Midwest 140 Manual de usuario



Mid-West

Instrument

Electrical Installation and O

eratin

Instructions - Model 140

Bulletin No: Elec IM140/18A

Supersedes Elec IM 140/16B

6500dobrydrsterlingheights,mi48314

1.0 Safety

Beforeinstalling,checktheModelNumberandverifycompatibilitytotheprocessmediaand

temperatureincontactwiththewettedparts.Incompatiblemediaand/oroperationat

temperatureextremescancauseprematuredegradationofmaterialswhichcouldresultinsafety

risktopersonnel.

Verifytheselectedpressurerange(differentialpressureandworkingpressure)andtheswitch

ratingsarewithinspecificationforyourapplication.

Warning!Performallelectricaladjustmentswithpowerremoved.

TheModel140productutilizesadiaphragmdesignwhichisolatesthehighprocessfromthelow

process.Foroverpressureconditions(HighoverLowandLowoverHigh)thediaphragmis

supportedattheendoftravelfortheratedworkingpressureofthegauge.However,itis

recommendedthatiflargepressurespikesexist,somesortofpressurelimitingdeviceshouldbe

installedforprotection.

Warning!Remainingmediamayresultinarisktopersonnel,environmentetc.Usesufficient

precautionarymeasureswhenremovingandtransportingtheproduct.

Warning!Ifinstallingproductwithinanotherenclosurethatispressuretight,pleaseverifyall

processconnectionareleaktight.Leakagewithinapressuretight(ieNEMA4X)enclosurecould

causeapressurebuildupwithintheenclosureandcauseaburstscenario.

1.1 Intendeduse



Theindicating/non‐indicatingdifferentialpressureswitchesortransmitterareusedformonitoring

differentialpressuresinindustrialapplications.

Themanufacturershallnotbeliableforanyclaimsiftheproductisusedinapplicationscontrarytothe

intendeduse.

1.2 Personnel



Personnelinstallingandputtingthisinstrumentationintoserviceshallbesuitablytrainedandqualifiedin

accordancewithlocalcodes,practicesandregulations.

1.3 Labeling/Marking



ThefollowingElectricalConfigurationsbearthismarkandcomplywiththerelevantEuropeanDirectives

identifiedonthedeclarationofconformity:A,B,E,F,T,W

Thefollowingelectricalconfigurationsbear1orbothofthesethirdpartylistingagencymarksfor

productevaluatedtobothUSandCanadianStandards:E,F,W

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Instructions - Model 140

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2.0 GeneralSpecifications



Non‐electrical



Electrical

*Productoftheswitchingvoltageandcurrentshallnotexceedthepowerratingofthedevice.

**Exceptwhereotherwisenoted

ParameterLimits(Std)Limits

(HazardousLocations)

WorkingPressure(PSI)

3000(AL)*NonHaz‐Loc

1500(Br)NonHaz‐Loc 

3000(SS)*NonHaz‐Loc

1500(BrNonEnd)

3000(Al/SSNonEnd)

2000(AL/SSEndConn.)

1625(Al/SSNace)

ProofPressure4XRatedWorkingPressure

Temperature‐40°to200°F(Switches)

-20F to 150F (Transmitter)

DifferentialPressureRange

(PSID)0‐50”H2Oto0to100PSID

IndicatorAccuracy

ASMEB40.1002%

DPOver‐Range+/‐Proofpressure

SwitchSpecification

Parameter SPST (NO) SPDT

Option:BA

*Power25W3W

Max.Current0.5Amps0.25Amps

Max.Voltage

VAC/VDC240125

**Setting

(%F.S.)15to9515to95

Hysterisis

(Max/Nom)

15%/8%

(F.S.)

10%/5%

(F.S.)

Repeatability1%F.S.1%F.S.

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Instructions - Model 140

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Transmitter

3.0 ProductDescription:

Switch

Aflexibleelastomerdiaphragmandcalibratedrangespringaremovedbydifferentialpressure.A

magnet,coupledwiththediaphragm,transmitthismotionthroughthewallofthepressurehousingtoa

followermagnetattachedtoanindicatingpointer.Therotationofthefollowermagnetcausesthe

pointertotrackthemovementoftheinternalmagnetandindicatethedifferentialpressureonthedial

scale.Theswitchesarealsomagneticallyoperatedandarelocatedoutsideofthepressurehousing.The

switchesaremechanicallyadjustableallowingthecustomertosettheswitchwithinadefined

adjustmentspanoftherangeoftheinstrument.

Transmitter

TheModel140indicating/non‐indicatingdifferentialpressuretransmitterisa2wirelooppowered

microprocessorbased4‐20matransmitter.Themagneticanglesensor&electronicssensestheangle

(relativetothetransmittersensor)ofthemagnetwhichmoveslinearlyinthebore.Eachtransmitteris

individuallycalibratedtothegaugeusingan11pointcalibrationlinearizationtechnique.Thismethod

resultsina<2%fullscaleaccuracyfortheupper80%oftherange.



