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RayTek 54301 Thermometer User Manual

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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

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