仪表安装技术要求(英文)

TECHNICALSPECIFICATIONSFORAUTOMATIONINSTRUMENTINSTALLATIONWORKS

Technicalrequirementsforconstruction

1.1 ConditionsforInstrumentInstallation

1.1.1 Theconstructiondrawings,relatedtechnicaldocumentsandnecessaryinstallationandoperationinstructionsoftheinstrumentsareallreadyandonhand.

1.1.2 Jointcheckupofconstructiondrawingshasbeenmade.

2.1.3 Technicalpreparationsuchastechnicalexplanationandtraininghasbeencompleted.

2.1.4 Theconstructionsitehasbeenmadereadyforinstrumentationworks,andconstructionprocedureshavebeenpreparedandapproved.

2.2GeneralSpecificationofInstrumentInstallation

2.2.1 Theinstrumentinstallationworksmustbecompliedwiththeconstructiondrawingsandtheoperationinstructionsoftheinstruments.Themodel,specificationandqualityoftheequipmentandmaterialmustbecompliedwiththeInstrumentSpecifications.

2.2.2 Goodcooperationmustbemadebetweentheinstrumentconstructionworksandotherspecialties,suchasbuilding,structure,electric,processequipment,pipingandsoon.

2.2.3 Amongtheinstrumentinstallationworks,theinstallationofpowersupplyequipment,layingofelectriclinesandconstructionofelectricexplosion-proofingandgroundingworksmustbecompliedwiththeCodeforConstructionandAcceptanceofIndustrialAutomationandInstrumentationEngineering(GBJ93-86)andStandardforQualityInspectionandAssessmentofAutomationInstrumentInstallationWorks(GBJ131-90).

2.2.4TheweldingoftheinstrumentinstallationworksmustbecompliedwithCM-QC-TR-009CodefortheFieldWeldingofEquipmentandIndustrialPiping.

2.2.5 Thepurgingoftheairsupplysystem,cleaningofliquidsupplysystem,cuttingmethodofthepipeline,andprocessingofhigh-pressurescrewthreadandsealingsurfaceforthreadedflangeconnectionaswellasconnectionofpipingmustbecompliedwiththespecificationintheCodeforConstructionandAcceptanceofIndustrialMetallicPiping.

2.3InstallationofSensingElements

2.3.1 GeneralSpecification

(1) Theinstallationofsensingelementsshallbemadeatthesametimeastheprocessequipmentmanufacturingorprefabricationandinstallationofprocesspiping.

(2) Openingandweldingforsensingelementinstallationmustbedonebeforetheanti-corrosion,lining,purgingandpressuretestofprocesspipingorequipment.

(3) Holes/Openingsinthehighpressure,alloysteelandnon-ferrousmetalprocesspipingandequipmentmustbeboredwithmechanicalmethod.

(4) Thesensingelementstobeinstalledonmasonryorconcretecastpiecemustbeembeddedatthesametimewhenthemasonryorcastingisbeingmade.Ifitcannotbedoneso,themountingholesshallbereserved.

(5) Openingandweldingforinstallationofthesensingelementsisnotpreferredatornearweldingseams.

(6) Thesensingelementsusedinhighpressure,negativepressure,hightemperature,flammable,explosive,poisonousandnoxiousmediamustbeallinspected.

(7) Thesensingelementsusedininnoxiousmediaatnormaltemperatureunderlowandmediumpressuremusthavespotinspectionatrateof30%accordingtosortoftheelementsandonepieceofeachsortshallbeinspectedasminimum.

2.3.2TemperatureSensingElement

ThetechnicalrequirementsforconstructionofthetemperaturesensingelementsshallbecompliedwiththeTable1.

Table1

Item

TechnicalRequirements

Material

Conformedtothedesignrequirements

Location

Farawayfromstrongmagneticfield,vibrationandavoidingfluiddeadangle

Verticalinstallation

Axesofpipingandelementareperpendicularlycrossed.

Installationatthebendofpiping

Axesofpipingandelementarecoincident.

Inclinedinstallation

Countercurrenttomediumflow

Installationwithexpandedtube

ConformedtoSection2.2.4ofGBJ93-86

Tightness

Noleakage

Pressureresistance

ConformedtoSection8.6ofGBJ93-86

2.3.3PressureSensingElement

ThetechnicalrequirementsforpressuresensingelementconstructionshallbecompliedwithTable2.

