Greyline Instruments SLT32 - Signal and Response Settings; 4-20 mA Current Loop Offset; Damping Configuration; Rejection Time (RejTime)

4-20mACURRENTLOOPOFFSET
Someapplicationsmayrequirethe4-20mAoutputtobeoffsetsothat4mAor20mAcorrespondstoa
Level,RangeorFlowotherthanZeroandFullScale.
4mAat -use Ç and È toset%outputfor4mA.Itisadjustablefrom-5%(3.8mA)upto15%lower
thanthe20mAsetting.Adjustmentresolutionis0.05%(0.01mA).
20mA at-use Ç and È toset%outputfor20mA(downto15%greaterthanthe4mAsettingandupto
300%).Adjustmentresolutionis0.05%(0.01mA).
DAMPING
Minimumdampingallowsfastresponsetolevelchanges.IncreasingdampingslowstheSLT32's
responsetolevelchangesandisidealtosmooththedisplayandoutputsinturbulentconditions.
Dampingvalueisshowninpercent(0-99%).Someexperimentationmayberequiredtoselectthe
optimumdampingvalue.Avalueof20%isrecommendedformostapplications.Forfastlevelchanges
(upto½inch/sec-13mm/sec),aDampingvalueof1%isrecommended.Maximumis99%.
IftheSLT32isunabletoobtainrepeatedechoestheDampingsettingwillbeautomaticallysetto1%by
theinstrument.
REJECTIONTIME(RejTime)
RejectionTimeadjustmentisapowerfulSLT32featuretosuppressfalseechoesandtheeffectsof
transienttargetssuchasagitators,splashing,orturbulence.RejectionTimeisshowninseconds.The
timevaluerepresentsthenumberofsecondstheSLT32mustreceiverepeatedechoesfromanewtarget
beforeindicatingitslevelonthedisplayandoutputs.Thefactorydefaultis8secondsandshouldbe
idealformostapplications.DecreasingthisvalueallowstheSLT32torespondmorequicklytofast
levelchanges,andincreasingthetimevalueallowstheSLT32torejectfalseechoesfromslowsweeping
agitators,tankfillingstreams,splashing,severeturbulenceandsteam.Minimumsettingis1second(for
fastlevelchangesupto½inch/sec-13mm/sec).Maximumsettingis85seconds.IftheSLT32is
unabletoobtainrepeatedechoestheRejTimesettingwillbeautomaticallysetto1secondbythe
instrument.
SLT32Level&FlowMonitor
ManualSeriesB.11
Page 13