Emerson Micro Motion 9739 MVD

Troubleshooting
Table10-3Flowproblemsandrecommendedactions continued
ProblemPossiblecausesRecommendedactions
Erraticnon-zeroow
ratewhenowis
steady
•Slugow
•Dampingvaluetoolow
•Pluggedowtube
•Excessiveorerraticdrivegain
•Outputwiringproblem
•Problemwithreceivingdevice
•Wiringproblem
•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.
•ContactMicroMotion.
Inaccurateowrate
orbatchtotal
•Badowcalibrationfactor
•Inappropriatemeasurementunit
•Badsensorzero
•Baddensitycalibrationfactors
•Badowmetergrounding
•Slugow
•Problemwithreceivingdevice
•Wiringproblem
•Verifycharacterizationparameters.
•Verifythatthemeasurementunitsare
conguredcorrectlyforyourapplication.
•Zerothemeter.
•Checkgrounding.SeeSection10.11.
•Checkforslugow.SeeSection10.24.
•Verifythatthereceivingdevice,andthe
wiringbetweenthetransmitterandthe
receivingdevice
•Checkthewiringbetweenthesensorand
transmitter.SeeSection10.10.
186
MicroMotion9739MVDTransmitters