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Emissivity
The emissivity refers to the ability of objects to emit
energy.
Most of the organic materials as well as painted
and oxidised surfaces have an emissivity of 0.95
(pre-set for the device).
Temperature measurements on metallic bright or
polished surfaces produce inaccurate values. To
compensate this effect, the surface to be measured
can be covered with adhesive tape or with matt
black paint.
Wait until the adhesive tape has the same tempera-
ture as the material below. Determine the tempera-
ture of the adhesive tape or the painted surface.
Emissivity table (ε)
Material
Emissivity
Asphalt
0.90 - 0.98
Con-
0.94
crete
Cement
0.96
Sand
0.90
Earth
0.92 - 0.96
Water
0.92 - 0.96
Ice
0.96 - 0.98
Snow
0.83
Glass
0.90 - 0.95
Ceramic
0.90 - 0.94
material
Marble
0.94
Gypsum 0.80 - 0.90
Mortar
0.89 - 0.91
Stone
0.93 - 0.96
14
Material
Emissivity
Fabric
0.98
(black)
Skin
0.98
Leather
0.75 - 0.80
Powder
0.96
Paint
0.80 - 0.95
Paint
0.97
(matt)
Plastic
0.85 - 0.95
material
Wood
0.90
Paper
0.70 - 0.94
Chrome
0.81
oxidised
Copper
0.78
oxidised
Iron
0.78 - 0.82
oxidised
Fabric
0.90
Rubber
0.94
(black)
Measuring point and measuring distance
(fig. II)
Keep in mind that the measuring point becomes the
larger the longer the distance to the instrument is.
Consequently the measured area becomes larger.
The ratio of the measuring distance to the measuring
point is illustrated in fig. II.
The focus for the device is 914 mm (36 ").
Temperature measurement
‰ Hold the device by its handle (1) and aim it on
the surface to be measured.
‰ Press the actuator (4) and keep it pressed to
switch on the device and to test it.
The LCD (4) illuminates if the battery is OK.
Exchange the battery if the display does not
illuminate.
‰ Release the actuator (4). The message HOLD
(10) is displayed on the LCD indicating that the
data are being held on the display.
‰ Press the UP key (19) in the HOLD mode to
switch on an off the laser.
‰ Press the down key (17) to switch on and off the
backlighting. The device switches off automati-
cally after approx. 7 seconds, if the actuator (4)
is released and the lock mode is not activated.
Note
Keep in mind when measuring:
Hold the device by the handle provided (1) and aim
it on the object surface to be measured. The ther-
mometer compensates automatically for temperature
deviations from the ambient temperature. Keep in
mind that it will take up to 30 minutes to adjust to
great temperature differences if high temperatures
have been measured. This is a result of the cooling
process necessary for the sensor.
Finding a temperature deviation
‰ To find a spot with a temperature deviation, aim
the thermometer on a spot within the area of
interest.
‰ Scan the area with an up and down motion until
you locate this spot.
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