Table2

Item

TechnicalRequirements

Material

Conformedtodesignrequirements

Location

Conformedtodesignrequirements

Installationorientationonhorizontalandinclinedpiping

Gasmedium

Abovehorizontalcenterlineofthepiping

Liquidmedium

Within45°corneranglebelowhorizontalcenterlineofthepiping

Steammedium

Within45°cornerangleaboveorbelowhorizontalcenterlineofthepiping

Installedonpipingofturbidmediacontainingdustorsediments

Vertical

Inclinedupward

Horizontal

Tobeanacuteanglealongtheflowdirectionofthemediumattheuppersegmentofthepipeline

Adjacenttotemperaturesensingelementhole

Attheupperstreamofthetemperaturesensingelementhole

Sensingelementstubextendingintothepipingorequipmentinnerwall

Shallnotexceedtheinnerwall

Tightness

Noleakage

Pressureresistance

ConformedtoSection8.6ofGBJ93-86

2.3.4FlowSensingElement

ThetechnicalrequirementsfortheflowsensingelementconstructionshallbecompliedwiththeTable3.

Table3

Item

TechnicalRequirements

Check-upbeforeInstallationoftheThrottlingElements

Material,modelandspecification

Conformedtothedesignrequirements

Appearance

Cleanandsmooth

Orientationoforificeplateandcarriertap

Inlinewith“＋”and“－”

Innerringofcarrier(D1)

D≤D1≤1.02D

Deviationoforificediameter

Conformedtothedesignrequirements

Edgeoforificeplateinletandnozzleoutlet

Noburrandroundangle

InstallationofFlowSensingElements

Material,modelandspecification

Conformedtothedesignrequirements

Min.lengthofthestraightrunbeforeandafterthethrottlingelement

ConformedtothedesignrequirementsandISO-5167Standard

Distancefromthethermometerinstalledattheupperstreamtothrottlingelement

Thermowelldiameterofthethermometer≤0.03D

L≥5D

Thermowelldiameterofthethermometerbetween0.03Dand0.13D

L≥20D

Distance(L1)fromthethermometerinstalledatthedownstreamtothrottlingelement

L1≥5D

Item

TechnicalRequirements

InstallationofFlowSensingElements

Installationoftheflangeusedtoclampthethrottlingelement

Weldingofflangewiththepiping

Thenozzleshallbeflushwiththeflangeface.

Perpendicularityoftheflangefacetopipingaxis

Allowablevariation1°

Coaxialitybetweenflangeandthepiping

T0.015D(1/B-1)

Insidediameterofthebuttweldedflanges

D2＝D

Orientationofsensingelementonhorizontalandinclinedpiping

Gasmedium

Abovethehorizontalcenterlineofthepipeline

Liquidmedium

Within45°corneranglebelowthehorizontalcenterlineofthepipeline

Steammedium

Within45°cornerangleabovethehorizontalcenterlineofthepipeline

Flangeused

assensingelement

Distancebetweentheaxesoftheupperanddownstreamsensingholesandtheupperanddownstreamsideendfaceoftheorificeplate(L3)

L3＝25.4±0.8mm

Diametersoftheupperanddownstreamsensingholes

Equal

Theaxisofsensingholeandtheprocesspipingaxis

Crossedperpendicularly

2.3.5LevelMeasurementElement

ThetechnicalrequirementsfortheconstructionofthelevelsensingelementsshallbecompliedwiththefollowingTable4.

Table4

Item

TechnicalRequirements

Material

Conformedtothedesignrequirements

Location

Conformedtothedesignrequirements

Guidingdeviceofthefloatlevelgauge

Verticalandtheliquidflowintheguidingdeviceshallbeunblocked.

Two-chamberbalancecontainer

Positionofthecontainer

Vertical

Centerpoint

Coincidedwithnormalliquidlevelandtheallowabledeviationbeing2mm

Sing-chamberbalancecontainer

Positionofthecontainer

Vertical

Elevation

Conformedtothedesignrequirements

Compensationtypebalancecontainer

Providedwithheatexpansionpreventiondevice

Connectingpipebetweentheflangeofthefixedfloatlevelgaugeandtheprocessequipment

Assuringthefloattomovefreelywithinfullrange

Tightness

Noleakage

Pressureresistance

ConformedtoSection8.6ofGBJ93-86

2.3.6CompositionSensingElement

ThetechnicalrequirementsfortheconstructionofthecompositionsensingelementsshallbecompliedwiththefollowingTable5.

