Emerson Micro Motion 9739 MVD

Measurementsupport
Prerequisites
Identifythemeterfactor(s)thatyouwillcalculateandset.Youmaysetanycombinationofthethree
meterfactors:massow,volumeow,anddensity.Notethatallthreemeterfactorsareindependent:
•Themeterfactorformassowaffectsonlythevaluereportedformassow.
•Themeterfactorfordensityaffectsonlythevaluereportedfordensity.
•Themeterfactorforvolumeowaffectsonlythevaluereportedforvolumeoworgasstandard
volumeow
Important
Toadjustvolumeow,youmustsetthemeterfactorforvolumeow.Settingameterfactorformassow
andameterfactorfordensitywillnotproducethedesiredresult.Thevolumeowcalculationsarebased
onoriginalmassowanddensityvalues,beforethecorrespondingmeterfactorshavebeenapplied.
Ifyouplantocalculatethemeterfactorforvolumeow,beawarethatvalidatingvolumeintheeld
maybeexpensive,andtheproceduremaybehazardousforsomeprocessuids.Therefore,because
volumeisinverselyproportionaltodensity,analternativetodirectmeasurementistocalculatethemeter
factorforvolumeowfromthemeterfactorfordensity.SeeSection9.2.1forinstructionsonthismethod.
Obtainareferencedevice(externalmeasurementdevice)fortheappropriateprocessvariable.
Important
Forgoodresults,thereferencedevicemustbehighlyaccurate.
Procedure
1.Determinethemeterfactorasfollows:
a.Usetheowmetertotakeasamplemeasurement.
b.Measurethesamesampleusingthereferencedevice.
c.Calculatethemeterfactorusingthefollowingformula:
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MicroMotion9739MVDTransmitters