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SensorLocation
MarathonSeriesFA/FR 13
4SensorLocation
Sensorlocationandconfigurationdependsontheapplication.Beforedecidingonalocation,youneed
to be aware of the ambient temperature of the location, the atmospheric quality of the location
(especiallyfor1‐colortemperaturemeasurements),and thepossibleelectromagneticinterferencein
thatlocation(aconsiderationonlyfortheelectronics
enclosure).If youplantouseairpurging,you
needtohaveanairconnectionavailable.Also,wiringandconduitrunsmustbeconsidered,including
computerwiringandconnections,ifused.Thefollowingsubsectionscovertopicstoconsiderbefore
youinstallthesensor.
4.1AmbientTemperature
Theopticalheadisdesignedtooperateinambienttemperaturesupto200°C(390°F).Theelectronics
enclosureis designedtooperateinambienttemperaturesbetween0°C(32°F)and60°C(140°F).The
internalambienttemperaturecanvaryfrom10°C(50°F)to68°C(154°F).Internaltemperaturesoutside
thisrangewillcauseafailsafe
error.
4.2AtmosphericQuality
Smoke, fumes, dust,and othercontaminants inthe air,as well asa dirty lens are generally nota
problemwhenusing the2‐colormode(as longastheattenuationis equalinbothspectralbands).
However,ifthelensgetstoodirty,itcannotdetectenoughinfraredenergyto
measureaccurately,and
theinstrumentwillindicateafailure.Itisgoodpracticetoalwayskeepthelensclean.TheAirPurge
Collarhelpskeepcontaminantsfrombuildinguponthelens.Ifyouuseairpurging,makesureanair
supplywiththecorrectairpressureisinstalledbefore
proceedingwiththesensorinstallation.
4.3ElectricalInterference
Tominimizeelectricalorelectromagneticinterferenceor“noise”beawareofthefollowing:
• Mounttheelectronicsenclosureasfarawayaspossiblefrompotentialsourcesofelectrical
interferencesuchasmotorizedequipmentproducinglargesteploadchanges.
• Useshieldedwireforallinputandoutputconnections.
• Makesurethe
shieldwirefromtheelectronicstoterminalblockcableisearthgrounded.
• Foradditionalprotection,useconduitfortheexternalconnections.Solidconduitisbetterthan
flexibleconduitinhighnoiseenvironments.
• DonotrunACpowerforotherequipmentinthesameconduit.
When installing the optical head, check for any high‐intensity discharge lamps or
heaters that may be in the field of view (either background or reflected on a shiny
target)!Reflectedheatsourcescancauseasensortogiveerroneousreadings.
4.4DistancetoObject
The requested spot size determines the maximum distance to the measurment object and the
necessaryfocusoftheoptic.TheStandardFocusissetatinfinity.TheCloseFocusopticalheadsare
focusedat100mm(4in)or300mm(12in),seesection
3.5OpticalSpecifications,p.9.