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pyrometer TP7
Information about the device
Device description
The pyrometer TP7 uses an infrared sensor to measure surface
temperatures without contact. An integrated multi-laser pointer
serves for the determination of the measuring spot.
You can set the emission ratio of the material to be measured so
as to achieve a more precise measurement result.
For the temperature measurement the device allows you to set
freely definable thresholds. Exceeding or falling below these
preselected thresholds is indicated by an acoustic alarm
function and visually by a changed display colour.
The display can be illuminated as needed. When not in use, an
automatic switch-off saves the battery.
Measuring principle
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.
Ø 12 mm
@ 480 mm
Ø 48 mm
@ 1920 mm
MULTIPOINT-LASER
Distance : Spot = 40 : 1
Degree of emission
The degree of emission is used to describe the energy radiation
characteristics of a material.
Most organic materials have an emissivity of0.95. Metals or
shiny materials come with a much lower value.
A material's emissivity depends on various factors, e.g. on
Material composition
Surface condition
Temperature
The emissivity can range 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 emissivity.
The brighter and smoother the surface of a material, the
lower will be its emissivity, 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.
Nevertheless, entering a degree of emission as appropriate as
possible is indispensable for a precise measurement.
Emissivity table
The table below may be used as reference for setting the
degree of emission. It supplies reference values for the
emissivity of common materials.
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
Paint (non-metal) 0.95
Gypsum 0.60 to 0.95
Glass, pane 0.85 to 0.95
Rubber 0.92 to 0.95
Cast iron, molten 0.2 to 0.3
Cast iron, not oxidized 0.2
Skin 0.98
Haynes alloy 0.3 to 0.8
Radiator enamel 0.95
Timber (natural) 0.90 to 0.95
4


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Others manual(s) of Trotec TP7

Trotec TP7 User Manual - German - 11 pages

Trotec TP7 User Manual - Dutch - 11 pages

Trotec TP7 User Manual - French - 11 pages


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