Transmitter Specifications: (Calibrated on Increasing pressure) Comments:

Operating Temperature (Max.) -20F - 150F

ELECTRICAL:

Min Typ Max

Transmitter Accuracy (FSR) 2% Upper 80% of Full Scale

Range

Supply Voltage (3) (Vdc) 8 28 Pin 3 Reverse Polarity

Protected

Output Current (ma)

Zero Floating (2) 4.0 – 20.1 ma 4.0 – 21.0 4.0 – 22.0 Pin 2

Zeroed (1 connected to 2) 8

oltage (Pin 2 to 1) 4.8 6.3

Zero Time (seconds) 2

Max Loop Resistance (ohms) 1000

Max Loop Resistance Formula ((Vs – 8)*1000)/ 20

INTERFACE:

Electrical:

Connections: 4 Position Terminal Strip; ½” NPT Conduit

1= Rtn, 2= Zero, 3 = 8-28 Vdc In 4= Chassis 22 Awg – 16Awg Wire

Environmental Rating: NEMA 4X

Certifications: CSA (Canadian & US Standards; Division 2 Locations)

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Instructions - Model 140

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4.0 Installation:

MechanicalConnections

¼”FNPTareprovidedstandard,howevercheckyourpaperworktoconfirmtheconnectionsordered.

Thereare2connectionsidentifiedonthegaugebodyas“Hi”and“Lo”forHighpressureandLow

pressurerespectively.Besuretheseareplumbedproperlyinyoursystem.Improperconnectionwillnot

damagetheinstrument,butitwillnotfunctionproperly.

Donotallowgaugefittingstorotatewhenmakingprocessconnections.Calibrationand/or

pressureratingoftheproductmaybecompromised.

Forendconnectedorgaugessuppliedwithadapterfittingsusetwowrencheswhenmakingconnections.

Useonewrenchtoholdthepressureportfittingonthegaugeandtheothertotightentheprocesspipe

oftubefitting.

InstrumentLocation:

Onliquidservicetheinstrumentshouldbemountedbelowtheprocessconnectionstofacilitateself‐

bleeding.Ongasserviceitshouldbelocatedabovetheprocessconnectionstopromoteself‐draining.If

theprocesscontainsparticulates,apigtailloopordropleg(manometer“U‐tube”configuration)inthe

tubingwillminimizethepossibilityofitmigratingintotheinstrument.

TemperatureLimitations:

Forprocesstemperatureshigherthantheratedtemperatureofthedpgauge/switch,useprocess

tubingtoreducethetemperature.Ageneral“ruleofthumb”isthatforhorizontaltubingrunsthetemp

dropis100°F/ft.Anotheroptionistouse“coolingtowers”toprotecttheinstrument.

Verifytheselectedelastomeroptionisappropriateforyouroperatingtemperature.

Wall/Pipe/PanelMounting:

Notallcombinationofoptionscanbewall,pipe,orpanelmounted.Ifyourunitissuppliedwithawallor

panelmountpossibleconfigurationsareshownbelow:

WallMountConfigurations:



WALLMOUNTBRACKET(NoSwitchShown)

0.09

[2.3mm]

1.00

[25.4mm]



2.00

[50.8mm]

Ø.205[5.2mm]

THRU

(4)HOLES



6.07

[154.2mm] 

6.70

[170.2mm]



6.08

[154.4mm]

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Instructions - Model 140

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PipeMounting

PipemountingbracketsarenotavailableforanyElectricalConfigurationsinthereverseport

configuration.



PanelMount

Gaugeswith2½”dialscanonlybemountedthroughtherearofthepanel.Maketheproperpanel

cutoutasshownbelow.Removethe(4)bezelscrewsandinsertthegaugefrontthroughtherearofthe

panel.Reinstallthebezelscrewsthroughthefrontofthepanelandintothegaugebezel.Tightenscrews

securelyinanalternatingdiagonalpattern.

Gaugeswith3½”dialsshouldbemountedfromthefrontofthepanel.Contactthefactoryformounting

anddimensionalinformation.

Gaugeswith4½”dialsshouldbemountedfromthefrontofthepanel.Makethecutoutasindicted

below.Insertthe(4)panelstuds,fingertight,intothemetalinsertslocatedintherearofthebezel.

Insertthegaugethroughthepanel,aligningthepanelmountingstudswiththeholesinthepanel.Install

the(4)8‐32nutsontothestudsandtightensecurely.



