Filter
Top Products
Operation
MarathonSeriesFA/FR 31
Figure27:DeadbandExample
6.2.11AmbientBackgroundTemperatureCompensation(FAModels)
TheFAmodeliscapableofimprovingtheaccuracyoftargettemperaturemeasurementsbytaking
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 utilizethis feature,you must
enablethe sensorwith thebackground temperature
featureviatheDataTempSoftware.
6.3InputsandOutputs
6.3.1MilliampOutput
Themilliampoutputisananalogoutputyoucanconnectdirectlytoarecordingdevice(e.g.,chart
recorder),PLC, orcontroller. Theanalogoutput resolutionfor all modelsis 0.5°Cor 1°F. ThemA
outputcanbeforcedtoaspecificvalue,underrange,oroverrangewitha2‐wayRS485command.
Thisfeatureisusefulfortestingorcalibratingconnectedequipment.
6.3.2RelayOutputs
Therelayoutputisusedasanalarmforfailsafeconditionsorasasetpointrelay,refertosection10.2
Fail‐Safe Operation,p.46. Relayoutputs relatetothe currentlydisplayedtemperatureonthe LED
display.Therelayoutput canbeusedtoindicateanalarmstateortocontrolexternalactions.The
relay can be set to either NO (Normally Open) or NC (Normally Closed) with a 2‐ way RS485
command(dependingon
thecompatibilityrequirementsofconnectedequipment).Therelaycanbe
forcedonoroffviathe2‐wayfortestingconnectedequipment.
6.3.3Trigger
Peak Holdand Valley Hold canbe Reset byshorting theTrigger input(labeled TRIG) to Ground
(labeledGND)foraminimumof10msec.Thiscanbedoneeitherwithamomentaryswitchorarelay.
BothPeakHoldandValleyHoldhavetobesetto300.0secondsto
recognizethi sReset.TheReset
signalwillcausethepeakorvalleyreadingthatthesensorisholdingtochangeimmediatelytothe
currenttargettemperature.
962°C
958°C
Setpoint: 960°C
Relay Changes State
Time
Normal State Alarm Alarm Normal State
Deadband
Object Temperature