5Operating manual – Pyrometer TP7 EN
Further setting options
By use of the Mode key (3) you can access the extended choice
of settings. Alarm thresholds and temperature units can be
selected here, for instance.
1. Press the Mode key (3) several times to reach the desired
setting:
You can adjust the respectively selected setting by use of the
Laser button (4) (up) or the Lamp button (2) (down).
Note:
With activated continuous measurement it is not possible to
switch the background illumination or the laser beam on and off.
Select the corresponding setting before activating continuous
measurement.
Example:
1. Press the Mode key (3) once.
– Extended setting mode will be started.
– The Degree of emission indication (13) flashes.
– The value can be adjusted upwards using the Laser
button (4).
– The value can be adjusted downwards using the Lamp
button (2).
– The value range is between 1.00 and 0.00.
The device measures the temperature by means of an infrared
sensor. Important factors playing a role in the temperature
measurement are the measuring spot diameter and the degree of
emission.
Measuring spot
Observe the ratio of the distance (D) to the measuring spot
diameter (S). The larger the distance to the object, the larger the
measuring spot diameter and hence, the less precise the
measured result. The device calculates an average temperature
from all the temperatures in the measuring spot.
Degree of emission
The degree of emission is used to describe the energy radiation
characteristics of a material.
A material's degree of emission depends on various factors:
• material composition,
• surface condition,
• temperature.
The degree of emission can be between 0.1 and 1 (in theory).
The following rule of thumb can be assumed:
• When a material is rather dark and its surface texture matt, it
probably has a high degree of emission.
• The brighter and smoother the surface of a material, the lower
will be its degree of emission, presumably.
• The higher the degree of emission of the surface to be
measured, the better it is suited for non-contact temperature
measurement by use of a pyrometer or thermal imaging
camera, since falsifying temperature reflections become
negligible.
Entering a degree of emission as accurate as possible is
indispensable for a precise measurement.
Most organic materials have a degree of emission of 0.95. Metals
or shiny materials come with a much lower value.
Degree of emission table
Number Menu option
1 x Setting the degree of emission
2 x Activating continuous measurement
3 x Enabling/disabling the upper alarm threshold
4 x Entering the upper alarm threshold
5 x Enabling/disabling the lower alarm threshold
6 x Entering the lower alarm threshold
Measuring principle
Material Degree of emission
Aluminium, roughened 0.1 to 0.3
Aluminium, alloy A3003, oxidized 0.3
Aluminium, oxidized 0.2 to 0.4
Asbestos 0.92 to 0.95
Tarmac 0.92 to 0.95
Basalt 0.7
Concrete 0.92 to 0.95
Bitumen 0.98 to 1.00
Lead, oxidized 0.2 to 0.6
Lead, rough 0.4
Roofing felt 0.95
Ice 0.98
Iron (forged), blunt 0.9
Iron, oxidized 0.5 to 0.9
Iron, rusted 0.5 to 0.7
Enamel varnish, black 0.95
Earth 0.92 to 0.96
Paint (not alkaline) 0.90 to 0.95
D:S = 30:1 ø25.4 mm
@ 762 mm
ø50.8 mm
@ 1524 mm
ø1.0 in
@ 30 in
ø2.0 in
@ 60 in
Laser
Infrared
D
S