6.22

5.24

2.81

3.80

2.81

.70

.15

1.16

Typical2”PipeMounting

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Instructions - Model 140

6500dobrydrsterlingheights,mi48314Page6

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45°

Ø3.00(76.2)

Ø3.50(88.9)

Ø0.19(4.7)

(4HOLES)

Typical2½”PanelMount

3.30

3.39

.56

5.30

1.10

Ø5.30(134.6)

Ø5.63 (143.0)

Ø0.19 (4.7)

(4 HOLES)

BOLT CIRCLE

Typical4½”PanelMount

6 in. DIAL PANEL CUT-OUT

MODEL 140

BOLT CIRCLE

Ø0.19 (4.7)

(4 HOLES)

Ø6.50 (165.1)

Ø7.00 (177.8)

#8‐32SCREW

(4PLACES)

PANEL

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Instructions - Model 140

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5.0 Electrical:

Warning:Electricalconnectionsshouldbeperformedbyqualifiedpersonnelandmeetthe

representativecountry'snationalelectricalcode.

Warning:Failuretoconnecttotheprotectiveconductorterminalmayresultinashockhazard.

Warning:Performallswitchadjustmentswithpowerremoved.Useanohmmeterorequivalentto

monitorcontactoperation.

Caution: Preferenceshouldbegiventosettingtheswitchpriortoinstallation.Itisalsorecommended

toperformadjustmentsusinganon‐magneticPhilipsscrewdriver.

General

Allswitchtypesarefieldadjustable.Thedefinedrangeoftheadjustmentisspecifiedinthetableabove.All

switchescomewithadecaltoidentifyadjustmentdirectiontoincreasethesetpoint.

SwitchSetPointAdjustment

Caution:Donotconfusetheswitchadjustaccessastheswitchadjustscrew.

Note:Switchescanbesetbelowthedefinedminimumsetpointhowever,theswitchmaynotremain

activatedatmaximumPSID.Iftheunitissetbelowthedefinedminimumsetpoint,thecustomershould

verifythattheswitchremainsactivatedfromthesetpointto

overrangeofthegauge.

Theswitchmaybesetusingtheindicatingdialasa

reference(unitswithadial)orbyusingareferencepressure

gauge.

Forsettingonincreasingpressureincreaseyourpressureto

thedesiredsetpoint.Increasetheswitchsetpointabove

thedesiredswitchset(switchdeactivated).Slowlydecrease

theswitchsetpointuntilthecontactactivates.

ContactProtection:

Providestandardprotectiontechniquesfortheswitchcontactsforcapacitiveandinductiveloads.Use

currentlimitingtechniquesneartheswitchtoprotectthecontactsduetohighinrush(i.e.;inlineresistoror

inductor)forlongcableinterfaces.Provideclampingdevicesatornearinductiveloads(i.e.;relay).

Maximumwirelengthbetweenthe3Wswitchanditsloadshouldnotexceed70–100Feet

for120VACapplications.WerecommendthatyouusetheSPSTswitchoruseacurrent

limitingresistorwiredinseriesandlocatedneartheswitch.Contactthefactoryforassistance

regardingthiscondition.(ForhazardousLocationstheresistoroptionisnotallowed)

Connections:

Warning:Whenwiringtotheterminalstrip,makesureallwirestrandsarecontainedwithin

theterminalconnection.

SwitchAdjust

Access

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

Thereedswitch(es)arelocatedinsidetheenclosure,onthetopofthepressurehousing(standardport),and

areconnectedtoa7positionterminalstrip.Anopeningisprovidedattherearoftheenclosurefora1/2"

flexibleweather‐proofcableorconduitconnector(suppliedbycustomer)(A&BElectricalConfiguration)ora

½”FNPTconduitinterface(E&FElectricalConfiguration).Uponrequesttheholemaybesizedto

accommodateaPG‐11cableglandconnector.

Toaccesstheterminalstripremovetheswitchenclosurecoverbyremovingthe(4)screws.Insertwires

throughanappropriate(notsupplied)weatherproofconnectorintotheenclosureandconnecttothe

terminalstrippertheterminalstripdiagramshownbeloworontheundersideoftheswitchenclosurecover.

Thecenterconnectionisforconnectionofaprotectiveconductorandisconnectedtothebodyofthe

pressuregauge.

Theterminalstripwillacceptwiresintherangeof22Awg‐16Awg..

Reinstallthecover,gasket,and(4)screws.(Fig.3)afterconnectionof

fieldwiring.

WiringfortheSPSTswitchesisconnectedbetweenNOandCM

connectionsontheterminalstrip.Normallyclosedswitchesare

generallynotavailable.Pre‐setswitcheswillhavetheirsetpoints

identifiedonthelabel.



ElectricalConfigurationsA,B,E,F

ElectricalconfigurationsA,B,E,&Fcan

beusedinPollutiondegree3IndustrialtypeareasTheseconfigurationsareratedNEMA4XIP65.