Table5

Item

TechnicalRequirements

Material

Conformedtothedesignrequirements

Location

Conformedtothedesignrequirements

Orientationofinstallationonhorizontalandinclinedpiping

Gasmedium

Abovethehorizontalcenterlineofthepipeline

Liquidmedium

Within45°corneranglebelowthehorizontalcenterlineofthepipeline

Steammedium

Within45°cornerangleaboveandbelowthehorizontalcenterlineofthepipeline

Elevationangle(θ)ofthesensingelementforgascontainingsolidorliquidimpurity

θ＞15°

Tightness

Noleakage

Pressureresistance

ConformedtoSection8.6ofGBJ93-86

2.4InstrumentPanelsandOperatingConsoles

2.4.1 FormedSteelBaseoftheInstrumentPanelandOperatingConsole

ThetechnicalrequirementsfortheconstructionoftheformedsteelbasesoftheinstrumentpanelsandoperatingconsolesshallbecompliedwiththeTable6.

Table6

Item

TechnicalRequirements

Fabrication

Material,modelandspecification

Conformedtothedesignrequirements

Outlinedimensions

Inlinewiththepanelandoperatingconsole

Linearity

Permeter

Allowabledeviation1mm

Totallengthbeingmorethan5m

Allowabledeviation5mm

Installation

Position

Conformedtothedesignrequirements

Uppersurfaceofthebase

Horizontalandhigherabovetheground

Horizontalobliquity

Permeter

Allowabledeviation1mm

Totallengthbeingmorethan5m

Allowabledeviation5mm

Installation

Fixation

Firm

Painting

Intact

Grounding

Conformedtothedesignrequirements

2.4.2InstrumentPanelandOperatingConsole

ThetechnicalrequirementsfortheconstructionoftheinstrumentpanelsandoperatingconsolesshallbecompliedwiththeTable7.

Table7

Items

TechnicalRequirements

Installation

Verticality(permeter)

Allowabledeviation1.5mm

Topelevationdifferencebetweentwoadjacentpanels(consoles)

Allowabledeviation2mm

Maximumtopelevationdifferencebetweenthepanels(thejointsbetweenthepanelsbeingmorethantwo)

Allowabledeviation5mm

Flatnessofthepanels(consoles)

Atthejointseambetweentwoadjacentpanels(consoles)

Allowabledeviation1mm

Atjoints(morethan5)betweenpanels

Allowabledeviation5mm

Jointclearancebetweenpanels(consoles)

Allowabledeviation2mm

Fixation

Firm

Painting

Intact

Grounding

Conformedtothedesignrequirements

Bolt

Providedwithanti-rustlayer

Vibrationreduction

Conformedtothedesignrequirements

Sealing

Conformedtothedesignrequirements

2.5 Instruments

2.5.1 GeneralSpecification

2.5.1.1 Theinstrumentsusedinhighpressure,negativepressure,hightemperature,flammable,explosive,poisonousandnoxiousmediamustbeallinspected.

2.5.1.2Spotcheckmustbemadeatrateof30%fortheinstrumentsusedforinnoxiousmediumatlow-andmediumpressureandnormaltemperatureaccordingtotheirsystemandservices.Atleastonesystemoronepieceofequipmentforoneserviceshallbecheckedasmin.

2.5.2TemperatureInstruments

2.5.2.1TemperatureMeasuringElement

Thetechnicalrequirementsfortheconstructionofthetemperature-measuringelementsshallbecompliedwiththeTable8.

Table8

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Position

ConformedtothedesignrequirementsorSection4.1.1ofGBJ93-86

Protectivemeasures

ConformedtoSection4.2.1and4.1.2ofGBJ93-86

Materialofthegasket

Conformedtothedesignrequirements

Tightness

Noleakage

InsertionDepth

Inthepipeline

Conformedtothedesignrequirements

Intheequipment

Conformedtothedesignrequirements

Wiring

Correctandorderly

2.5.2.2TemperatureTransmitter

ThetechnicalrequirementsfortheconstructionofthetemperaturetransmittersshallbecompliedwiththeTable9.

