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RayTek MI Miniature Infrared Sensor Thermometer User Manual

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Basics

12 MI

4.2EmissivityofTargetObject

Todeterminetheemissivityofthetargetobjectrefertosection12.1

Determination of Emissivity on page 81. 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.

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