfromMetalSampleswhichshallhave
therighttofinaldeterminationastotheexistenceandcauseofadefect.

TheforegoingshallconstitutethesoleandexclusiveremedyofanypurchaserofMetalSamplesproducts
forbreachofwarrantyandISEXCLUSIVEANDINLIEUOFALLOTHERWARRANTIES,EXPRESSED,IMPLIED
ORSTATUTORY,INCLUDINGTHEIMPLIEDWARRANTIESORMERCHANTABILITYANDFITNESS.INNOEVENT
SHALLMETALSAMPLESBELIABLEFORSPECIALORCONSEQUENTIALDAMAGES,ORFORANYDELAYIN
THEPERFORMANCEOFTHISWARRANTYDUETOCAUSESBEYONDITSCONTROL.

Thetechnicalinformationandsuggestionscontainedhereinarebelievedtobereliable,buttheyarenotto
beconstruedaswarrantiessinceconditionsofusearebeyondourcontrol.

B.ObtainingServiceandReturningtheInstrumentforRepair


Ifyouexperienceproblemswithyourinstrumentpleasecontactthefactoryat256‐358‐4202andaskfor
customersupportforinstrumentation.Ourcustomersupportdepartmentwillassistyouin
troubleshootingyourinstrument.

Mostissuescanberesolvedoverthephone,butinsomecasesitmaybenecessarytoreturnyour
instrumentforfurtherevaluationandrepair.Inthiscase,pleaseobtainaReturnMaterialsAuthorization
(RMA)numberfromthesalespersonorsupporttechnician.ThisRMAnumberwillensurethatyour
instrumentisroutedtothecorrectdepartmentwhenitisreceivedatthefactory.

AfterreceiptofanRMAnumberyoumaypackyourinstrumentforreturn.Besuretopackyour
instrumentinasturdyboxandtopaditsufficientlytoavoiddamageduringtransit.Alsobesureto
completethe“InstrumentRepairForm”onthenextpageandincludeacopywithyourrepair.Thiswill
ensurethattherepairdepartmenthassufficientinformationregardingtheproblemsyouareexperiencing
withyourinstrument,aswellasthebilling,contact,andreturnshippingdetailsfortherepair.

OnceyouhaveobtainedanRMAnumber,completedthe“InstrumentRepairForm”,andpackedyour
instrumentsecurely,pleaseshipitprepaidtothefollowingaddress:

MetalSamples
152MetalSamplesRoad
Munford,AL36268
ATTN:RMA#_____

NOTE:BesuretolistyourRMAnumberintheattentionline(shownasblanksintheexampleabove.)


18

C.InstrumentRepairForm

ThisformmaybephotocopiedforusewhenreturninganinstrumenttoMetalSamplesforrepair.
Pleasefillinallknowninformationandencloseacopyofthecompletedformwiththeinstrument.

GeneralInformation

Model
Number
Serial
Number

RMA
Number
Dateo
f
Purchase*
*Ifknown.

ContactInformationforRepair

Contact
Name

Company

Phone
Number
E‐mail
Address

ReturnShippingInformation

Recipient
Name*

Company*

Return
Address








*Ifdifferentthanabove.

ReasonforReturn.(Provideasmuchdetailaspossible.Attachadditionalpagesifrequired.)











InvoiceInstructions(Fornon‐warrantyrepairs)

Invoicemefortherepair
(RequiresanopenaccountwithMetalsamples.)
Reference
PO#



Contactmeforcreditcardinformation
(Forsecuritypurposes,donotlistcreditcardinformationonthisform..)
