Emerson Micro Motion 9739 MVD

Troubleshooting
Table10-3Flowproblemsandrecommendedactions continued
ProblemPossiblecausesRecommendedactions
Erraticnon-zeroow
rateunderno-ow
conditions
•Leakingvalveorseal
•Slugow
•Pluggedowtube
•Incorrectsensororientation
•Wiringproblem
•Vibrationinpipelineatratecloseto
sensortubefrequency
•Dampingvaluetoolow
•Mountingstressonsensor
•Sensorcross-talk
•Verifythatthesensororientationis
appropriateforyourapplication(referto
thesensorinstallationmanual).
•Checkthedrivegainandthepickoff
voltage.SeeSection10.25andSection
10.26.
•Forinstallationwith9-wirecabling,
verifythatthe9-wirecableiscorrectly
grounded.
•Checkthewiringbetweenthesensorand
transmitter.SeeSection10.10.
•Forsensorswithajunctionbox,check
formoistureinthejunctionbox.
•Purgetheowtubes.
•Checkforopenorleakingvalvesor
seals.
•Checkforsourcesofvibration.
•Verifydampingconguration.
•Verifythatthemeasurementunitsare
conguredcorrectlyforyourapplication.
•Checkforslugow.SeeSection10.24.
•Checkforradiofrequencyinterference.
SeeSection10.12.
•Iftwosensorswithsimilarfrequencyare
tooneareachother,separatethem.
•ContactMicroMotion.
ConfigurationandUseManual
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