Table9

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Position

ConformedtothedesignrequirementsorSection4.1.1ofGBJ93-86

Accessories

Complete

Fixation

Firmandright

Centralizedinstallation

Conformedtothedesignrequirements

Wiring

Modelandspecification

Conformedtothedesignrequirements

Connection

Correct

Connectionoftheterminal

Firmandhavinggoodconductivity

Lead-ininletoftheterminalbox

Shallnotfaceupwardandshallbesealed

Signofthelinenumber

Correctandclear

2.5.3PressureInstruments

2.5.3.1PressureGauge

ThetechnicalrequirementsfortheconstructionofthepressuregaugesshallbecompliedwiththeTable10.

Table10

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Position

Conformedtothedesignrequirements,convenientforoperationandmaintenance

Sensingjoint

Connection

Tomaketheinstrumentnottobearmechanicalstress

Tightness

Noleakage

Materialofthegasket

Conformedtothedesignrequirements

Fixation

Firmandright

Wiring

Correct

Installationheight

Forlowpressuremeasurement

Instrumentcentershallbe1.2to1.5mabovetheground.

Forhighpressuremeasurement

Instrumentcentershallbe1.8mabovetheground.

2.5.3.2PressureTransmitter

ThetechnicalrequirementsfortheconstructionofthepressuretransmittersshallbecompliedwiththeTable11.

Table11

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Position

ConformedtothedesignrequirementsorSection4.1.1ofGBJ93-86

Accessories

Allreadyandcomplete

Fixation

Firmandright

Sensingjoint

Connection

Tomaketheinstrumentnottobearmechanicalstress

Tightness

Noleakage

Centralizedinstallation

Conformedtothedesignrequirements

Installation

Pipingconnectionorwiring

Noleakageandcorrect

Connectionoftheterminalend

Firmandhavinggoodconductivity

Signofthelinenumber

Correctandclear

2.5.4FlowInstruments

2.5.4.1DifferentialPressureTransmitter

ThetechnicalrequirementsfortheconstructionofthedifferentialpressuretransmittersshallbecompliedwiththeTable12.

Table12

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Position

ConformedtothedesignrequirementsorSection4.1.1ofGBJ93-86

Accessories

Allreadyandcomplete

Fixation

Firmandright

Inclineddirectionandslopingofthepressure-leadingtube

Conformedtothedesignrequirements

Positive/negativepressurechamberandsensingjoint

Connectionposition

Correct

Connection

Tomaketheinstrumentnottobearmechanicalstress

Tightness

Noleakage

Isolatorandcondenser

Conformedtothedesignrequirements

Pipingconnectionorwiring

Noleakageandcorrect

2.5.4.2VortexFlowMeter

ThetechnicalrequirementsoftheconstructionofthevortexflowmetershallbecompliedwiththeTable13.

Table13

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Position

Conformedtothedesignrequirements

Lengthofstraightrun

Conformedtothedesignrequirements

Installationdirection

Conformedtothedesignrequirementsortheoperationmanual

Installationofthefilter

Conformedtothedesignrequirementsortheoperationmanual

Installationofthegasremovingunit

Conformedtothedesignrequirementsortheoperationmanual

Wiring

Modelandspecification

Conformedtothedesignrequirements

Connection

Correct

Connectionoftheterminal

Firmandhavinggoodconductivity

Signofthelinenumber

Correctandclear

2.5.4.3ElectromagneticFlowMeter

ThetechnicalrequirementsfortheconstructionoftheelectromagneticflowmetersshallbecompliedwiththeTable14.

Table14

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Position

Conformedtothedesignrequirements

Lining

Completeandintact

Fixation

Firm,flatandright.Tomaketheinstrumentnottobearmechanicalstress

Wiring

Modelandspecification

Conformedtothedesignrequirements

Connection

Correct

Connectionoftheterminal

Firmandhavinggoodconductivity

Installationonverticalpipeline

Tomakethefluidflowingupwardly

Installationonhorizontalorinclinedpipeline

Noneofthemeasuringelectrodesshallberightoverorunderthepipeline.

Grounding

Theliquid,connectingflange,caseoftheflowmetershallbeconnectedatthesamegroundpotential.

Signofthelinenumber

Correctandclear

2.5.5LevelInstruments

Thetechnicalrequirementsfortheconstructionofthefloattype(displacementtype,ballfloatorbuoy)levelgaugesshallbecompliedwiththeTable15.

Table15

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Installationheightofthefloat

Conformedtothedesignrequirements

Heightofthecenteroftheflange

Conformedtothedesignrequirements

Verticalityoftheguidingdeviceofthefloat

Theallowabledeviationpermetershallbe2mmandthetotallengthshallnotmorethan20m.

