Velleman DVM105 - Manual (Page 5)

DVM105
00 (30/06/2008)
5
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The infrared thermometer is supplied with a default emissivity of
0.95. The emissivity of the thermometer can be changed from 0.05
(5E) to 1 (100E). Changes should only be carried out by
experienced personnel. To change the emissivity, turn the
instrument on by pressing the Meas. Button (3), then press the
Mode button (4) five times for emissivity function. The current
setting is shown on the LCD screen. Press the Meas. Button (3) to
adjust the emissivity value, press the Mode button (4) again to exit
the set up screen. For information relating to the emissivity of
specific materials, please contact the nearest retailer.
Note: non-contact infrared thermometers are not recommended for
measuring the temperature of shiny or polished metals. See table
below for a short overview of emissivity values.
Substance Emissivity Substance Emissivity
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Leather 0.95 to 1.00
Sand 0.90 Charcoal (powder) 0.96
Earth 0.92 to 0.96 Lacquer 0.80 to 0.95
Water 0.92 to 0.96 Lacquer (matt) 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 Timber 0.90
Ceramic 0.90 to 0.94 Paper 0.70 to 0.94
Marble 0.94 Chromium oxides 0.81
Plaster 0.80 to 0.90 Copper oxides 0.78
Mortar 0.89 to 0.91 Iron oxides 0.78 to 0.82
Brick 0.93 to 0.96 Textiles 0.90
1.6.
Troubleshooting
‘Hi’ or ’Lo’ is displayed when the temperature being
measured is outside of the range of the instrument, ‘Hi’
when higher than +220°C (428°F) and ‘Lo’ when lower
than –33°C (-27°F).