Wabtec Nieaf-Smitt EazyIR, Manual

Page: 25 / 72

Nieaf-Smitt is a brand name of Mors Smitt
25
www.nieaf-smitt.com
Emissivity (EMS)
The emissivity of the surface of a material is its effectiveness in emitting
energy as thermal radiation. Quantitatively, emissivity is the ratio of the
thermal radiation from a surface to the radiation from an ideal black
surface at the same temperature as given by the Stefan–Boltzmann law.
Refer to the Table 2 for the Emissivity adjustment. Nominal Surface
Emissivity for an accurate non-contact infrared temperature measure-
ment.
Table 2: Nominal surface emissivity
Material Value Material Value
Default**** 0.95 Iron 0.70
Aluminium* 0.30 Led* 0.50
Asbestos 0.95 Oil 0.94
Aspfalt 0.95 Paint 0.93
Brass* 0.50 Plastic ** 0.95
Ceramic 0.95 Rubber 0.95
Concrete 0.95 Sand 0.90
Copper* 0.60 Steel* 0.80
Food - frozen 0.90 Water 0.93
Food - hot 0.93 Wood *** 0.94
Glass (plate) 0.85
* Oxidized
** Opaque, over 20 mils
*** Natural
****Factory Setting