User manual

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.