INSTRUMENTS WITH A DIGITAL SOUL

Country: United Kingdom

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AX-CP-03-R

Clip-on probe; with puncturing point; 10A; red; 4mm; Ø: 4mm

AX-155

Digital multimeter; 2x/s; VDC: 0,1m÷400m/4/40/400/1000V; 375g

AX-588B

Digital multimeter; LCD 3,5 digit 28mm; -40÷1000°C; 3V

AX-TL-4B1-R

Test lead; 1m; red; 19A; Cond.cross sec: 1mm2

AX-18B

Digital multimeter; LCD (6000) 14mm, with a backlit; 3x/s

AX-CR-4PM-BL

Crocodile clip; 15A; blue; Grip capac: max.12mm; Socket size: 4mm

AX-CP-03-B

Clip-on probe; with puncturing point; 10A; black; 4mm; Ø: 4mm

AX-TLP-TW-01

Test tweezers; 0.4m; black; Type: with protection

AX-TLP-003

Test lead; PVC; 1.2m; 10A; red and black; 2x test lead

AX-TLS-003A

Test lead; silicone; 1m; 10A; red and black

AXIOMET Catalogue

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(ver. 6)
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Emission Factor and Its Influence on the Accuracy of Temperature Measurements.

Infrared radiation, also called thermal radiation, is emitted by each body with temperature higher than 0°K. Higher temperatures mean higher incident radiation.

The capacity to emit infrared radiation differs between particular materials. Its intensity is further influenced by the surface (its color, smoothness). Dark, matt objects emit more thermal radiation in comparison to those with light, smooth surface.

In order to achieve precise results, depending on the specifics of a particular examined object, a so-called Emission Factor (ε) is used. The factor should be taken into consideration during contactless temperature measurement

The benchmark for radiation measurements is a blackbody that completely absorbs radiation, regardless of the wave length, incidence angle, or the temperature of the radiating object. Its Emission Factor (ε) equals 1.

Emission values for different materials are contained within the range 0-1.

Values for the most commonly tested objects are listed in the table below.

Material Thermal Emissivity Material Thermal Emissivity
Asphalt 0.90 to 0.98 Material (black) 0.98
Concrete 0.94 Human Skin 0.98
Cement 0.96 Leather 0.75 to 0.80
Sand 0.90 Coal (Powder) 0.96
Soil 0.92 to 0.96 Varnish 0.80 to 0.95
Water 0.92 to 0.96 Varnish (flat) 0.97
Ice 0.96 to 0.98 Rubber (black) 0.94
Snow 0.83 Plastic 0.85 to 0.95
Glass 0.90 to 0.95 Wood 0.90
Ceramics 0.90 to 0.94 Paper 0.70 to 0.94
Marble 0.94 Chromium Oxide 0.81
Plaster 0.80 to 0.90 Copper Oxide 0.78
Masonry Mortar 0.89 to 0.91 Iron Oxide 0.78 to 0.82
Brick 0.93 to 0.96 Cloth 0.90

AX-7600
AX-7600
Net price from 34.97 GBP
A pyrometer with adjustable emission factor

The instrument for contactless temperature measurement (based on infrared radiation) is called a pyrometer. Its main advantage is quick measurement that does not influence the temperature of examined objects. A pyrometer with adjustable emission factor takes its value into account when converting the received radiation into temperature displayed on the screen.

In case of basic pyrometers, the emission factor has a fixed value of 0.95, typical for the majority of materials. For measuring materials with low emissivity (like metallic, varnished, or polished surfaces), pyrometers with adjustable emission factor should be used.

Using a pyrometer, you can also conduct spot temperature measurement. In order to conduct temperature measurement and present temperature distribution on a surface, thermal-imaging cameras should be used.