Greyline Instruments SLT32 - Wiring Problems and Non-Linearity

C -through4-20mAoutputcable -useshieldedtwistedpair(shieldedtoAC
ground)
-usegroundedmetalconduit
C -wiringorinstallationcloseto
variablespeeddriveorinverter
-followV.S.D.manufacturer’sinstructions
forDrivegrounding,wiringandshielding
UnitReceivesNoReturnEchoDueTo:
C,F,E -foamonliquidsurface -usestillingwell(openchannelflow)
B -targetbeyond MaxRg -recalibrate
E -calibrationerror - ISBNo
selectedin SPECIALFUNCTIONS
andinstrumenthasanoptionalISB
F -sensordamaged -removesensorfrommountingandaimata
flat,stabletargettotest
WiringProblemsDueToSensorCable:
A,C,F, -opencircuit -checkconnections/continuity(8850to
12700ohmsmax./-30°Cto+70°C)
B,F -shortcircuit -checkconnections/continuity(8850ohms
min.)
F -toolong(max500ft.,150m)
C -bundled/runinconduitwithpower
cable
C -sensorgroundshortedto
conduit/enclosure
-insulate
A -extendedwithwrongtypeofwire -useRG62A/Ucoaxialonly
C -closetohighvoltage/largemotors
C -ACchassis/groundmissingon
instrumentpowerconnections
Non-LinearityDueTo:
H -vapour -dissipatefumes,Calibrationin-situ
H -zeronotsetaccurately -see“ZeroPositioningofSensor”
H -wrongflume,orK&nselected
(FLOW mode)
-selectcorrectflume
D,E -calibrationerror - ISBYes
selectedin SPECIAL
FUNCTIONS menuandinstrumentdoesnot
haveanISB
SLT32Level&FlowMonitor
ManualSeriesB.11
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