Basics
12 MI
4.2EmissivityofTargetObject
Todetermine theemissivityofthetargetobjectreferto section12.1
Determination of Emissivity on page 81. If emissivity is low,
measured results could be falsifie d by interferinginfrared radiation
from background objects (such as heating systems, flames, fire clay
bricks, etc. close beside or behind the target object). This type of
problemcanoccurwhenmeasuringreflectivesurfa cesandverythin
materialssuchasplastic
filmsandglass.
Thismeasurement error can be reduced to a minimum if particular
care is taken during installation, and the sensing head is shielded
fromthesereflectingradiationsources.
4.3AmbientTemperature
The sensing head was developed for the following ambient
temperatureranges:
• MIH:0to180°C(32to356°F)
• MIC: 0to125°C(32to257°F)
• MID:0to85°C(32to185°F)
The MID can operate in ambient temperatures up to 200°C (392°F)
withtheair‐coolingaccessory.
4.4AtmosphericQuality
If the lens gets dirty, infrared energy will be blocked and the
instrumentwillnotmeasureaccurately.Itisgoodpracticetoalways
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
installedbeforeproceedingwiththesensor installation.
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