Emerson Micro Motion 9739 MVD

Troubleshooting
10.4Densityproblems
Table10-4Densityproblemsandrecommendedactions
ProblemPossiblecausesRecommendedactions
Inaccuratedensity
reading
•Problemwithprocessuid
•Baddensitycalibrationfactors
•Wiringproblem
•Badowmetergrounding
•Slugow
•Sensorcross-talk
•Pluggedowtube
•Incorrectsensororientation
•RTDfailure
•Physicalcharacteristicsofsensor
havechanged
•Verifyprocessconditions.
•Verifycharacterizationparameters.
•Checkthewiringbetweenthesensorand
transmitter.SeeSection10.10.
•Checkgrounding.SeeSection10.11.
•Checkforslugow.SeeSection10.24.
•Iftwosensorswithsimilarfrequencyare
tooneareachother,separatethem.
•Purgetheowtubes.
Unusuallyhigh
densityreading
•Pluggedowtube
•IncorrectK2value
•Verifycharacterizationparameters.
•Purgetheowtubes.
•Checkforcoatingintheowtubes.
Unusuallylow
densityreading
•Slugow
•IncorrectK2value
•Verifyprocessconditions.
•Verifycharacterizationparameters.
•Checkthewiringbetweenthesensorand
transmitter.SeeSection10.10.
•Checkfortubeerosion,especiallyifthe
processuidisabrasive.
10.5Temperatureproblems
Table10-5Temperatureproblemsandrecommendedactions
ProblemPossiblecausesRecommendedactions
Temperaturereading
signicantlydifferent
fromprocess
temperature
•RTDfailure
•Wiringproblem
•Refertostatusalarms(especiallyRTD
failurealarms).
•Disableexternaltemperature
compensation.
•Verifytemperaturecalibration.
•Checkthewiringbetweenthesensor
andtransmitter.SeeSection10.10.
Temperaturereading
slightlydifferentfrom
processtemperature
•Sensorleakingheat•Performtemperaturecalibration.
ConfigurationandUseManual
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