11. Information on infrared (IR) measurement
17
11. Information on infrared (IR)
measurement
11.1 Measuring method
IR measurement is a visual measurement
Keep lens clean.
Do not carry out measurement with a foggy lens.
Keep the measuring range (the range between the instrument
and the measurement object) free of obstacles. There must be
no particles of dust or dirt, no humidity (rain, steam) and no
gases.
IR measurement is a surface measurement
If there is dirt, dust, frost, etc. on the surface, only the outermost
layer is measured, i.e. the dirt.
For vacuum-packed food, do not measure at air pockets.
Where the values are critical, always measure separately with
a contact thermometer. Particularly in the food sector: measure
core temperature with a penetration/immersion thermometer.
Adjustment time
If the ambient temperature changes (change of location,
e.g. measurement indoors/outdoors), the instrument must be
allowed to equalise for 15 minutes for infrared measurement.
11.2 Emissivity
Materials have different emission levels. This means they emit
various amounts of electromagnetic radiation. The emission level
of the instrument has a default setting of 0.95. This is ideal for the
measurement of food, non-metals (paper, ceramic, gypsum,
wood, paints and varnishes) and plastics.
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