136. Setting instrument
6.3 Degree of emission
Materials have different degrees of emission, i.e. they produce different quanti-
ties of electromagnetic radiation. The degree of emission of the testo 845 is set
at 0.95 ex-works. This is optimal for measurements of non-metals, plastics and
food (paper, ceramics, plaster, wood, paints and lacquers).
Because of their low or inconsistent degrees of emission, bright metals and
metal oxides have only limited suitability for IR measurements.
Apply emission-enhancing coatings such as paint or emission adhesive tape
(Order No. 0554 0051) to the object to be measured. If this is not possible,
measure with a contact thermometer.
Degree of emission table for important materials (typical values)
6.4 Storing measurement protocols
To store a measurement protocol, the button must be pressed. The instru-
ment can be in measurement or HOLD mode. The main value continues to be
displayed during storage. The current protocol number is displayed in the lower
line. The storage symbol +M is additionally displayed. 90 measurement proto-
cols can be displayed.
Material (Temperature) ε
Cooling element, black anodized (50°C) 0,98
Copper, slightly oxidized (20°C) 0,04
Copper, oxidized (130°C) 0,76
Plastics: PE, PP, PVC (20°C) 0,94
Brass, oxidized (200°C) 0,61
Paper (20°C) 0,97
Porcelain (20°C) 0,92
Black paint, matt (80°C) 0,97
Steel, heat-treated surface (200°C) 0,52
Steel, oxidized (200°C) 0,79
Clay, fired (70°C) 0,91
Transformer lacquer (70°C) 0,94
Bricks, mortar, plaster (20°C) 0,93
Material (Temperature) ε
Aluminium, bright rolled (170°C) 0,04
Cotton (20°C) 0,77
Concrete (25°C) 0,93
Ice, smooth (0°C) 0,97
Iron, sanded (20)°C 0,24
Iron with casting skin (100°C) 0,80
Iron with rolling skin (20°C) 0,77
Plaster (20°C) 0,90
Glass (90°C) 0,94
Rubber, hard (23°C) 0,94
Rubber, soft grey (23°C) 0,89
Wood (70°C) 0,94
Cork (20°C) 0,70
To Next Page
Loading...
