Emerson Micro Motion 9739 MVD

Troubleshooting
Excessivedrivegain
Table10-8Possiblecausesandrecommendedactionsforexcessivedrivegain
PossiblecauseRecommendedactions
SlugowCheckforslugow.SeeSection10.24.
Pluggedowtube
•Purgetheowtubes.
•Replacethesensor.
Cavitationorashing
•Increaseinletorbackpressureatthesensor.
•Ifapumpislocatedupstreamfromthesensor,
increasethedistancebetweenthepumpand
sensor.
DriveboardormodulefailureContactMicroMotion.
CrackedowtubeContactMicroMotion.
SensorimbalanceContactMicroMotion.
Mechanicalbindingatsensor
Ensuresensorisfreetovibrate.
OpendriveorleftpickoffsensorcoilContactMicroMotion.
FlowrateoutofrangeEnsurethatowrateiswithinsensorlimits.
Incorrectsensorcharacterization
Verifycharacterizationparameters.
Erraticdrivegain
Table10-9Possiblecausesandrecommendedactionsforerraticdrivegain
PossiblecauseRecommendedactions
WrongK1characterizationconstantforsensorVerifytheK1characterizationparameter.
Polarityofpick-offreversedorpolarityofdrivereversedContactMicroMotion.
SlugowCheckforslugow.SeeSection10.24.
Foreignmaterialcaughtinowtubes
•Purgetheowtubes.
•Replacethesensor.
10.25.1Collectdrivegaindata
Prerequisites
YouwillneedeitherProLinkIIoraFieldCommunicatortocollectthedrivegaindata.
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MicroMotion9739MVDTransmitters