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Basics
3.4 Atmospheric Quality
In order to prevent damage to the lens and erroneous readings, the lens should always be protected
from dust, smoke, fumes, and other contaminants. For this purpose an air purge collar is available. You
should only use oil free, clean "instrument" air.
3.5 Electrical Interference
To minimize electrical or electromagnetic interference, follow these precautions:
Mount the sensor as far away as possible from possible sources of interference such as
motorized equipment producing large step load changes.
Ensure a fully insulated installation of the sensor (Avoid ground loops!).
Make sure the shield wire in the sensor cable is earth grounded at one location.
3.6 Emissivity of Target Object
Determine the emissivity of the target object as described in appendix 9.1
on page 42. 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 reflecting surfaces and very thin
materials such as plastic films and glass.
This measuring error when measuring objects with low emissivity can be reduced to a minimum if
particular care is taken during installation, and the sensing head is shielded from these reflecting
radiation sources.
14
info@Raytek-Direct.com
Rev. O7 07/2017
Determination of Emissivity
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