Brookfield DV3T - Appendix L - Fault Diagnosis and Troubleshooting

Brookeld Engineering Labs., Inc. Page 121 Manual No. M13-167-A0415
Appendix L - Fault Diagnosis and Troubleshooting
ListedaresomeofthemorecommonproblemsthatyoumayencounterwhileusingyourRheometer.
❏ Spindle Does Not Rotate
✓Makesuretherheometerispluggedin.
✓Checkthevoltageratingonyourrheometer(115,220V);itmustmatchthewallvoltage.
✓MakesurethemotorisONandthedesiredrpmisselected.
❏ Spindle Wobbles When Rotating or Looks Bent
✓Makesurethespindleistightenedsecurelytotherheometercoupling.
✓Checkthestraightnessofallotherspindles;replaceifbent.
✓Inspectrheometercouplingandspindlecouplingmatingareasandthreadsfordirt;cleanthreads
onspindlecouplingwitha3/56left-handtap.
✓Inspectthreadsforwear;ifthethreadsareworn,theunitneedsservice(seeAppendixO).Check
toseeifspindlesrotateeccentricallyorwobble.Thereisanallowablerunoutof1/32-inchin
eachdirection(1/16-inchtotal)whenmeasuredfromthebottomofthespindlerotatinginair.
✓Checktoseeiftherheometercouplingappearsbent;ifso,theunitisinneedofservice(see
AppendixO:WarrantyRepairandService).
❏ Inaccurate Readings
✓Verifyspindle,speedandmodelselection.
✓VerifyspindleselectioniscorrectonDV3T.
✓ If%readingsareunder-range(lessthan10%),thedisplaywillash;changespindleand/or
speed.
✓“EEEE”onthedigitaldisplaymeanstheunitisover-range(greaterthan100%);reducespeed
and/orchangespindle.
✓ Verifytestparameters:temperature,container,volume,method.Referto:
  • “MoreSolutionstoStickyProblems”,SectionIII
  • “DV3TRheometerOperatingInstructions”,AppendixC:VariablesinViscosityMeasurements
✓Performacalibrationcheck;followtheinstructionsinAppendixF.
✓ Verifytolerancesarecalculatedcorrectly.
✓Verifythecalibrationcheckprocedureswerefollowedexactly.
Iftheunitisfoundtobeoutoftolerance,theunitmaybeinneedofservice.SeeAppendixO
fordetailsonWarrantyRepairandService.
❏ Rheometer Will Not Return to Zero
✓ Rheometerisnotlevel
  • Checkwithspindleoutofthesample.
  • Adjustthelaboratorystand.