Movementofthefloat

Movingfreelywithoutblocking

Verticalityoftheoutsidefloatbowl

Allowabledeviationpremeter2mm

Pipingconnectionorwiring

Noleakage,correct

Tightness

Noleakage

Pressure-resistance

ConformedtoSection8.6ofGBJ93-86

2.5.6 AnalyzingInstrument

ThetechnicalrequirementsfortheconstructionoftheanalyzinginstrumentsshallbecompliedwiththeTable16.

Table16

Item

TechnicalRequirements

PretreatmentInstallation

Modelandspecification

Conformedtothedesignrequirements

Fixation

Firmandright

Pipingconnection

Noleakage,conformedtothedesignrequirements

Distancetotransmitter

Conformedtothedesignrequirements

Pretreatmentdevice

Mediumhavingdustorimpurities

Purificationdevicebeingcomplete

Hightemperaturemedium

Coolingdevicebeingcomplete

Highpressuremedium

Pressure-reducingandstabilizingdevicebeingcomplete

InstallationofAnalyzer

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Appearancecheck

Ingoodcondition

Accessories

Allreadyandcomplete

Fixation

Firmandright

Pipingconnection

Noleakage,conformedtothedesignrequirements

Wiring

Modelandspecification

Conformedtothedesignrequirements

Connection

Correct

Grounding

Conformedtothedesignrequirements

Lengthofthesignalline

Conformedtothedesignrequirements

Connectionoftheterminalend

Firmandhavinggoodconductivity

Signofthelinenumber

Correctandclear

Dischargepipe

Connectedwiththeheaderpipe,unblockedwithoutleakage,conformedtothedesignrequirements

2.6ControlValve,ActuatorandSolenoidValve

2.6.1 ThetechnicalrequirementsfortheconstructionofthecontrolvalvesshallbecompliedwiththeTable17.

Table17

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Accessories

Allreadyandcomplete

Fixation

Firmandright

Position

Conformedtothedesignrequirements

Directionoftheinlet/outlet

Correctandmarkedclearly

Airtubingconnectionorwiring

Noleakageandcorrect

Gasketoftheflange

Conformedtothedesignrequirements

Tightness

Noleakage

2.6.2Electric(Pneumatic)Actuator

Thetechnicalrequirementsfortheconstructionoftheelectric(pneumatic)actuatorsshallbecompliedwiththeTable18.

Table18

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Accessories

Allreadyandcomplete

Fixation

Firmandright

Airtubingconnectionorwiring

Noleakage,correct

Movementoftheterminalswitch

Freeandcorrect

Movementofthemechanicaldrivingmechanism

Free,smooth,stable,andcorrectwithoutidletravel

Directionoftheswitch

Inlinewiththeregulatingmechanism,markedclearly

Travel

Matchingthecontrolvalve

Positionofhightemperature

Equippedwiththermalcompensationdevice

2.6.3SolenoidValve

ThetechnicalrequirementsfortheconstructionofthesolenoidvalvesshallbecompliedwiththeTable19.

Table19

Item

TechnicalRequirements

Installation

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Directionoftheinlet/outlet

Correctandclearlymarked

Fixation

Firmandright

Tightness

Noleakage

Airtubingconnectionorwiring

Noleakage,correct

Explosion-proofclassification

Conformedtothedesignrequirements

2.7 LayingofPowerLinesforInstrumentation

2.7.1BusTray

ThetechnicalrequirementsfortheconstructionofthebustraysshallbecompliedwiththeTable20.

Table20

Item

TechnicalRequirements

Check-up

Appearance

Nodistortionaldeformationandingoodshape

Specification

Conformedtothedesignrequirements

Galvanizedcoatingorpainting

Intact

Position

Conformedtothedesignrequirements

Installation

Horizontalinclination

Permeter

Allowabledeviationpermeter2mm

Totallengthbeingmorethan5m

Allowabledeviationpermeter10mm

Verticality

Permeter

Allowabledeviationpermeter2mm

Totallengthbeingmorethan5m

Allowabledeviationpermeter10mm

Turning

Thereshallbenorightangleattheinnerside.Wheninrows,theradianshallbeconsistent.

Compensationdevice

Whenthestraightrunexceeds50m,thereshallbethermalexpansioncompensationdevice.

Connectionofbus-bartroughswithdifferentwidth(height)

Thetransitionshallbegradual.

