Operation
Manual
Raytek
CM
6
4.5 Electrical Interference
To minimize electrical or electromagnetic interference, follow these precautions:
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Mount the sensor as far away as possible from possible sources of interference such as motorized equipment
producing large step load changes.
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Ensure a fully insulated installation of the sensor (Avoid ground loops!).
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Make sure the shield wire in the sensor cable is earth grounded at one location.
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Don’t connect 24V power wire directly to the power network to avoid possible noise effect from it.
4.6 Emissivity of Target Object
Determine the emissivity of the target object as described in appendix 10.1 Determination of Emissivity on
page 19. 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.
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