TheenclosureforConfigurationA&Bisamoldedplastic,whereastheenclosureforconfiguration’sE&Fare

madefromAluminum.

Note:ConfigurationA,&B,hasanelectricalaccesshole(.875).ConfigurationsE&Fhasa1/2”FNPT

conduitinterface.ThesafetyevaluationandtheNEMAratingsfortheseconfigurationswasperformed

withthisaccesssealed.

Areverseportgaugehastheswitchhousinglocatedonthebottomofthegaugebody

ElectricalConfigurationsE&F:

TheE&FElectricalConfigurationare3RDpartycertifiedforClassI,DivisionII,GroupsA,B,C,&D,ClassII,

GroupsF&Ghazardousenvironments.TheCSAmarkidentifiestheproducthasbeentestedtothe

applicableUSstandardsandCanadianstandards.

Warning!Pleasenotethepressureratingsonthe

HazardousLocationsTag.Maxworkingpressures

arereducedforHazardousLocationsto1375PSID

forallmaterials



ElectricalConfigurationsTorW:(TransmitterOption)

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Intendeduse:

TheModel142TransmitterisintendedforuseinGeneralPurposeLocations(Telectricalconfiguration)or

Division2hazardouslocations(Welectricalconfiguration).InbothcasestheenclosurecarriesaNEMA4X

IP65environmentalrating.

Description:

ThetransmitterassemblyifCEmarkedisalsocompliantwithEMCDirective2004/108/EC.Thetransmitter

hasafactoryprogrammedlow‐passfilter.Thefilterissettoapproximately1second.Thiscanbeincreased

ordecreaseduponcustomerrequestatthetimeoforder.

Note:Thetransmittercircuitrysensesthepositionofamagnet.Anymagneticobjectlocatednearthegauge

mayaffecttransmitteraccuracy.

Thetransmitterifnecessarycanbezeroedbyjumperingpin2toGndpin1momentarilyfor2seconds(with

theunitpowered).Inmostcasesthiswillneverbenecessaryasthetransmitterisprogrammedtogeneratea

4maoutputforthefirst4%oftheFSR.

Warning: IfzeroingintheHazardousLocationenvironmentuseaswitchapprovedforthatlocation.

Caution: Donotzerothetransmitterwithpressureapplied.Otherwiseyourproductwillhavea

negativeoffsetequivalenttothepressurewhenthezerowasactivated.

Caution:Donotattempttorepositionthetransmitterassemblywithintheenclosure.Thisvoidsthe

warrantyandwill“knock”theunitoutofcalibration.Disassemblyandre‐assemblyofany

internalprocesspartswillalsorequiretheunittobere‐calibrated.Calibrationmustbe

performedatthefactory.

Connections:

Theweather‐proofenclosurecomesstandardwitha½”FNPTconduitinterface.Theinternal4position

terminalstripacceptswiresizes22AWG–16AWG.

Toaccessthe4positionterminalstrip,removethe4coverscrewsfromtheenclosure.Connectlooppower

betweentheconnectionslabeled8‐28VdcandReturn(seeFigurebelow).Connecttheprotectiveconductor

wiretotheterminalidentifiedwiththesymbol.SeetheInterfaceschematicbelow.Pleasenotethatthe

looppowersensingdevicecanalsobelocatedinthegroundleg.



RLoo

To Transmitter

8-28 Vdc Pin 3

To Transmitter

GND Pin 1

Interface Schematic

8-28Vdc To Transmitter

Zero Pin 2

4-20 ma

DP Transmitter

Customer Interface

1 Optional remote zero (customer supplied)

2 Loop Resistor can be located in the ground leg

Zero

Return

8-28

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

Warning:Whenwiringtotheterminalstrip,makesureallwirestrandsarecontainedwithin

theterminalconnection.

Themaximumloopresistanceis1000ohms(@28VdcInput).Usethefollowingformulatodeterminethe

maximumloopresistanceatotherinputvoltages:((Vs–8)*1000)/20)

ElectricalConfigurationW:(Transmitter)

TheWElectricalConfigurationis3RDpartycertifiedforClassI,DivisionII,GroupsA,B,C,&D,ClassII,

GroupsF&Ghazardousenvironments.TheCSAmarkidentifiestheproducthasbeentestedtothe

applicableUSstandardsandCanadianstandards.



Warning:PleasenotethepressureratingsontheHazardous

LocationsTag.Maxworkingpressuresarereducedfor

HazardousLocationsto1375PSIDforallmaterials



6.0 Dimensions



ElectricalConfiguration:TorW

Model140/141EndConnected

WithTransmitter2½”Dial

ElectricalConfiguration:TorW

Model140/141EndConnected

WithTransmitter4½”Dial

Woption=ClassI,Div.2,GroupsA,B,C,D

ClassII,Div2,GroupsF& G

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