Joint

Thereshallbenointerlacededge.

Installationofthecoverboard

Firmandconvenientfordisassembling

Fixation

Bolt

Thenutshallbeatoutersideofthetray.

Welding

Firmwithoutdistortion

2.7.2ProtectingTubesoftheWire(Cable)

Thetechnicalrequirementsfortheconstructionoftheprotectingtubesofthewire(cable)shallbecompliedwiththeTable21.

Table21

Item

TechnicalRequirements

Fabrication

Material,modelandspecification

Conformedtothedesignrequirements

Bendingradius(r)

Notarmored

r≥6D

Armored

r≥10D

Bentangle(θ)

θ≥90°

Surfaceofthebend

Nocrackorindentation

Numberoftherightanglesofasingletube

Notmorethantwo

Smoothnessofthenozzle

Smoothwithoutburr

Laying

Layingthroughhightemperaturezone

Theheatinsulationmeasureshallbeadopted.

Extensionoutofthewallwhengoingthroughwalls(L1)

L1≥30mm

Height(h)oftheprotectingtubeextendedabovethefloor(platform)

H≥1m

Distanceofthenozzlefromtheequipment(L2)

L2＝200－300mm

Layinginrows

Height

Consistent

Bendingradian

Consistent

Arrangement

Beingflushhorizontally,straightverticallyandthearrangementshallbetidy.

Connectionofcommontubes

Firm

Connectionofexplosion-prooftubes

FirmandconformedtorelatedregulationsinGB50257-96

Spacingbetweenthesupportclips

Uniform

Fixation

Firm

Protection

Thereshallbecorrosionpreventionandprotectionprovisions.

2.8 SeparateTestingandCalibrationofInstruments

2.8.1 GeneralSpecification

2.8.1.1 Theinstrumentsusedathighpressure,negativepressure,hightemperature,flammable,explosive,poisonous,noxiousmediaandforkeyprocessparametersaswellasmeteringandalarminstrumentsmustbecheckeduptotally.

2.8.1.2 Spottestatrateof30%shallbemadefortheinstrumentsusedforinnoxiousmediaatlow,mediumpressureandnormaltemperatureaccordingtotheirsystemandservices,atleastonesystemoronepieceofinstrumentshallbetestedasminimum.

2.8.2 PointerInstruments

ThetechnicalrequirementsforseparatetestandcalibrationofpointerinstrumentsshallbecompliedwiththeTable22.

Table22

Item

TechnicalRequirements

Check-up

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Appearance

Ingoodshape,intact

Zeroreset

Flexible,havingenoughregulatingwidth

Insulationresistance

Conformedtotheproductspecifications

Correctingvalueofliquidcolumn

Correct

Test&Calibration

Balanceofthemovingparts

Thechangeofthepointervalueshallnotbemorethantheabsolutevalueofallowablebasicerror.

Basicerrorvalue

Conformedtotheproductspecifications

Returndifferencevalue

Conformedtotheproductspecifications

Motionofthepointer

Smoothandstable,withoutbouncingorblocking

Actionofsignals

Deviationofalarmingvalue

Conformedtotheproductspecifications

Givenpointermotion

Freeandreliable

On/offofthecontact

Normal

Calibrationrecord

Thewritingshallbelegible,thedatashallbeaccurate,theitemsshallbecompleteandtheresponsibilityshallbeclear.

2.8.3RecordingInstrument

ThetechnicalrequirementsfortheseparatetestofrecordinginstrumentsshallbecompliedwiththeTable23.

Table23

Item

TechnicalRequirements

Check-up

Modelandspecification

Conformedtothedesignrequirements

Itemnumber

Conformedtothedesignrequirements

Appearance

Ingoodshapeandintact

Movementofpointer

Freeandstable

Insulationresistance

Conformedtothespecificationsoftheproduct

Test&Calibration

Printingrecord

Symbolandwritingshallbeclear.

Markingrecord

Thelineshallbeuniformandclear.

Recordingpapermovingandspeed

Smoothandstable,withoutbouncingorblocking;Conformedtotheproductspecifications

Durationofthepointergoingthroughthetotaltravel

Conformedtotheproductspecifications

Basicerroroftheindicatedvalue

Conformedtotheproductspecifications

Theerrorvalueoftherecord

Conformedtotheproductspecifications

Returndifferencevalue

Conformedtotheproductspecifications

Item

TechnicalRequirements

Test&