THT32
EN - 9
5.2 GENERAL MENU DESCRIPTION
By pressing the
Menu/
key, the instrument shows the following general menu, which
allows accessing the internal functions:
Fig. 5: Instrument general menu
5.2.1 Menu
EMS
In this section, it is possible to set the values of parameter
Emissivity
of the material of
the object to be measured. In order to carry out accurate temperature measurements, it is
important to define the correct emissivity value (
), which represents the ability of a body to
emit infrared radiation, according to the kind of material the measured object is made of.
Table 1 shows the emissivity values for the most common materials. Emissivity takes
values between 0 (mirror or perfectly reflecting surface) and 1 (perfectly radiating black
body). Most of the painted or oxydized surfaces have an emissivity value of approximately
0.95.
Material Emissivity
Water 0.96
Stainless steel
0.14
Aluminium foil
0.09
Asphalt 0.96
Cement 0.97
Cast iron
0.81
Rubber 0.95
Wood 0.85
Bricks 0.75
Tape 0.96
Brass foil
0.06
Human skin
0.98
PVC plastic
0.93
Polycarbonate 0.80
Oxydized Copper
0.78
Rust 0.80
Paint 0.90
Earth 0.93
Table 1: Emissivity values of typical materials
