dmt143英文手册模板

dmt143英文手册

VaisalaDRYCAP®DMT143DewpointTransmitter–EnglishUserManual(CoreContent)

Thisisthecondensedcoremanualfor

VaisalaDMT143/DMT143L

miniaturedewpointtransmitters(OEM/industrialuse),basedonofficialuserguide

M211435EN-D.

1.ProductOverview

1.1BasicInfo

Model:DMT143(standard),DMT143L(longprobe)

Technology:VaisalaDRYCAP®polymersensorwithautocalibration

Purpose:Dewpoint/moisturemeasurementingases(air,N₂,H₂,O₂,Ar,He,etc.)

Applications:Compressedairdryers,gloveboxes,plasticdryers,3Dprinting,semiconductor,pharmaceutical

1.2KeyFeatures

Dewpointrange:

-70…+60°Td

(-94…+140°F)

Accuracy:

±2°Td

(±3.6°F)inair/N₂

Pressure:

0…50bara(725psia)

(absolute)

Operatingtemp:

-40…+60°C

(-40…+140°F)

Sensorwithstandscondensation&recoversfully

Resistanttoparticulates,oilvapor,mostchemicals

Looppowered(4–20mA)orvoltage/RS485outputs

OptionalLEDalarm;configurableviaDM70handheldorVaisalaInsightPCsoftware

2.TechnicalSpecifications(Summary)

2.1MeasurementPerformance

表格

Parameter

Value

Dewpointrange

-70…+60°Td(standard)

Accuracy(air/N₂)

±2°Td

Responsetime(63%/90%)

~2s/~6s(-60→-20°Td,20°C,1bar)

Pressurerange

0…50bara(725psia)

Pressurecompensation

Builtin

Longtermstability

≤0.5°Td/year

2.2Electrical

Power:

4–20mA:

18…28VDC

Voltage/RS485:

12…28VDC

Outputs

(factoryconfigurable):

4–20mA(scalable,3.6mA=error)

0–1V,0–5V,1–5V

RS485(ModbusRTU)

Alarm:RedLED(dewpointthreshold)

2.3Mechanical

Processconnection:

DMT143:G1/2"ISO228/1or1/2"NPT

DMT143L:Longerprobe(samethreads)

Probematerial:Stainlesssteel(316L)

Protection:IP66,EMCEN613261

Weight:~100g(3.5oz)

3.Installation

3.1Mounting

Removeyellowtransportcapfromsensor.

UseG1/2"Tfittingorsamplingcell(DMT242SC,DSC74,etc.).

ForISOthread:usesuppliedsealingring;forNPT:usethreadsealant(noPTFEtapeonsensorthreads).

Install

vertically

(sensordown)toavoidcondensationpooling.

Maxpressure:50bara;maxgastemp:+60°C(coolhightempgasto≤60°Cbeforemeasurement).

3.2Sampling(ProcessGas)

UseVaisalasamplingcells(DMT242SC,DSC74)forinlineinstallation.

Flowrate:0.1…10L/min;instrumentisflowinsensitive.

Avoidliquidwater;usefiltersifneeded(sinteredstainlesssteel).

3.3Wiring(4–20mAExample)

+(Terminal1):18–28VDCpositive

-(Terminal2):4–20mAsignaltoPLC/controller

Shield:Connecttogroundatcontrolsideonly

RS485:TerminalsA/B;usetwistedpaircable

4.Configuration&Calibration

4.1SetupTools

DM70HandheldMeter:Connectviacable(219980SP)toread/setparameters.

VaisalaInsightPCSoftware:USBconnection(cable219690)forfullconfiguration.

Factorydefaults:4–20mA=-60…+60°Td;alarmat+20°Td.

4.2KeySettings(viaDM70/Insight)

Dewpointrangescaling:Freescaling(e.g.,-80…+20°Td).

Alarmthreshold:SetTdlimit;LEDlightswhenexceeded.

Pressureunit:bara/psia;autocompensationenabled.

Outputtype:Select4–20mA,voltage,orRS485.

4.3Calibration

Factorycalibration:NISTtraceablecertificateincluded.

Fieldcalibration:UseDM70orreferencestandard;autocalibrationmaintainsstabilitybetweenservices.

Recommendedinterval:12months(orperprocessrequirements).

5.Operation&Maintenance

5.1Startup

Applypower;LEDblinksduringinitialization(~30s).

Stablereadingin~1–2minutes(fastresponse).

LED:

Off:Normaloperation

On:Alarm(dewpoint>threshold)

Blinking:Error(sensor,power,orcommunication)

5.2Maintenance

Cleaning:Wipeprobewithdrycloth;avoidsolvents.

Filterreplacement:Replacesinteredfilter(DRW010335SP)ifclogged.

Sensorpurge:Optionalfunction(viasoftware)forharshenvironments.

Noperiodicadjustmentneeded

(autocalibration).

6.Troubleshooting

表格

Symptom

PossibleCause

Action

Nooutput/3.6mA

Powerfailure;wiringerror;sensorerror

Checkpower/polarity;restart;inspectsensor

Unstablereading

Condensation;highflowturbulence;electricalnoise

Improvesamp