RayTek FA, FR Operation , MarathonSeriesFA/FR31

Operation MarathonSeriesFA/FR31

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Figure27:DeadbandExample

TheFAmodeliscapableofimprovingtheaccuracyoftargettemperaturemeasurementsbytaking

intoaccounttheambient,orbackground,temperature.Thisfeatureisusefulwhenthetarget

emissivityisbelow1.0andthebackgroundtemperatureisnotsignificantlylowerthanthetarget

temperature.Toutilizethisfeature,youmustenablethesensorwiththebackgroundtemperature

featureviatheDataTempSoftware.

Themilliampoutputisananalogoutputyoucanconnectdirectlytoarecordingdevice(e.g.,chart

recorder),PLC,orcontroller.Theanalogoutputresolutionforallmodelsis0.5°Cor1°F.ThemA

outputcanbeforcedtoaspecificvalue,underrange,oroverrangewitha2‐wayRS485command.

Thisfeatureisusefulfortestingorcalibratingconnectedequipment.

Therelayoutputisusedasanalarmforfailsafeconditionsorasasetpointrelay,refertosection10.2

Fail‐SafeOperation,p.46.RelayoutputsrelatetothecurrentlydisplayedtemperatureontheLED

display.Therelayoutputcanbeusedtoindicateanalarmstateortocontrolexternalactions.The

relaycanbesettoeitherNO(NormallyOpen)orNC(NormallyClosed)witha2‐ wayRS485

command(dependingonthecompatibilityrequirementsofconnectedequipment).Therelaycanbe

forcedonoroffviathe2‐wayfortestingconnectedequipment.

PeakHoldandValleyHoldcanbeResetbyshortingtheTriggerinput(labeledTRIG)toGround

(labeledGND)foraminimumof10msec.Thiscanbedoneeitherwithamomentaryswitchorarelay.

BothPeakHoldandValleyHoldhavetobesetto300.0secondstorecognizethisReset.TheReset

signalwillcausethepeakorvalleyreadingthatthesensorisholdingtochangeimmediatelytothe

currenttargettemperature.

962°C

958°C

Setpoint: 960°C

Relay Changes State

Time

Normal State Alarm Alarm Normal State

Deadband

Object Temperature