RayTek 54301 - page 20

Basics
4.2EmissivityofTargetObject
Todeterminetheemissivityofthetargetobjectrefertosection12.1
DeterminationofEmissivityonpage80.Ifemissivityislow,
measuredresultscouldbefalsifiedbyinterferinginfraredradiation
frombackgroundobjects(suchasheatingsystems,flames,fireclay
bricks,etc.closebesideorbehindthetargetobject).Thistypeof
problemcanoccurwhenmeasuringreflectivesurfacesandverythin
materialssuchasplasticfilmsandglass.
Thismeasurementerrorcanbereducedtoaminimumifparticular
careistakenduringinstallation,andthesensingheadisshielded
fromthesereflectingradiationsources.
4.3AmbientTemperature
Thesensingheadwasdevelopedforthefollowingambient
temperatureranges:
• MIH:0to180°C(32to356°F)
• MIC:0to125°C(32to257°F)
• MID:0to85°C(32to185°F)
TheMIDcanoperateinambienttemperaturesupto200°C(392°F)
withtheair‐coolingaccessory.
4.4AtmosphericQuality
Ifthelensgetsdirty,infraredenergywillbeblockedandthe
instrumentwillnotmeasureaccurately.Itisgoodpracticetoalways
keepthelensclean.TheAirPurgeJackethelpskeepcontaminants
frombuildinguponthelens.Ifyouuseairpurging,makesurea
filteredairsupplywithcleandryairatthecorrectairpressureis
installedbeforeproceedingwiththesensorinstallation.
12MID